Method and system for controlling torque of four-wheel-drive vehicle

Abstract

The invention provides a method and a system for controlling torque of a four-wheel-drive vehicle. The method comprises: preliminarily distributing torque, receiving a driver operation behavior to determine total demanded torque, distributing the total demanded torque to first shaft demanded torque and second shaft demanded torque; performing active intervention processing on the torque, receiving current state signals of a vehicle, adjusting the first shaft demanded torque and the second shaft demanded torque, and determining upper limit values of the adjusted first shaft demanded torque and the adjusted second shaft demanded torque; and a vehicle electronic stability system performing intervention processing, when a torque variation signal of a first shaft, output by the vehicle electronic stability system, is received, performing transferring and arbitration processing on the torque, to obtain a first shaft final demanded torque and a second shaft final demanded torque. The method and the system for controlling torque satisfy dynamic property requirement of the driver to the greatest extent on the basis of ensuring optimal vehicle fuel economy, vehicle security, and handling stability.

Description

technical field [0001] The invention relates to the field of electric vehicle control, in particular to a torque control method and system for a four-wheel drive vehicle. Background technique [0002] Electric vehicles refer to vehicles that use vehicle-mounted power supplies as power, drive vehicles with motors, and meet the requirements of various road traffic safety regulations. Because electric vehicles have less impact on the environment than traditional vehicles, they are widely considered to be one of the main ways to solve problems such as vehicle exhaust pollution and oil energy shortages. [0003] Traditional electric vehicles generally use a single power source to provide power. The volume and power of the motor are relatively large, and a complex mechanical transmission mechanism is required, such as a transfer case, which transmits the power of the motor to the front and rear axles of the vehicle to achieve Four-wheel drive function; a new generation of electri...

AI Technical Summary

Problems solved by technology

In actual driving, there is such a situation that when the road conditions passed by the front axle wheels change, such as when passing through ice and snow, the front axle wheels need to reduce the torque. The control strategy in the prior art generally directly reduces the torque of the front axle wheels. , although this ensures the safety of the vehicle, it affects the dynamic performance of the vehicle to a certain extent

In the prior art, there is no ideal method for controlling the torque of a four-wheel drive vehicle, so that it can meet the driver's power requirements as much as possible on the basis of ensuring the safety and handling stability of the vehicle.

Images