Motor electricity generation control method and system for hybrid power vehicle

Abstract

The invention provides a motor electricity generation control method for a hybrid power vehicle. The motor electricity generation control method comprises the following steps that the current rotatingspeed and the target rotating speed of a motor, and the allowable charge and discharge power of a battery pack are obtained; the intervals (Tmin and Tmax) of available torque of the motor are determined according to the current rotating speed and the allowable charge and discharge power, and the torque requirement Treq is determined according to the current rotating speed and the target rotatingspeed; when the torque requirement Treq is negative and |Treq| is larger than |Tmin|, the theoretical torque loss value Tloss of the motor is calculated according to the torque requirement Treq and Tmin; the actual torque loss value Tloss' of the motor is obtained according to the theoretical torque loss value Tloss; and the motor is controlled to conduct torque loss according to the actual torqueloss value Tloss' in order to enable the motor to output the torque requirement Treq, and thus the electricity generation efficiency of the motor is reduced to an efficiency threshold value. According to the motor electricity generation control method, by reducing the charging power of the high-voltage end, under the condition that the battery allowable charging power is limited, it is guaranteedthat the motor outputs sufficient negative torque to complete speed adjusting within the specified time, and thus smooth gear shifting is achieved.

Description

technical field [0001] The invention relates to the technical field of electric motor power generation of hybrid electric vehicles, in particular to a method and system for controlling electric motor electric power generation of hybrid electric vehicles. Background technique [0002] The control method of the vehicle's gear shifting process has an important impact on the comfort during gear shifting. A reasonable gear shifting method not only makes passengers feel comfortable, but also prevents damage caused by excessive clutch slipping time. In order to ensure the vehicle performance of the hybrid electric vehicle, the motor needs to complete the speed regulation in a short time when shifting gears. When the actual speed of the motor and the target speed differ greatly, the torque demand of the motor when shifting speed regulation is relatively large , at this time, if the motor speed is high, the instantaneous power of the motor is large. When the charging power allowed b...

AI Technical Summary

Problems solved by technology

In this way, the motor works in a fixed gear, and the working efficiency is low when the motor speed is high or low, and the vehicle speed is also affected, thus affecting the energy saving and power performance of the whole vehicle.

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