Electric vehicle, cruise control system thereof and cruise control method therefor

Abstract

The invention discloses a cruise control method for an electric vehicle comprising detecting if a target vehicle is on the front road within a visual field; determining a relative speed and a first safety distance if the target vehicle is in the visual field; further determining an actual lateral distance if an actual longitudinal distance is less than the first safety distance; determining if the actual lateral distance is greater than a second safety distance; ignoring the target vehicle and maintaining a target cruise state if the actual lateral distance is greater than the second safety distance and the absolute value of the relative speed between the electric vehicle and the target vehicle is greater than the speed of the electric vehicle self; otherwise performing an adaptive cruise. By checking the target vehicle, the cruise control method for the electric vehicle provided by the invention has the advantages of increasing the accuracy of the monitoring on the target vehicle, ensuring the safety and comfort of the electric vehicle, improving the experience of a user and being simple and convenient. The invention also discloses a cruise control system of the electric vehicle and the electric vehicle with the cruise control system.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to an electric vehicle and its cruise control system and cruise control method. Background technique [0002] In related technologies, ACC (Adaptive Cruise Control, adaptive cruise control system) mainly controls vehicle speed through engine throttle control and appropriate braking. Pure electric vehicles can use regenerative braking or ESP (Electronic Stability Program, electronic body stability program) system) to slow down. [0003] Specifically, refer to figure 1 As shown, according to the real-time radar monitoring distance to the vehicle in front and the current vehicle speed, it is judged whether it is necessary to decelerate. When deceleration is required, the vehicle controller sends an appropriate torque to the motor controller, and the motor brake is used first to recover electric energy. That is to say, the ACC in the related art is mainly based on the fact that the d...

AI Technical Summary

Problems solved by technology

[0004] However, there are certain potential safety hazards in the control method in the related technology. First, the radar target detection of the adaptive cruise system has a certain angle. The cost lane target, as the distance between the two vehicles approaches, the adaptive cruise system will take unnecessary braking; secondly, the electric vehicle uses a high-voltage battery as the power source, driven by a motor, and when the adaptive cruise system needs to brake Dynamic feedback is indeed a good way to increase the mileage of electric vehicles, but it does not consider whether the state of the battery allows braking feedback to occur, and the magnitude of the braking feedback torque does not consider the rechargeable capacity of the battery

Therefore there is certain defect in the control method of vehicle in the related art, needs improvement badly

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