A speed limit method for pure electric vehicles based on dynamic calculation

Abstract

The present invention relates to the technical field of new energy vehicles, specifically a dynamic calculation-based pure electric vehicle speed limit method, S3: the micro-control unit detects whether the vehicle is faulty, if so, enters S4, and if not, enters S5, S4: Determine whether the vehicle speed is less than the fault vehicle speed V3, if yes, return to S3, if not, enter S6, S5: determine whether the vehicle speed is less than the low speed limit value V1, if yes, return to S3, if not, then Go to S6, S6: send the torque reduction signal to the micro control unit through the vehicle communication device, reduce the kp value and increase the ki value in the PID adjustment, reduce the torque and reduce the speed and enter S7, S7: adopt the dynamic adjustment method to make the whole The vehicle speed is maintained within the range of the target vehicle speed ±3km / h. The invention can control the maximum vehicle speed smoothly, significantly improve the ride comfort of the vehicle, and solve the vibration and abnormal noise caused by the system inertia.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a speed limit method for pure electric vehicles based on dynamic calculation. Background technique [0002] With the development of new energy vehicles, more and more attention has been paid to the quality of vehicles, and the safety requirements have also greatly increased. The current speed limit strategy is generally relatively simple, and the vibration and gearing of the transmission system during actual operation are also more obvious. In addition, the impact on the power grid is also large, and it is easy to cause damage to modules such as IGBTs, and the mechanical inertia and mechanical clearance of the entire vehicle are not considered. Contents of the invention [0003] The purpose of the present invention is to provide a speed limit method for pure electric vehicles based on dynamic calculation, so as to solve the problems raised in the above-mentioned bac...

AI Technical Summary

Problems solved by technology

[0002] With the development of new energy vehicles, more and more attention has been paid to the quality of vehicles, and the safety requirements have also greatly increased. The current speed limit strategy is generally relatively simple, and the vibration and gearing of the transmission system during actual operation are also more obvious. In addition, the impact on the power grid is also large, and it is easy to cause damage to modules such as IGBT, and the mechanical inertia and mechanical clearance of the whole vehicle are not considered.

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