Vehicle self-adaptive speed limiting control method

Abstract

The invention discloses a vehicle self-adaptive speed limiting control method. The method comprises the following steps: reading an actual driving torque, a vehicle speed signal and a slope signal ofthe whole vehicle; using a whole vehicle dynamic model for calculation according to the signals, and calculating a whole vehicle resistance curve of the vehicle, wherein the calculation formula of theresistance curve is F = mg * atan (slope) + mg * atan (slope) * u + 0.5 * Aircd * VehCrossArea * v2 + m * a; carrying out optimal selection through the maximum acceleration under the current vehicleand the preset acceleration with the optimal drivability, and calculating a target acceleration curve; reading a target speed limit value, and selecting a target acceleration at the current vehicle speed from the target acceleration curve calculated in the step according to the target speed limit value; comparing the target acceleration with the current actual acceleration, and calculating the target acceleration for control; the target control torque is reversely recommended through the target acceleration for control, and the actual output torque is limited, so the control target value is converted into the control quantity. When the limit vehicle speed is controlled, a driver can be simulated to predict the state of the whole vehicle in advance, and a good driving effect is achieved.

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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