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Vehicle longitudinal motion control method and vehicle longitudinal motion control system

A technology of longitudinal motion and control method, applied in the field of vehicle longitudinal dynamics control, to achieve the effect of shortening the development cycle and improving the function

Active Publication Date: 2020-11-17
SAIC GENERAL MOTORS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the acceleration planned by the known upper-level control system is only applicable to the normal, non-emergency driving conditions of the vehicle. In the case of emergency braking, the automatic braking system (AEB) of the vehicle often needs to be triggered to avoid collisions

Method used

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  • Vehicle longitudinal motion control method and vehicle longitudinal motion control system
  • Vehicle longitudinal motion control method and vehicle longitudinal motion control system
  • Vehicle longitudinal motion control method and vehicle longitudinal motion control system

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Embodiment Construction

[0038] For purposes of brevity and illustration, the principles of the invention are described herein primarily with reference to exemplary embodiments thereof. However, those skilled in the art will readily recognize that the same principles are equally applicable to all types of vehicle longitudinal motion control methods and vehicle longitudinal motion control systems based thereon, and that these same or similar principles can be implemented therein , any such changes do not depart from the true spirit and scope of this patent application. Moreover, in the following description, reference is made to the accompanying drawings, which illustrate certain exemplary embodiments. Changes may be made to these embodiments without departing from the spirit and scope of the invention. Furthermore, although a feature of the invention is disclosed in connection with only one of several implementations / embodiments, such feature may be combined with other implementations as may be desir...

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Abstract

The invention relates to a vehicle longitudinal motion control method which comprises the following steps of: setting a control quantity as an expected acceleration ades which comprises a proportionallink of a difference value delta d between an expected safe distance between a controlled vehicle and a front vehicle and an actual vehicle distance and a proportional link of a difference value delta v between an expected vehicle speed of the controlled vehicle and an actual vehicle speed; wherein the coefficient of the proportional element of delta d and the coefficient of the proportional element of delta v are respectively expressed as k1 and k2; solving pre-collision time TTC according to the actual vehicle distance and the relative speed Vrel between the controlled vehicle and the frontvehicle; defining a control target of the system as a target function which is the minimum value of an infinite domain integral term, and the integral term comprises a quadratic proportion link of delta d or a quadratic proportion link of delta v and a quadratic proportion link of ads, wherein the coefficients of the quadratic proportion link of delta d, the quadratic proportion link of delta v and the quadratic proportion link of ads are respectively expressed as Q1, Q2 and R; using a fuzzy control method for solving Q2 and R according to Vrel and TTC; and obtaining k1 and k2 by using the Q2and R values.

Description

technical field [0001] The invention relates to vehicle longitudinal dynamics control, in particular to a vehicle longitudinal motion control system. Background technique [0002] The general vehicle longitudinal control system mostly consists of two layers of control systems, upper layer control and lower layer control. The upper-level control system is used to plan the acceleration of the vehicle, while the lower-level control system is used to control the trajectory of the vehicle to ensure that the vehicle travels according to the predetermined acceleration. However, the acceleration planned by the known upper-level control system is only applicable to the normal and non-emergency driving conditions of the vehicle. In the case of emergency braking, the automatic braking system (AEB) of the vehicle often needs to be triggered to avoid collisions . At the same time, in order to take into account the driving comfort of the vehicle and the smooth, fast and accurate control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W30/095B60W30/09
CPCB60W30/09B60W30/0953B60W2520/10B60W2720/106
Inventor 张凯马骁朱晓华
Owner SAIC GENERAL MOTORS
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