Vehicle speed control method and system for constant speed cruise within full vehicle speed range

The invention discloses a vehicle speed control method and system for constant speed cruise within a full vehicle speed range. The method includes the steps: judging whether control instructions of setting cruise speed by a driver are received or not in real time; responding to the control instructions of setting the cruise speed by the driver, acquiring the set cruise speed by analysis and acquiring the current vehicle speed and accelerated speed of a vehicle; calculating an accelerated speed change curve of the vehicle according to the vehicle speed, the accelerated speed and the set cruise speed, and planning the speed of the vehicle; calculating the current slope of the vehicle, calculating and outputting motor torque according to speed planning results, and controlling the speed of the vehicle. The vehicle speed can be stably controlled, dependency on artificial experience is low, automatic calculation speed is high, short time is consumed in the control process, the problem of vibration caused by a PID