PURGE CONTROL [SKYACTIV-G 2.0, SKYACTIV-G 2.5]
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Outline
Block Diagram
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Operation
Determination of purge solenoid valve energization time
Calculation method for purge flow amount
Contents |
Calculation or determination method of purge flow amount and correction |
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Target purge flow amount
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The target purge flow amount is determined by multiplying the correction for the intake air temperature and the fuel evaporative gas concentration with the purge mass volume. The purge mass volume is calculated from the purge intake rate for the intake air mass volume which differs according to engine conditions.
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Correction
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Startup correction
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Purpose: Prevents a change in the air/fuel ratio due to a purge intake lacking evaporative gas concentration in the charcoal canister.
During purge control startup
• Determined according to the target purge flow amount.
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Volume decrease correction
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Purpose: Decreases the purge flow amount and stabilizes the air/fuel ratio.
Unstable combustion condition (feedback correction value for fuel injection control is unstable)
• Determined according to the A/F sensor feedback conditions.
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Purge control image
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Operation condition