FE120 L4-4.9L DSL Turbo (2005)
EGR Valve Position Sensor: Description and Operation
Exhaust Gas Recirculation System
1.1 Overview
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In the exhaust gas recirculation system, the engine electronic control unit and multiple electronic drive units control the exhaust gas
recirculation valve and intake throttle in accordance with information from sensors on various aspects of the engine (engine speed, coolant
temperature, throttle opening, etc.).
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Exhaust gas recirculation involves the introduction of inert gases in the post-combustion exhaust emissions into the intake manifold. By
reducing the combustion temperature, it reduces the amount of nitrogen oxides (NOx), which are harmful, in the exhaust emissions. Further,
an exhaust gas recirculation cooler cools the recirculated exhaust emissions, thereby reducing the peak combustion temperature.
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The intake air quantity is adjusted by means of intake throttle control such that the effectiveness of exhaust gas recirculation is maximized.
1.2 Electronic control system
1. System block diagram
