The invention provides an engine starting method for a hybrid power system. An engine of the hybrid power system is in controlled transmission connection with an input shaft of a transmission through a clutch, and a motor is in transmission connection with the input shaft of the transmission all the time. The engine starting method is used for starting an engine when a motor is in a driving state. Specifically, the torque capacity of the clutch is increased, the speed of the engine is gradually increased, and at the time point when the speed of the engine is increased to the minimum engine ignition speed, the engine conducts oil injection ignition so as to start the engine. Therefore, the torque capacity of the clutch is not reduced before the engine is ignited, so that the problem that the engine fails to start due to the fact that the speed of the engine is reduced too fast due to reduction of the torque capacity of the clutch is avoided. Moreover, the engine is ignited when the engine speed reaches the minimum engine ignition speed, so that the starting duration of the engine is shortened.
本发明提供了一种用于混合动力系统的发动机启动方法。该混合动力系统的发动机经由离合器与变速器的输入轴受控地传动联接,电机与变速器的输入轴始终传动联接。根据本发明的发动机启动方法用于在电机处于驱动状态时启动发动机。具体地,增大离合器的扭矩容量,使发动机的速度逐渐增大,在发动机的速度增大到最小发动机点火速度的时间点,发动机进行喷油点火,以启动发动机。这样,由于在发动机进行点火之前,离合器的扭矩容量不降低,因而避免了离合器的扭矩容量降低使发动机速度降低过快而导致发动机启动失败的问题。而且,由于发动机速度达到最小发动机点火速度发动机就进行点火,因而缩短了发动机启动持续时间。
Engine starting method for hybrid power system
用于混合动力系统的发动机启动方法
2021-05-07
Patent
Electronic Resource
Chinese
IPC: | B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion |
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