Engine control with exhaust gas recirculation

In engine control apparatus with exhaust gas recirculation control and air/fuel ratio feedback control, the amount of recirculated exhausted gasses is accurately detected so as to operate an internal combustion engine under an optimal operating condition all the time. To this end a correction factor...

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Bibliographische Detailangaben
Hauptverfasser:	YAMAZOE, HISAMITSU, KODAMA, KATSUHIKO
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION COMBUSTION ENGINES CONTROLLING COMBUSTION ENGINES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MECHANICAL ENGINEERING TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE WEAPONS
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Beschreibung
Zusammenfassung:	In engine control apparatus with exhaust gas recirculation control and air/fuel ratio feedback control, the amount of recirculated exhausted gasses is accurately detected so as to operate an internal combustion engine under an optimal operating condition all the time. To this end a correction factor derived from oxygen sensor output, which is used for air/fuel ratio control, is monitored to obtain a difference of a correction factor value resulted from engine operation with EGR and another correction factor value resulted from engine operation with EGR. This difference is obtained by forcibly interrupting EGR operation. Once the amount of recirculated exhaust is accurately estimated, the EGR control and/or air/fuel ratio control are performed with compensation for possible error due to secular change in EGR system.