A method and system for calculating the maximum available generating torque of a hybrid electric vehicle motor

Abstract

The invention relates to a maximum available power generation torque calculating method and a maximum available power generation torque calculating system of a hybrid electric vehicle motor. The system comprises a rotating speed obtaining unit, a current obtaining unit, a voltage obtaining unit, a torque calculating unit and a battery power obtaining unit. The system firstly obtains the total voltage and the total current of the high-voltage end of a high-low voltage converter, the maximum charging power of a motive power battery and the current motor rotating speed; then, the current power consumption power of a low-voltage electric appliance is calculated through the total voltage and the total current, the maximum charging power of the motive power battery is added to the current power consumption power of the low-voltage electric appliance, the allowable maximum power generation power of the motor is obtained, the allowable maximum power generation power of the motor is divided by the current motor rotating speed, and the first maximum power generation torque of the motor is obtained; the second maximum power generation torque of the motor is calculated according to the motor rotating speed and the motor power generation external characteristics; and finally, the smaller one in the first maximum power generation torque and the second maximum power generation torque of the motor is selected to be used as the allowable maximum power generation torque of the motor. The method and the system have the advantages that the vehicle can be enabled to make engines work in the optimal range during the whole vehicle engine driving, the energy loss and the contaminant discharging are reduced, and the economy of the whole vehicle is improved.

Description

technical field [0001] The invention relates to a control method for a power system of a hybrid electric vehicle, in particular to a method for calculating the maximum available generating torque of a motor of a hybrid electric vehicle. Background technique [0002] Hybrid vehicles usually have a motor, a high-voltage power battery, a low-voltage battery, and a high-voltage converter. The motor realizes electric and power generation functions, the high-voltage power battery stores energy, and the high-voltage converter realizes the transfer of high-voltage bus energy to low-voltage bus energy to provide Energy required by low-voltage electrical appliances and low-voltage batteries. When the motor is expected to generate electricity, the motor's generating torque cannot exceed the motor's maximum available generating torque. The maximum available generating torque of the motor is limited by many conditions such as the external characteristics of the motor, the remaining powe...

AI Technical Summary

Problems solved by technology

At present, there is no good method to accurately calculate the maximum available generating torque of the motor, and the maximum available generating torque of the motor directly affects the safety, durability and economy of hybrid electric vehicles

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