Motor torque smoothing treatment method for hybrid power and a hybrid power system

A hybrid power system comprising an engine (1), a motor (3) and a gear box (4) mechanically connected through a shaft (2), the motor (3) is an integrated starter/generator, and a Hybrid Control Unit HCU (9), an Engine Management System EMS (8), a Motor Control Unit MCU (10) and a Battery Management System BMS (11) communicates through a Controller Area Network CAN bus (12), wherein:

• the HCU (9) is adapted to:
• determine a current operation mode and a demanded operation mode of the motor and further conversion between the operation modes of the motor, and determine from the conversion a time parameter for smoothing a torque of the motor and a target torque;
• to determine whether the demanded operation mode is stable or not and lock the stable demanded operation mode when the demanded operation mode is stable and the conversion is not conversion into an idle mode;
• and to calculate an incremental step of a current actual output torque from the time parameter and the difference between the target torque and the current actual output torque and further calculate an actual output torque from the incremental step and the current actual output torque, and transmit the calculated actual output torque to the MCU (10).