Electric vehicle longitudinal motion control method and device based on deceleration strip detection

Abstract

The invention discloses an electric vehicle longitudinal motion control method and device based on deceleration strip detection. The method comprises the following steps: detecting a road deceleration strip, calculating the time when a vehicle arrives at the deceleration strip in real time, and recording the time as first time; when the first time is smaller than a preset threshold value, determining position information of the vehicle according to dynamic changes such as the longitudinal acceleration of the vehicle, the change rate of the longitudinal acceleration and the difference value between the wheel speed of a driving wheel and the wheel speed of a driven wheel of the vehicle; and on the basis of the information, when the position information of the vehicle is that the vehicle passes through the deceleration strip, determining the motion state of the vehicle according to accelerator pedal information and brake pedal information of the vehicle, the driving torque of the driving wheel end and the braking torque of the driving wheel end, and enabling a motor to execute corresponding operation according to the motion state of the vehicle. Therefore, the vehicle passes through the deceleration strip by adopting different strategies. According to the technical scheme, the safety and comfort of the electric vehicle passing through the deceleration strip are improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle control, in particular to a method and device for controlling the longitudinal motion of an electric vehicle based on speed bump detection. Background technique [0002] Compared with traditional fuel vehicles, electric vehicles have the characteristics of fast loading rate of driving torque, energy recovery braking, and small moment of inertia of motors. In the vehicle design stage, vehicle manufacturers consider factors such as the acceleration of electric vehicles and the improvement of cruising range, and tend to increase the slope of the driving torque load as much as possible when the vehicle accelerates, and when the vehicle is coasting or braking, the coasting The energy recovery torque or braking energy recovery torque should be as large as possible. Based on the above-mentioned characteristics and current situation, there will be certain discomfort and even driving risks when a...

AI Technical Summary

Problems solved by technology

Based on the above-mentioned characteristics and current situation, there will be certain discomfort and even driving risks when an electric vehicle passes the speed bump on the road. Due to factors such as small inertia, the driving wheel will have a large positive slip rate. When the wheel crosses the speed reduction belt and falls back to the ground, the positive slip rate will be instantly suppressed, which will cause the whole vehicle to vibrate or even break the drive shaft; when the vehicle slides Or when braking through the deceleration belt, in the gap between the wheels, due to factors such as excessive braking torque and small moment of inertia of the motor, the driving wheel will have a large negative slip rate. When the negative slip rate reaches the ABS activation threshold, When the ABS function is triggered, the coasting energy recovery torque or braking energy recovery torque will exit. When the wheel falls over the deceleration belt and falls back to the ground, part of the deceleration will be lost due to the withdrawal of the energy recovery torque, and the driver will have a vehicle rushing forward. I can't even stop the feeling

Images