A vehicle adaptive speed limit control method

Abstract

A vehicle adaptive speed limit control method, comprising the steps of: reading the actual driving torque, vehicle speed signal and slope signal of the vehicle, and using the vehicle dynamic model to calculate according to the signal, calculating the vehicle resistance curve of the vehicle, The calculation formula of resistance curve is F=mg*tan(slope)+mg*tan(slope)*u+0.5*AirCd*VehCrossArea*ρv 2 +m*a; Optimally select the maximum acceleration under the current vehicle and the acceleration of the preset best drivability, and calculate the target acceleration curve; read the target speed limit value, and calculate it in the step according to the target speed limit value Select the target acceleration at the current vehicle speed from the target acceleration curve; then compare the target acceleration with the current actual acceleration to calculate the target acceleration for control; use the target acceleration for control to recommend the target control torque to limit the actual output torque. Convert the control target value into the control quantity. When the limit speed is controlled, it can simulate the driver to predict the state of the vehicle in advance to achieve a good driving effect.

Description

technical field [0001] The invention relates to the field of vehicle control, in particular to a vehicle self-adaptive speed limit control method. Background technique [0002] At present, the world is vigorously developing new energy and intelligent driving, so the demand for maximum speed limit comes from this; the current speed limit algorithm is based on the actual vehicle speed and the maximum speed for PID closed-loop control. Although this control algorithm can achieve the function of limiting vehicle speed, but Due to the algorithm itself, the parameters are difficult to set, and the balance between speed overshoot and drivability has not been well resolved. As a result, some vehicles can control the speed overshoot but the drivability is extremely poor, and some vehicles can have good drivability. However, the speed overshoot cannot be limited, and there is a risk of harming the system; at the same time, because the current algorithm parameters can only be applied t...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the main purpose of the present invention is to provide a vehicle adaptive speed limit control method to solve the technical problems that plague new energy vehicle speed limit control parameters, such as difficult calibration of speed limit control parameters, poor parameter robustness, and poor balance between functions and performance.

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