Crank case ventilation electronic control method and system

The invention discloses a crank case ventilation electronic control method, and the method comprises the following steps of (1) collecting internal pressure information of a crank case, and to be transmitteding the internal pressure information to an electronic control unit (ECU) to be processed so as to judge the pressure inside the crank case, continuing the step (1) if the pressure stays within the normal range, and entering a step (2) if the pressure exceeds the normal range; (2) an analysis and processing step, to be specific,: collecting information of a working state of a vehicle, transmitting the collected information to the ECU to be processed, adjusting the output current according to the working condition through the ECU, and controlling the openness of a valve plate of a pollution control valve (PCV); and (3) a feedback step, to be specific,: detecting the openness of the valve, transmitting the openness of the valve to the ECU to be processed, returning to the step (1) if the openness of the valve plate is identical to a preset value, and continuing the step (2) if the openness of the valve plate is not identical to the preset value. The real-time closed-loop control of an engine crank case ventilation system is realized by adopting an electronic control technology, so that the pressure of the crank case is maintained within a set range, and the pressure of the engine crank case is precisely controlled.