WORKING VEHICLE

To prevent an EGR valve from being fastened after a stop of an engine.SOLUTION: In a working vehicle mounted with a diesel engine E having an EGR circuit 44 for reducing a part of an exhaust gas to an intake side, an EGR valve 43 for opening and closing the EGR circuit 44 is forcibly operated by the...

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Hauptverfasser: OKUBO YOSHINAO, OKAMOTO HIDEAKI, UEDA SUSUMU, EGUCHI HIROSHIGE, OKUBO SHINJI, KONNO AKIHIRO, ADACHI KENJI, HATTORI HIDENORI, FUKUYAMA NAOHIRO, OTA NAOYUKI, ARAKI TAKARA
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To prevent an EGR valve from being fastened after a stop of an engine.SOLUTION: In a working vehicle mounted with a diesel engine E having an EGR circuit 44 for reducing a part of an exhaust gas to an intake side, an EGR valve 43 for opening and closing the EGR circuit 44 is forcibly operated by the first prescribed number of times Z1 after a stop of an engine, and the first prescribed number of times Z1 is decided from a state of an exhaust gas at a prescribed time T1 before the stop of the engine. Also, a granulated substance PM amount in the exhaust gas at the prescribed time T1 before the stop of the engine is detected by an exhaust emission state detection sensor 78, and the first prescribed number of times Z1 is increased in association with an increase of the granulated substance amount at the prescribed time T1 before the stop of the engine.SELECTED DRAWING: Figure 6 【課題】エンジン停止後においてEGRバルブが固着するのを防止する。【解決手段】排気ガスの一部を吸気側へ還元するEGR回路44を有するディーゼルエンジンEを搭載した作業車両において、前記EGR回路44を開閉するEGRバルブ43をエンジン停止後に第1所定回数Z1強制作動させる構成とし、エンジン停止前の所定時間T1における排気ガスの状態から前記所定回数Z1を決定する構成としたことを特徴とする作業車両の構成とする。また、エンジン停止前の所定時間T1における排気ガス中の粒状化物質PM量を排気状態検出センサ78で検出し、エンジン停止前の所定時間Tにおける粒状化物質PM量の増加に関連して前記第1所定回数Z1を増やす構成としたことを特徴とする作業車両。【選択図】図6