Self-adaptive cruising longitudinal adjustment control method and system of vehicle

Abstract

The invention provides a self-adaptive cruising longitudinal adjustment control method and system of a vehicle. The method includes the steps of periodically obtaining the target acceleration and actual acceleration of the vehicle according to a preset period, calculating the acceleration difference value between the target acceleration and the actual acceleration, calculating the original outputtorque of a proportional integer (PI) controller according to the acceleration difference value, conducting gradient limiting treatment and filtering treatment on the original output torque to obtainthe expected output torque, and determining the target torque for being inputted to a motor controller and the target hydraulic pressure intensity for being input to a brake controller according to the expected output torque and the maximum recovery torque of the vehicle. According to the method, by introducing the variable-parameter control and the gradient limiting treatment and filtering treatment, the riding comfort of the vehicle is ensured; motor recovery is conducted as much as possible when the capacity of a motor system is sufficient, compensation is conducted through hydraulic brakewhen the capacity of a motor is insufficient, and economy is ensured.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a vehicle adaptive cruise longitudinal adjustment control method and system. Background technique [0002] The adaptive cruise control system is a new type of vehicle safety assisted driving technology developed on the basis of the traditional cruise control system. Its main functions include: first, approaching the vehicle ahead at a set speed; The slower vehicle rear brakes and drives behind it; the third, accelerates and drives at the set speed after the vehicle in front has left its lane. In order to achieve the above functions, it is necessary to use cameras, radars, sensors, etc. to sense the vehicle's environment. The relative speed and distance between the vehicle and the vehicle in front are used as inputs, and the target longitudinal acceleration is obtained through information fusion processing and control algorithms. Finally, through Vehicle longitudinal adjustme...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, when the vehicle follows the vehicle in front during driving, although comfort and economy are considered, in the longitudinal control of the target acceleration, the influence of comfort on the longitudinal control is not realized. When, economical is always the control goal, but there are no control measures that can be implemented

Images