A motor torque following method when an electric vehicle exits a parking slope

Abstract

The present invention aims to provide a motor torque following method when the electric vehicle exits a parking slope, so that the response of the electric vehicle is faster and the start is more stable. The method of the present invention includes the following steps: (1) detecting the actual parking torque when the vehicle is currently parking on a slope; (2) detecting the percentage of the accelerator opening when the driver steps on the accelerator; (3) according to the actual parking torque when the vehicle is currently parking on a slope The sum of the torque value obtained by slope torque and throttle opening percentage is used as the current requested motor drive torque value; (4) The motor outputs torque according to the current requested motor drive torque value; (5) When the throttle opening percentage reaches 100% Or when it is 0%, exit the torque following mode, and the subsequent current motor drive torque request will be output according to the normal torque output. The invention can be applied in the field of automobile control.

Description

technical field [0001] The invention relates to the field of new energy vehicle control, in particular to a motor torque following method when an electric vehicle exits a parking slope. Background technique [0002] In the existing technology, parking on the slope has been one of the standard functions of new energy vehicles. When the existing electric vehicle is on the slope, when the driver steps on the accelerator to apply for exiting the parking torque, there are two ways to output the motor drive torque. The first method is: the motor needs to wait for the motor driving torque request to be greater than the actual parking torque before exiting the parking slope mode, execute the motor driving torque request of the vehicle controller, and thus enter the motor driving mode to drive the electric vehicle to run; the second method The method is: the moment the driver steps on the accelerator, the vehicle exits the parking slope mode, and the motor outputs the motor drive req...

AI Technical Summary

Problems solved by technology

However, the first method has the following disadvantages: different vehicle loads and different parking slopes require different actual parking torques, and the greater the actual parking torque, the longer the waiting time, which affects the driving experience; and When the actual on-slope torque is greater, the driver needs to step on the accelerator deeper. Then, when the driver steps on the accelerator, there will be a driving blank period for a period of time, which affects the response time of the vehicle and further affects the driving experience.

In the second method, when exiting the parking slope, the current motor torque request may be smaller than the actual parking torque, causing the vehicle to roll back when exiting the parking slope, affecting driving safety

Images