Exhaust Gas Recirculation System; Structure And Operation - Mitsubishi 6M70 Workshop Manual

STRUCTURE AND OPERATION

1. Exhaust Gas Recirculation System

1.1 Overview
• In the exhaust gas recirculation system, various engine-related information (engine speed, water temperature, ac-
celerator position) is collected by the relevant sensors and is sent to the engine electronic control unit and EGR
EDU which then control the EGR magnetic valves based on the information received.
• EGR achieves lower combustion temperatures by reintroducing combusted exhaust gas (which contains inert
gases) into the intake manifold. This has the effect of reducing the amount of harmful NOx (nitrogen oxides)
formed in the engine. The EGR cooler enhances the NOx (nitrogen oxides) reducing performance of the EGR
system by cooling the mixed exhaust gas to lower maximum combustion temperature.
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