1. A safety control method for an extended-range electric cold-chain logistics vehicle is characterized by comprising the following steps:

when the vehicle normally runs, selecting a vehicle running mode;

dividing the vehicle safety faults into two types, wherein the first type is a mechanical fault, and the second type is a circuit fault;

when a safety fault of the vehicle is detected, acquiring corresponding fault code information, and judging whether the safety fault belongs to a mechanical fault or a circuit fault according to a preset fault source analysis algorithm;

when the mechanical fault is judged, analyzing the specific fault reason and formulating a solution;

and when the circuit fault is judged, the power generation of the range-extended power generation device is preferentially stopped, the specific fault reason is analyzed, and a solution is formulated.

2. The extended range electric cold-chain logistics vehicle safety control method of claim 1, characterized in that: the vehicle running mode comprises a range extending mode and a driving mode;

the range-extending mode is that on the premise of ensuring the power supply of the cold chain vehicle compartment, the power is preferentially supplemented to the vehicle battery through the range-extending power generation device;

the driving mode is that under the prerequisite of guaranteeing cold chain car carriage power supply, the vehicle battery supplies power for driving motor, and driving motor drives the vehicle and steadily traveles.

3. The extended range electric cold-chain logistics vehicle safety control method of claim 1, characterized in that: the mechanical failure comprises insufficient power of the oil pump, and a standby oil pump is arranged aiming at the insufficient power of the oil pump;

when it is judged that the cause of the mechanical failure is insufficient power of the oil pump, the backup oil pump is started.

4. The extended range electric cold-chain logistics vehicle safety control method of claim 1, characterized in that: the mechanical fault comprises oil leakage of an oil tank, and a standby oil tank is arranged aiming at the oil leakage of the oil tank;

and when the reason of the mechanical fault is judged to be oil leakage of the oil tank, starting the spare oil tank.

5. The extended range electric cold chain logistics vehicle safety control method of claim 4, wherein: judging the oil efficiency and the atomization speed through the pressure difference of the fuel pump within 40MPA and the release times of the FTIV isolating valve;

then, the setting of the power generation expected current of 110A limit of 42KW and the rotating speed of 3000RPM are compared to calculate, so that whether the oil tank leaks oil is judged;

when oil leakage of the oil tank is judged, the vehicle instrument gives out alarm sound.

6. The extended range electric cold-chain logistics vehicle safety control method of claim 1, characterized in that: mechanical failure still includes that the gas vent spark splashes, and to gas vent spark splash be greater than 25CM intervals setting with fuel sprayer and oil inlet to with air inlet and fuel sprayer parallel arrangement in vertical direction.

7. The extended range electric cold-chain logistics vehicle safety control method of claim 1, characterized in that: the mechanical faults also comprise engine torque faults, and the following solutions are made for the engine torque faults:

when the engine torque does not accord with the acceleration, analyzing the acceleration and then adjusting the engine torque;

when the vehicle runs on a slope and the engine torque is started, the motor can not work normally, and the vehicle is stopped temporarily in place through motor braking.

8. The extended range electric cold-chain logistics vehicle safety control method of claim 1, characterized in that: circuit faults include overheating of the power generation;

when the power generation is judged to be overheated, judging whether the power supply temperature is overheated due to the power generation of the engine;

when judging that the engine generates electricity and causes the electricity supplementing temperature to be overheated, cooling the temperature through the cooling liquid.

9. The extended range electric cold-chain logistics vehicle safety control method of claim 1, characterized in that: circuit faults also include charging faults;

when the charging fault is judged, the driving motor drives the vehicle to slowly run on the premise of ensuring that the vehicle battery supplies power to the cold chain vehicle compartment, and meanwhile, the power supply to other accessories of the vehicle is cut off.

10. The utility model provides a commodity circulation car which characterized in that: the safety control method of the extended range electric cold-chain logistics vehicle comprises any one of the claims 1 to 9.

Background

The range-extended electric cold-chain logistics vehicle is one of special vehicles and has higher specificity. The extended-range electric cold-chain logistics vehicle is mainly used for long-distance transportation and short-distance store distribution of deformable, easily fermented, perishable and perishable goods such as beef and mutton rolls, fresh milk, seafood, fruits and the like, has the advantages of flexibility, convenience, rapidness, strong adaptability, few intermediate links, capability of realizing door-to-door, store-to-store, store-to-point transportation and the like, and the cold-chain logistics transportation becomes an important component of logistics.

For the range-extended electric cold-chain logistics vehicle, the range-extended power generation device is mainly used for supplying power to a vehicle battery or directly driving a driving motor. The range-extended power generation device comprises an engine and a generator, wherein the engine provides power for the generator, and the generator provides electric quantity for a vehicle battery or directly drives a driving motor. When the logistics vehicle has a safety fault, the normal power generation of the range-extending power generation device and the power supply of the vehicle battery cannot be ensured, so that the use of the logistics vehicle is influenced.

Disclosure of Invention

Therefore, a safety control method for the range-extended electric cold-chain logistics vehicle and the logistics vehicle are needed to be provided, so that the technical problem that the use of the logistics vehicle is affected due to the fact that the normal power generation of the range-extended power generation device and the power supply of a vehicle battery cannot be guaranteed when the existing logistics vehicle has a safety fault is solved.

In order to achieve the above object, the inventor provides a safety control method for an extended range electric cold-chain logistics vehicle, comprising the following steps:

when the vehicle normally runs, selecting a vehicle running mode;

dividing the vehicle safety faults into two types, wherein the first type is a mechanical fault, and the second type is a circuit fault;

when a safety fault of the vehicle is detected, acquiring corresponding fault code information, and judging whether the safety fault belongs to a mechanical fault or a circuit fault according to a preset fault source analysis algorithm;

when the mechanical fault is judged, analyzing the specific fault reason and formulating a solution;

and when the circuit fault is judged, the power generation of the range-extended power generation device is preferentially stopped, the specific fault reason is analyzed, and a solution is formulated.

Further, the vehicle running mode includes a range extending mode and a driving mode;

the range-extending mode is that on the premise of ensuring the power supply of the cold chain vehicle compartment, the power is preferentially supplemented to the vehicle battery through the range-extending power generation device;

the driving mode is that under the prerequisite of guaranteeing cold chain car carriage power supply, the vehicle battery supplies power for driving motor, and driving motor drives the vehicle and steadily traveles.

Further, the mechanical failure comprises insufficient power of the oil pump, and a standby oil pump is arranged for the insufficient power of the oil pump;

when it is judged that the cause of the mechanical failure is insufficient power of the oil pump, the backup oil pump is started.

Further, the mechanical fault comprises oil leakage of an oil tank, and a standby oil tank is arranged aiming at the oil leakage of the oil tank;

and when the reason of the mechanical fault is judged to be oil leakage of the oil tank, starting the spare oil tank.

Further, the oil outlet efficiency and the atomization speed are judged according to the pressure difference of the fuel pump within 40MPA and the release times of the FTIV isolating valve;

then, whether the oil leaks from the oil tank is judged by comparing the set value of the power of 42KW with the expected generated current of 110A limit with the rotating speed of 3000 RPM;

when oil leakage of the oil tank is judged, the vehicle instrument gives out alarm sound.

Further, mechanical failure still includes that the gas vent spark splashes, and to gas vent spark splash is greater than 25CM intervals setting with fuel sprayer and oil inlet to with air inlet and fuel sprayer parallel arrangement in vertical direction.

Further, the mechanical fault also comprises the fault of the engine torque, and the following solutions are made for the fault of the engine torque:

when the engine torque does not accord with the acceleration, analyzing the acceleration and then adjusting the engine torque;

when the vehicle runs on a slope and the engine torque is started, the motor can not work normally, and the vehicle is stopped temporarily in place through motor braking.

Further, circuit failures include excessive power generation;

when the power generation is judged to be overheated, judging whether the temperature is overheated due to the power generation of the engine;

when the temperature is judged to be overheated due to the power generation of the engine, the temperature is cooled through the cooling liquid.

Further, circuit failures also include charging failures;

when the charging fault is judged, the driving motor drives the vehicle to slowly run on the premise of ensuring that the vehicle battery supplies power to the cold chain vehicle compartment, and meanwhile, the power supply to other accessories of the vehicle is cut off.

The safety control method is characterized in that safety faults are divided into mechanical faults and circuit faults, when the vehicle has the safety faults, whether the vehicle belongs to the mechanical faults or the circuit faults is judged according to fault code information, if the vehicle belongs to the circuit faults, the power generation of the range-extended power generation device needs to be stopped for a limited time for a protection circuit, and then specific fault reasons are analyzed, so that the problem is solved. When a mechanical failure occurs, since it is not certain which module has a problem, further analysis of the cause of the failure and re-solution are required. Particularly, when the default of a system capable of automatically recovering the limit mechanical characteristics is not mechanical fault, for example, when the engine speed is greater than 6500 revolutions, the cylinder stroke and the stroke are normal when the oil loss is over the response time, and when the engine speed is recovered to 1500 revolutions under 10 times of air pressure compression ratio, if the oil can be re-eaten, the fault is not reported. The normal use of the logistics vehicle is ensured by judging the fault type so as to timely process the fault.

In order to achieve the above object, the inventor further provides a logistics vehicle, including any one of the extended range electric cold chain logistics vehicle safety control methods provided by the inventor.

The safety control method is characterized in that safety faults are divided into mechanical faults and circuit faults, when the vehicle has the safety faults, whether the vehicle belongs to the mechanical faults or the circuit faults is judged according to fault code information, if the vehicle belongs to the circuit faults, the power generation of the range-extended power generation device needs to be stopped for a limited time for a protection circuit, and then specific fault reasons are analyzed, so that the problem is solved. When a mechanical failure occurs, since it is not certain which module has a problem, further analysis of the cause of the failure and re-solution are required. Particularly, when the default of a system capable of automatically recovering the limit mechanical characteristics is not mechanical fault, for example, when the engine speed is greater than 6500 revolutions, the cylinder stroke and the stroke are normal when the oil loss is over the response time, and when the engine speed is recovered to 1500 revolutions under 10 times of air pressure compression ratio, if the oil can be re-eaten, the fault is not reported. The normal use of the logistics vehicle is ensured by judging the fault type so as to timely process the fault.

Drawings

FIG. 1 is a schematic structural diagram of a logistics vehicle according to an embodiment;

FIG. 2 is a schematic block diagram of a logistics vehicle according to an embodiment;

fig. 3 is a flow chart of a safety control method for the extended range electric cold-chain logistics vehicle according to an embodiment of the invention.

Description of reference numerals:

1. a drive battery;

2. a range-extended power generation device;

3. a drive motor;

4. a low-temperature compartment;

5. a refrigeration unit;

6. and (7) wheels.

Detailed Description

To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, 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 by those skilled in the art according to specific situations.

In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described with reference to the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

Referring to fig. 1, the embodiment provides a logistics vehicle including the safety control method of the extended range electric cold chain logistics vehicle. The safety control method mainly solves the problems that the vehicle range-extended power generation device cannot generate power when power is required and cannot generate power when power is generated. And aiming at the power generation faults, the power generation faults are divided into two types, and corresponding solutions are determined according to the fault types.

A low-temperature compartment 4 and a refrigerating unit 5 are arranged in the compartment of the logistics car, and the refrigerating unit 5 is used for refrigerating the low-temperature storage space; the refrigerating unit 5 is arranged at the top of the carriage, and the top of the refrigerating unit 5 extends out of the top of the carriage. In order to mount the refrigerating unit 5, an opening slightly larger than the refrigerating unit 5 is formed in the top of the vehicle compartment, and then the refrigerating unit 5 is mounted in the opening, and the bottom of the refrigerating unit 5 extends into the vehicle compartment through the opening. The refrigerating unit 5 can be a heat pump refrigerating unit 5, and structurally the refrigerating unit 5 adopts an integral structure, the refrigerating unit 5 comprises a shell, a compressor, a radiator and a condenser, and the compressor, the radiator and the condenser are arranged in the shell. The compressor, the radiator and the condenser are connected through metal pipelines, a refrigerant circulates inside the compressor, the refrigerant is compressed through the compressor, and after the heat of the refrigerant is dissipated by the radiator, the refrigerant expands in the evaporator to absorb heat, so that the low-temperature carriage 4 is refrigerated. The top of the refrigerating unit 5 exchanges heat with the outside air, and the bottom of the refrigerating unit 5 cools the air in the low-temperature compartment 4. In order to prevent the cold air in the low-temperature compartment 4 from diffusing outwards, the inner wall of the low-temperature compartment 4 is provided with a heat insulation layer.

Preferably, the length of the body of the logistics vehicle can be 4.5 meters to 5.99 meters, and the refrigerating unit 5 is used for refrigerating the inner space of the low-temperature compartment 4, so that the low-temperature compartment 4 is kept in a set low-temperature range (for example, -70 degrees to 5 degrees) when transporting goods.

As shown in fig. 2, in the present embodiment, the logistics vehicle is provided with a drive battery 1, a drive motor 3, and an extended range power generation device 2. The driving motor 3 is in transmission connection with the wheels 6 and used for driving the logistics vehicle to run, the driving battery 1 is electrically connected with the driving motor 3, and the driving battery 1 is used for supplying power to the driving motor 3. The refrigerating unit 5 is also electrically connected with the driving battery 1, and the driving battery 1 supplies power to the refrigerating unit 5. The range-extending power generation device 2 is electrically connected with the driving battery 1 and is used for supplementing power to the driving battery 1, so that the cruising mileage of the cold-chain logistics vehicle is improved. The logistics vehicle is provided with the range-extending power generation device 2, and the range-extending power generation device 2 can generate power and charge the driving battery 1, so that the cruising mileage of the cold-chain logistics vehicle is improved. The range-extended power generation device 2 can supplement power for the driving battery 1 and can also directly drive the driving motor 3 to work without directly driving the driving motor 3 through the driving battery 1.

In the present embodiment, the range-extended power generation device 2 includes an engine and a generator, the engine is used for driving the generator to generate power, the generator is electrically connected with the driving battery, and the generator is used for charging the driving battery. The engine is used for converting thermal energy generated by fuel combustion into mechanical energy, and then driving the generator to rotate and generate electricity through the mechanical energy. In the present embodiment, the engine is a gasoline engine, and preferably, the engine is an atkinson engine with a displacement of 1.5L.

The technical scheme provides a safety control method for the extended-range electric cold-chain logistics vehicle, which divides safety faults into mechanical faults and circuit faults, judges whether the vehicle belongs to the mechanical faults or the circuit faults according to fault code information when the vehicle has the safety faults, and if the vehicle belongs to the circuit faults, the power generation of the extended-range power generation device needs to be stopped in a limited way for a protection circuit, and then specific fault reasons are analyzed to solve the problems. When a mechanical failure occurs, since it is not certain which module has a problem, further analysis of the cause of the failure and re-solution are required. Particularly, when the default of a system capable of automatically recovering the limit mechanical characteristics is not mechanical fault, for example, when the engine speed is greater than 6500 revolutions, the cylinder stroke and the stroke are normal when the oil loss is over the response time, and when the engine speed is recovered to 1500 revolutions under 10 times of air pressure compression ratio, if the oil can be re-eaten, the fault is not reported. The normal use of the logistics vehicle is ensured by judging the fault type so as to timely process the fault.

In the range extending system, a Generator Controller (GCU) has two functions of alternating current and direct current conversion and control, and receives related signals of the motor speed, a vehicle control unit and the like.

The VCU judges the driving intention of a driver by acquiring signals of an accelerator pedal, a gear, a brake pedal and the like; the method comprises the steps that by monitoring vehicle state (vehicle speed, temperature and the like), after being judged and processed by a VCU, running state control instructions of vehicles are sent to a power system and a power battery system, and meanwhile, the working mode of a vehicle-mounted accessory power system is controlled; the VCU has the functions of fault diagnosis, protection and storage of the whole vehicle system.

And the Electronic Controller Unit (ECU) consists of a Microcontroller (MCU), a memory (ROM and RAM), an input/output interface (I/O), an analog-to-digital converter (A/D), a shaping circuit, a driving circuit and other large-scale integrated circuits. The ECU is generally provided with a fault self-diagnosis and protection function, and when a system has a fault, it can automatically record a fault code in the RAM and use a protection measure to read a substitute program from the inherent program to maintain the operation of the engine. The ECU controls the air inflow, the oil injection quantity, the ignition time, the power follow-up calculation and the like of the engine, thereby determining the running efficiency, the power, the torque force and the like of the engine.

English abbreviation for noise, vibration and harshness (NVH). This is a comprehensive measure of the quality of a vehicle's manufacture and gives the vehicle user the most immediate and surface experience.

The MCU is named as a motor controller, and a CPU, an RAM, a ROM, a timing counter and various I/O interfaces of the computer are integrated on one chip to form a motor control solution of the chip-level computer, so that different combinations of torque and driving motor output in different application occasions are controlled.

The Battery Management System (BMS) is a set of control system for protecting the use safety of the power battery, constantly monitors the use state of the battery, relieves the inconsistency of the battery pack through necessary measures, and provides guarantee for the use safety of the new energy vehicle.

Referring to fig. 3, the embodiment further provides a safety control method for the extended-range electric cold-chain logistics vehicle, which includes the following steps:

s01: when the vehicle normally runs, selecting a vehicle running mode;

s02: dividing the vehicle safety faults into two types, wherein the first type is a mechanical fault, and the second type is a circuit fault;

s021: when a safety fault of the vehicle is detected, acquiring corresponding fault code information, and judging whether the safety fault belongs to a mechanical fault or a circuit fault according to a preset fault source analysis algorithm;

s0211: when the mechanical fault is judged, analyzing the specific fault reason and formulating a solution;

s0212: and when the circuit fault is judged, the power generation of the range-extended power generation device is preferentially stopped, the specific fault reason is analyzed, and a solution is formulated.

In addition, when the fault cause is cleared, the vehicle safety system can strengthen learning on the rack and the VCU for mode training, and safety parameters and threshold values are set and adjusted according to the training result, so that the driving economy is further ensured under the condition of ensuring the safety.

The technical scheme provides a safety control method for the extended-range electric cold-chain logistics vehicle, which divides safety faults into mechanical faults and circuit faults, judges whether the vehicle belongs to the mechanical faults or the circuit faults according to fault code information when the vehicle has the safety faults, and if the vehicle belongs to the circuit faults, the power generation of the extended-range power generation device needs to be stopped in a limited way for a protection circuit, and then specific fault reasons are analyzed to solve the problems. When a mechanical failure occurs, since it is not certain which module has a problem, further analysis of the cause of the failure and re-solution are required. Particularly, when the default of a system capable of automatically recovering the limit mechanical characteristics is not mechanical fault, for example, when the engine speed is greater than 6500 revolutions, the cylinder stroke and the stroke are normal when the oil loss is over the response time, and when the engine speed is recovered to 1500 revolutions under 10 times of air pressure compression ratio, if the oil can be re-eaten, the fault is not reported. The normal use of the logistics vehicle is ensured by judging the fault type so as to timely process the fault.

The vehicle running mode comprises a range extending mode and a driving mode. When the vehicle runs stably, the vehicle self condition is good, and the SOC value of the vehicle battery is in a first preset range, setting reminding and switching to a range extending mode; the range-extending mode is that the vehicle battery is charged preferentially through the range-extending power generation device on the premise of ensuring the power supply of the cold chain vehicle compartment. Wherein the first predetermined range of SOC values is greater than 6%. The premise of the range-extending mode is that when the vehicle runs stably, the vehicle is in good condition and the SOC value of the vehicle battery is more than 6%, the vehicle battery is charged by the range-extending power generation device 2 on the premise of ensuring that the power of the refrigerating unit 5 is 260W-500W, and the vehicle battery is ensured to reach a certain electric quantity, so that the requirement of subsequent routes is met.

When the vehicle runs stably, the vehicle self condition is good, and the SOC value of the vehicle battery is in a second preset range, setting reminding and switching to a driving mode; the driving mode is that under the prerequisite of guaranteeing the power supply of cold chain car carriage, the vehicle battery supplies power for driving motor, and driving motor drives the vehicle and steadily traveles, and the torsional damper drives the engine torque threshold and sets up at 140NM, 4000 RPM. Wherein the second predetermined range of SOC values is greater than 60%. Under the condition that the vehicle battery has certain electric quantity enough to meet the working requirement of the refrigerating unit 5 in the driving mode, the rest vehicle batteries are preferentially distributed to the driving motor, and the rest vehicle batteries are distributed to the vehicle accessories, so that the reasonable utilization of the vehicle batteries is ensured. Preferably, the driving mode is divided into an energy maintaining mode and an energy consuming mode according to the running condition of the vehicle; the energy maintaining mode is that when the vehicle runs at a medium-high speed working condition, the range-extended power generation device directly supplies power to the battery while supplying power to the cold chain vehicle compartment; the energy consumption mode is that when the vehicle runs under the urban working condition, the vehicle battery supplies power to the driving motor. When the vehicle runs at a medium-high speed working condition, the vehicle is generally at a high speed or a few road sections, the required power of the wheel edge is not high, in order to maintain energy, the range-extending power generation device is used for efficiently working, and the power generation device is in a comfortable power interval to supply power to a cold chain vehicle compartment and simultaneously supply power to a battery. When the vehicle runs under urban working conditions, the number of vehicles is large, the speed of the vehicle is relatively slow, the required power of the wheel edge is increased, energy is consumed at the moment, and the vehicle battery directly supplies power to the driving motor.

Further, mechanical failures are divided into the failure of oil pump power shortage, oil leakage of oil tank, spark splashing at exhaust port and the failure of engine torque. After the mechanical fault is judged, the mechanical fault is determined. When the judgment is that the oil pump is insufficient in power or the oil tank leaks oil, redundancy design can be carried out, namely, a standby oil pump or oil tank is arranged, so that the standby oil pump or oil tank can be started when the oil pump is insufficient in power or the oil tank leaks oil, and the technical problem is fundamentally solved. In addition, a plurality of partition plates can be arranged in the oil tank for the oil leakage fault of the oil tank, so that more loss can be avoided, and the loss is less.

When the judgment is that the spark splashes at the exhaust port, the oil nozzle and the oil inlet are arranged at an interval of more than 25CM aiming at the spark splashes at the exhaust port, and the air inlet and the oil nozzle are arranged in parallel in the vertical direction. Set up fuel sprayer and oil inlet interval certain distance to set up air inlet and fuel sprayer not on the coplanar, be in order to prevent that the gas vent from appearing the spark and splashing, avoid the conflagration to take place.

When the engine torque is judged to have faults, the following solutions are made for the engine torque faults: when the engine torque does not accord with the acceleration, analyzing the acceleration and then adjusting the engine torque; when the vehicle runs on a slope and the engine torque is started, the motor can not work normally, and the vehicle is stopped temporarily in place through motor braking. Specifically, the engine torque failure is divided into two types, the first type is that the engine torque does not accord with the acceleration, and the second type is that the vehicle runs on a slope, and the motor generates heat when the engine torque is started but cannot work normally to climb the slope. In the case of a fault in the first case, the engine torque is adjusted by analyzing the acceleration to ensure that the vehicle can be expected to accelerate or decelerate. For the fault of the second situation, when the vehicle runs on a slope, if the slope angle is 35 degrees, the motor cannot normally work when the engine torque is started, namely the motor cannot support forward rotation, at this time, the motor torque is converted into heat energy loss, the motor is required to brake to stop the vehicle, when the vehicle stops on site, torque is output, and the electronic brake can also consume residual torque energy through excitation coupling to enable the acceleration to be 0. And restarting the vehicle after the vehicle stops to enable the torque of the engine to support the normal work of the motor.

As a preferred embodiment, the oil efficiency and the atomization speed are judged by the pressure difference of the fuel pump within 40MPA and the release times of the FTIV isolating valve; then, whether the oil leaks from the oil tank is judged by comparing the set value of the power of 42KW with the expected generated current of 110A limit with the rotating speed of 3000 RPM; when oil leakage of the oil tank is judged, the vehicle instrument gives out alarm sound. The fuel tank comprises a fuel tank body and a carbon tank, wherein the fuel tank body is made of stainless steel metal materials, two fixing mounting plates are arranged on the front side and the rear side of the fuel tank body, fixing screw holes are formed in the end portions of the fixing mounting plates, a fuel pump is arranged in the middle of the top end of the fuel tank body, a liquid collector is arranged on the left side of the fuel pump, and the liquid collector is connected with the fuel pump through a first pipe; one end of the liquid collector, which is far away from the first pipeline, is connected with a second pipe, and the end part of the second pipe is provided with a three-way pipe; one interface of the three-way pipe is connected with an FTIV isolating valve through a pipe III, the other port of the FTIV isolating valve is connected with a fuel vapor pressure sensor, the FTIV isolating valve and the fuel vapor pressure sensor are both arranged at the front end of the fuel tank body, and the fuel vapor pressure sensor is positioned on the right side of the FTIV isolating valve; outlets and inlets are distributed on the front and the back of the right side of the carbon tank, and the inlets are connected with the fuel oil steam pressure sensor through a carbon tank connecting pipe; the right end of the oil tank body is provided with a filling port, the filling port is communicated with the oil tank body through an oil filling pipe, and an outlet of the carbon tank is connected with the filling port through a discharge pipe; the other interface of the three-way pipe is connected with a circulating pipe, and one end of the circulating pipe, which is far away from the three-way pipe, is connected to the filling port. The fuel tank is made of stainless steel dish materials, and residual fuel oil can be atomized and collected through backflow of an oil pipe when the engine does not start the generator to be charged through the FTIV isolating valve and the fuel oil steam pressure sensor in cooperation with the carbon tank. In addition, when the vehicle sends out the alarm sound of the vehicle instrument, the spare oil tank can be replaced, the charging can be stopped, and the vehicle can be driven to the nearest maintenance point for maintenance.

Further, the circuit fault includes power generation overheating and charging fault, and after the circuit fault is judged, the power generation of the range-extended power generation device is preferentially stopped, and the circuit fault is determined. When the power generation is judged to be overheated, judging whether the temperature is overheated due to the power generation of the engine; when the temperature is judged to be overheated due to the power generation of the engine, the temperature is cooled through the ethanol cooling liquid. The overheating of the generator caused by power generation is mainly caused by the fact that the temperature of a generator controller is increased when power is generated, and the temperature is reduced through cooling liquid. However, when the temperature exceeds 65 degrees, the coolant temperature rises and the pressure rises to 40mpa, and the charging voltage is depressed while the water flow rate rises and the power supply is stopped. In addition, the power generation overheating can also be caused by air intake failure or overheating caused by gasoline combustion in a cylinder, and the speed of the vehicle can be reduced to lower the temperature firstly besides stopping power generation.

When the power generation input rises from 340V45A to 380V or 110A continuously keeps for 30 minutes or 380V110A and below 300A continuously keeps for 30S, the charging fault is judged, at the moment, a fault limp home mode is entered, and the power device is limited through the combination switching of the high-voltage distribution PDU relay. On the premise of ensuring that the cold chain vehicle compartment is powered by the vehicle battery, the vehicle battery drives the motor to drive the vehicle to slowly run, and the running speed of the vehicle is 30km/h-40 km/h. At the same time, power to other vehicle accessories may be turned off for further power savings. In addition, at the time of a charging failure, the pedal braking response hierarchy is set to the highest level, i.e., the first level, for the purpose of receiving power to some extent. The energy generated when the pedal is stepped on is converted into electric energy to be stored in the storage battery. The stored electric energy can provide power for starting and running of the vehicle, and can also charge a storage battery of the vehicle or supply power for power consumption equipment in the vehicle. The pedal braking response is divided into three stages, wherein the first stage is used for recovering 80% -90% of pedal braking electric quantity, the second stage is used for recovering 50% -80% of electric quantity, and the third stage is used for recovering 20% -50% of electric quantity.

Further, in order to prevent circuit faults, overcurrent protection is set, specifically, the current of 220V-380V input voltage of the generator ECU can be automatically set to be the highest 150A, the voltage range of the output voltage of the battery pack through the GCU is 200V-750V, the highest current continuously works in 300A and 30S to start the overcurrent protection, a relay is closed, and breakdown of devices is avoided. Meanwhile, the voltage is gradually increased from 336V42A, so that the compensation efficiency is maximized.

Further, in order to recover redundant energy, parking energy recovery is carried out when the logistics vehicle is parked, the whole vehicle is stopped in 1S through the motor, energy is returned to the BMS from the MCU after NVH calibration or absorbed by the wheel side brake EPS, and unsmooth emergency brake and emergency stop can occur if the whole vehicle is stopped in 20-30 milliseconds.

The technical scheme provides a safety control method for the extended-range electric cold-chain logistics vehicle, which divides safety faults into mechanical faults and circuit faults, judges whether the vehicle belongs to the mechanical faults or the circuit faults according to fault code information when the vehicle has the safety faults, and if the vehicle belongs to the circuit faults, the power generation of the extended-range power generation device needs to be stopped in a limited way for a protection circuit, and then specific fault reasons are analyzed to solve the problems. When a mechanical failure occurs, since it is not certain which module has a problem, further analysis of the cause of the failure and re-solution are required. Particularly, when the default of a system capable of automatically recovering the limit mechanical characteristics is not mechanical fault, for example, when the engine speed is greater than 6500 revolutions, the cylinder stroke and the stroke are normal when the oil loss is over the response time, and when the engine speed is recovered to 1500 revolutions under 10 times of air pressure compression ratio, if the oil can be re-eaten, the fault is not reported. The normal use of the logistics vehicle is ensured by judging the fault type so as to timely process the fault.

It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.