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Air/fuel ratio control device for internal combustion engine

A control device and air-fuel ratio technology, applied in engine control, fuel injection control, electrical control, etc., can solve problems such as increasing fuel injection volume

Inactive Publication Date: 2012-09-12
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the above, when the engine operating state is in a state where the engine speed is high, or when the engine operating state is in a state where the engine load is large, it is difficult to immediately perform an increase in the fuel injection amount.

Method used

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  • Air/fuel ratio control device for internal combustion engine
  • Air/fuel ratio control device for internal combustion engine
  • Air/fuel ratio control device for internal combustion engine

Examples

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Embodiment Construction

[0042] Hereinafter, embodiments of the air-fuel ratio control device of the present invention will be described with reference to the drawings. exist figure 1 Among them, 10 represents the internal combustion engine. The internal combustion engine 10 includes: a cylinder block portion 20 comprising a cylinder block, a cylinder block lower shell, an oil pan, etc., a cylinder head portion 30 fixed on the cylinder block portion 20 for supplying the cylinder block portion 20 with fuel and air The intake passage 40 for the air-fuel mixture constituted, and the exhaust passage 50 for discharging the exhaust gas from the cylinder block 20 to the outside.

[0043] The cylinder block 20 has a cylinder 21 , a piston 22 , a connecting rod 23 , and a crankshaft 24 . The piston 22 reciprocates within the cylinder 21 , and the reciprocating motion of the piston 22 is transmitted to the crankshaft 24 via the connecting rod 23 , whereby the crankshaft 24 is rotated. In addition, the combus...

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PUM

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Abstract

An oxidizing catalyst (52) is provided in an exhaust passage. After performing rich control, which controls so that the air / fuel ratio of an air / fuel mixture formed in a combustion chamber (25) is richer than the stoichiometric air / fuel ratio, lean control is performed, whereby the air / fuel ratio of the air / fuel mixture formed in the combustion chamber is either controlled so as to be leaner than the stoichiometric air / fuel ratio by a preset degree or temporarily controlled so as to be leaner than the stoichiometric air / fuel ratio by a preset degree. When lean control is performed after the completion of rich control, provisional lean control is performed, whereby the air / fuel ratio of the air / fuel mixture formed in the combustion chamber is controlled so that, when the air / fuel ratio is controlled lean of the stoichiometric air / fuel ratio in lean control, the degree by which the air / fuel ratio of the air / fuel mixture formed in the combustion chamber is leaner than stoichiometric air / fuel ratio becomes less than the degree preset in accordance with the catalyst temperature.

Description

technical field [0001] The invention relates to a control device for an internal combustion engine. Background technique [0002] Japanese Patent Application Laid-Open No. Sho 63-45444 discloses an air-fuel ratio control device for a spark ignition type internal combustion engine having a three-way catalyst in an exhaust passage. In this air-fuel ratio control device, when the temperature of the three-way catalyst is higher than the target temperature, the amount of fuel injected from the fuel injection valve is larger than the usual amount, that is, the fuel is discharged from the combustion chamber as the fuel injection amount increases. The temperature of the exhaust gas is lowered, thereby preventing the temperature of the three-way catalyst from becoming excessively high beyond a predetermined temperature. [0003] However, in the above publication, since the rotational speed of the internal combustion engine (hereinafter, the rotational speed of the internal combustio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/04F01N3/24F02D45/00
CPCF02D41/0235F02D41/024F02D41/025F02D41/1475F02D2041/0265F02D2200/0802
Inventor 吉冈卫
Owner TOYOTA JIDOSHA KK
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