A method for improving the stability of long uphill traffic flow based on variable speed limit
A traffic flow and stability technology, applied in the field of intelligent transportation, can solve the problem of low traffic flow stability, and achieve the effects of slowing traffic shocks, reducing emissions and pollution, and avoiding sudden changes in speed.
Active Publication Date: 2021-12-28
ZHEJIANG LAB
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[0004] The purpose of the present invention is to provide a method for improving the stability of long uphill traffic flow based on variable speed limit in order to solve the problems of existing long uphill traffic flow management and control technology and the problem of low traffic flow stability
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[0050] The purpose and effects of the present invention will become clearer by describing the present invention in detail according to the accompanying drawings and preferred embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0051] The present invention is a method for improving the stability of long uphill traffic flow based on variable speed limit, which is mainly used for long uphill sections of urban expressways or expressways. Firstly, the road section is coded and divided according to the slope and the relationship between the upstream and downstream, and the data such as traffic flow density, speed, and vehicle type information obtained by the camera are used as model inputs to construct a dual-mechanism vehicle-following random model, and a traffic simulation platform is built for traffic simulation. The grid search method obtains the output value of th...
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The invention discloses a method for improving the stability of long uphill traffic flow based on variable speed limit. The method first codes and divides the road section according to the relationship between the slope and the upstream and downstream, and uses the traffic flow density, speed, vehicle model information, etc. acquired by the camera The data is used as model input, a dual-mechanism vehicle-following stochastic model is built, a traffic simulation platform is built for traffic simulation, and the output value of the variable speed limit is obtained through the grid search method, so as to guide the upstream vehicles on the long uphill to decelerate appropriately in advance to avoid Sudden speed change due to insufficient engine power on the uphill section. This method is mainly used for long uphill sections of urban expressways or expressways. According to the simulation results, the method significantly improves the stability of traffic flow, thereby reducing safety hazards, and at the same time, the method significantly reduces vehicle emissions on long uphill sections.
Description
technical field [0001] The invention belongs to the technical field of intelligent transportation, and in particular relates to a method for improving the stability of long uphill traffic flow based on variable speed limit. Background technique [0002] In recent years, smart transportation has developed rapidly. Traffic control methods such as ramp control, traffic guidance, and dynamic speed limit have changed the allocation of limited road resources, slowed down traffic congestion, and improved transportation efficiency and travel experience. However, none of the above methods and their extended versions focus on the instability of long uphill traffic flow. According to research [Tu Xu; Jorge Laval*; Driver Reactions to Uphill Grades: Inference from a Stochastic Car-Following Model, Transportation Research Record, 2020, 2674(11): 343-351.], the climbing speed of the vehicle is limited by the engine power, which is less than its free flow speed, so the sudden change of spe...
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IPC IPC(8): G08G1/01G08G1/052G08G1/065
CPCG08G1/0125G08G1/0137G08G1/052G08G1/065
Inventor 徐图季玮刘皓冰吴戡李道勋黄倩朱永东赵志峰
Owner ZHEJIANG LAB