A curve fitting modeling method based on vehicle behavior adjustment model for the calculation of optimal car-following distance

Abstract

The invention presents a curve fitting modeling method for calculating the optimal distance between cars in the field of transportation. According to the control requirements of the vehicle during theparking and running process, a mathematical model which can scientifically reflect the dynamic behavior characteristics of vehicles during parking operation is established, where v0 is the initial speed at which the vehicle begins to brake and decelerate, k and tau are constants greater than 0, delta is a slight velocity increment greater than 0, t is a time variable, v is a velocity variable (the range of V is shown in the specification), tanh () denotes a hyperbolic tangent function. As the vehicle behavior adjustment model is based on the vehicle behavior adjustment model, a curve fittingmethod of dynamic optimal distance between car and car is proposed, and used for real-time calculation of dynamic optimal car-following distance. The method can create conditions for safe and efficient car-following operation with smooth (comfortable) and fast behavior adjustment process, and can also provide technical support for traffic management department, vehicle manufacturing industry to improve the automation level of vehicles, reduce engineering experiment cost and provide technical support.

Description

technical field [0001] The invention relates to the field of transportation. Based on a scientific vehicle behavior adjustment model, a curve fitting modeling method for calculating the optimal following distance is proposed, in order to determine the optimal following distance of the vehicle and ensure that the vehicle can Create conditions for safe and efficient car-following operation with a smooth (comfortable) behavior adjustment process. [0002] It is especially suitable for automatic driving of various vehicles. Background technique [0003] In the process of car-following operation, the optimal distance between the front and rear vehicles, that is, the optimal car-following distance, is obviously not a fixed variable for the sake of safety, efficiency, and the stability and rapidity of self-behavior adjustment. changed value. For any moment of car-following operation, what is the value of the car-following distance? Is the car-following operation of the vehicle sa...

AI Technical Summary

Problems solved by technology

Since the dynamic safety vehicle distance involves many parameters such as speed and control strategy, its complexity is mainly manifested in "each parameter has an infinite number of values, and its combinations are even more difficult to exhaust". Engineering experiments for establishing an accurate fitting function It will be a large number, but it must also be limited to be feasible in engineering. A large number of engineering experiments cost a huge amount of money, and the limited number of experiments makes the accuracy of the fitting function questionable.

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