Control method for motor fault treatment of dual-motor power divided-flow type hybrid electric vehicle

Abstract

The invention provides a control method for motor fault treatment of a dual-motor power divided-flow type hybrid electric vehicle. The control method for motor fault treatment of the dual-motor powerdivided-flow type hybrid electric vehicle comprises the steps that firstly, the output torque gradient of a fault motor is controlled to reduce to 0, the rotating speed of the fault motor is controlled by adjusting the rotating speed of an engine, and until an absolute value of the rotating speed of the fault motor is less than a presser value A; then a brake connected with the fault motor is locked, so that the rotating speed of the fault motor is enabled to be 0, and a whole vehicle controller controls and adjusts another normal motor and the engine to realize while vehicle torque output; and when the rotating speed of the engine is less than or equal to a critical threshold value B of the rotating speed of the engine, the engine is controlled to stop oil injection and ignition, the another normal motor is controlled to realize the whole torque output and reversed towing speed adjustment of the engine, if power battery capacity is less than or equal to an SOC lower limiting value C,the whole output torque is eliminated, and the vehicle stops gradually. The control method for motor fault treatment of the dual-motor power divided-flow type hybrid electric vehicle is simple and feasible, and can improve safety of vehicle driving.

Description

technical field [0001] The invention relates to the control field of a hybrid electric vehicle, in particular to a motor fault processing and control method of a dual-motor power split type hybrid electric vehicle. Background technique [0002] When a hybrid electric vehicle is running, especially at a high speed, if a motor fault occurs as a major fault, the vehicle will generally take corresponding fault handling and control measures at this time. For a hybrid electric vehicle using a dual-motor power-split hybrid transmission, when the motor connected to the brake fails during high-speed driving, the method of directly clearing the output torque of the entire vehicle is generally adopted, and the high voltage is applied when the vehicle is close to stationary. However, in this way, the whole vehicle will have no torque output during the motor failure to the vehicle parking process, which will affect the driving safety of the vehicle. Contents of the invention [0003] ...

AI Technical Summary

Problems solved by technology

For a hybrid electric vehicle using a dual-motor power-split hybrid transmission, when the motor connected to the brake fails during high-speed driving, the method of directly clearing the output torque of the entire vehicle is generally adopted, and the high voltage is applied when the vehicle is close to a standstill. However, in this way, the whole vehicle will have no torque output during the process from motor failure to vehicle parking, which will affect the driving safety of the vehicle.

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