Electric vehicles are currently developing rapidly, but their endurance has always been a thorn in the hearts of users. Regarding the life of electric vehicles, there is no old battery talk here, but about the efficiency of powertrains. Electric vehicles are currently developing rapidly, but their endurance has always been a thorn in the hearts of users. Regarding the improvement of cruising range, the main concern now is mainly on the battery, because the capacity and power density of the battery are the main determinants of the car's life. But as we all know, the battery is only a component that provides power. If the powertrain (electric control, motor, gearbox, etc.) of the car is not efficient, even if the capacity of the battery is increased, the mileage of the electric car cannot be effectively improved. Therefore, testing the efficiency of electric vehicle powertrains is very important. Regarding the efficiency test of the powertrain of electric vehicles, the test analysis method based on the efficiency MAP map is mainly used at present. Map map test object The specific test method has detailed records under the high-efficiency work area test item of GB T 18488-2015 Drive Motor System for Electric Vehicles: · The drive motor system under test is in hot working condition. The DC bus operating voltage of the drive motor controller is rated voltage, and the drive motor system can work in electric or feed state. · Test at different speeds and different torque points, record the speed and torque of the drive motor shaft end as required, and drive the motor controller DC bus voltage and current, motor input AC voltage and current parameters. · Calculate the efficiency value of each test point according to the formula of efficiency = output power / input power · According to the requirements of 5.4.9.2 of GB/T 18488.1-2015 for efficient working area, the number of qualified test points is counted, and the ratio of the value to the total number of test points is the ratio of efficient work area. · Encourage efficient work areas for drive motors, drive motor controllers and drive motor systems Electric vehicle drive system efficiency MAP map Electric vehicle drive system efficiency MAP map (stereo) In general, the larger the range of reddish color in the MAP map test results, the wider the distribution of the high-efficiency area of ​​the motor, the more energy-efficient under different operating conditions, and the better cruising range. In addition, as you can see in the above figure, the efficiency of the motor in the low-speed zone is relatively poor, which is also a difficult problem for the motor. In view of this, many car manufacturers now adopt the motor + gearbox solution. Through the conversion of the gearbox, the motor is kept running in the high-speed zone to ensure the efficiency under the conditions of high torque output such as starting and taxiing. The gearbox industry is also very mature, and the efficiency loss of the gearbox is better than the low conversion efficiency of the motor at low speeds. Of course, the gearbox itself also has weight, which also increases the load on the vehicle to a certain extent. This problem needs to be weighed by the specific car design engineer. Based on the in-depth exploration and long-term accumulation of the motor and electric vehicle industry, Zhiyuan Electronics successfully integrated the special test project for new energy vehicles on the MPT series motor test system - MAP map test, providing excellent performance for the majority of electric vehicle powertrain designers. Test solution. According to GB/T 18488-2015 test standards for drive motor systems for electric vehicles, MAP map testing of new energy vehicle drive systems is required to obtain the respective efficiency characteristics and efficiency of the electric control, motor and system under electric and braking conditions. District distribution. The actual test results of the MAP map are as follows: The MPT motor test system has built-in MAP automatic test function, which can automatically control the load and the tested motor to load corresponding conditions according to the preset loading conditions of the user, obtain the efficiency under different working conditions, and finally integrate the massive test data into one. The MAP map intuitively analyzes the efficiency characteristics and efficient area distribution of the motor for the user.
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