The invention discloses a turbocharging control method and
system, and an engine. The control method comprises the steps that the rotating speed of the engine and the position
signal of an acceleratorpedal are read, and the change rate of the position
signal of the accelerator pedal is calculated according to the position
signal of the accelerator pedal; if the change rate of the position signalof the accelerator pedal is greater than a signal threshold value or the change rate of the rotating speed of the engine is greater than a rotating speed threshold value, a
turbocharger goes into theinstantaneous condition; the
turbocharger goes into the steady-state condition if the change rate of the position signal of the accelerator pedal is less than the signal threshold value or the changerate of the rotating speed of the engine is less than the rotating speed threshold value; if the
turbocharger is under the steady-state condition, an
engine management unit reads a demand signal and calculates the
supercharge pressure; under the condition of determining the
supercharge pressure ratio, the working point of the turbocharger is changed thorough an electronic
actuator; if the turbocharger is under the instantaneous condition, the
engine management unit reads the demand signal and calculates the
supercharge pressure; under the condition of determining the supercharge pressure ratio, closed-
loop control is conducted through the electronic
actuator to improve the turbocharging efficiency. Through the turbocharging control method, the control precision and the response efficiencycan be improved.