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After the ignition switch turns off, the engine-ECU actuates the exhaust gas recirculation
valve from the fully closed position to the fully open position. Then, it records the fully
closed/open value learned from the exhaust gas recirculation valve position sensor output signals.
The learned values that are recorded will be used for compensation purposes when the exhaust
gas recirculation valve is to be actuated subsequently.
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The exhaust gas recirculation valve position sensor is integrated with the exhaust gas
recirculation valve.
This exhaust gas recirculation valve position sensor uses Hall IC and is of non-contact
type.
Exhaust gas recirculation valve position sensor outputs voltage to engine-ECU based on
the exhaust gas recirculation valve opening angle.
Engine-ECU uses this signal to detect stroke of the exhaust gas recirculation valve.
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An exhaust gas recirculation valve is installed on inlet manifold.
Exhaust gas recirculation valve is composed of a good response, low energy, and small
DC motor with brush and can generate rotation force corresponding to the current applied on the
coil.
Engine-ECU changes current direction according to the Open/Close direction and also changes
current to the motor coil in order to the control exhaust gas recirculation valve.
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Exhaust gas recirculation cooler, which is installed between the exhaust manifold and
the exhaust gas recirculation valve, is a laminated type.
Exhaust gas recirculation cooler lowers the temperature of the exhaust gas that is recirculated
in order to enhance the charging efficiency of exhaust gas recirculation.
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