Apparatus for controlling the idling speed of engine operable on gasoline/alcohol fuel blend

An apparatus for use with an internal combustion engine operable on either of gasoline fuel, alcohol fuel and gasoline/alcohol fuel blend. The apparatus comprises an alcohol concentration sensor for producing a signal indicative of an alcohol concentration of the fuel to be delivered to the engine,...

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Bibliographische Detailangaben
Hauptverfasser:	OOTA, TADAKI
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:	An apparatus for use with an internal combustion engine operable on either of gasoline fuel, alcohol fuel and gasoline/alcohol fuel blend. The apparatus comprises an alcohol concentration sensor for producing a signal indicative of an alcohol concentration of the fuel to be delivered to the engine, an oxygen sensor for producing a signal indicative of an oxygen content of exhaust gases discharged from the engine, and an engine coolant temperature sensor for producing a signal indicative of an engine coolant temperature. A control unit is coupled to the alcohol-concentration, oxygen and engine-coolant-temperature sensors. The control unit is responsive to the air/fuel ratio feedback signal for correcting the fuel supplied to the engine to maintain a desired air/fuel ratio when the sensed engine coolant temperature exceeds a predetermined value. The control unit is also responsive to an idle engine condition for calculating a target value for engine idling speed as a function of alcohol concentration and engine coolant temperature when the coolant temperature is below the predetermined value. An engine speed control device is coupled to the control unit for adjusting the engine speed at the calculated target value.