Cruise control method and device of electric vehicle

Abstract

The invention provides a cruise control method and device of an electric vehicle. The cruise control method comprises the following steps of receiving a constant speed cruise request in accordance with the electric vehicle, wherein the request carries a cruise set vehicle speed v <stp>; calculating a difference value delta v between the cruise set vehicle speed v <stp> and a current vehicle speed v according to the formula delta v=v-v <stp>; calculating an average amending acceleration a <m> required by the vehicle in a preset amending cycle delta t according to the formula a <m> = delta v / delta t; and according to the average amending acceleration a <m>, calculating cruise requiring torque, and using the cruise requiring torque to drive the vehicle to travel. According to the cruise control method disclosed by the invention, in the cruise control process, the stability and the comfortableness of the electric vehicle are improved, and the constant speed cruise developing and calibrating working capacity is reduced, so that the constant speed cruise control of the electric vehicle is rapid in response and high in robustness.

Description

technical field [0001] The invention relates to the technical field of driving control of electric vehicles, in particular to a cruise control method and device for electric vehicles. Background technique [0002] The constant speed cruise control function of the vehicle can enable the driver to drive the vehicle at the set speed without stepping on the accelerator pedal during long-term driving, which greatly reduces driving fatigue. At present, the popularity of new energy vehicles is gradually increasing. In addition to ordinary transportation, people also put forward higher requirements for the comfort and convenience of electric vehicles. [0003] For vehicles equipped with constant speed cruise function, when the driver activates the cruise function, the cruise control usually uses the deviation between the actual vehicle speed collected by the speed detection unit and the cruise speed set by the driver as the cruise control signal to adjust the motor drive power to e...

AI Technical Summary

Problems solved by technology

At present, most cruise control systems control the vehicle speed by adjusting the motor torque through PI (Proportional Integral). This method is convenient to apply, but in order to adapt to the widely used cruise speed set point, such as 30-120Km / h, its parameter calibration The matching workload is very large, and because in the actual driving application scenario, the vehicle speed fluctuates sharply due to different driving conditions such as uphill and intermittent roads, the above control method cannot meet the needs of stable and comfortable cruise control

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