The invention relates to an
electric vehicle speed control system and control method based on PID control, and solves the problems of slow vehicle speed adjustment, overshoot and the like of a current
vehicle control system. Comprising a speed error input module, a
PID controller and a torque output module. Comprising the following steps that 1, the current vehicle speed V1, the maximum vehicle speed V, the current motor rotating speed Spd1 and the
motor torque T1 are obtained; 2, according to the current rotating speed Spd1 of the motor, the required torque T2 of the motor at the next moment is obtained; 3, a step-by-step
PID regulator is set, the first-stage regulation
limit value is M1, and the second-stage regulation
limit value is M2; when V-V1gt; when M1 is greater than M1, the P value is increased to enable the vehicle speed V to approach the maximum vehicle speed V; when M2lt; v-V1lt, V-V1lt; when M1 is greater than M1, the P value is reduced, and the I value is increased to prevent
system overshoot; 4, when the vehicle speed error is smaller than the second-level
limit value M2, control is stopped so that the vehicle speed can be stabilized at the target speed; and 5, limiting the upper and lower limits of integration to avoid the problem of integration saturation. According to the invention, the vehicle speed can be controlled more accurately and stably.