Multi-power-source coordinated control method used during gear shifting of hybrid electric vehicle

The invention relates to a multi-power-source coordinated control method used during gear shifting of a hybrid electric vehicle. According to the method, power of all power sources is coupled through a clutch and gearbox input shaft of a first power source end and a clutch and gearbox input shaft of a second power source end, then transmitted to a normally engaged gear in a corresponding gear position through a synchronizer, and finally transmitted to a wheel through a gearbox output shaft. The method comprises the steps that a TCU receives a finished automobile required gear position signal command, sends a torque reducing command aiming at each power source, judges whether the torque is reduced to be within the target torque range, sends a clutch starting command, a synchronizer moving command and a speed regulating command aiming at each power source end, and sends a torque increasing command aiming at the clutches and each power source and judges whether the torque is increased to be within a target torque range when it is judged that the synchronizer is in place and the speed of each power source end is well regulated, so that the gear shifting process is finished. By the adoption of the method, torque control in different control steps during gear shifting can be subdivided, torque increase and reduction of each power source are optimized, and unsmooth torque or pause and shock caused by fast change can be avoided.