A startup control method and system

Abstract

The embodiment of the invention provides a starting control method and system, and relates to the technical field of engine control. The starting control method comprises the following steps that whenthe current remaining electric quantity is smaller than a low electric quantity threshold value, a starter is controlled to drag an engine to accelerate to the first rotating speed; when the currentrotating speed of the engine reaches the first rotating speed, an engine ignition signal is sent to the engine, and thus the engine enters into the automatic operation stage; based on the preset engine expected rotating speed, the engine is controlled to accelerate to the second rotating speed; and when the engine reaches the second rotating speed, coupling control of the engine power and the P2 motor power is completed by combining with a separation clutch. By applying the scheme, when the engine in the shutdown state is started, the starter enables the engine to accelerate to the first rotating speed firstly, then the engine automatically operates and approaches to the engine expected rotating speed, and thus even if the remaining electric quantity of a vehicle is insufficient, the engine and a motor can still jointly provide torque to meet the vehicle acceleration torque requirements.

Description

technical field [0001] The present invention relates to the technical field of engine control, in particular to a starting control method and system. Background technique [0002] At present, the hybrid system based on the hybrid technology has less changes to the traditional transmission system, and has the advantages of obvious fuel saving effect, so it is more popular. Such as figure 1 As shown, the P2 hybrid system in the hybrid system is taken as an example for introduction. The P2 module is the core technology of the P2 hybrid system, and the P2 module includes a motor and a separation clutch. For the consideration of maximizing fuel-saving capability, when the vehicle speed exceeds the set value, the engine is controlled to enter the shutdown state. Therefore, in the actual driving process of the vehicle, when the engine is turned off and the driver needs to change the driving intention (such as wanting the vehicle to enter the acceleration state), it is usually nec...

AI Technical Summary

Problems solved by technology

However, for hybrid vehicles, when the remaining power of the vehicle is not enough to support the motor to drive the engine, the motor drive in the P2 module alone cannot meet the torque demand for vehicle acceleration.

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