ENGINE SYSTEM

To suppress deterioration of fuel economy caused by driving of a vacuum pump.SOLUTION: An engine system includes an exhaust pipe 54 through which exhaust gas flows, an EGR valve 24 which is operated with the usage of negative pressure, a vacuum pump 6 which supplies negative pressure to the EGR valv...

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Bibliographische Detailangaben
1. Verfasser:	IWAHASHI TAKUO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BLASTING COMBUSTION ENGINES COMBUSTION ENGINES IN GENERAL HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS INTERNAL-COMBUSTION PISTON ENGINES LIGHTING MECHANICAL ENGINEERING SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF WEAPONS
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Beschreibung
Zusammenfassung:	To suppress deterioration of fuel economy caused by driving of a vacuum pump.SOLUTION: An engine system includes an exhaust pipe 54 through which exhaust gas flows, an EGR valve 24 which is operated with the usage of negative pressure, a vacuum pump 6 which supplies negative pressure to the EGR valve 24 with using an engine body as a driving source, piping 76 which connects an intake port 6a of the vacuum pump 6 and the EGR valve 24, piping 78 which connects the exhaust pipe 54 and the intake port 6a of the vacuum pump 6, and an on-off valve 80 which is provided in the piping 78 and can be switched between a communication state where the exhaust pipe 54 and the vacuum pump 6 are communicated with each other and a shutoff state where the exhaust pipe 54 and the vacuum pump 6 are shut off from each other.SELECTED DRAWING: Figure 3 【課題】バキュームポンプの駆動による燃費の悪化を抑制する。【解決手段】エンジンシステムは、排気が流通する排気管５４と、負圧を用いて作動するＥＧＲバルブ２４と、エンジン本体を駆動源としてＥＧＲバルブ２４に負圧を供給するバキュームポンプ６と、バキュームポンプ６の吸気口６ａとＥＧＲバルブ２４とを接続する配管７６と、排気管５４とバキュームポンプ６の吸気口６ａとを接続する配管７８と、配管７８に設けられ、排気管５４とバキュームポンプ６とを連通する連通状態と排気管５４とバキュームポンプ６とを遮断する遮断状態との間で切り替え可能な開閉弁８０とを備える。【選択図】図３