Automatic starting control method of hybrid electric vehicle

Abstract

The invention discloses an automatic starting control method of a hybrid electric vehicle. The automatic starting control method comprises the following steps: S1, when t is greater than t1 and less than t2, a control system does not receive a brake or accelerator signal, the vehicle is driven by a motor separately; S2, when t is equal to or greater than t2 and equal to or less than t3, a driver steps on the accelerator, the control system controls a clutch to a peristalsis point from the opening state after receiving the accelerator stepping signal, the torque Tc(t) of the clutch is enlargedto pull and start an engine, at the same time, the control system controls the output torque Tm(t) of the motor to increase, the actual torque is Ts (t) and keeps unchanged, and the control system adjusts the revolving speed of the engine to the starting revolving speed vq; and S3, when t is equal to or greater than t3 and equal to or less than t4, the clutch is closed from the peristalsis point,the actual torque Ts(t) of the vehicle keeps unchanged, the control system simultaneously gives out a command for adjusting the revolving speed of the engine to enable the revolving speed growth rateof the engine to be consistent with the growth rate of the vehicle speed. With adoption of the automatic starting control method, the automatic starting control of the engine of the hybrid electric vehicle is finished, and the starting process is steady and fast.

Description

technical field [0001] The invention belongs to the technical field of electric and hybrid vehicles, in particular to a method for automatically starting a hybrid vehicle engine. Background technique [0002] Hybrid vehicles are driven by engines and / or motors, and are distinguished by different numerical codes according to the different positions of the drive motors in the hybrid power transmission system, which are respectively P0, P1, P2, P3, and P4 configuration hybrid power systems , the motors of each configuration are P0 motor, P1 motor, P2 motor, P3 motor and P4 motor. The P2 motor is placed before the gearbox input shaft, after the clutch connected to the engine, and the P3 motor is placed after the gearbox output shaft. The mode in which the P2 motor and the engine jointly drive the vehicle is the P2 hybrid mode, and the mode in which the P3 motor and the engine jointly drive the vehicle is the P3 hybrid mode. [0003] The current driving logic of hybrid vehicles...

AI Technical Summary

Problems solved by technology

The existing engine automatically starts for a long time and is not smooth. There is an obvious power interruption during driving, which affects the overall acceleration performance, and the power delay time is relatively long.

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