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Hybrid electric vehicle engine starting control method

The invention relates to a hybrid electric vehicle engine starting control method. When an engine receives a starting instruction during forwarding, if the rotation speed of the engine is larger thanthe minimum starting rotation speed of the engine, the engine sprays fuel for ignition and enters a rotation speed control mode, wherein the target rotation speed is the rotation speed of a motor, a coupling mechanism clutch remains a separated state, and the target torque of the motor is the demand torque of a driver. When the rotation speed difference between the motor and the engine is lower than a first preset value, the engine continues to maintain the rotation speed control mode, and the coupling mechanism clutch is in a semi-engaged state. When the rotation speed difference between themotor and the engine is lower than a second preset value, the coupling mechanism clutch is gradually fully-engaged to be in a locked state according to a certain rate; meanwhile, the engine is switched from the rotation speed control mode to the torque control mode, and the target torque of the engine is gradually changed to the demand torque of the driver. After the torque of the coupling mechanism clutch is greater than a preset lock value, the starting process is finished. Towing of the motor is not needed, the engine is started, and the starting time of the engine is shortened while the smoothness is ensured.
Owner:CHONGQING CHANGAN AUTOMOBILE CO LTD
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