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

Active Publication Date: 2021-09-14
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 method for controlling the longitudinal motion of a vehicle, which includes setting the control amount as the desired acceleration a des , which includes the proportional link of the difference Δd between the expected safety distance and the actual vehicle distance between the controlled vehicle and the front vehicle and the proportional link of the difference Δv between the expected vehicle speed and the actual vehicle speed of the controlled vehicle, the coefficients of the proportional link of Δd and The coefficients of the proportional link of Δv are expressed as k1 and k2 respectively; according to the actual distance between the controlled vehicle and the front vehicle and the relative speed V rel Find the pre-collision time TTC; define the control target of the system as the following objective function, which is the minimum value of the following infinite field integral term, and the integral term includes the ratio link of the quadratic power of Δd or the ratio of the quadratic power of Δv links and a des The proportional link of the quadratic power of Δd, the proportional link of the quadratic power of Δd, the proportional link of the quadratic power of Δv and a des The coefficients of the proportional link of the quadratic power are respectively expressed as Q1, Q2 and R; using the fuzzy control method according to V rel and TTC to obtain Q2 and R; use the value of Q2 and R to obtain k1 and k2.

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 Patents(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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