Carsim simulation based calculation method for speed limit value of highway circular curve sections

Abstract

The invention discloses a Carsim simulation based calculation method for a speed limit value of a highway circular curve section. The method comprises the following steps: respectively establishing ayaw rate safe boundary calculation model and a front wheel side slip angle absolute value mean safe boundary calculation model, and obtaining a yaw rate safe boundary and a front wheel side slip angleabsolute value mean safe boundary by calculation based on the models; establishing a driver control-car-3D highway coupling simulation model in car dynamics simulation software Carsim, gradually increasing simulation speed in the simulation model with designed car speed as initial simulation speed, obtaining yaw rate and front wheel side slip angle absolute value mean which are fed back by the car during running on the highway; when any value of the fed-back yaw rate and front wheel side slip angle absolute value mean reaches the safe boundary, determining the simulation speed at the time asthe speed limit value corresponding to the highway circular curve section. The method can accurately reflect the influence of highway 3D alignment and surface attachment conditions on lateral movementof the car, and driving safety under different weather conditions and geometric parameters of circular curve sections can be improved.

Description

technical field [0001] The invention relates to a calculation method of highway speed limit value, specifically a calculation method of speed limit value of circular curve section of highway based on Carsim simulation, which can be used to set the speed limit value of automobiles driving on circular curve section, so as to achieve The purpose of driving safety on the circular curve section of the highway. The invention belongs to the field of highway traffic management and highway traffic safety. Background technique [0002] Circular curve road sections are road accident-prone road sections. When a car is driving on a circular curve road section, it is easy to cause road traffic accidents due to lateral instability, and speeding further increases the risk of accidents. [0003] Vehicle speed management and control is an important means to ensure road safety. Speed ​​limit strategies such as operating speed, speed limit based on expert decision support system (such as USLi...

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Problems solved by technology

However, this calculation method has the following problems: first, the lateral force coefficient can only reflect the track keeping ability of the car, and cannot characterize the steering stability; It is not accurate to use sideslip as the critical instability condition; thirdly, in order to provide a larger safety margin, a lower road surface friction coefficient is selected. Therefore, the speed limit value is a fixed value, and for the adhesion coefficient Higher road surface is more conservative

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