Realization method of multi-step torque control for electric vehicle creeping

Abstract

The invention discloses a method for realizing multi-step torque control of electric vehicle creep driving, which mainly monitors gear signal, accelerator pedal signal, brake pedal signal, vehicle speed, motor speed and actual output torque of the motor through a vehicle controller. According to the above-mentioned monitored signals, it is determined that the vehicle is in a creeping condition, and the collected signals are used to determine whether the vehicle speed does not meet the creeping target speed, and the torque is smoothly output through the set multi-step torque. When the vehicle speed is lower than or higher than the creeping target vehicle speed, the vehicle controller will automatically run to the set torque of the higher or lower step within the set torque control step, so as to realize the smooth increase and decrease of the torque. The stability of the vehicle's target speed enables the vehicle to move forward and creep on its own under slope conditions. The method of the invention can reasonably utilize the driving and electric braking characteristics of the motor, thereby reducing the operation of the driver.

Description

technical field [0001] The invention relates to a control method of a new energy electric vehicle, in particular to a method for realizing multi-step torque control of electric vehicle creeping. Background technique [0002] With the rapid development of China's economy, people's living standards are getting higher and higher, and the purchasing power of automobiles has also been greatly improved, making my country's energy and environmental problems increasingly serious. Starting from the national conditions, we need to increase the research and development of electric vehicles. Since the electric passenger car works through the output torque of the motor, the driving requirements of the vehicle are met, and the vehicle generally has the function of creeping. [0003] At present, the creep driving function of passenger cars adopts the vehicle speed as the target single torque control output form. When the vehicle creeps to a small slope or speed bump, the vehicle will not ...

AI Technical Summary

Problems solved by technology

[0003] At the present stage, the creeping function of passenger cars adopts the vehicle speed as the target single torque control output form. When the vehicle creeps to a small slope or speed bump, the vehicle will not be able to continue because the maximum value of the single torque control has been set. purpose of moving forward

Or due to driving on a downhill road condition, without using the characteristics of electric braking of the motor, even if there is no torque output, the vehicle's inertia will also cause the vehicle speed to be higher than the set creep target vehicle speed under the creeping condition

The driver needs to step on the accelerator pedal to pass through, or reduce the creeping speed by stepping on the brake pedal, which increases the driver's excessive operation

Images