Cruise control method and device for electric vehicle

Abstract

The invention discloses a constant speed cruising method for an electric vehicle and a device. The method comprises steps: whether the electric vehicle enters a constant speed cruising mode is judged, and if the electric vehicle is determined to enter the constant speed cruising mode, a cruising rotation speed instruction is calculated; and according to the state of a motor of the electric vehicle, whether the cruising rotation speed instruction needs to be corrected is judged, if the cruising rotation speed instruction needs to be corrected, a cruising rotation speed instruction after correction is acquired, the cruising rotation speed instruction after correction is outputted to a motor controller, and constant speed cruising of the electric vehicle is realized. According to the constant speed cruising method and the device of the embodiment, according to the state of the motor of the electric vehicle, the cruising rotation speed instruction after correction is outputted to the motor controller, constant speed cruising of the electric vehicle is realized, overload working of the motor can be effectively prevented, the motor enters an over-current protection state, reliability of constant speed cruising control and safety of the vehicle are improved, and the complexity degree and the cost of constant speed cruising control are reduced.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a constant-speed cruise method and device for an electric vehicle. Background technique [0002] Due to the gradual warming of the global climate and the depletion of oil resources, the development of new energy vehicles has attracted more and more attention. With the development of the electric vehicle industry, users' requirements for electric vehicles are not only simple transportation, but also the practicability and diversity of their functions. Among them, the cruise control function is highly expected by users. The traditional car cruise control system can realize constant speed cruise through the torque closed-loop control method, so that the driver can set the speed of the vehicle at a fixed speed without stepping on the accelerator pedal, so that the vehicle can run according to the set speed, thereby greatly reducing the Fatigue from long drives. [0003] For el...

AI Technical Summary

Problems solved by technology

[0004] However, the control process using the analog speed closed-loop control method is very complicated and requires a lot of calibration work, and when the road conditions change, the actual output torque of the motor will change accordingly, which will affect the constant speed cruise control and make the electric vehicle The structure is more complicated and the cost is higher; with the speed control method, under certain working conditions, the actual power of the motor will increase, and under the premise that the high-voltage voltage of the vehicle is relatively stable, the working current of the motor will increase accordingly , which may cause the motor to enter the over-current protection state and fail to work normally

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