Isuzu Motors Limited

Takehito Imai

Masashi Gabe

Naofumi Ochi

Tsuneo Suzuki

Hitoshi Sato

Yoshihisa Tashiro

Nobuyuki Hiraki

Daiji Nagaoka

Tatsuo Mashiko

Takao Onodera

Shinji Hara

Hitoshi Satou

Katsushi Osada

Mamoru Komine

Makoto Takeuchi

Takashi Urata

An exhaust purification system is equipped with: a linear exhaust pipe through which exhaust gas emitted from an engine passes; an injection nozzle that injects a reducing agent into the exhaust pipe at an oblique angle with respect to the axial direction of the pipe; a reduction catalyst that is provided in the exhaust system downstream from the injection nozzle, and that purifies the exhaust gas by causing the exhaust gas to react with the reducing agent; and a mixer member that is provided inside the exhaust pipe, downstream from the injection nozzle, and that causes the reducing agent to mix with the exhaust gas and diffuse. The mixer member includes multiple fins protruding downstream, and is arranged inclined inside the exhaust pipe such that the upstream surface thereof faces the injection opening surface of the injection nozzle.

Exhaust purification system

An exhaust emission control system including a continuous regenerating diesel particulate filter ('DPF') and a DPF controller, wherein a forced regenerator is operated by a driver's request, when it is judged that a traveling distance, after starting particulate matter collection, detected by a traveling distance detector has reached a predetermined judging traveling distance, even when the DPF controller detects that a collection amount detected by a collection amount detector is smaller than a prescribed judging collection amount. Accordingly, in a continuous regenerating DPF capable of manual regenerating, the number of warnings, such as a blinking regeneration button prompting a manual regeneration, is reduced to relieve a driver of annoyance or inconvenience.

Exhaust gas purifying system

The degree of a deterioration in catalyst is determined when the following requirements are satisfied: the operating state of an internal combustion engine (E) is in a predetermined operating state; and the temperature (T) of an exhaust gas, which flows into a catalyst (), is in a second temperature range (&#x394;T) in which the upper limit of the second temperature range (&#x394;T) is 10% below the upper limit of a first temperature range (&#x394;T) between the activation start temperature (Ta) and the activation end temperature (Tb) of the catalyst () before a deterioration and the lower limit of the second temperature range (&#x394;T) is 10% above the lower limit of the first temperature range (&#x394;T). A deterioration index temperature (Tic) is regarded as a shift level of light-off characteristics of the catalyst () toward the higher temperature side, and the deterioration index temperature (Tic) is added to the reference determination temperature (T) before the deterioration, and the sum is used as the determination temperature (T) for exhaust gas temperature raising control. According to the above constitution, the degree of deterioration of the catalyst () can be estimated without using a concentration sensor for an exhaust gas component such as an NOx concentration sensor with high accuracy, and the worsening of the state of the exhaust gas is suppressed while minimizing the worsening of the fuel consumption.

Method for control of exhaust gas purification system, and exhaust gas purification system

An exhaust gas control system () comprised with a continuous regeneration-type DPF (), an exhaust throttle valve () and a DPF control means (C), wherein the regeneration control is suspended, the multi injection control is performed, and the exhaust throttle valve is closed, when detecting a-stop condition of the vehicle during the regeneration control of the continuous regeneration-type diesel particulate filter device () by the regeneration means. Thereby, concerning the regeneration of the continuous regeneration-type DPF device (), the DPF can be regenerated securely by burning PM efficiently even in a traveling pattern of frequent waiting for the traffic lights to change in urban areas.

Control method for an exhaust gas purification system and an exhaust gas purification system

An internal combustion engine exhaust gas purifying system () having a continuous regenerating diesel particulate filter system () on the exhaust passage () of an internal combustion engine () is constituted by including collected-quantity estimation means (A) for estimating the quantity of collected particulate matter in a filter () of the filter system for collecting the particulate matter and maximum-fuel-injection-quantity restricting means (C) for restricting the maximum fuel injection quantity of the internal combustion engine () when the quantity of collected particulate matter estimated by the collected-quantity estimation means (A) is equal to or more than a predetermined judgment value. Thereby, when the quantity of deposited particulate matter exceeds a predetermined value in the continuous regenerating DPF system (), it is possible to prevent the continuous regenerating DPF system () from deteriorating by restricting the maximum fuel injection quantity of the internal combustion engine () and avoiding a great increase of an exhaust gas quantity.

Internal combustion engine exhaust gas purifying system

To provide an exhaust gas purifying method for purifying the exhaust gas of an internal combustion engine () by an exhaust gas purifying system () having an oxidation catalyst (), which comprises the steps of estimating the quantity of unburnt hydrocarbon accumulated in a support of the oxidation catalyst (), performing a hydrocarbon removal control when an estimated accumulation quantity (Vhc) of the unburnt hydrocarbon exceeds a predetermined judgment value (Vhc) and raising an exhaust gas temperature (T) to activate the oxidation catalyst () and oxidizing and removing the accumulated unburnt hydrocarbon. Thereby, it is possible to prevent a white fume from being produced after a low exhaust temperature state of an idling operation or the like continues for a long time.

Exhaust gas purifying method and exhaust gas purifying system

A regeneration control method for regenerating a continuously regenerating diesel particulate filter device capable of regenerating a filter by efficiently removing PM while suppressing the deterioration of fuel consumption and preventing a drivability from being deteriorated, wherein the clogged-state of the filter is judged in three or more phases of the clogged-state and, when the clogged-state of the filter reaches a specified phase, a specified regenerating mode operation set in correspondence with the reached phase is performed.

Regeneration control method for continuously regenerating diesel particulate filter device

Regenerative control method for continuous regenerative diesel particulate filter device

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

Exhaust gas purification system and method for controlling regeneration thereof

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.

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Fujisawa, Japan

Takehito Imai