2016 – MX-5 – Engine

PURGE CONTROL [SKYACTIV-G 2.0]

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

Operation

Calculation method for purge flow amount

• The PCM calculates the purge flow amount in which the intake airflow amount and the amount of fuel vapor gas passing through the purge solenoid value are a certain ratio. The purge flow amount is corrected by the fuel vapor gas concentration and the intake air temperature.

Determination of purge solenoid valve energization time

• The PCM determines the drive duty of the purge solenoid valve through which the purge flow amount passes. The drive duty value is corrected by the battery voltage.

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

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