Braking energy recovery control method for electric bus

Abstract

The invention discloses a braking energy recovery control method for an electric bus. The method comprises the following steps: step 1, entering an automatic energy recovery mode; 2, sending the current vehicle speed to a vehicle control module; step 3, calculating a target vehicle deceleration and sending the target vehicle deceleration to the vehicle control module, and sending a brake pedal signal to the vehicle control module; step 4, sending the electric quantity of a battery to the vehicle control module, and calculating the maximum available recovery torque at different vehicle speeds;step 5, sending the maximum available recovery torque to a motor controller and executing the maximum available recovery torque by a motor; 6, feeding back the actual energy recovery torque to the vehicle control module and an electronic brake control system; 7, feeding back a real-time deceleration signal to the vehicle control module; and 8, adjusting the energy recovery torque. The reasonable energy recovery torque is adjusted according to the fluctuation of the whole vehicle servicing mass; when the servicing mass is low, the small energy recovery torque is requested, otherwise, the largeenergy recovery torque is requested, so the energy recovery rate is increased, and the braking comfort is considered.

Description

technical field [0001] The invention relates to a control method for a new energy electric bus, in particular to a control method for braking energy recovery of an electric bus. Background technique [0002] Please see attached figure 1 , at present, the control method for braking energy recovery in electric buses is: according to the speed of the electric bus and the depth of the brake pedal stepped on by the driver, while considering the power of the high-voltage battery and the maximum available recovery torque of the motor, the vehicle control module 1 issues a brake The dynamic recovery torque is given to the motor controller 2, and the motor controller 2 controls the motor 3 to realize the required recovery torque. At this time, the motor 3 is in the power generation mode and can generate current to the high-voltage battery terminal as energy storage. If the braking torque of the motor is not enough to achieve the desired deceleration, then the electronic brake contro...

AI Technical Summary

Problems solved by technology

Therefore, the problem caused by using the energy recovery control method of the prior art in the actual application scene of the electric bus is: when the electric bus is in the no-load mode, the driver's driving request reaches a desired deceleration and steps on the brake pedal. Due to the small weight of the vehicle, the same regenerative braking torque request will lead to greater deceleration, and the deceleration comfort of passengers will decrease; Deceleration, the regenerative braking torque at this time is due to the heavy weight of the vehicle, and the deceleration caused by the same regenerative braking torque request is insufficient. Power torque not only reduces the comfort of deceleration, but also reduces energy recovery due to the intervention of excessive pneumatic braking torque, sacrificing energy consumption and economy

Images