Mazda CX-5 Service & Repair Manual: Purge Control
Outline
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An appropriate amount of evaporative gas is fed into the intake manifold by the purge solenoid valve operation according to the engine operation conditions. This ensures driveability and prevents release of evaporative gas into the atmosphere.
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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 determines energization time based on purge flow amount. In addition, it corrects the energization time according to fluctuations in battery positive voltage (the lower the rate of battery positive voltage, the longer the energization time).
Calculation method for purge flow amount
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The PCM determines the purge flow amount through the addition of each correction to the target purge flow amount.
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Contents |
Calculation or determination method of purge flow amount and correction |
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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. |
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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.
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Volume decrease correction |
Purpose: Decreases the purge flow amount and stabilizes the air/fuel ratio.
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Purge control image
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 (?=1)
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Engine coolant temperature 60 °C {140 °F} or more
Pressure Sensor [Two Step Deployment Control System]
Purpose
The pressure sensor determines at an earlier stage whether to detonate the
air bag on the side of the vehicle (around front door) receiving an impact.
This is for improved accurac ...
Room Light Control System
Outline
The room light control system changes the illumination condition and illumination
level of the interior lights (door position) according to whether the doors
are opened/closed and ...
Other materials:
Liftgate Latch And Lock Actuator Inspection
The following actuator and switch are integrated with the liftgate latch
and lock actuator.
From the actuator/switch name and operation in the following table, select
the actuator or switch to be inspected, and perform the inspection following
the inspection procedure desc ...
Rear Drive Shaft
Purpose, Function
Engine noise and vibration have been reduced due to adoption of a bell joint
on the wheel side of the constant velocity joint.
A low noise and vibration double offset joint with low slide resistance has
been adopted for the differential side of the constant vel ...
Airflow Volume Control [Full Auto Air Conditioner]
Purpose
The airflow volume control changes the airflow volume according to the vehicle
environment.
Function
The airflow volume control changes the operation of the blower motor according
to the operations of the airflow volume control dial or temperature control
dial an ...
