Engine starting method and device for single-axle parallel hybrid vehicle

Abstract

The invention provides an engine starting method and device for a single-axle parallel hybrid vehicle. When single-axle parallel hybrid vehicle satisfies an engine starting condition and has a gear-shifting demand in the pure electric running process, a gearbox is controlled to shift gears; when the gearbox finishes gear disengagement and is in an idling gear position, a motor is adopted to drag the engine to a target rotation speed so that the use frequency of a motor is reduced and the service life of the motor is further prolonged; and the engine speed regulation process and the gear-shifting speed regulation process are merged into one process so that the engine can start to output power after the speed regulation is finished and the gear is engaged; as the whole engine starting process is combined with the gear shifting process, the time of the engine from being started to being involved in the power output process is greatly reduced, the power performance of the whole vehicle is improved, and vehicle jitter and clutch wear, which are caused because a clutch is directly combined to drag the engine to be started without the idling gear running, are avoided.

Description

technical field [0001] The present invention relates to the technical field of single-shaft parallel hybrid vehicles, and more specifically, to an engine starting method and device for single-shaft parallel hybrid vehicles. Background technique [0002] In the method of starting the engine of a traditional car, when the vehicle is parked, the driver uses a key to trigger the starter motor attached to the engine to drive the engine to start. A single-shaft parallel hybrid electric vehicle adds an engine starting method, that is, in the parking state, keep the gear in neutral, engage the clutch, and then use the motor output torque to drag the engine to start. But above-mentioned two kinds of engine starting methods all have respective restrictive conditions: motor starting engine mode must keep gear position and be neutral gear or clutch keep disengagement state; [0003] During the driving process of a single-shaft parallel hybrid electric vehicle, there is an engine idle s...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention proposes a method and device for starting the engine of a single-shaft parallel hybrid electric vehicle, which aims to solve the problem of frequent use of the motor and the reduction of the life of the motor, as well as vehicle vibration and clutch wear caused by directly engaging the clutch and dragging the engine to start while driving. technical issues

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