PURGE CONTROL [SKYACTIV-X 2.0]
id0140hf203800
Outline
• By performing the purge control according to the engine operation conditions, an appropriate amount of evaporative gas is introduced into the supercharger to prevent release of evaporative gas into the atmosphere while ensuring drivability.
• The PCM drives the purge solenoid valve based on the signal from each control part.
Block Diagram
Operation
Determination of purge solenoid valve energization time
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• The PCM calculates the optimum purge flow amount according to mainly the evaporation density, intake air volume, and injection amount of the injector.
Calculation method for purge flow amount
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• 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.
Operation condition
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• 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.
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― Fuel injection control is in feedback zone (λ=1)
― Engine coolant temperature 60 °C {140 °F} or more
