Yanmar Co., Ltd.

Shusuke Okada

Hitoshi Adachi

Tomohiro Otani

Masato Kitazaki

Hiroshi Uehara

Akihiro Nishimura

Hiroshi Omote

Michihiko Hara

Yuuji Kawabata

Osamu Kawatate

An exhaust purification apparatus which comprises: a first processing unit for removing particulate matter; a second processing unit for reducing nitrogen oxide; a communication pipe for guiding exhaust from an exhaust outlet of the first processing unit to an exhaust inlet of the second processing unit; and a reducing agent supply unit on the communication pipe. The first and second processing units are arranged in parallel such that the exhaust outlet and the exhaust inlet are on the sides facing each other. The communication pipe is arranged between the first and second processing units where the processing units are closest to each other such that the upstream part of the communication pipe extends from the exhaust outlet along the outer circumferential surface of the first processing unit and the downstream part of the communication pipe extends along the outer circumferential surface of the second processing unit to the exhaust inlet.

Exhaust purification apparatus

The purpose of the present invention is to provide an engine having a revision means which regulates rotation speed of each of cylinders while reflecting specific unevenness of rotation of each of the cylinders. With regard to an enginehaving a plurality of cylinders wherein opening timing of each of injectorscan be controlled respectively, comprising an individual standard rotation speed output unitwhich outputs individual standard rotation speed Nstdi of each of the cylinders following fuel injection of the corresponding injectorwhen all the injectorsare in normal state, an engine rotation speed sensorwhich detects individual actual rotation speed Ni of each of the cylinders following the fuel injection of the corresponding injector, and a revision amount calculation unitwhich calculates revision amount of fuel injection amount to each of the cylinders from the corresponding injectorbased on difference between the individual standard rotation speed Nstdi stored in the individual standard rotation speed output unitand the individual actual rotation speed Ni calculated by the engine rotation speed sensor

Engine

In an engine which may show a behavior where an engine speed is not always minimized after compression top dead center of a cylinder in which poor fuel injection occurred, the cylinder in which poor fuel injection occurred is detected. A common rail diesel engine () includes a individual reference number-of-revolutions output unit () for outputting the individual reference number of revolutions Nstdi of each cylinder corresponding to each injector () incident to fuel injection thereof, an engine speed sensor () for calculating the individual actual number of revolutions Ni of each cylinder corresponding to each injector () incident to fuel injection thereof, and fuel injection failure detection means for judging a cylinder temporarily judged as poor fuel injection as a cylinder of poor fuel injection when the plus and minus by a contrast arithmetic operation unit () coincide entirely in each cylinder and the absolute value |&#x394;Ni'| of the difference in number of revolutions at the time of forced stop means is entirely above the absolute value |&#x394;Ni| of the difference in the number of revolutions at the time of temporary judgment means.

An exhaust gas purification device having a DPF provided in an exhaust system of an internal combustion engine. The device has one or more sound pressure measurement means for measuring exhaust sound pressure and calculation means for calculating the amount of PM accumulation based on the exhaust sound pressure measured. On the upstream side of the DPF are arranged exhaust gas temperature measurement means and exhaust gas temperature raising means. The exhaust gas temperature raising means is activated when the amount of PM accumulation calculated by the calculation means is higher than a preset default and at the same time when the exhaust gas temperature measured by the exhaust temperature measurement means is lower than a lower limit of a temperature region in which the DPF can be regenerated.

Exhaust gas purification device

In an embodiment of an exhaust gas purification apparatus, when an accumulation amount of particulate matter in a DPF () exceeds a predetermined amount and an exhaust gas temperature of an engine is lower than a restoration operable temperature, an intake air amount reducing operation is executed by an air intake throttling device () provided for an air intake pipe () of the engine, and a heating operation is executed by an electric heater () provided upstream from the DPF (), thereby increasing the exhaust gas temperature to the restoration operable temperature to start a restoration operation of the DPF ().

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Osaka, Japan

Shusuke Okada