Chevrolet Spark manuals

Mazda CX-5 Service & Repair Manual: Purge Control

Outline

Block Diagram


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

Target purge flow amount

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.

Correction

Startup correction

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.

Volume decrease correction

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.


Purge control image


Operation condition

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Room Light Control System
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Other materials:

Not P Position Switch Inspection
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Air Fuel Ratio (A/F) Sensor Heater Control [Skyactiv G 2.0]
Outline Based on the control of the A/F sensor heater, a stabilized oxygen concentration is detected even at low exhaust temperatures, and feedback control of fuel injection even at cold engine start is made possible for improved cold temperature exhaust emission performance. ...

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