Vehicle speed control method and system, and vehicle

Abstract

The invention provides a vehicle speed control method and system, and a vehicle. The vehicle speed control method comprises the steps that under the situation that it is detected that the difference value between the current vehicle speed and the maximum vehicle speed limit value is less than or equal to a preset value, a target vehicle speed curve changed from the current vehicle speed to the maximum vehicle speed limit value is constructed; according to the current vehicle speed and the target vehicle speed of the target vehicle speed curve at the current moment, a limited torque value is calculated; under the situation that it is detected that a driver steps on an accelerator pedal, a corresponding demanded torque value is obtained; and the smaller one of the limited torque value and the demanded torque value serves as a target torque value to control a motor of the vehicle. According to the vehicle speed control method, when the vehicle speed does not reach the maximum vehicle speed limit value yet, the speed-limiting request is activated in advance, by constructing the target vehicle speed curve, the vehicle speed can be controlled below the maximum vehicle speed limit value in advance or in time, thus it can be guaranteed that the rotating speed of the motor is within the normal working range, and the property and the service life of the motor are guaranteed.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of vehicle speed control, in particular to a vehicle speed control method, a vehicle speed control system and a vehicle. Background technique [0002] At present, when limiting the maximum speed of a vehicle, a common method is to detect the current vehicle speed in real time, and when the current vehicle speed is higher than the maximum speed limit value, activate the speed limit request to control the current vehicle speed within the maximum speed limit value. [0003] However, since the existing solution activates the speed limit request only when it is judged that the current vehicle speed is higher than the maximum speed limit value, the actual vehicle speed will exceed the maximum vehicle speed limit value for a period of time due to the delay of control intervention and the inertia of the vehicle itself. Only then can the current speed be controlled within the maximum speed l...

AI Technical Summary

Problems solved by technology

[0003] However, since the existing solution activates the speed limit request only when it is judged that the current vehicle speed is higher than the maximum speed limit value, the actual vehicle speed will exceed the maximum vehicle speed limit value for a period of time due to the delay of control intervention and the inertia of the vehicle itself. Only then can the current speed be controlled within the maximum speed limit

When the vehicle speed exceeds the maximum speed limit, the motor speed will exceed the normal working load of the motor, which will affect the performance and service life of the motor

[0004] It can be seen that the existing vehicle speed control method has the problem of poor control effect

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