AT hybrid electric vehicle-based hybrid power system and sliding brake energy recovery control method thereof

Abstract

The invention relates to an AT hybrid electric vehicle-based hybrid electric system and a sliding brake energy recovery control method thereof, belonging to the field of control of hybrid electric vehicles. Aiming at the existing defects, the invention provides a hybrid electric system which can ensure good driving comfort, high energy recovery and high reliability of a vehicle, and a sliding brake energy recovery control method thereof. The method comprises: according to the vehicle speed, states of an accelerator pedal and a brake pedal, the charging state of a high-voltage battery and the working state of an ABS, determining the state of the vehicle and performing brake energy recovery; determining the brake torque of a base motor according to the opening of the brake pedal and the actual gear of a gearbox; correcting the brake torque of the base motor according to the transmission efficiency of the gearbox and oil temperature; and performing one-stage torque limiting according to the current external output torque capability of the motor; feeding the charging current of a BMS back to an MCU; and the MCU performing two-stage torque limiting on the brake torque of the motor. TheAT hybrid electric vehicle-based hybrid electric system and the sliding brake energy recovery control method thereof are mainly used for controlling the sliding brake energy recovery of the hybrid electric vehicle.

Description

technical field [0001] The invention belongs to the field of hybrid vehicle control, and in particular relates to a hybrid system based on an AT hybrid vehicle and a control method for energy recovery during coasting braking thereof. Background technique [0002] In traditional vehicles, the kinetic energy of the vehicle is mainly converted into heat energy through mechanical friction during coasting braking, and this part of energy cannot be reused. On a hybrid vehicle, when coasting and braking, the kinetic energy can be converted into electrical energy and stored in the high-voltage battery through the electric motor. When the driver depresses the accelerator pedal and the vehicle needs power again, the electric energy can be released and re-converted through the electric motor. is the kinetic energy of the vehicle. The main purpose of braking energy recovery is to recover as much energy as possible during coasting braking to increase the mileage of the vehicle, but it i...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the defects of poor vehicle driving comfort, less energy recovery and poor reliability during coasting braking of the existing hybrid power system vehicle, and provides a hybrid power system capable of ensuring good vehicle driving comfort, more energy recovery and high reliability. System and its coasting braking energy recovery control method

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