Implementing method for front vehicle following

Abstract

The invention discloses an implementing method for front vehicle following. The implementing method comprises the following steps of expressing following characteristics of vehicle distance control on a phase plane plot, wherein the transverse axis is the relative distance R of the two vehicles, and the vertical axis is the relative speed V of the two vehicles; adopting a straight line and curve combining method to determine an ideal target following characteristic curve in the phase plane plot; setting an ideal working point and a relatively ideal working point on the phase plane plot; adjusting the relative distance of the two vehicles in the front vehicle following way to approximate to the amplitude Ra; in the initial phase when the Ra is not reached, adopting the fixed acceleration and deceleration to approximate to the vehicle distance of the ideal working point; in the adjusting phase after the Ra is reached, reducing an accelerator or braking to reach the ideal working point, wherein the ideal working point is that the relative speed of the two vehicles is zero and the relative distance of the two vehicles is the ideal and safe vehicle distance set by a driver. The implementing method for the front vehicle following is applied into a vehicle cruising control system, so the comfortability and safety of the vehicle cruising control system are improved, and the easiness in accepting by the driver is realized.

Description

technical field [0001] The invention relates to a vehicle ideal following characteristic design method capable of reflecting the following behavior of a preceding vehicle under real traffic conditions of a driver, belongs to the field of automobile active safety, and can be better integrated into the development of a vehicle adaptive cruise control system. Background technique [0002] Automotive adaptive cruise control system (Adaptive Cruise Control, referred to as ACC system) is developed on the basis of traditional cruise control (Cruise Control System, referred to as CC system). , and at the same time perceive the traffic environment in front of the vehicle through radar and other on-board sensors, and can automatically apply the accelerator or brake to realize the longitudinal control of the vehicle, so that the vehicle and the vehicle in front maintain an appropriate safe distance. The adaptive cruise system can reduce the driver's operating burden and improve the dri...

AI Technical Summary

Problems solved by technology

[0004] Although the existing vehicle-to-vehicle distance maintenance can ensure the safety between vehicles, for the driver, the control quality of the control process cannot meet the driver's acceptability.

Compared with the daily operation behavior of ordinary drivers, the control based on the ideal safe distance calculated purely through the vehicle motion state is often simple and rough, and the process of actuator control is not smooth, which also affects the comfort of the ride. certain influence

At the same time, changes in the motion state of the vehicle in front often cause large fluctuations in the control of the vehicle, which reduces the comfort and safety of the cruise control system.

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