Hybrid vehicle power system and motor discharge capacity estimation method and controller

Abstract

The application discloses a motor discharge capacity estimation method for a hybrid vehicle system; at least one motor is provided with respective discharge priorities according to numbers small to large, discharge capacities of the motors are estimated according to the discharge priorities, wherein the method of estimating the discharge capacity of one motor includes: acquiring available discharge power of the motor according to residual discharge power of a power battery, actual consumed power of an electricity-consuming part of a current low-voltage load, and current actual output powers of the motors prior to the current motor, and converting it into available discharge torque; using a minimum of the available discharge torque, external characteristic torque of the motor and maximal allowable discharge torque of the motor as discharge capacity of the motor. By distributing torques of the corresponding motors within the motor discharge capacities estimated by the method, power battery overdischarge can be avoided, and the discharge capacity of each motor can be given to full play. The application also discloses an estimation controller and hybrid vehicle power system based on the method.

Description

technical field [0001] The invention relates to the technical field of hybrid electric vehicles, in particular to a method for estimating the discharge capacity of a power system of a hybrid electric vehicle. It also relates to a motor discharge capacity estimation controller and a hybrid vehicle power system based on the discharge capacity estimation method. Background technique [0002] Hybrid vehicles (also known as hybrid vehicles) combine the advantages of traditional internal combustion locomotives and pure electric vehicles, which can not only achieve the effect of energy saving and emission reduction, but also meet the cruising range, and have been increasingly favored by consumers and major OEMs Pursued, the market benefits have been increasingly apparent. The power system of a hybrid electric vehicle mainly includes an engine, a motor, a power battery, a gearbox, and an inverter. [0003] In order to meet different functional or performance requirements, the conf...

AI Technical Summary

Problems solved by technology

Otherwise, the vehicle's power system capacity will not be fully utilized or the power battery will be overcharged or overdischarged, which will affect the vehicle's power performance or the life of the power battery.

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