Introduction of new energy vehicle motor electronic control system

There is still huge room for improvement in the performance of new energy electric vehicles. Everyone tends to pay most attention to batteries. As a key component to determine the performance of electric vehicles, this article will talk about motor electronic control in detail.

First, the importance of motor electronic control

As a substitute for traditional fuel vehicles, the new electric vehicle is the “three major electric” system of the electric powertrain system extended on the basis of the traditional “three small electric” (air conditioning, steering, braking). Battery, motor, electronic control. Among them, the motor and electronic control system as an alternative to the traditional engine (transmission) function, its performance directly determines the main performance indicators of electric vehicles such as climbing, acceleration and maximum speed.

At the same time, the working conditions of new energy vehicle motors and electronic control systems are relatively complicated: they need to be able to start and stop frequently, accelerate and decelerate, require high torque at low speed/climbing, require low torque at high speed, and have a large shift range; The power car also needs to handle special functions such as motor starting, motor power generation, and braking energy feedback.

In addition, the energy consumption of the motor directly determines the cruising range under fixed battery capacity. Therefore, electric vehicle drive systems have special requirements in terms of load requirements, technical performance and working environment:

First, the drive motor must have a higher energy density, achieve lighter weight, lower cost, adapt to limited interior space, and have energy feedback capability to reduce vehicle energy consumption;

Second, the drive motor has both high speed and low speed and high torque to provide high starting speed, gradeability and high speed acceleration.

Third, the electronic control system must have high control accuracy, high dynamic response rate, and at the same time provide high security and reliability.

As an important part of the new energy automobile industry chain, the motor electronic control system directly affects the performance and cost of the vehicle. At present, the degree of autonomy in the field of electrical machinery and electronic control is still far behind that of batteries. Some electronic components of electronic control, such as IGBT chips, still do not have complete independent production capacity, and complete vehicle enterprises and parts enterprises with complete system intellectual property rights. Still a minority. With the gradual improvement of the domestic motor electronic control system industry chain, the localization rate of the motor electronic control system has gradually increased, and the growth rate of the motor electronic control market is expected to exceed the growth rate of the new energy vehicle market.