EXHAUST GAS TREATMENT SYSTEM FOR LOW EXHAUST TEMP. VEHICLE

摘要

An exhaust gas treatment system for a low exhaust temperature vehicle is provided to regenerate a catalyst by injecting small amount of diesel to a diesel particulate filter and a diesel oxidation catalyst, burning the injected diesel through the use of the diesel oxidation catalyst, raising the temperature of exhaust gas and the filter through the use of heat generated during burning, and burning soot. An exhaust gas treatment system for a low exhaust temperature vehicle, comprises a soot reduction unit and a diesel injector. The soot reduction unit is arranged in an engine exhaust pipe, and includes a diesel oxidation catalyst and a diesel particulate filter. The diesel oxidation catalyst raises the temperature of exhaust gas by burning organic matters in the exhaust gas, and the diesel particulate filter has a temperature raised by the exhaust gas with raised temperature and burns particles of soot. The diesel injector is arranged to inject diesel fuel into a front end of the diesel oxidation catalyst of the soot reduction unit.