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HEATED OXYGEN SENSOR (HO2S) HEATER CONTROL OUTLINE

BHE014000140T39

• Stabilized oxygen concentrations, even when the exhaust gas temperature is low, are detected by controlling of the HO2S, enabling feedback control of the fuel injection control even during cold-engine starting, improving emission performance when cold.

• When the exhaust gas temperature is high, the HO2S is protected from sharp rises in its temperature by stopping energization to the O2S heater.

• Emission performance improvement and protection of the HO2S have both been achieved by the duty control of the front and rear HO2S according to the engine operation conditions (exhaust gas temperature).