PURGE CONTROL [SKYACTIV-G 1.5, SKYACTIV-G 2.0]


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Outline

•  Controls the purge solenoid valve according to the engine operation conditions to introduce an appropriate amount of evaporative gas into the intake manifold and prevent release of evaporative gas into the atmosphere while assuring the drivability.
•  The PCM drives the purge solenoid valve based on the signal from each control part.

Block Diagram

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Operation


Calculation method for purge flow amount

•  The PCM determines the drive duty based on the calculated purge flow amount. The drive duty is corrected by the intake air temperature and the battery voltage.


Determination of purge solenoid valve energization time

•  The PCM calculates the optimum purge flow amount according to mainly the evaporation density, intake air volume, and injection amount of the injector.


Operation condition

•  In evaporative purge control during normal driving, the PCM sends a duty signal to the purge solenoid valve when all of the following conditions are met.
―   Fuel injection control is in feedback zone (λ= 1)
―  Engine coolant temperature 60 °C {140 °F} or more