Research On Climb Lane Assisted Design System Based On Vehicle Dynamics

The speed reduction caused by the lack of climbing ability of trucks has a great impact on road capacity and traffic safety.Setting climbing lanes is an effective means to solve the above problems.However,there are still some deficiencies in the setting of climbing lanes in China.The definition of the standards is not specific,and some of the conditions are not quantified.Therefore,based on the driver’s behavioral factors,the vehicle speed prediction model based on vehicle dynamics is studied,and the climbing lane assisted design system is developed to accurately calculate the freeway speed,which helps to improve the existing setting basis and provide technical support for personality and scientifically setting climbing lane design.Firstly,this paper analyzes the existing basis and existing problems of the climbing lanes in detail,and proposes the necessity of establishing a prediction model of the truck’s driving speed.Then take the two-axle single-vehicle truck and the six-axis semi-trailer truck as examples.A dynamic model of the truck is proposed for the curved section combined slope section.Through the analysis of the load-carrying vehicles,the stable speed and the maximum safety speed in the process of cornering under a single vertical slope are proposed.Based on the consideration of the speed control of the driver,a prediction model of the truck’s driving speed is established,and a real vehicle experiment was used to calibrate the model.Then,tests were performed in the Qinling section of the XiHan Freeway,and the vehicle operating attitude parameters were collected by a CAN bus collector.The road alignments were acquired by the video and the vehicle operating parameters during the running of the truck were obtained.Through the data preprocessing,the operation status of the trucks in the free-flow condition is obtained.After the data processing,the driver’s speed control model of the longitudinal section and curved slope section of the truck is obtained,and the prediction model of the truck’s driving speed is finally calibrated.Finally,a climbing lane assisted design system based on vehicle dynamics was developed.Through the simulation system,the difference between the prediction model and measured value of the driving speed of a certain section of the XiHan Freeway was compared and the results showed that the truck speed prediction established in this paper was predicted.The relative error between the predicted value and the measured value is controlled within 10%;then based on the simulation data and the traffic volume data of the Qinling section of the XiHan Freeway,the position of the climbing lane and the length of the climbing lane are obtained for the continuous longitudinal section.The single-vehicle travel speed simulation calculation was performed for a specific truck,and the climbing performance curve of a single vehicle was obtained.The longitudinal slope length limit corresponding to different design speed under certain speed reduction was calculated.