Isuzu Motors Limited

Yoshihisa Tashiro

Masashi Gabe

Naofumi Ochi

Takehito Imai

Tsuneo Suzuki

Takao Onodera

Takashi Haseyama

Takuro Iwashita

Hidetaka Shibata

Takeshi Igarashi

An exhaust gas purifying system causes less torque fluctuation and is capable of preventing the occurrence of white smoke in a regeneration control operation for regenerating a continuous regeneration DPF. When the continuous regeneration DPFwith an oxidation catalystAa on the upstream side of a filterAb is controlled to regenerate, an exhaust throttle valveprovided in an exhaust passageis closed and a delay multi-step injection control is performed to increase the temperature of the exhaust gas if an exhaust temperature Tat the inlet of the oxidation catalystAa is less than the activation temperature Ta of the oxidation catalyst. After the exhaust temperature Tat the inlet of the oxidation catalystAa has risen to the activation temperature Ta of the oxidation catalyst or higher, the exhaust throttle valveis opened in a stepwise or continuous manner so that the exhaust temperature Tat the inlet of the filterAb rises to a lower limit temperature of PM forced combustion Tbor higher.

Exhaust gas cleaning system

To provide an exhaust gas purifying system capable of forcibly regenerating DPF by efficiently raising the temperature of exhaust gas even when an exhaust gas temperature is very low at the time of low load and low engine speed such as an idling operation. In an exhaust purifying system () having an exhaust throttling valve () and a DPF () in an exhaust passage and having regeneration control means (P) for regenerating the DPF (), the regeneration control means (P) is provided with an exhaust gas temperature detection means (P), a fuel injection control means (P), and an exhaust throttling control means (P) and includes regeneration control for performing the exhaust gas temperature raising control through the multistage delay injection by the fuel injection control means (P) and through the exhaust throttling of the exhaust throttling valve ().

Exhaust gas purifying system

The present invention concerns an diesel engine fuel injection control, and a regeneration control method of exhaust gas post-treatment apparatus using this fuel injection control, and the engine fuel injection control for performing after injections (Fas, Fam) after a main injection (Fm) for activation and regeneration of the exhaust gas post-treatment apparatus, through the rising of diesel engine exhaust gas temperature or the decrease of the oxygen concentration in the exhaust gas, is composed to perform the after injections (Fas, Fam) in a range of 40&#xb0; ATDC to 90&#xb0; ATDC of the crank angle. Whereby, the main injection can be burned, without misfire, even when the main injection is largely retarded, or, the injection quantity is increased/decreased, and the engine operation can be sustained, by keeping the engine combustion in a good state.

Fuel injection control method for diesel engine and regenerative control method for exhaust gas after treatment device

A diesel particulate filer unit comprising a filter for capturing particulates in the exhaust gas G of an engine E, and a regeneration control means judging the start of the regeneration operation of said filter , according to the comparison between the value measured by exhaust pressure sensors and a predetermined exhaust pressure judgment value &Dgr;Pes, Pes, Res wherein said regeneration control means is configured to estimate the ash accumulated quantity SAsh of ash leaked into the exhaust gas G and accumulated in said filer and correct said exhaust pressure judgment value &Dgr;Pes, Pes, Res for judging the regeneration operation start based on this. Thereby, a diesel particulate filter that can judge the regeneration start timing appropriately, taking accumulation and deposit of ash generated from lubricant oil on the filter into consideration, and remove particulates efficiently all the way preventing the filter from clogging is provided.

Diesel particulate filter unit and regeneration control method of the same

Apparatus for diminishing nitrogen oxides

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Fujisawa, Japan

Yoshihisa Tashiro