What's the role of an electric car, the part of a traditional car?
High performance control algorithm.The vector control algorithm (field oriented control) is a leap of AC speed regulation technology, it through the orientation of motor flux, realizes the decoupling control of AC motor, the amplitude and the space position of the motor flux vector in dynamic and steady state are controlled, so that the dynamic performance of AC motor speed control, steady state is comparable with the DC motor speed control system, even in some cases beyond the latter. Thus, this algorithm is applied in the field of electric vehicles, electric vehicles to meet with large torque at low speed, ensure that it has good acceleration performance and climbing ability; also meet the wide speed range, so that the electric vehicle has the performance of high speed driving on the road.
Vector converter (motor controller) in the electric vehicle is the DC power source into AC output, drive three-phase motor, and then the electrical energy into mechanical energy to drive the car running. It is the core part of the whole electric drive system, so its control performance is directly related to the reliable and efficient operation of the drive motor, which will affect the power performance of the entire vehicle and the comfort of the passengers.
Optimal energy utilization.The optimal utilization of energy is another basic requirement of electric vehicle, the control system can be as much as possible the use of energy, including the use of overheating and regenerative braking energy, make full use of limited energy. Ability feedback can implement this function. It includes two kinds of vehicle braking capability feedback and vehicle coasting ability feedback. In our state, the drive motor according to the operation of the generator, the vehicle kinetic energy into electricity, can play 3 roles: auxiliary braking; energy recovery to the power battery, thereby prolonging the vehicle mileage; in vehicle heating demand, can directly use this energy heating.
Safe and reliable power on time sequence control.Motor controller, power, according to certain timing control, otherwise it will cause damage to the controller. When the driver presses the motor controller switch button, motor controller is connected to the vehicle controller switching command closed after the precharge contactor, the battery group through the precharge resistor to capacitor charging slow motor controller, when the motor controller detects the DC bus voltage reaches the rated input voltage of 90%, closed motor controller contactor, and cut off the precharge contactor at this time, the main electric motor controller completely to battery group, completed the main electrical power on the process.
The main advantage of inverter products in electric vehicles lies in:1, reliability: three heavy over-current protection, three heavy voltage protection, three heavy drive protection, ensure the motor controller reliable and stable operation.2, the control strategy is superior: the motor controller adopts vector control technology, which has the advantages of superior performance and high reliability. It is suitable for AC asynchronous or permanent magnet synchronous motors;3, the large capacity output capability: the output end of the motor with no gearbox or reducer, greatly reduces the noise, fault point and mechanical drive system control mode is simple, cost saving, high reliability, good stability of vehicle operation;4, the power performance is good: acceleration performance (0 ~ 15 seconds 50km/h), more good economic performance (0.9 degrees /km @40km/h);5, fault diagnosis and treatment: in order to improve the reliability of the whole vehicle, motor control system must have the function of fault diagnosis, and can save the trouble, convenient after analysis, also through the diagnostic ports can be implemented online debugging motor controller and recording various operating curve facilitates optimization of the whole control system;6, efficient braking energy recovery: give full play to the advantages of pure electric vehicle powertrain system, improve energy utilization, motor control system must have the brake energy recovery function.7, simple: motor controller quality is reliable, and light weight, easy to layout, wiring, maintenance convenience and so on, the industrialization prospect is very good.
