1. A multi-mode power-split hybrid vehicle drive system is characterized in that: including engine, planet row, first motor and second motor, the output shaft of engine is connected with the planet carrier that the planet was arranged through first clutch, the planet carrier passes through the ring gear connection that second clutch and planet were arranged, the output shaft of first motor and the sun gear fixed connection that the planet was arranged, fixedly connected with first gear on the ring gear, first gear passes through gear drive mechanism and is connected with differential mechanism's input gear transmission, fixedly connected with second gear on the output shaft of second motor, the second gear also passes through gear drive mechanism is connected with differential mechanism's input gear transmission, first motor is connected with power battery through first dc-to-ac converter, the second motor pass through the second dc-to-ac converter with power battery connects.

2. The multi-mode power-split hybrid vehicle drive system of claim 1, wherein: the gear transmission mechanism comprises a third gear and a fourth gear, the third gear and the fourth gear are coaxially arranged and fixedly connected, the third gear is meshed with the first gear and the second gear respectively, and the fourth gear is meshed with an input gear of the differential.

3. An automobile, characterized in that: a multi-mode power-split hybrid vehicle drive system including any of claims 1-2.

Background

Under the dual pressure of shortage of petroleum resources and environmental protection, the oil-electricity hybrid power is gradually becoming an important choice for the power transmission system of the automobile. The power shunt system can realize stepless speed regulation of the engine through a lever principle, so that the engine can work in a relatively high-efficiency range under most vehicle speed power of the vehicle. Due to the excellent economy of the power splitting system in urban conditions, hybrid vehicles based on the power splitting system have become one of the main choices of hybrid vehicles in the last two decades.

As shown in fig. 1, in the conventional power split hybrid vehicle, an engine is connected with a sun gear, a motor i is connected with a planet carrier, and the output torque of a gear ring of a planetary gear train is transmitted to a differential gear through a reduction gear train. In the hybrid system, the rotating speeds of the engine, the motor I and the gear ring accord with a lever principle. The motor I is required to be always kept in a working state to control the rotating speed of the engine, and the working point of the engine is controlled within a high-efficiency range.

In the conventional planet row power division hybrid system, when a vehicle runs purely electrically, a driving motor drives the vehicle, but a planet row gear ring connected with a power transmission system rotates along with the driving motor, so that a motor I is driven to idle, and energy loss is caused; when the vehicle runs at a low speed in a mixed mode, the motor I needs to rotate forwards to generate electricity, and the generated electric energy is stored in a power battery or is supplied to the motor II to drive the vehicle to run; when the vehicle is in high-speed hybrid cruising, in order to keep the engine at a high-efficiency rotating speed, the motor I needs to be driven in a reverse rotation mode to consume electric energy, the consumed electric energy is generated by the power battery and the motor II, and the extra energy consumption of the motor system is caused in the process, so that the high-speed oil consumption and the power performance of the existing power-split hybrid vehicle are always subjected to the problem of fouling.

Disclosure of Invention

The invention aims to provide a multi-mode power-split hybrid electric vehicle driving system and a vehicle, which can realize high-efficiency work under various working conditions including high-speed cruising and the like, reduce the comprehensive oil consumption, improve the dynamic property of the vehicle, or can be adapted to a smaller motor on the premise of not reducing the performance of the vehicle.

The multi-mode power split hybrid electric vehicle driving system comprises an engine, a planet row, a first motor and a second motor, wherein an output shaft of the engine is connected with a planet carrier of the planet row through a first clutch, the planet carrier is connected with a gear ring of the planet row through a second clutch, an output shaft of the first motor is fixedly connected with a sun gear of the planet row, the gear ring is fixedly connected with a first gear, the first gear is in transmission connection with an input gear of a differential mechanism through a gear transmission mechanism, an output shaft of the second motor is fixedly connected with a second gear, the second gear is also in transmission connection with the input gear of the differential mechanism through the gear transmission mechanism, the first motor is connected with a power battery through a first inverter, and the second motor is connected with the power battery through a second inverter.

The multi-mode power-split hybrid electric vehicle driving system comprises a gear transmission mechanism, a differential mechanism and a power output mechanism, wherein the gear transmission mechanism comprises a third gear and a fourth gear, the third gear and the fourth gear are coaxially arranged and fixedly connected, the third gear is meshed with the first gear and the second gear respectively, and the fourth gear is meshed with an input gear of the differential mechanism.

The automobile comprises the multi-mode power-split hybrid electric vehicle driving system.

Compared with the prior art, the multi-mode power split hybrid electric vehicle driving system and the vehicle have the difference that the multi-mode power split hybrid electric vehicle driving system and the vehicle have the advantages that the structure of a planet row hybrid system is kept, and meanwhile, the driving system can be switched into different modes by adding a clutch. When the pure electric driving is realized, the generator does not need to be used as a load to rotate along with the power transmission system to consume mechanical energy; when the electric motor is purely accelerated, the generator and the driving motor can be driven or fed back in parallel, so that higher power is obtained (or a smaller motor is allowed to be selected); when the vehicle is cruising at a high speed, the engine can directly drive the vehicle without the need of reverse driving of the generator to reduce the rotating speed of the engine, so that unnecessary reverse series connection is avoided to consume mechanical energy of the system; and the generator and the driving motor can be driven in parallel with the engine, so that the maximum power output is obtained. Therefore, the whole driving system can realize high-efficiency work under various working conditions including high-speed cruising and the like, the comprehensive oil consumption is reduced, the dynamic property of the vehicle is improved, or a smaller motor can be adapted on the premise of not reducing the performance of the vehicle.

The invention will be further explained with reference to the drawings.

Drawings

FIG. 1 is a schematic diagram of a power split hybrid system in the prior art;

fig. 2 is a schematic structural diagram of a multi-mode power-split hybrid vehicle drive system according to the present invention.

Detailed Description

As shown in fig. 2, the multi-mode power-split hybrid vehicle driving system of the present invention includes an engine 1, a planetary gear set, a first motor 9 and a second motor 17, wherein an output shaft of the engine 1 is connected to a carrier 4 of the planetary gear set through a first clutch 2, the carrier 4 is connected to a ring gear 5 of the planetary gear set through a second clutch 3, an output shaft of the first motor 9 is fixedly connected to a sun gear 7 of the planetary gear set, a first gear 8 is fixedly connected to the ring gear 5, the first gear 8 is in transmission connection with an input gear 15 of a differential 14 through a gear transmission mechanism, an output shaft of the second motor 17 is fixedly connected to a second gear 16, the second gear 16 is also in transmission connection with the input gear 15 of the differential 14 through the gear transmission mechanism, the first motor 9 is connected to a power battery 19 through a first inverter 10, the second motor 17 is connected to the power battery 19 via a second inverter 18. The power battery 19 is used for supplying power to the motor or storing electric energy generated by the motor.

When the first clutch 2 is engaged, the engine 1 is fixedly connected with the planet carrier 4, and when the first clutch 2 is disengaged, the engine 1 is disconnected with the planet carrier 4. When the second clutch 3 is engaged, the planet carrier 4 is fixedly connected with the ring gear 5, and conversely, when the second clutch 3 is disengaged, the planet carrier 4 is disconnected from the ring gear 5. The structure and operation principle of the clutch are the prior art, and the details thereof are not described herein.

The planet row comprises a sun gear 7, a planet gear 6, a planet carrier 4 and a gear ring 5, which are prior art, and detailed description of the specific structure and working principle thereof is omitted here.

The multi-mode power-split hybrid vehicle driving system comprises a third gear 11 and a fourth gear 12, wherein the third gear 11 and the fourth gear 12 are coaxially arranged and fixedly connected, the third gear 11 is meshed with a first gear 8 and a second gear 16 respectively, and the fourth gear 12 is meshed with an input gear 15 of a differential 14.

Because the ring gear 5 and the first gear 8 are fixedly connected, the first gear 8 can rotate along with the ring gear 5, and because the first gear 8 and the second gear 16 are both meshed with the third gear 11, and the fourth gear 12 is meshed with the input gear 15 of the differential 14, the ring gear 5, the first gear 8, the third gear 11, the fourth gear 12 and the input gear 15 of the differential 14 can form one power transmission path, and the second gear 16, the third gear 11, the fourth gear 12 and the input gear 15 of the differential 14 can form another power transmission path.

The automobile comprises the multi-mode power-split hybrid electric vehicle driving system.

Compared with the prior art, the multi-mode power split hybrid electric vehicle driving system and the vehicle have the difference that the multi-mode power split hybrid electric vehicle driving system and the vehicle have the advantages that the structure of a planet row hybrid system is kept, and meanwhile, the driving system can be switched into different modes by adding a clutch. When the pure electric driving is realized, the generator does not need to be used as a load to rotate along with the power transmission system to consume mechanical energy; when the electric motor is purely accelerated, the generator and the driving motor can be driven or fed back in parallel, so that higher power is obtained (or a smaller motor is allowed to be selected); when the vehicle is cruising at a high speed, the engine 1 can also directly drive the vehicle, and the generator is not required to be reversely driven to reduce the rotating speed of the engine 1, so that unnecessary reverse series connection is avoided to consume mechanical energy of the system; and the generator, the driving motor can be driven in parallel with the engine 1, thereby obtaining maximum power output. Therefore, the whole driving system can realize high-efficiency work under various working conditions including high-speed cruising and the like, the comprehensive oil consumption is reduced, the dynamic property of the vehicle is improved, or a smaller motor can be adapted on the premise of not reducing the performance of the vehicle.

In the invention, when the pure electric vehicle normally runs, cruises and feeds back, the first motor 9 does not need to idle along with the power transmission system, thereby reducing the mechanical loss; when the pure electric motor is used for emergency acceleration and emergency braking (feedback), the first motor 9 and the second motor 17 can be driven in parallel or used for braking feedback, so that higher power output is obtained, or a smaller motor is allowed to be selected to reduce the total weight, the cost and the total size; when the vehicle is cruising at a high speed and overtaking in an accelerating mode, the engine 1 can directly drive the vehicle without the need of forming negative shunt (generated by the second motor 17 and driven by the first motor 9) by the second motor 17 and the first motor 9 so as to control the rotating speed of the engine 1, unnecessary energy consumption is avoided, the overall efficiency of the system is improved, and the first motor 9 and the second motor 17 can be simultaneously connected with the engine 1 in parallel to drive the vehicle so as to obtain the maximum power output if required. Therefore, the defects that the existing planet row coupling hybrid system is not energy-saving at high speed and poor in dynamic property are overcome.

The following describes various modes of the multi-mode power-split hybrid vehicle drive system of the present invention.

Pure electric conventional driving, cruising and feedback (such as traffic jam working condition and urban working condition): the first clutch 2 and the second clutch 3 are both disengaged, and the second motor 17 inputs driving torque to the differential 14 through the second gear 16, the third gear 11, the fourth gear 12, and the input gear 15 of the differential 14, thereby driving the vehicle to run.

Pure electric rapid acceleration and rapid deceleration (feedback): the first clutch 2 is disconnected, and the engine 1 is stopped; the second clutch 3 is combined, the planetary row is locked, and the first motor 9 and the second motor 17 are connected in parallel to drive the vehicle to accelerate, run or decelerate. In the process, the first motor 9 inputs driving torque to the differential 14 through the planetary row, the first gear 8, the third gear 11, the fourth gear 12 and the input gear 15 of the differential 14, thereby driving the vehicle to run; meanwhile, the second electric machine 17 can also input driving torque to the differential 14 through the second gear 16, the third gear 11, the fourth gear 12 and the input gear 15 of the differential 14, thereby driving the vehicle to run. That is, the first motor 9 and the second motor 17 can drive the vehicle in parallel to travel.

Medium-low speed hybrid (such as city working condition and low electric quantity): the first clutch 2 is combined, the second clutch 3 is disconnected, the engine 1 is coupled with the sun gear 7 connected with the first motor 9 and the gear ring 5 connected with the second motor 17 through the planet carrier 4 to form a power dividing system, the first motor 9 controls the rotating speed of the engine 1 to realize stepless speed regulation, and the engine 1 always works in a high-efficiency area. In the process, the engine 1 inputs driving torque to the differential 14 through the planetary row, the first gear 8, the third gear 11, the fourth gear 12 and the input gear 15 of the differential 14, so as to drive the vehicle to run, and at the same time, the first electric machine 9 interacts with the sun gear 7 and the planetary gear 6 connected with the first electric machine, so as to control the rotating speed of the planetary carrier 4, namely the rotating speed of the engine 1.

Medium and high speed running and accelerating (such as high speed cruising and overtaking): the first clutch 2 and the second clutch 3 are combined, the planetary row and the engine 1 are crankshaft-locked, the engine 1 is directly driven and connected in parallel with the first motor 9 and the second motor 17, at this time, the engine 1 and the first motor 9 can input the driving torque to the differential 14 through the planetary row, the first gear 8, the third gear 11, the fourth gear 12 and the input gear 15 of the differential 14, and the second motor 17 can input the driving torque to the differential 14 through the second gear 16, the third gear 11, the fourth gear 12 and the input gear 15 of the differential 14, so that the engine 1, the first motor 9 and the second motor 17 can simultaneously output power to the wheels 13, thereby obtaining the maximum power output.

In the present invention, the power sources are the engine 1, the first motor 9, and the second motor 17, the driven object is the wheel 13, and the power sources drive the wheel 13 through the power transmission system. In the present embodiment, the power train includes the first clutch 2, the second clutch 3, the planetary row, the first gear 8, the second gear 16, the gear train (i.e., the third gear 11 and the fourth gear 12), the input gear 15 of the differential 14, and the differential 14. The differential 14 is conventional, and its specific structure and how to drive the wheels 13 are not described herein.

It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.