Main Controller Function Specifications for Pure Electric Vehicles
VCU Function
VCU is the core control component of the entire car, equivalent to the brain of the car.
The VCU collects accelerator pedal signals, brake pedal signals and other component signals, and after making corresponding judgments, controls the actions of the lower component controllers to drive the car to normal driving.
1.Car drive control
According to the driver's operating intention, vehicle status and other working conditions, the working status and power output of the motor are reasonably controlled to meet the requirements of driving conditions. Including acceleration and deceleration, constant speed, braking and reverse working conditions.
2. Braking energy feedback control
Based on the brake pedal and accelerator pedal information, vehicle driving information, and power battery pack status information, the braking mode is determined, the braking torque distribution is calculated, and part of the energy is recovered.
3. Vehicle energy optimization
Through the coordination and management of the electric vehicle's motor drive system, battery management system, transmission system and other on-board energy-consuming components, optimal energy utilization can be obtained and use can be extended.
4. High-voltage accessory control
The VCU controls functions such as cooling fans, water pumps, and air conditioners based on vehicle status, vehicle and driver request information, and determines the opening and closing of high-voltage accessory functions.
5.Network management
Organize information transmission, network status monitoring, network node management, etc.
6. Vehicle status monitoring
The status information and fault diagnosis information of the respective jurisdiction objects are sent to the bus, and are displayed by the vehicle controller through the comprehensive digital instrument.
MCU Functions
The MCU obtains the needs of the entire vehicle from the vehicle controller, obtains electric energy from the power battery pack, modulates it through its own inverter, obtains the current and voltage required to control the motor, and provides it to the electric motor, so that the motor's speed and torque meet the requirements of the entire vehicle. requirements.
1.CAN communication
The motor system has high-speed CAN network (power network CAN) communication function.
It can correctly send, receive and parse CAN messages according to the content of the vehicle CAN protocol, and effectively implement single-unit and vehicle function strategies.
2. Energy conversion
(1) Convert direct current to three-phase alternating current: convert electrical energy into mechanical energy, which is used to drive the vehicle.
(2) Convert three-phase alternating current to direct current: convert mechanical energy into electrical energy to realize braking energy recovery and improve vehicle cruising range.
3. Torque execution
Positive torque execution: When the driver steps on the accelerator, the vehicle controller sends a positive torque value to the motor controller, and the motor system drives the vehicle to run.
Negative torque execution: When the driver steps on the brakes, the vehicle controller sends a negative torque value to the motor controller, and the motor system feeds energy back to the power battery to realize energy recovery.
4.Discharge function
The motor controller contains large-capacity capacitors. Considering that the long self-discharge time of the capacitors poses a high-voltage safety risk, the motor system must have a discharge function.
5.Safety protection function
The motor system has safety protection functions such as fault detection, fault reminder, and fault handling.
