With the development of the economy and society, the traditional energy situation has become increasingly tense. In the context of the increasing energy demand of people, the active development of new energy has become the consensus of all walks of life. New energy vehicles are a typical example of new energy development. One of the biggest features of new energy vehicles compared with traditional vehicles is the difference in power systems. The power system is the core of the car and the key to saving energy in the car.
The core equipment in the new energy vehicle power system is the motor and the controller. The performance of the motor and controller directly affects the overall performance of the new energy vehicle. Traditional energy sources are becoming increasingly tense, and new energy sources are on the rise. Strengthening the electromagnetic compatibility test of motors and controllers for new energy vehicles will help to ensure the quality of new energy vehicles and improve the performance of new energy vehicles.
1 reasons for new energy vehicle power system compatibility test
At present, China's new energy vehicle power system mainly uses the drive motor system, which has great advantages compared with the traditional internal combustion engine system. At present, China's new energy vehicle power system is still in the research stage and has not been popularized. In normal work, the new energy vehicle power system emits strong radiation and electromagnetic interference due to the beating of the current in a very short time and the rapid movement of the high-power semiconductor switch. For example, the edge-gate bipolar transistor is turned on and off, although it is only a few tens of nanoseconds, but it can generate strong electromagnetic interference in these tens of nanoseconds. The electromagnetic interference of the power system will seriously affect the performance of new energy vehicles and seriously affect the power system of new energy vehicles. Therefore, in order to reduce electromagnetic interference, we must strengthen the electromagnetic compatibility test.
At present, China's new energy vehicle compatibility testing technology is not very mature, and there is still a big gap compared with other countries. Most of China's new energy vehicle power system compatibility tests use traditional internal combustion engine drive systems and weak current system standards for testing. There is no complete scientific new energy power system compatibility test standard in China. This is a place worthy of our reflection.
2 power system electromagnetic compatibility test content
The electromagnetic compatibility test for the new energy vehicle power system mainly refers to two aspects: one is the harassment test; the other is the immunity test. To achieve scientific testing, it is necessary to accurately grasp the meaning of these two aspects of testing, and strictly follow the relevant national standards for testing.
2.1 Harassment Test The harassment test mainly refers to the test of the protection ability of personnel within a certain distance. The standard used in the current harassment test is GB14023-2006. Compared with the original standard, the standard has been adapted to some requirements of new energy vehicles, but the standard is the standard of internal combustion engine.
Testing with this standard cannot be done scientifically. The standard calculates the operating state of the measured object mainly through kilometers per hour. On the contrary, the new energy vehicle is measured according to the revolution every minute. There are significant differences between the two calculation standards. In addition, the difference in arrangement is also the main reason for the failure of the compatibility test. There is a clear difference in the test of the power system alone and the power system installed on the new energy vehicle. The arrangement of the two is significantly different. This will make the compatibility test meaningless.
2.2 Immunity test The anti-interference test mainly refers to the test of the anti-electromagnetic radiation capability of the electronic component of the motor vehicle. At present, the reference standard for China's immunity test is GB/T17619-1998. The standard specifies the immunity limits and test methods. Since the electromagnetic compatibility test environment of the drive motor system is almost the same as that of the conventional vehicle compatibility test, it is also feasible to use GB/T17619-1998 for reference.