Vehicle speed control method, vehicle speed control system and vehicle of electric vehicle

Abstract

The invention discloses a vehicle speed control method and vehicle speed control system of an electric vehicle and a vehicle. The vehicle speed control method comprises the following steps that a vehicle controller calculates torque required by the vehicle and sends a torque command to a motor controller; the motor controller calculates the vehicle torque and judges whether the absolute value of the difference between the vehicle torque and the required torque of the vehicle is less than a predetermined first torque difference or not; if yes, the torque command is executed, and otherwise, a drive motor is controlled to carry out torque limiting output; after the motor controller executes the torque command, the vehicle controller judges whether the absolute value of the difference betweenthe actual torque of the vehicle and the required torque of the vehicle is less than a predetermined second torque difference or not; and if not, a torque limiting command is sent to the motor controller, so that the motor controller controls the drive motor to carry out torque limiting output. Therefore, the state of the vehicle can be monitored by the motor controller and the vehicle controllercorrespondingly to ensure the power output safety and system reliability of the electric vehicle.

Description

Technical field[0001]The present invention relates to the field of vehicle technology, in particular to a vehicle speed control method of an electric vehicle, a vehicle speed control system of an electric vehicle, and a vehicle.Background technique[0002]In recent years, with the continuous improvement of people's quality of life, vehicles have gradually entered common people's homes and have become a means of transportation for the majority of people. For vehicles, such as electric vehicles, if the acceleration or deceleration generated within a certain period of time during operation is greater than a certain value, it may cause a collision with the vehicle in front, or cause a rear-end collision of the vehicle behind, which may cause damage to personnel and property. loss.[0003]At present, in related technologies, electric vehicles usually consider individual components to solve the above-mentioned problems, such as VCU (Vehicle Control Unit, vehicle controller), or MCU (Micro Con...

AI Technical Summary

Problems solved by technology

For vehicles, such as electric vehicles, if the acceleration or deceleration generated within a certain period of time is greater than a certain value during operation, it may cause a collision with the vehicle in front, or cause a rear-end collision with the vehicle behind, which will cause damage to personnel and property. loss

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