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The whole vehicle energy distribution and control management system consists of the power battery pack, battery management system (BMS), discharge and charging interfaces and their control. In order to obtain the maximum driving range and the first service safety function, the energy distribution and management system must reasonably and efficiently distribute the limited energy according to the actual driving conditions of the electric vehicle and the SOC of the battery pack and other parameters, so as to make the safe and efficient driving while maximizing the driving range of the electric vehicle on one charge.
Vehicle driving control system is composed of vehicle driving controller, motor drive control system, energy recovery system, transmission control system and auxiliary control system, etc. connected through bus system.
(1) Vehicle driving control function pure electric vehicle's power motor must output driving or braking torque according to the driver's intention. When the driver depresses the accelerator pedal or brake pedal, the power motor has to output a certain amount of drive torque or regenerative braking torque. The higher the pedal opening, the higher the output torque of the power motor. Therefore, the vehicle controller has to receive the pedal signal and convert it into a torque output requirement for the power motor. This function is the basic function of the whole vehicle controller.
2) Vehicle multi-master flat can Bus control management in electric vehicles to CAN bus application as a matter of course. The vehicle controller is one of the many controllers of electric vehicles and is a node in the CAN bus. It is responsible for the organization and transmission of information, the monitoring of the network status, the management of the network nodes and the diagnosis and processing of network faults. The data collected by each sensor is converted into digital signals by A/D converter and transmitted to the controller; some switching signals such as start and stop switches and gear switching switches are also transmitted to the controller. The controller realizes the command issuance and information sharing among the modules through CAN bus.
The motor drive control system includes the high-power AC asynchronous motor controller and power inverter as well as the motor itself, which completes the drive control task under the normal driving conditions of the electric vehicle and is the core issue of the electric vehicle movement.
The energy recovery system mainly converts the mechanical energy of the vehicle braking into electrical energy and stores it in the battery pack to realize the recovery of braking energy. The intelligent gearbox is used in the system, which consists of two parts: deceleration and speed-up functions, and acts as a decelerator during normal driving to improve the traction drive performance of the EV drive system. It switches to the speed-up mode during braking to perform braking energy recovery in a wider speed range and improve the energy recovery efficiency. The gearbox controller cooperates with the switching process of the integrated motor to achieve the switching in millisecond magnitude. The gear shift function under normal driving conditions of the electric vehicle is also controlled by this system.
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