EXHAUST GAS RECIRCULATION CONTROL DEVICE FOR ENGINE

PROBLEM TO BE SOLVED: To provide an exhaust gas recirculation control device for an engine, for controlling the recirculation amount of exhaust gas through an EGR passage 81 by means of the opening of an EGR valve 83 arranged in the EGR passage 81 and the opening of an exhaust shutter valve 43 arran...

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Hauptverfasser: TAKAHASHI KOTARO, SAHARA HIROYA, NAONO MASASHI, SUGA TOSHIYA
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide an exhaust gas recirculation control device for an engine, for controlling the recirculation amount of exhaust gas through an EGR passage 81 by means of the opening of an EGR valve 83 arranged in the EGR passage 81 and the opening of an exhaust shutter valve 43 arranged on the further downstream side than a connection part of an exhaust passage 40 to the EGR passage 81, while improving the responsiveness of a change of an actual recirculation amount with changes in the openings of the EGR valve 83 and the exhaust shutter valve 43, to a change of a target recirculation amount.SOLUTION: A valve control device executes: EGR valve opening control to determine the opening of the EGR valve 83, supposing that the exhaust shutter valve 43 is fully opened, and to control the opening of the EGR valve 83 as determined; and exhaust shutter valve opening control to determine the opening of the exhaust shutter valve 43, supposing that the EGR valve 83 is fully opened, and to control the opening of the exhaust shutter valve 43 as determined, independently of each other.SELECTED DRAWING: Figure 1 【課題】EGR通路81による排気ガスの還流量を、EGR通路81に配設されたEGR弁83の開度、及び、排気通路40におけるEGR通路81の接続部分よりも下流側に配設された排気シャッター弁43の開度により制御する場合に、目標還流量の変化に対する、EGR弁83及び排気シャッター弁43の開度変化に伴う実還流量の変化の応答性を向上させる。【解決手段】弁制御装置が、排気シャッター弁43が全開であるとしてEGR弁83の開度を決定して該EGR弁83を該決定した開度に制御するEGR弁開度制御と、EGR弁83が全開であるとして排気シャッター弁43の開度を決定して該排気シャッター弁43を該決定した開度に制御する排気シャッター弁開度制御とを互いに独立して実行する。【選択図】図1