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15-35 0000-00 HFM (intake air temperature) CDPF Electric throttle body Coolant temperature sensor Oxygen sensor Injector (C3I) E-EGR valve (11) Wide band oxygen sensor control A. Overview For diesel engine, combustion is not performed at the optimum (theoretically correct) air-fuel ratio and the oxygen concentration is thin in most cases. So the wide-band oxygen sensor is used for this kind of engine, and this sensor is a little different from the one that used for gasoline engine. The combustion in diesel engine is controlled by fuel injection volume. Therefore, the wide band oxygen sensor should be used in diesel engine. This sensor measures the air-fuel ratio in very wide range, and is also called full range oxygen sensor. The wide band oxygen sensor measures the oxygen density in exhaust gas and sends it to ECU to control the EGR more precisely. - B. Components D20DTR ECU |