AIR-FUEL RATIO CONTROL DEVICE

PURPOSE:To improve the consumption of fuel by changing the delay time for a lean or rich judgment so that the air-fuel ratio comes to the rich side when the temperature of catalytic converter rhodium exceeds a set value, so as to achieve the attainment of leanness within the range not to overheat th...

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Bibliographic Details
Main Author IWAKURA YOICHI
Format Patent
LanguageEnglish
Published 19.02.1988
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
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Summary:PURPOSE:To improve the consumption of fuel by changing the delay time for a lean or rich judgment so that the air-fuel ratio comes to the rich side when the temperature of catalytic converter rhodium exceeds a set value, so as to achieve the attainment of leanness within the range not to overheat the catalytic converter rhodium. CONSTITUTION:An air-fuel ratio judging means 18 judges whether the air-fuel ratio of mixture a given delay time is lean or rich, on the basis of the signal from an O2 sensor 1 which detects the oxygen content in exhaust gases. An air-fuel ratio adjusting mechanism 4 controls the air flow rate to an air bleed passage 6 via a flow control valve 8 on the basis of the signal from the air-fuel ratio judging means 18. A catalyst temperature judging means 21 judges whether the temperature of catalytic converter rhodium 3a has exceeded a set value of not, on the basis of the detected value of a catalyst temperature sensor 26. An air-fuel ratio control correcting means 19 changes the delay time so that the air-fuel ratio comes to the rich side when the temperature of catalytic converter rhodium 3a exceeds a set value.
Bibliography:Application Number: JP19860183052