Anti-hill-slip control method for battery electric vehicles

Abstract

The invention provides an anti-hill-slip control method for battery electric vehicles. A vehicle control unit separately collects vehicle control signals and sends operation commands to a motor controller according to the collected signals; the motor controller drives a motor system to run via a power module and, at the same time, feeds the actual operation state of the motor system back to the vehicle control unit via a sensor; the vehicle control unit makes the vehicle enter an anti-hill-slip control mode according to the collected signals; in the mode, the motor system outputs hillhold torque and maintains the state for 3 seconds; the hillhold moment reduces by 20Nm every other 5 seconds until the vehicle makes micro-distance movement and the driver makes the vehicle stop by using a brake pedal or a hand brake; when the vehicle control unit detects that a brake pedal signal or a hand brake signal is invalid and the torque required by the vehicle is greater than the hillhold torque, the anti-hill-slip control mode is stopped. The method realizes vehicle anti-hill-slip control via optimization of control strategies and thus prevents the damage risk of a motor system and the shaking of a vehicle during hillhold of the vehicle.

Description

technical field [0001] The invention relates to a control method for anti-slip slope of a pure electric vehicle. Background technique [0002] With the development of the society, there are more and more vehicles of all kinds, resulting in more and more crowded roads, which brings various difficulties to the driving of the vehicles. The more common one is the sliding slope of the vehicles on the ramp, which poses a challenge to the driver's operation. higher requirements. The power of pure electric vehicles comes from the electric energy of the battery pack, and the motor system drives the vehicle to run. However, the motor drive system does not have a locking mechanism. Therefore, when the vehicle is parked or started on a slope, the driver needs to step on the accelerator and at the same time Braking operation, otherwise it is easy to slip and slope, and the safety is poor. [0003] In the prior art, some anti-slopes of pure electric vehicles rely on inclination sensors ...

AI Technical Summary

Problems solved by technology

The power of pure electric vehicles comes from the electric energy of the battery pack, and the motor system drives the vehicle to run. However, the motor drive system does not have a locking mechanism. Therefore, when the vehicle is parked or started on a slope, the driver needs to step on the accelerator and at the same time Brake operation, otherwise it is easy to slip and slope, and the safety is poor

[0003] In the prior art, some anti-slopes of pure electric vehicles rely on inclination sensors to detect slope angles to prevent slopes, which increases the cost of hardware; , but in practical applications there may be a risk of low-speed vehicle vibration and damage to the motor system

[0004] Chinese patent document CN101817313A discloses a safety start control system for electric vehicles on slopes, which includes a vehicle controller, a motor controller, an automatic transmission controller and a handle gear acquisition system; the vehicle acceleration is calculated by the vehicle controller to obtain Slope information, according to the slope information to obtain the motor torque, those skilled in the art are familiar with, in the process of calculating the slope information according to the vehicle acceleration, a lot of simplifications and assumptions are made, the calculation accuracy cannot be guaranteed, and it may cause the vehicle Vibration on the ramp

This method firstly increases the cost of hardware; secondly, when the motor is standing on the slope, it will cause unbalanced three-phase current, which may damage the controller or the motor

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