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INCREASED EXHAUST TEMPERATURE WARM-UP FOR A RAPID LIGHT-OFF OF A CLOSE-COUPLED DIESEL OXIDATION CATALYST
INCREASED EXHAUST TEMPERATURE WARM-UP FOR A RAPID LIGHT-OFF OF A CLOSE-COUPLED DIESEL OXIDATION CATALYST
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机译：密闭式柴油氧化催化剂的快速起燃增加了排气温度
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摘要
A method is provided for generating rapid light-off for a diesel oxidation catalyst (DOC) close-coupled to a compression-ignition engine. The engine includes an intake passage in fluid communication with a combustion chamber, a throttle for controlling a flow of intake air through the intake passage, and an exhaust passage configured to channel an exhaust gas from the combustion chamber to the DOC. The method includes starting the engine to commence a warm-up thereof and regulating the throttle to restrict supply of the intake airflow to the combustion chamber. The method additionally includes injecting a predetermined amount of fuel into the combustion chamber during the engine's exhaust cycle such that the injected fuel is carried by the exhaust gas and burned in the exhaust passage. Regulating the throttle and injecting fuel during the warm-up of the engine together increase temperature of the exhaust gas for rapid light-off of the close-coupled DOC.
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