1. A powertrain system for a purely electric vehicle, the powertrain system comprising: the gear transmission mechanism comprises a first synchronizer (10), a first gear train (2), a second gear train (3), a first spindle (11), a second spindle (12), a first motor (13), a second motor (14) and a transmission assembly;

the first main shaft (11) and the second main shaft (12) are distributed at intervals in parallel, an input gear of the first gear train (2) is movably sleeved outside the first main shaft (11), an output gear of the first gear train (2) is fixedly sleeved outside the second main shaft (12), an input gear of the second gear train (3) is movably sleeved outside the first main shaft (11), an output gear of the second gear train (3) is fixedly sleeved outside the second main shaft (12), the first synchronizer (10) is sleeved outside the first main shaft (11) and is positioned between the input gear of the first gear train (2) and the input gear of the second gear train (3), and the first synchronizer (10) is used for controlling the first main shaft (11) to be in transmission connection with the input gear of the first gear train (2) or the input gear of the second gear train (3), an output shaft of the first motor (13) is coaxially connected with the first spindle (11), and a wheel (64) is in transmission connection with the second spindle (12);

the transmission assembly comprises a transmission shaft (41), a first transmission gear (42), a second transmission gear (43) and a second synchronizer (44), the first transmission gear (42) is coaxially sleeved outside the transmission shaft (41), the second transmission gear (43) is movably sleeved outside the transmission shaft (41), the transmission shafts (41) and the first main shaft (11) are distributed at intervals in parallel, the first transmission gear (42) is in transmission connection with an output shaft of the second motor (14), the second transmission gear (43) is in transmission connection with an input gear of the first gear train (2) or an input gear of the second gear train (3), the second synchronizer (44) is sleeved outside the transmission shaft (41), and the second synchronizer (44) is used for controlling the second transmission gear (43) to be connected with or disconnected from the transmission shaft (41).

2. The powertrain system of claim 1, characterized in that the transmission assembly further comprises a third transmission gear (45), the third transmission gear (45) is movably sleeved outside the transmission shaft (41), the second transmission gear (43) is in transmission connection with one of the input gears of the first gear train (2) and the second gear train (3), and the third transmission gear (45) is in transmission connection with the other one of the input gears of the first gear train (2) and the second gear train (3);

the second synchronizer (44) is positioned between the second transmission gear (43) and the third transmission gear (45), and the first synchronizer (10) is also used for controlling the third transmission gear (45) to be connected or disconnected with the transmission shaft (41).

3. A power system according to claim 1, characterized in that the power system further comprises a third gear train (5) and a one-way clutch (61), the input gear of the third gear train (5) is coaxially connected with the output shaft of the second electric machine (14), the input gear of the third gear train (5) is in transmission connection with the first transmission gear (42), the one-way clutch (61) is arranged on the second main shaft (12), and the one-way clutch (61) connects the output gear of the third gear train (5) and the second main shaft (12).

4. A power system according to any one of claims 1 to 3, characterized in that the power system further comprises a power supply assembly (7), the power supply assembly (7) comprising: a battery (71) and two inverters (72), the two inverters (72) being connected to the battery (71), respectively, the first motor (13) being connected to one of the two inverters (72), and the second motor (14) being connected to the other of the two inverters (72).

5. The power system according to any one of claims 1 to 3, characterized in that the power system further comprises a fourth transmission gear (62), the fourth transmission gear (62) is coaxially sleeved outside the second main shaft (12), and the wheel (64) is in transmission connection with the fourth transmission gear (62) through a differential (63).

6. A control method of a pure electric vehicle power system is characterized by being used for controlling the pure electric vehicle power system according to any one of claims 1 to 5 to be switched into a single-motor mode, a double-motor mode, a reverse mode and an energy recovery mode.

7. The control method according to claim 6, wherein when controlling the power system to switch to the single-motor mode, the control method includes:

controlling the first motor to work, controlling the second motor to stop, controlling the first synchronizer to enable the first spindle to be in transmission connection with an input gear of the first gear train or an input gear of the second gear train, and controlling the second synchronizer to enable the second transmission gear to be disconnected with the transmission shaft; alternatively, the first and second electrodes may be,

and controlling the first motor to stop, controlling the second motor to work, controlling the first synchronizer to enable the first spindle to be in transmission connection with the input gear of the first gear train or the input gear of the second gear train, and controlling the second synchronizer to enable the second transmission gear to be connected with the transmission shaft.

8. The control method according to claim 6, wherein when controlling the power system to switch to the single-motor mode, the control method includes:

and controlling the first motor to work, controlling the second motor to work, controlling the first synchronizer to enable the first spindle to be in transmission connection with the input gear of the first gear train or the input gear of the second gear train, and controlling the second synchronizer to enable the second transmission gear to be connected with the transmission shaft.

9. The control method system according to claim 6, wherein when the power system is controlled to be switched to the reverse mode, the control method comprises:

and controlling the first motor to rotate reversely, controlling the second motor to stop, controlling the first synchronizer to enable the first spindle to be in transmission connection with the input gear of the first gear train or the input gear of the second gear train, and controlling the second synchronizer to enable the second transmission gear to be disconnected with the transmission shaft.

10. The control method according to claim 6, wherein when controlling the power system to switch to the energy recovery mode, the control method includes:

controlling the first synchronizer to disconnect the first main shaft from the input gear of the first gear train and the input gear of the second gear train, controlling the second synchronizer to disconnect the second transmission gear from the transmission shaft, and controlling the second motor to generate power; alternatively, the first and second electrodes may be,

and controlling the first synchronizer to enable the first spindle to be in transmission connection with the input gear of the first gear train or the input gear of the second gear train, controlling the second synchronizer to enable the second transmission gear to be disconnected with the transmission shaft, and controlling the first motor to generate power.

Background

Most of the traditional automobiles use fossil fuels (such as gasoline, diesel oil and the like) to provide power for engines, and the exhaust gas of the traditional automobiles can pollute the environment. Therefore, it is very slow to use new pollution-free energy (such as electric energy) to replace fossil fuel to power automobiles, and thus new energy automobiles which are power systems of pure electric vehicles are a trend.

The related art provides a power system of a pure electric vehicle, which includes: the device comprises a first motor, a second motor, a main shaft, a synchronizer and two gear trains. The output shaft of the first motor is in transmission connection with the spindle, the input gears of the two gear trains are coaxially sleeved on the spindle, and the power connection between the spindle and the two gear trains is switched through the synchronizer, so that the first motor can be switched to different gears. And the output shaft of the second motor is also in transmission connection with the main shaft, so that the second motor and the first motor can share two gear trains to save cost.

However, when any one of the two motors of the power system works, the output power is transmitted to the other motor through the main shaft and drags the other motor to rotate, and particularly under the working condition of single motor working, more power loss is caused.

Disclosure of Invention

The embodiment of the disclosure provides a power system and a control method of a pure electric vehicle, which can avoid the problem of dragging energy consumption caused by power transmission to another motor in a single-motor mode, and improve power loss.

The technical scheme is as follows:

the embodiment of the present disclosure provides a power system of a pure electric vehicle, where the power system includes: the device comprises a first synchronizer, a first gear train, a second gear train, a first spindle, a second spindle, a first motor, a second motor and a transmission assembly; the first main shaft and the second main shaft are distributed in parallel at intervals, an input gear of the first gear train is movably sleeved outside the first main shaft, an output gear of the first gear train is fixedly sleeved outside the second main shaft, an input gear of the second gear train is movably sleeved outside the first main shaft, an output gear of the second gear train is fixedly sleeved outside the second main shaft, the first synchronizer is sleeved outside the first main shaft and is positioned between the input gear of the first gear train and the input gear of the second gear train, the first synchronizer is used for controlling the first main shaft to be in transmission connection with the input gear of the first gear train or the input gear of the second gear train, an output shaft of the first motor is in coaxial connection with the first main shaft, and wheels are in transmission connection with the second main shaft; the transmission assembly comprises a transmission shaft, a first transmission gear, a second transmission gear and a second synchronizer, the first transmission gear is coaxially sleeved outside the transmission shaft, the second transmission gear is movably sleeved outside the transmission shaft, the transmission shaft is in parallel interval distribution with a first spindle, the first transmission gear is in transmission connection with an output shaft of a second motor, the second transmission gear is in transmission connection with an input gear of a first gear train or an input gear of a second gear train, the second synchronizer is sleeved outside the transmission shaft, and the second synchronizer is used for controlling the second transmission gear to be connected with or disconnected from the transmission shaft.

In one implementation manner of the embodiment of the present disclosure, the transmission assembly further includes a third transmission gear movably sleeved outside the transmission shaft, the second transmission gear is in transmission connection with one of the input gear of the first gear train and the input gear of the second gear train, and the third transmission gear is in transmission connection with the other one of the input gear of the first gear train and the input gear of the second gear train; the second synchronizer is positioned between the second transmission gear and the third transmission gear, and the first synchronizer is also used for controlling the third transmission gear to be connected with or disconnected from the transmission shaft.

In another implementation manner of the embodiment of the present disclosure, the power system further includes a third gear train and a one-way clutch, an input gear of the third gear train is coaxially connected to an output shaft of the second motor, an input gear of the third gear train is in transmission connection with the first transmission gear, the one-way clutch is disposed on the second spindle, and the one-way clutch connects an output gear of the third gear train and the second spindle.

In another implementation of the disclosed embodiment, the power system further includes a power supply assembly, the power supply assembly including: the first motor is connected with one of the two inverters, and the second motor is connected with the other of the two inverters.

In another implementation manner of the embodiment of the present disclosure, the power system further includes a fourth transmission gear, the fourth transmission gear is coaxially sleeved outside the second main shaft, and the wheel is in transmission connection with the fourth transmission gear through a differential.

The embodiment of the disclosure provides a control method of a power system of a pure electric vehicle, and the control method is used for controlling the power system of the pure electric vehicle to be switched into a single-motor mode, a double-motor mode, a reverse mode and an energy recovery mode.

In another implementation manner of the embodiment of the present disclosure, when the power system is controlled to switch to the single-motor mode, the control method includes: controlling the first motor to work, controlling the second motor to stop, controlling the first synchronizer to enable the first spindle to be in transmission connection with an input gear of the first gear train or an input gear of the second gear train, and controlling the second synchronizer to enable the second transmission gear to be disconnected with the transmission shaft; or controlling the first motor to stop, controlling the second motor to work, controlling the first synchronizer to enable the first spindle to be in transmission connection with the input gear of the first gear train or the input gear of the second gear train, and controlling the second synchronizer to enable the second transmission gear to be connected with the transmission shaft.

In another implementation manner of the embodiment of the present disclosure, when the power system is controlled to switch to the single-motor mode, the control method includes: and controlling the first motor to work, controlling the second motor to work, controlling the first synchronizer to enable the first spindle to be in transmission connection with the input gear of the first gear train or the input gear of the second gear train, and controlling the second synchronizer to enable the second transmission gear to be connected with the transmission shaft.

In another implementation manner of the embodiment of the present disclosure, when the power system is controlled to be switched to the reverse mode, the control method includes: and controlling the first motor to rotate reversely, controlling the second motor to stop, controlling the first synchronizer to enable the first spindle to be in transmission connection with the input gear of the first gear train or the input gear of the second gear train, and controlling the second synchronizer to enable the second transmission gear to be disconnected with the transmission shaft.

In another implementation manner of the embodiment of the present disclosure, when the power system is controlled to be switched to the energy recovery mode, the control method includes: controlling the first synchronizer to disconnect the first main shaft from the input gear of the first gear train and the input gear of the second gear train, controlling the second synchronizer to disconnect the second transmission gear from the transmission shaft, and controlling the second motor to generate power; or the first synchronizer is controlled to enable the first spindle to be in transmission connection with the input gear of the first gear train or the input gear of the second gear train, the second synchronizer is controlled to enable the second transmission gear to be disconnected with the transmission shaft, and the first motor is controlled to generate power.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

in the power system of the pure electric vehicle provided by the embodiment of the disclosure, the first gear train and the second gear train are both arranged on the first spindle and the second spindle, and the first spindle and the first gear train or the second gear train are controlled to be in transmission connection through the first synchronizer, so that secondary driving of the power system is realized. The output shaft of the first motor is directly and coaxially connected with the first main shaft, namely the first motor can realize secondary driving under the switching of the first synchronizer; the output shaft of the second motor is connected to the transmission shaft of the transmission assembly through the first transmission gear of the transmission assembly, the second transmission gear in the transmission assembly can be connected with or disconnected from the transmission shaft through the second synchronizer, and the second transmission gear is in transmission connection with the first gear train or the second gear train, so that the second motor can be connected to the first gear train or the second gear train through the transmission assembly, and the two motors can share the two gear trains, so that the cost is saved.

Meanwhile, when only the first motor works, the second synchronizer in the transmission assembly can be used for disconnecting the transmission shaft from the first main shaft, so that power transmission is cut off, the power output by the first motor is prevented from being transmitted to the second motor, the second motor is prevented from being dragged to rotate, energy consumption is reduced, and the problem of power loss is solved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a power system of a pure electric vehicle according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a power system of another pure electric vehicle provided by the embodiment of the disclosure;

FIG. 3 is a schematic energy transfer diagram of a power system of a pure electric vehicle in a single-motor mode according to an embodiment of the present disclosure;

FIG. 4 is a schematic energy transfer diagram of a power system of a pure electric vehicle in a single-motor mode according to an embodiment of the present disclosure;

FIG. 5 is a schematic energy transfer diagram of a power system of a pure electric vehicle in a single-motor mode according to an embodiment of the present disclosure;

FIG. 6 is a schematic energy transfer diagram of a power system of a pure electric vehicle in a single-motor mode according to an embodiment of the present disclosure;

FIG. 7 is a schematic energy transmission diagram of a power system of a pure electric vehicle in a dual-motor mode according to an embodiment of the present disclosure;

FIG. 8 is a schematic energy transmission diagram of a power system of a pure electric vehicle in a dual-motor mode according to an embodiment of the present disclosure;

FIG. 9 is a schematic energy transmission diagram of a power system of a pure electric vehicle in a reverse mode according to an embodiment of the disclosure;

FIG. 10 is a schematic energy transmission diagram of a power system of a pure electric vehicle in an energy recovery mode according to an embodiment of the disclosure.

The various symbols in the figure are illustrated as follows:

10. a first synchronizer; 11. a first main shaft; 12. a second main shaft; 13. a first motor; 14. a second motor;

2. a first gear train; 21. an input gear of the first gear train; 22. an output gear of the first gear train;

3. a second gear train; 31. an input gear of the second gear train; 32. an output gear of the second gear train;

41. a drive shaft; 42. a first drive gear; 43. a second transmission gear; 44. a second synchronizer; 45. a third transmission gear;

5. a third gear train; 51. an input gear of the third gear train; 52. an output gear of the third gear train;

61. a one-way clutch; 62. a fourth transmission gear; 63. a differential mechanism; 64. a wheel;

7. a power supply assembly; 71. a battery; 72. an inverter.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", "top", "bottom", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.

Fig. 1 is a schematic structural diagram of a power system of a pure electric vehicle according to an embodiment of the present disclosure. As shown in fig. 1, the power system includes: the gear train comprises a first synchronizer 10, a first gear train 2, a second gear train 3, a first main shaft 11, a second main shaft 12, a first motor 13, a second motor 14 and a transmission assembly.

As shown in fig. 1, the first spindle 11 and the second spindle 12 are distributed in parallel at intervals, the input gear 21 of the first gear train 2 is movably sleeved outside the first spindle 11, the output gear 22 of the first gear train 2 is fixedly sleeved outside the second spindle 12, the input gear 31 of the second gear train 3 is movably sleeved outside the first spindle 11, the output gear 32 of the second gear train 3 is fixedly sleeved outside the second spindle 12, the first synchronizer 10 is sleeved outside the first spindle 11 and is located between the input gear 21 of the first gear train 2 and the input gear 31 of the second gear train 3, the output shaft of the first motor 13 is coaxially connected with the first spindle 11, and the wheel 64 is in transmission connection with the second spindle 12.

Wherein the first synchronizer 10 is used for controlling the first main shaft 11 to be in transmission connection with the input gear 21 of the first gear train 2 or the input gear 31 of the second gear train 3.

As shown in fig. 1, the transmission assembly includes a transmission shaft 41, a first transmission gear 42, a second transmission gear 43 and a second synchronizer 44, the first transmission gear 42 is coaxially sleeved outside the transmission shaft 41, the second transmission gear 43 is movably sleeved outside the transmission shaft 41, the transmission shaft 41 and the first spindle 11 are distributed in parallel at intervals, the first transmission gear 42 is in transmission connection with an output shaft of the second motor 14, the second transmission gear 43 is in transmission connection with the input gear 21 of the first gear train 2 or the input gear 31 of the second gear train 3, and the second synchronizer 44 is sleeved outside the transmission shaft 41.

Wherein, the second synchronizer 44 is used for controlling the connection or disconnection of the second transmission gear 43 and the transmission shaft 41.

In the power system of the pure electric vehicle provided by the embodiment of the disclosure, the first gear train 2 and the second gear train 3 are both arranged on the first spindle 11 and the second spindle 12, and the first synchronizer 10 controls the first spindle 11 to be in transmission connection with the first gear train 2 or the second gear train 3, so as to realize secondary driving of the power system. Wherein, the output shaft of the first motor 13 is directly and coaxially connected with the first main shaft 11, that is, the first motor 13 can realize two-gear driving under the switching of the first synchronizer 10; the output shaft of the second electric machine 14 is connected to the transmission shaft 41 of the transmission assembly through the first transmission gear 42 of the transmission assembly, the second transmission gear 43 in the transmission assembly can be connected or disconnected with the transmission shaft 41 through the second synchronizer 44, and the second transmission gear 43 is in transmission connection with the first gear train 2 or the second gear train 3, so that the second electric machine 14 can be connected to the first gear train 2 or the second gear train 3 through the transmission assembly, and the two electric machines can share two gear trains, thereby saving the cost.

Meanwhile, when only the first motor 13 needs to work, the second synchronizer 44 in the transmission assembly can disconnect the transmission shaft 41 and the first spindle 11, so that power transmission is cut off, the power output by the first motor 13 is prevented from being transmitted to the second motor 14, the second motor 14 is prevented from being dragged to rotate, energy consumption is avoided, and the problem of power loss is solved.

Fig. 2 is a schematic structural diagram of a power system of another pure electric vehicle provided in the embodiment of the present disclosure. As shown in fig. 2, the transmission assembly further includes a third transmission gear 45, the third transmission gear 45 is movably sleeved outside the transmission shaft 41, the second transmission gear 43 is in transmission connection with one of the input gear 21 of the first gear train 2 and the input gear 31 of the second gear train 3, and the third transmission gear 45 is in transmission connection with the other one of the input gear 21 of the first gear train 2 and the input gear 31 of the second gear train 3. For example, in fig. 2, the second transmission gear 43 is in driving connection with the input gear 21 of the first gear train 2, and the third transmission gear 45 is in driving connection with the input gear 31 of the third gear train 3.

As shown in fig. 2, the second synchronizer 44 is located between the second transmission gear 43 and the third transmission gear 45, and the first synchronizer 10 is also used for controlling the connection or disconnection mechanism of the third transmission gear 45 and the transmission shaft 41.

Therefore, the second transmission gear 43 and the third transmission gear 45 in the transmission assembly are respectively in transmission connection with the two gear trains, and the second synchronizer 44 controls the second transmission gear 43 or the third transmission gear 45 to be connected with the transmission shaft 41, so that the second motor 14 can be connected into the first gear train 2 and the second gear train 3, the second motor 14 can also realize two-gear driving, and the cost is saved.

Optionally, as shown in fig. 1, the power system further includes a third gear train 5 and a one-way clutch 61, an input gear 51 of the third gear train 5 is coaxially connected with the output shaft of the second motor 14, the input gear 51 of the third gear train 5 is in transmission connection with the first transmission gear 42, the one-way clutch 61 is disposed on the second spindle 12, and the one-way clutch 61 connects the output gear 52 of the third gear train 5 and the second spindle 12.

By providing the third gear train 5, the second electric machine 14 can be switched in the third gear train 5 in addition to sharing the first gear train 2 and the second gear train 3 with the first electric machine 13, so that the second electric machine 14 can realize more gear modes. By arranging the one-way clutch 61 between the third gear train 5 and the second spindle 12, when only the first motor 13 works, the one-way clutch 61 can prevent the power of the first motor 13 transmitted to the second spindle 12 from being transmitted to the second motor 14 through the third gear train 5, so as to reduce the dragging loss of the first motor 13 during working and further reduce the energy consumption.

Optionally, as shown in fig. 1, the power system further includes a fourth transmission gear 62, the fourth transmission gear 62 is coaxially sleeved outside the second main shaft 12, and a wheel 64 is in transmission connection with the fourth transmission gear 62 through a differential 63. In the disclosed embodiment, the input gear of the differential 63 is engaged with the fourth transmission gear 62 mounted on the second main shaft 12, so as to receive the power transmitted from the second main shaft 12, and achieve the purpose of driving the wheels 64 to rotate.

Wherein the differential 63 enables wheels 64 connected to the output shaft of the differential 63 to rotate at different rotational speeds. When the automobile runs in a turn, the turning radius of the inner side wheel 64 of the automobile is different from that of the outer side wheel 64 of the automobile, the turning radius of the outer side wheel 64 is larger than that of the inner side wheel 64, the rotating speed of the outer side wheel 64 is required to be higher than that of the inner side wheel 64 during the turning, and the differential 63 can be used for enabling the two wheels 64 to roll at different rotating speeds, so that the difference of the rotating speeds of the two wheels 64 is realized.

Alternatively, as shown in fig. 1, the power supply assembly 7 includes: a battery 71 and two inverters 72, the two inverters 72 being connected to the battery 71, respectively, the first motor 13 being connected to one of the two inverters 72, and the second motor 14 being connected to the other of the two inverters 72.

By providing two inverters 72, one for connecting the battery 71 and the first motor 13 and the other for connecting the battery 71 and the second motor 14. The battery 71 is a rechargeable battery 71, and the inverter 72 is disposed on an output circuit of the battery 71 and is configured to convert a direct current output by the battery 71 into a three-phase alternating current to drive the first motor 13 or the second motor 14.

The power system of the pure electric vehicle provided by the embodiment of the disclosure can operate in any one of power modes, wherein the power modes comprise a single-motor mode, a double-motor mode, a reversing mode and an energy recovery mode.

The following describes the control method for different power modes of the power system:

in the embodiment of the disclosure, when the power system of the pure electric vehicle is in the single-motor mode, the three-gear mode can be switched.

In some embodiments of the present disclosure, when the single-motor mode is the first gear mode, the control method includes:

the first motor 13 is controlled to work, the second motor 14 is controlled to stop, the first synchronizer 10 is controlled to enable the first main shaft 11 to be in transmission connection with the input gear 21 of the first gear train 2, and the second synchronizer 44 is controlled to enable the second transmission gear 43 to be disconnected with the transmission shaft 41.

FIG. 3 is an energy transfer schematic diagram of a power system of a pure electric vehicle in a single-motor mode according to an embodiment of the present disclosure. As shown in the figure, the second electric motor 14 is not operated, the first synchronizer 10 is in the left position, the second synchronizer 44 disconnects the second transmission gear 43 from the transmission shaft 41, and the vehicle is driven to run by the first electric motor 13. The power supply assembly 7 discharges, the inverter 72 converts direct current into three-phase alternating current and then drives an output shaft of the first motor 13 to rotate, the first motor 13 converts electric energy into mechanical energy and transmits the mechanical energy to the first spindle 11, and the mechanical energy is transmitted to the wheels 64 through the first synchronizer 10, the first gear train 2 and the second spindle 12, so that the first motor 13 is driven by the first gear alone to drive the vehicle to run.

In some embodiments of the present disclosure, when the single motor mode is the second gear mode, the control method includes:

controlling the first motor 13 to work, controlling the second motor 14 to stop, controlling the first synchronizer 10 to make the first main shaft 11 in transmission connection with the input gear 31 of the second gear train 3, and controlling the second synchronizer 44 to make the second transmission gear 43 disconnected with the transmission shaft 41.

FIG. 4 is an energy transfer schematic diagram of a power system of a pure electric vehicle in a single-motor mode according to an embodiment of the disclosure. As shown in fig. 4, the second electric motor 14 is not operated, the first synchronizer 10 is in the right position, the second synchronizer 44 disconnects the second transmission gear 43 from the transmission shaft 41, and the vehicle is driven to run by the first electric motor 13. The power supply assembly 7 discharges, the inverter 72 converts direct current into three-phase alternating current and then drives an output shaft of the first motor 13 to rotate, the first motor 13 converts electric energy into mechanical energy and transmits the mechanical energy to the first main shaft 11, and the mechanical energy is transmitted to the wheels 64 through the first synchronizer 10, the second gear train 3 and the second main shaft 12, so that the driving mode of the vehicle driven by the first motor 13 in a single second gear is realized.

In some embodiments of the present disclosure, when the single-motor mode is the first gear mode, the control method includes:

the first motor 13 is controlled to stop, the second motor 14 is controlled to work, the first synchronizer 10 is controlled to enable the first main shaft 11 to be in transmission connection with the input gear 21 of the first gear train 2, and the second synchronizer 44 is controlled to enable the second transmission gear 43 to be connected with the transmission shaft 41.

FIG. 5 is a schematic energy transfer diagram of a power system of a pure electric vehicle in a single-motor mode according to an embodiment of the present disclosure. As shown in fig. 5, the first motor 13 is not operated, the first synchronizer 10 is in the left position, and the second synchronizer 44 connects the second transmission gear 43 with the transmission shaft 41, so that the vehicle is driven by the second motor 14 to run. The power supply assembly 7 discharges, direct current is converted into three-phase alternating current through the inverter 72 to drive the main shaft of the second motor 14 to rotate, electric energy is converted into mechanical energy by the second motor 14 to be transmitted to the transmission shaft 41, and the mechanical energy is transmitted to the wheels 64 through the second transmission gear 43, the first synchronizer 10, the second gear train 3 and the second main shaft 12, so that the independent first-gear driving vehicle running mode of the second motor 14 is realized.

In some embodiments of the present disclosure, when the single motor mode is the three-gear mode, the control method includes:

the first motor 13 is controlled to stop, the second motor 14 is controlled to work, the first synchronizer 10 is controlled to disconnect the first main shaft 11 from the input gear 21 of the first gear train 2 and the input gear 31 of the second gear train 3, and the second synchronizer 44 is controlled to disconnect the second transmission gear 43 from the transmission shaft 41.

FIG. 6 is a schematic energy transfer diagram of a power system of a pure electric vehicle in a single-motor mode according to an embodiment of the present disclosure. As shown in fig. 6, the first electric motor 13 is not operated, the first synchronizer 10 is in the neutral position, the second synchronizer 44 disconnects the second transmission gear 43 from the transmission shaft 41, and the vehicle is driven to run by the second electric motor 14. The power supply assembly 7 discharges, the inverter 72 converts direct current into three-phase alternating current and then drives the main shaft of the second motor 14 to rotate, the second motor 14 converts electric energy into mechanical energy and transmits the mechanical energy to the third gear train 5, the mechanical energy is transmitted to the wheels 64 through the second main shaft 12, and the independent third gear driving vehicle running mode of the second motor 14 is achieved.

In the embodiment of the disclosure, when the power system of the pure electric vehicle is in the dual-motor mode, the three-gear mode can be switched.

In some embodiments of the present disclosure, when the dual-motor mode is the first gear mode, the control method includes:

the first motor 13 is controlled to work, the second motor 14 is controlled to work, the first synchronizer 10 is controlled to make the first main shaft 11 connected with the input gear 21 of the first gear train 2 in a transmission way, and the second synchronizer 44 is controlled to make the second transmission gear 43 connected with the transmission shaft 41.

FIG. 7 is a schematic energy transmission diagram of a power system of a pure electric vehicle in a dual-motor mode according to an embodiment of the present disclosure. As shown in fig. 7, the two motors are operated simultaneously, the first synchronizer 10 is in the left position, and the second synchronizer 44 connects the second transmission gear 43 with the transmission shaft 41, so that the two motors drive the vehicle to run simultaneously. The power supply assembly 7 discharges, the inverter 72 converts direct current into three-phase alternating current and then drives output shafts of the first motor 13 and the second motor 14 to rotate, the first motor 13 converts electric energy into mechanical energy and transmits the mechanical energy to the first spindle 11, the mechanical energy is transmitted to the first gear train 2 through the first synchronizer 10, the electric energy is converted into mechanical energy and transmitted to the transmission shaft 41 through the second motor 14, the mechanical energy is coupled at the input gear 21 of the first gear train 2 through the first gear train 2 and the first synchronizer 10 and then transmitted to the wheels 64 through the second spindle 12, and therefore the dual-motor vehicle driving mode in the first gear is achieved.

In some embodiments of the present disclosure, when the dual-motor mode is the second gear mode, the control method includes:

the first motor 13 is controlled to work, the second motor 14 is controlled to work, the first synchronizer 10 is controlled to enable the first main shaft 11 to be in transmission connection with the input gear 31 of the second gear system 3, and the second synchronizer 44 is controlled to enable the second transmission gear 43 to be connected with the transmission shaft 41.

FIG. 8 is a schematic energy transmission diagram of a power system of a pure electric vehicle in a dual-motor mode according to an embodiment of the present disclosure. As shown in fig. 8, the two motors are operated simultaneously, the first synchronizer 10 is in the right position, and the second synchronizer 44 connects the second transmission gear 43 with the transmission shaft 41, so that the two motors drive the vehicle to run simultaneously. The power supply assembly 7 discharges, direct current is converted into three-phase alternating current through the inverter 72 to drive output shafts of the first motor 13 and the second motor 14 to rotate, electric energy is converted into mechanical energy by the first motor 13 to be transmitted to the first spindle 11, the mechanical energy is transmitted to the second gear train 3 through the first synchronizer 10, the electric energy is converted into the mechanical energy by the second motor 14 to be transmitted to the transmission shaft 41 and transmitted to the second spindle 12 through the first gear train 2, power of the two motors is coupled with the second spindle 12 and then transmitted to the wheels 64 through the second spindle 12, and therefore the double-motor vehicle driving mode in the first gear is achieved.

In the embodiment of the disclosure, when the power system of the pure electric vehicle is in a reverse mode, the control method includes:

the first motor 13 is controlled to rotate reversely, the second motor 14 is controlled to stop, the first synchronizer 10 is controlled to make the first main shaft 11 in transmission connection with the input gear 21 of the first gear train 2 or the input gear 31 of the second gear train 3, and the second synchronizer 44 is controlled to make the second transmission gear 43 disconnected with the transmission shaft 41.

FIG. 9 is a schematic energy transmission diagram of a power system of a pure electric vehicle in a reverse mode according to an embodiment of the disclosure. As shown in fig. 9, at this time, the battery is discharged, the first synchronizer 10 is in the left position, the second synchronizer 44 disconnects the second transmission gear 43 from the transmission shaft 41, converts the direct current into the three-phase alternating current through the inverter 72, drives the output shaft of the first motor 13 to rotate reversely, and transmits the three-phase alternating current to the wheels 64 through the first main shaft 11, the first synchronizer 10, the first gear train 2 and the second main shaft 12, so as to control the wheels 64 to rotate reversely, and control the power system to be in the reverse mode.

In the embodiment of the disclosure, when the power system of the pure electric vehicle is in the energy recovery mode, the control method includes:

the first synchronizer 10 is controlled to disconnect the first main shaft 11 from both the input gear 21 of the first gear train 2 and the input gear 31 of the second gear train 3, the second synchronizer 44 is controlled to disconnect the second transmission gear 43 from the transmission shaft 41, and the second motor 14 is controlled to generate power. I.e. when the vehicle is coasting or braking, the powertrain provides a torque in the opposite direction to the vehicle, converting part of the kinetic energy of the vehicle via the second electric machine 14 into electric energy, which is stored in the battery for later use.

FIG. 10 is a schematic energy transmission diagram of a power system of a pure electric vehicle in an energy recovery mode according to an embodiment of the disclosure. As shown in fig. 10, under the sliding and braking conditions, the second motor 14 starts the power generation mode, the kinetic energy of the entire vehicle drives the second motor 14 to generate power through the wheels 64, the differential 63, the second spindle 12, the one-way clutch 61 and the third gear train 5, and finally the electric energy is stored in the battery, so as to realize the energy recovery function.

It should be noted that, in the embodiment of the present disclosure, the first motor 13 may also be used as a motor for energy recovery, and the control method may include: the first synchronizer 10 is controlled to make the first main shaft 11 in transmission connection with the input gear 21 of the first gear train 2 or the input gear 31 of the second gear train 3, the second synchronizer 44 is controlled to make the second transmission gear 43 disconnected with the transmission shaft 41, and the first motor 13 is controlled to generate electricity, so that the first motor 13 can recover energy in two gear modes.

Although the present disclosure has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure.