Engine start control method

Abstract

The invention provides an engine starting control method which comprises the following steps that an engine controller controls a fuel pump to build an oil pressure, a vehicle body electronic stabilization system controls the deceleration of a whole vehicle to be unchanged, an AT gearbox controller controls a lock-up clutch to be opened, and a K0 clutch enters a torque control state. A P2 motor controller and an AT gearbox controller control a P2 motor to be synchronous with the rotating speed of an engine, the AT gearbox controller controls the K0 clutch to be closed, and an engine controller controls the engine to ignite and activates an engine torque framework; and a vehicle control unit increases the engine torque demand according to the driver torque demand and reduces the P2 motor torque demand according to the actual engine torque, and the AT gearbox controller controls the lock-up clutch to be closed. According to the engine starting control method, control over starting of the engine in the energy recovery process is achieved through effective information interaction among the controllers, so that the driving safety can be improved, and the risk of power shortage of a high-voltage battery can be reduced.

Description

technical field [0001] The invention relates to the technical field of engine control, in particular to an engine startup control method. Background technique [0002] With the progress and development of society, people pay more and more attention to environmental protection and energy crisis. Because hybrid electric vehicles have important advantages in energy saving and environmental protection, they have become an important direction for the development of the automobile industry. [0003] With the rapid development of hybrid electric vehicles, a relatively new power configuration vehicle is a P2 architecture hybrid electric vehicle, which mainly includes structures such as an engine, a P2 motor, a hydraulic torque converter, and an AT gearbox. Generally, P2 architecture hybrid vehicles will perform energy recovery during coasting and braking, and starting the engine during energy recovery is one of the key technologies of hybrid vehicles. [0004] In the prior art, the...

AI Technical Summary

Problems solved by technology

[0005] (1) If the vehicle slides downhill, the engine will not start, and the anti-drag force of the engine cannot be used to brake the vehicle, which will affect driving safety

[0006] (2) If the power of the high-voltage battery is low to a certain limit, the engine will not start, and it will not be able to drive the motor to generate electricity to charge the high-voltage battery, which will easily cause the risk of power loss of the high-voltage battery

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