PURGE CONTROL OPERATION [F2]

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Duty Control


Control outline

•  To obtain the optimum purge control, the PCM operates the purge solenoid valve by converting the target purge flow amount calculated by the engine conditions into the purge solenoid valve operation time.
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Purge solenoid valve operation time

•  The operation time of the purge solenoid valve is determined by adding corrections to the basic purge flow.
•  The basic purge flow is required according to engine speed and charging efficiency. The higher the engine speed is and the larger the charging efficiency is, the larger the basic purge flow becomes.


Correction

Item

Purpose

Condition

Action
Volume decrease correction after purge control start
To improve emission performance
For 5 s after purge control starts
Till 5 s after purge control starts → Correction decreases gradually
Acceleration volume decrease correction
To improve emission performance
According to engine speed
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Closed loop correction
To improve drivability
According to O2S closed loop condition
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Operation

•  The duty control is carried out when the vehicle is driven after engine warm-up and the control is in the closed loop zone.