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US 8,944,037 B2Granted
Exhaust gas purifying apparatus for internal combustion engine
AssigneeDenso Corporation
InventorsYutaka Yonekawa, Tomoaki Nakano
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AssigneeDenso Corporation
InventorsYutaka Yonekawa, Tomoaki Nakano
Estimating the term…
An exhaust gas purifying apparatus for an internal combustion engine includes a lean control unit and a rich control unit. The lean control unit executes lean spike operation, in which an air-fuel ratio is temporarily changed in a lean direction by a lean change width relative to a reference air-fuel ratio. The rich control unit changes the air-fuel ratio in a rich direction by a rich change width relative to the reference air-fuel ratio after the lean control unit executes the lean spike operation such that the air-fuel ratio stays in a predetermined slightly rich region. The rich change width is smaller than the lean change width.
An exhaust gas purifying apparatus for an internal combustion engine, wherein an exhaust passage of the internal combustion engine is provided with a catalytic converter that includes an oxygen storage medium and a precious metal, wherein the oxygen storage medium stores and releases oxygen in exhaust gas, wherein the precious metal serves as a catalyst composition, the exhaust gas purifying apparatus comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Characterised by the position of the sensor: plural sensors
In relation with the state of the exhaust gas treating apparatus: control according to the amount of oxygen that is stored on the exhaust gas…
Characterised by the regulation method: regulating the air fuel ratio at a value other than stoichiometry
By using absorbents or adsorbents: using means for controlling, e.g. purging, the absorbents or adsorbents
About 6 years 2 months of term left · ends 18 Dec 2032 (estimated)
This application is based on and incorporates herein by reference Japanese Patent Application No. 2009-86480 filed on Mar. 31, 2009.
1. Field of the Invention
The present invention relates to an exhaust gas purifying apparatus for an internal combustion engine.
The invention, together with additional objectives, features and advantages thereof, will be best understood from the following description, the appended claims and the accompanying drawings in which:
FIG. 1 is a diagram illustrating an entire schematic structure of an engine control system of the first embodiment of the present invention;
FIG. 2 is a characteristic diagram of electromotive force of an O2 sensor;
(First Embodiment)
The first embodiment of the present invention will be described below with reference to the accompanying drawings. The present embodiment constitutes an engine control system for a gasoline engine for a vehicle. The control system mainly has an electronic control unit (hereinafter, referred as ECU) that controls a fuel injection quantity and controls ignition timing. FIG. 1 is a diagram illustrating an entire schematic structure of the engine control system.
In FIG. 1, an engine 10 is provided with an intake pipe 11 (intake passage), and an air cleaner 12 is provided at an upstream end of the intake pipe 11. A throttle valve 14 is provided downstream of the air cleaner 12, and an opening of the throttle valve 14 is adjusted by a throttle actuator 13, such as a DC motor. The opening of the throttle valve 14 (throttle opening) is detected by a throttle opening sensor included in the throttle actuator 13. Also, an intake pipe pressure sensor 15 is provided downstream of the throttle valve 14 for detecting pressure in the intake pipe. A fuel injection valve 16 is provided downstream of the intake pipe pressure sensor 15 in a vicinity of the intake port. The fuel injection valve 16 is electromagnetically actuated to inject fuel.