Car-following speed control method

A technology for vehicle following and car-following, which is applied in the field of vehicle operation control and vehicle-following speed control. It can solve problems such as environmental conditions and requirements that are generally not considered and cannot meet new needs.

Active Publication Date: 2018-10-12
CHANGZHOU VOCATIONAL INST OF ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing speed control methods consider the surrounding environmental conditions mainly to consider the driving state of the front and rear vehicles, and generally do not consider the conditions and requirements of the driving environment. However, the current vehicles must follow different safety distances between the front and rear vehicles when driving on different roads. The requirements of traffic laws and regulations, which put forward new requirements for the vehicle-following speed control method used in the current development of unmanned driving technology and traffic flow simulation modeling, the original method can no longer meet the new needs

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Embodiment Construction

[0051] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0052] The present invention uses the distance D between vehicles as the basis for safety judgment of car-following speed control, considers the difference in car-following status of vehicles under different car distances, uses the following conditions to select and describe the rules, and establishes car-following speed control rules based on the safety distance. The process flow of the vehicle following speed control method of the present invention is as follows: figure 2 shown.

[0053] ①D≥D free &D free >D safe Time

[0054] around v max Speed-following;

[0055] a=a free , v n+1 (t+T)=v n+1 (t)+a;

[0056] ②D≥D free &D free ≤D safe Time

[0057] around D safe Speed-following;

[0058] a=a safe , v n+1 (t+T)=v n+1 (t)+a;

[0059] ③D free >D≥D delt_min &v n+1 ≥50

[0060] around D safe Speed-following;

[0061] a=a safe , v n+1 (...

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Abstract

The invention discloses a car-following speed control method. The method comprises that spacing between a front vehicle and a rear vehicle serves as a safety judgment basis for the car-following speedcontrol, difference of a car-following state under different vehicle spacing is considered, condition selection is adopted to perform description, speed of the next moment is determined, so that critical safety headstock spacing under different traffic flow conditions is obtained, and position update is achieved. The car-following speed control method considers the requirements of safety distancecontrol of the front and rear vehicles in the traffic regulations, follows change rules of macroscopic traffic flow states, respectively proposes calculation methods of the critical safety headstockspacing under different traffic flow states, then proposes a method for obtaining car-following acceleration and deceleration under different traffic flow states, provides a basic implementation method of vehicle speed control rules for a driverless technology or traffic flow simulation modeling and other core modules, and provides a core basic implementation method for the development of relatedtechnologies more comprehensively and scientifically.

Description

technical field [0001] The invention belongs to the technical field of land vehicle operation control, and relates to a vehicle operation control method, in particular to a vehicle-following operation speed control method. Background technique [0002] The car-following speed control method is an important part of micro-traffic flow analysis. With the further development of unmanned driving technology and traffic flow simulation technology, higher requirements are put forward for the accuracy and reliability of the car-following speed control method. [0003] The essence of the car-following speed control method is to calculate and determine the acceleration and deceleration of the current vehicle and the vehicle speed according to the current driving state of the vehicle and the driving conditions of the current vehicle and the surrounding environment. The basic principle is as follows: figure 1 shown. The car-following speed control method can be summarized as a functiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D1/02
CPCG05D1/0214G05D1/0223G05D2201/0212
Inventor 徐永廖少明
Owner CHANGZHOU VOCATIONAL INST OF ENG
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