EVAPORATIVE PURGE CONTROL OPERATION


BHE014000140T35

Evaporative Purge Control Execution Condition

• When the following conditions are met, the evaporative purge control sends a duty signal to the purge solenoid valve.

– During fuel injection control feedback
– Fuel system and MAF sensor are normal
– Approx. 30 s have elapsed since engine start
– ECT is 60°C {140°F} or more

Determination of Purge Solenoid Valve Energization Period

• The duty ratio of the duty signal (ratio of on time per 1 cycle) is calculated based on the amount of purge flow and the differential pressures of the injectors. The amount of purge flow is determined by the estimated intake air passage pressure and BARO calculated by the engine speed and charging efficiency. The differential pressure of the injectors is determined by the BARO and the estimated intake air passage pressure.