CN202511974U - Matching evaluating test bed for fully electric automobile power-driven system - Google Patents

Abstract

The utility model relates to a matching evaluation test bed for a pure electric vehicle power drive system. Including CAN bus, USB-To-CAN card 1, vehicle controller, information unit 1, information unit 2, motor controller, information unit 3, battery management system, charger controller, information unit 4, data acquisition system and USB-To-CAN card 2, industrial computer 1, industrial computer 2, etc. Using the AC power dynamometer in the pure electric vehicle power drive system matching evaluation test bench to simulate the cycle of specific road conditions, the matching scheme of the pure electric vehicle powertrain system can be optimized, and the optimal transmission system parameters can be determined by optimizing the parameters of the transmission system. Power drive system matching scheme. It can also test the power drive system scheme of the actual vehicle application to evaluate the adaptability of the electric vehicle powertrain system and road conditions.

Description

Pure electric vehicle power drive system matching evaluation test bench

technical field

The utility model relates to an automobile power test bench, in particular to a pure electric automobile power drive system matching evaluation test bench.

Background technique

The parameter matching of the electric vehicle power drive system and the optimization of the controller control strategy require a real test environment. Some key technologies, especially the characteristics of the key components of the power drive system under extreme conditions, need to be tested on the test bench. At present, the existing electric vehicle test bench is mainly for motor performance test or battery pack performance test. Due to the use of eddy current dynamometer, the test bench cannot simulate the urban road conditions, and the motor performance can only test the driving condition; when the energy feedback test A mechanical flywheel is mostly used to simulate vehicle inertia, and the number of vehicles that can be simulated is very limited. It can be seen that the current test bench can only perform performance tests on individual components of the powertrain system, and cannot complete the functions of powertrain design scheme optimization, system performance prediction, and key component matching scheme verification.

Contents of the invention

In order to overcome the deficiencies of the above technologies, the utility model provides an electric vehicle power drive system matching evaluation test bench. The electric vehicle power drive system matching evaluation test bench is based on a battery discharger with continuously adjustable current, an AC power dynamometer, etc. The equipment can select the key components of the electric drive system of electric vehicles, test and analyze the characteristics of key components, and can match and optimize the power drive system scheme of electric vehicles.

The technical solution adopted by the utility model to overcome its technical problems is:

The pure electric vehicle power drive system matching evaluation test bench includes CAN bus, USB-To-CAN card 1 connected to CAN bus, vehicle controller, information unit 1, information unit 2, motor controller, information unit 3, The battery management system, the charger controller, the information unit 4, the data acquisition system and the USB-To-CAN card 2, the industrial computer 1 is connected to the USB-To-CAN card 1, the vehicle status information collection module is connected to the vehicle controller, The dynamometer control system is connected to the information unit 1, the speed torque measuring instrument is connected to the information unit 2, the driving motor is connected to the motor controller and the data acquisition system, the AC power dynamometer is connected to the driving motor through the speed torque sensor, and the AC power dynamometer is connected to the driving motor through the speed torque sensor. The electric dynamometer is connected to the dynamometer control system, the speed torque sensor is connected to the speed torque measuring instrument, the test power supply is connected to the information unit 3, the battery pack is connected to the battery management system, and the charger is connected to the charger controller and the battery group, battery pack and test power supply are connected to the switching device, the switching device is connected to the motor controller and data acquisition system, the battery discharge instrument is connected to the information unit 4, the display device is connected to the industrial computer 2, and the industrial computer 2 is connected to the USB-To- CAN card2.

The above information unit 1 is an RS485 to CAN module.

The above information unit 2 is an RS232 to CAN module.

The information unit 3 above is an RS232 to CAN module.

The information unit 4 above is an RS232 to CAN module.

The above switching device is a DC interlocking double contactor.

The above test power supply is WWL-XQ31 electric vehicle motor controller test power supply.

The beneficial effects of the utility model are: the pure electric vehicle power drive system matching evaluation test bench converts the remote communication information of each device in the test bench into CAN bus communication, and builds a test bench based on the CAN bus. The CAN communication network structure is highly efficient and versatile. It can select the key components of the electric drive system of electric vehicles, test and analyze the characteristics of key components, and can match and optimize the power drive system scheme of electric vehicles, effectively reducing the risk and cost of electric vehicle development.

The AC power dynamometer simulates specific urban road conditions, and the motor controller and test power supply provide energy. Combined with the design goals of electric vehicles, the design of the electric vehicle's drive motor is selected, and the torque characteristics, efficiency characteristics, and overload characteristics of the selected motor are selected. Characteristics and energy feedback characteristics are tested, and finally the drive motor model of the electric vehicle involved is determined.

Use the battery discharger with continuously adjustable current in the test bench to test the current discharge efficiency characteristics, power battery terminal voltage characteristics and open circuit voltage characteristics when the current is discharged at different currents; use the AC power dynamometer of the test bench to work in the speed mode to provide power for power The battery energy feedback characteristic test, combined with the specific urban road conditions and the selected drive motor parameters, can design a reasonable selection of vehicle power battery parameters for the target.

Using the AC power dynamometer in the pure electric vehicle power drive system matching evaluation test bench to simulate the cycle of specific road conditions, the matching scheme of the pure electric vehicle powertrain system can be optimized, and the optimal transmission system parameters can be determined by optimizing the parameters of the transmission system. Power drive system matching scheme. It can also test the power drive system scheme of the actual vehicle application to evaluate the adaptability of the powertrain system and road conditions.

Use this pure electric vehicle power drive system matching evaluation test bench to simulate real road conditions, use the drive motor system as the executive component, conduct actual tests of vehicle drive and braking energy feedback, and develop an efficient energy management strategy for the vehicle controller used in real vehicles .

Description of drawings

Fig. 1 is the system block diagram of the matching evaluation test bench of pure electric vehicle power drive system of the present utility model;

In the figure, 1. CAN bus.

Detailed ways

Below in conjunction with accompanying drawing 1 the utility model is described further.

The pure electric vehicle power drive system matching evaluation test bench includes CAN bus 1, USB-To-CAN card 1 connected to CAN bus 1, vehicle controller, information unit 1, information unit 2, motor controller, information unit 3. Battery management system, charger controller, information unit 4, data acquisition system and USB-To-CAN card 2, industrial computer 1 connected with USB-To-CAN card 1, vehicle status information acquisition module and vehicle controller Connection, the dynamometer control system is connected to the information unit 1, the speed torque measuring instrument is connected to the information unit 2, the driving motor is connected to the motor controller and the data acquisition system, and the AC power dynamometer is connected to the driving motor through the speed torque sensor , the AC power dynamometer is connected to the dynamometer control system, the speed torque sensor is connected to the speed torque measuring instrument, the test power supply is connected to the information unit 3, the battery pack is connected to the battery management system, and the charger is connected to the charger controller And the battery pack, the battery pack and the test power supply are connected to the switching device, the switching device is connected to the motor controller and the data acquisition system, the battery discharge instrument is connected to the information unit 4, the display device is connected to the industrial computer 2, and the industrial computer 2 is connected to the USB- To-CAN card2.

The pure electric vehicle power drive system matching evaluation test bench uses CAN bus 1 to transmit state information and control instructions, refer to the SAE J1939 standard, the communication protocol between the charger and the battery management system and the actual situation of the test bench controller, and the source address of the test bench nodes Definitions are shown in Table 1. Based on the CAN bus 1, the communication control network of the test bench for the matching and evaluation of the pure electric vehicle power drive system is constructed. The network includes industrial computer 1 and industrial computer 2. Machine 2 is directly connected to the bus through Kvaser USB-to-CAN card 2. The industrial computer 1 controls the motor controller, the dynamometer control system, the battery discharger and other equipment to work according to the set mode. The industrial computer 2 completes the data collection during the operation of all equipment on the test bench, and dynamically displays it on the display device in the form of data or curves. Through the information unit, the communication information of the electric vehicle motor controller test power supply, battery discharge instrument, speed/torque sensor and dynamometer system in the test bench is converted into CAN bus 1 communication, which effectively expands the versatility of each device in the test bench.

node name address Industrial computer 1 (driving display) 40 (0X28) vehicle controller 36(0x24) Motor Controller 130(0x82) battery management system 244(0xF4) Charger Control System 229(0xE5) Dynamometer Control System 131(0x83) Test power 132(0x84) Industrial PC 2 133(0x85) Battery discharge meter 134(0x86) data collection system 135(0x87)

Table 1 Allocation table of CAN network node addresses of the test bench

The above information unit 1 is an RS485 to CAN module, and the above information unit 2, information unit 3, and information unit 4 are all RS232 to CAN modules.

The switching device above is a DC interlock double contactor

With reference to the national standard GB18333.1-2001 and the automotive industry standard QC/T 743-2006, the electric vehicle battery pack and battery management system tests mainly include:

(1) Test the discharge characteristics and consistency parameters of the battery pack under different currents;

(2) According to the performance requirements of pure electric vehicles, test the working characteristics of the battery pack under actual road conditions and the performance of the battery pack under some extreme conditions (such as energy feedback and short-term high-current output);

(3) Test the battery management system temperature, voltage and current monitoring, SOC calculation and alarm protection functions.

和开路电压

，通过计算得到电池组效率特性，据此可进行设计电动汽车动力驱动系统中动力电池组的选择。 When carrying out the above (1) and (3) tests, the battery discharger is used as the load of the power battery pack to test the battery pack and the battery management system, and the industrial computer 1 sends a message 0xCF11528 through the CAN bus 1 to set the discharge stage of the battery discharger , Each stage of discharge time and discharge current and other parameters, and issue commands through CAN bus 1 to control the battery discharger to start and stop working. The information unit 4 analyzes the CAN message information, converts it into RS232 information recognized by the battery discharge instrument through the RS232 to CAN module, and controls the battery discharge instrument to work according to the set state. After the battery pack is discharged, the industrial computer 1 sends a message 0x1806E5F4 to the charger controller, and the charger controller sets parameters such as the allowable charging voltage and charging current of the charger to charge the battery pack. During the charging and discharging process of the battery pack, the battery management system tests the parameters such as the voltage and temperature of the single battery, the total voltage of the battery pack, the total current, and the SOC of the battery pack. The battery management system packs the data into a valid message and sends it to the industrial computer 2 Display the working process of the battery pack in real time, and verify the function of the battery management system accordingly. When carrying out the above (2) test, the battery pack is used as the power supply for driving the motor and the motor controller through the DC interlocking double contactor, and the industrial computer 1 controls the work of the dynamometer system through the information unit 1, and the information unit 1 receives the industrial computer 1 The sent CAN message is converted into 485 bus information recognized by the dynamometer control system, and sent to the dynamometer control system based on the Modbus protocol to control the AC power dynamometer to simulate the acceleration and uphill of the electric vehicle under actual road conditions and road resistance when driving at a constant speed and the power provided by the vehicle inertia when going downhill and decelerating. The system operates jointly to test the battery pack and battery management system; the data acquisition system collects the battery pack, battery discharger, AC power dynamometer and test The relevant parameters of the power machine control system, and send the data to the industrial computer 2 through the CAN bus 1. The industrial computer 2 displays the relationship curve between each parameter and time in real time through the display device, and can export the test data, and carry out the collected data. Processing analysis, according to the battery pack terminal voltage obtained by the test

and open circuit voltage

,pass The efficiency characteristics of the battery pack are calculated, and based on this, the selection of the power battery pack in the power drive system of the electric vehicle can be designed.

Referring to the national standard GB/T 18488-2006 electric vehicle motor and its controller, electric vehicle motor and its controller test specification and electric vehicle motor and its controller technical specification, the test bench drive motor and controller test mainly includes:

(1) Drive motor characteristic curve test, including drive motor torque characteristics and efficiency test test and high-efficiency zone test, and test the influence of temperature on drive motor efficiency.

(2) The short-term overload characteristic test of the drive motor, the maximum operating speed test and the overspeed test can be carried out.

(3) Combined with the AC power dynamometer, the dynamometer simulates the downhill, deceleration and braking conditions of the electric vehicle when driving on the road, and performs the regenerative energy feedback test.

、驱动电机转速

和转矩信息，通过计算得到驱动电机系统效率，根据电机系统效率特性确定设计车辆动力驱动系统中驱动电机的选择。转速转矩测量仪输出信息为RS232总线信息，信息单元2接收转速转矩测量仪信息，并将RS232信息转化成CAN总线信息，发送报文至工控机2。进行上述(3)试验时，为了真实测试驱动电机和动力电池特性，工控机1设定交流电力测功机工作在转速模式下，采用交流电力测功机模拟车辆下坡、减速及制动时的车辆惯性能量，驱动电机此时工作在发电模式，对电池组进行充电，测试车辆电力驱动系统能量回馈特性。 When carrying out the above (1) and (2) tests, the electric energy can be provided by the test power supply through the DC interlocking double contactor to make the driving motor run, and carry out the characteristic test of the driving motor. During the test, the industrial computer 1 sends a message 0xCF11728 to set parameters such as the operating voltage and current of the test power supply, and controls the operation of the test power supply through the information unit 3. The data acquisition system collects the motor temperature 1, motor temperature 2, and drive Motor bus voltage and bus current and other information, the speed and torque measuring instrument collects the speed and torque information of the driving motor in real time through the speed and torque sensor connected to the driving motor. The information collected by the data acquisition system converts the RS232 information into CAN bus information through the CAN bus 1 and the information of the speed torque measuring instrument through the RS232 to CAN module, and sends it to the industrial computer 2 through the CAN bus 1, and the industrial computer 2 is driven by the display device Real-time display of motor working process parameters, and according to the collected drive motor bus voltage , bus current

, Drive motor speed

and torque information via The efficiency of the driving motor system is calculated, and the selection of the driving motor in the designed vehicle power drive system is determined according to the efficiency characteristics of the motor system. The output information of the rotational speed and torque measuring instrument is RS232 bus information, and the information unit 2 receives the information of the rotational speed and torque measuring instrument, converts the RS232 information into CAN bus information, and sends a message to the industrial computer 2 . When performing the above (3) test, in order to truly test the characteristics of the drive motor and power battery, the industrial computer 1 sets the AC power dynamometer to work in the speed mode, and uses the AC power dynamometer to simulate the vehicle downhill, deceleration and braking. The inertial energy of the vehicle, the drive motor is working in the power generation mode at this time, charging the battery pack, and testing the energy feedback characteristics of the vehicle's electric drive system.

The power drive system of pure electric vehicles should be considered as a whole. The battery pack, drive motor, vehicle controller, battery management system and motor controller cannot be isolated to test a certain part separately. The battery pack and battery management system should be considered comprehensively. , drive motor and motor controller, vehicle controller, and the impact of vehicle load on the performance of the powertrain system and their relative importance can provide an important basis for the matching optimization of the electric vehicle powertrain and the design of the electric vehicle.

The GPRS-based remote data collection method realizes the remote collection of road driving data of electric vehicles through the vehicle-mounted data collection terminal, provides a basic data source for determining the driving conditions of electric vehicles, conducts statistical analysis on the collected data, and finally synthesizes the target road conditions.

According to the pure electric vehicle design goals and target road conditions, calculate the rolling resistance, air resistance, slope resistance and acceleration resistance of the electric vehicle when driving on the target road, and use the AC power dynamometer to simulate the action on the driving motor when the car is running The actual load on the shaft reproduces the driving conditions of electric vehicles on the road; the driving motor is powered by the battery pack and runs at the speed set in the working conditions. At the same time, the overall efficiency and energy consumption rate of the pure electric vehicle power drive system can be calculated, so as to achieve the purpose of evaluating the performance of the powertrain system, and can be used for the existing electric vehicle powertrain. Make a judgment on the adaptability of the result and the actual road conditions.

Use an AC power dynamometer to simulate the road conditions of electric vehicles. When simulating vehicle acceleration and driving at a constant speed, set the resistance torque value of the dynamometer as the vehicle load to change with time; when simulating vehicle deceleration, downhill and braking, set The rotational speed value of the fixed dynamometer changes with time to provide power, and the real-time simulation of the actual road driving conditions of the pure electric vehicle is realized through the dynamometer control system. The vehicle controller collects the accelerator pedal, brake pedal, vehicle gear position and key switch information of the vehicle in real time through the vehicle status information acquisition module. The vehicle controller obtains the torque demand value according to the driving demand of the driver, and sends a message 0x18FF0524 to control the drive The motor works, and the driving motor system is used as the executive part of the electric vehicle to receive the command of the vehicle controller, and the vehicle control strategy can be developed in a real environment, which saves costs, shortens the development cycle of new models, and provides a basis for the development of the vehicle control strategy. Optimization studies provide a fast and efficient test platform.

The above-mentioned test power supply can be used for WWL-XQ31 electric vehicle motor controller test power supply, which is specially designed for electric vehicle motor test, and can simulate the electric vehicle battery pack for driving motor performance, motor controller test and braking energy Recovery test; when simulating vehicle deceleration and braking energy feedback, the driving motor will be in a braking state, causing the voltage of the power bus to rise sharply. The power supply is designed with a discharge function, which can stabilize the voltage at the set value, ensuring that the motor controller and The electric vehicle motor controller test power supply is safe; the electric vehicle motor controller test power supply has a remote control function, which can set parameters such as output voltage and monitor parameters such as voltage and current during operation in real time.

Claims (7)

1. A pure electric vehicle power drive system matching evaluation test bench, characterized in that it includes a CAN bus (1), a USB-To-CAN card 1 connected to the CAN bus (1), a vehicle controller, and an information unit 1. Information unit 2, motor controller, information unit 3, battery management system, charger controller, information unit 4, data acquisition system and USB-To-CAN card 2, industrial computer 1 and USB-To-CAN card 1 connected, the vehicle state information acquisition module is connected with the vehicle controller, the dynamometer control system is connected with the information unit 1, the rotational speed torque measuring instrument is connected with the information unit 2, the driving motor is connected with the motor controller and the data acquisition system, and the AC power The dynamometer is connected to the driving motor through the speed torque sensor, the AC power dynamometer is connected to the dynamometer control system, the speed torque sensor is connected to the speed torque measuring instrument, the test power supply is connected to the information unit 3, and the battery pack is connected to the The battery management system, the charger is connected to the charger controller and the battery pack, the battery pack and the test power supply are connected to the switching device, the switching device is connected to the motor controller and the data acquisition system, the battery discharger is connected to the information unit 4, and the display device is connected to For the industrial computer 2, the industrial computer 2 is connected to the USB-To-CAN card 2. 2. The pure electric vehicle power drive system matching evaluation test bench according to claim 1, characterized in that: the information unit 1 is an RS485 to CAN module. 3. The pure electric vehicle power drive system matching evaluation test bench according to claim 1, characterized in that: the information unit 2 is an RS232 to CAN module. 4. The pure electric vehicle power drive system matching evaluation test bench according to claim 1, characterized in that: the information unit 3 is an RS232 to CAN module. 5. The pure electric vehicle power drive system matching evaluation test bench according to claim 1, characterized in that: the information unit 4 is an RS232 to CAN module. 6. The pure electric vehicle power drive system matching evaluation test bench according to claim 1, characterized in that: the switching device is a DC interlocking double contactor. 7. The pure electric vehicle power drive system matching evaluation test bench according to claim 1, characterized in that: the test power supply is WWL-XQ31 electric vehicle motor controller test power supply.

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