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Air-fuel ratio control apparatus and air-fuel ratio control method for internal combustion engine

A technology for internal combustion engines and control equipment, applied in engine control, mechanical equipment, machines/engines, etc., can solve problems such as air-fuel ratio becoming rich

Inactive Publication Date: 2010-07-28
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, for the first time when the ammonia sensor outputs a value larger than the standard value in a lean atmosphere, the above system judges that the air-fuel ratio deviates to the lean side, and makes the air-fuel ratio rich

Method used

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  • Air-fuel ratio control apparatus and air-fuel ratio control method for internal combustion engine
  • Air-fuel ratio control apparatus and air-fuel ratio control method for internal combustion engine
  • Air-fuel ratio control apparatus and air-fuel ratio control method for internal combustion engine

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no. 1 approach

[0048] [Configuration of First Embodiment]

[0049] figure 1 It is a figure for explaining the structure of 1st Embodiment of this invention. Such as figure 1 As shown, the system according to this embodiment of the invention is equipped with an internal combustion engine 10 . The exhaust passage 12 communicates with the internal combustion engine 10 . A three-way catalyst 14 is contained in the exhaust passage 12 . An air-fuel ratio sensor 16 for detecting the air-fuel ratio of exhaust gas is provided upstream of the three-way catalyst 14 . Furthermore, an ammonia sensor 18 is provided downstream of the three-way catalyst 14 .

[0050] The output of the air-fuel ratio sensor 12 and the output of the ammonia sensor 18 are supplied to an electronic control unit (ECU) 30 . Further, the output of the air flow meter 32 for detecting the intake air amount Ga and the output of the rotational speed sensor 34 for detecting the engine rotational speed Ne are supplied to the ECU 3...

no. 2 approach

[0082] [Features of the second embodiment]

[0083] Next, we will refer to Figure 5 to Figure 7 A second embodiment of the present invention is described. The system according to this embodiment of the present invention can be performed by causing the ECU 30 to execute the Figure 5 shown in the program described later rather than Figure 4 shown in the program to achieve.

[0084] In the system according to the above-mentioned first embodiment of the present invention, the emission performance is improved by shifting the AF target value of the sub-feedback control to the rich side, focusing on the fact that the purification rates of HC, CO, and NOx by the three-way catalyst 14 tend to be different fact of decline. The purification capability of the three-way catalyst 14 is not always constant, but varies according to the load state of the internal combustion engine 10 . In addition, the amounts of HC, CO and NOx emitted from the internal combustion engine 10 also vary a...

no. 3 approach

[0102] [Features of the third embodiment]

[0103] Next, we will refer to Figure 8 A third embodiment of the present invention is described. The system according to this embodiment of the present invention can be performed by causing the ECU 30 to execute the Figure 8 shown in the program described later rather than Figure 4 or Figure 5 shown in the program to achieve.

[0104] In the above-mentioned first embodiment of the present invention and the above-mentioned second embodiment of the present invention, the output of the ammonia sensor 18 and the target value are compared with each other in magnitude, and the sub-feedback update amount DSFBG is set to - 0.01 or 0.01. That is, in the first embodiment of the present invention and the second embodiment of the present invention, regardless of the amount by which the ammonia sensor 18 deviates from the target value, the sub-feedback learning value SFBG is always increased / decreased by a certain amount.

[0105] Howev...

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Abstract

An amount of fuel injected into an internal combustion engine 10 is controlled to adjust an air-fuel ratio. An air-fuel ratio sensor 16 is disposed upstream of a three-way catalyst 14. An ammonia sensor 18 is disposed downstream of the three-way catalyst 14. Main feedback control based on the air-fuel ratio sensor 16 is performed such that the air-fuel ratio of exhaust gas becomes close to a target air-fuel ratio in the neighborhood of a stoichiometric air-fuel ratio. Sub-feedback control is performed on the basis of an output value of the ammonia sensor 18.

Description

technical field [0001] The present invention relates to an air-fuel ratio control apparatus for an internal combustion engine, and more particularly, to an air-fuel ratio control apparatus and an air-fuel ratio control method for an internal combustion engine that perform air-fuel ratio feedback control based on an exhaust state. Background technique [0002] As disclosed in Japanese Patent Application Publication No. 2002-276419 (JP-A-2002-276419), there is known a system in which an ammonia sensor is provided in an exhaust passage of an internal combustion engine. In this system, the ammonia sensor is placed after the catalyst, and the catalyst is placed in the exhaust passage. In addition, an oxygen sensor is provided at a rear stage of the catalyst together with an ammonia sensor. [0003] Nitrogen oxides (NOx) may be contained in the exhaust gas of an internal combustion engine when the air-fuel ratio of the exhaust gas is lean. Therefore, when the air-fuel ratio of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14
CPCF02D41/146F02D2041/1468F02D2041/1419F02D41/1454F02D41/1441
Inventor 宫下茂树增田桂
Owner TOYOTA JIDOSHA KK