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US 6,279,537 B1Granted
Air fuel ratio control apparatus for an internal combustion engine
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsTosiaki Yonekura, Hideaki Katashiba, Satoshi Wachi, Hirofumi Ohuchi
Life of this patent
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Abstract
In order to improve estimation accuracy of estimating the value of the NOx exhaust concentration, the air fuel ratio control apparatus is adapted to estimate the NOx exhaust concentration from at least either one of a value depending on the air fuel ratio or a value depending on the exhaust gas recirculation quantity and a value depending to the ignition timing by means of the ECU 230.
Claims12
An air fuel ratio control apparatus for an internal combustion engine comprising:
- a NOx catalyst disposed in a exhaust gas passage of internal combustion engine,
- a NOx exhaust quantity estimation means for estimating quantity of NOx exhausted from said internal combustion engine,
- an air fuel ratio control means for controlling said air fuel ratio based on said estimated NOx exhaust quantity estimated by said NOx exhaust quantity estimation means, and
- a NOx exhaust concentration estimation means for estimating said concentration of said exhausted NOx from a value depending on an ignition timing and at least either one of a value depending on the air fuel ratio and a value depending on an exhaust gas recirculation quantity.
1 more element
Dependencies are inferred from the claim text.