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Control device for internal combustion engine

A control device and internal combustion engine technology, applied in engine control, fuel injection control, electrical control, etc., can solve problems such as air-fuel ratio sensor output deviation, and achieve the effect of suppressing the decline in detection accuracy

Active Publication Date: 2022-07-29
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the output of the air-fuel ratio sensor may deviate due to deterioration over time, individual variation, etc.

Method used

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  • Control device for internal combustion engine
  • Control device for internal combustion engine
  • Control device for internal combustion engine

Examples

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Embodiment Construction

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in the following description, the same code|symbol is attached|subjected to the same component.

[0041]

[0042] First refer to Figure 1 to Figure 13 , the first embodiment of the present invention will be described.

[0043]

[0044] figure 1 This is a diagram schematically showing an internal combustion engine provided with the control device for the internal combustion engine according to the first embodiment of the present invention. figure 1 The internal combustion engine shown is a spark ignition type internal combustion engine. The internal combustion engine is mounted on the vehicle.

[0045] refer to figure 1 , 2 represents the cylinder block, 3 represents the piston reciprocating in the cylinder block 2, 4 represents the cylinder head fixed on the cylinder block 2, 5 represents the combustion chamber formed between ...

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Abstract

Provided is a control device for an internal combustion engine capable of suppressing a decrease in the detection accuracy of the air-fuel ratio by an air-fuel ratio sensor disposed in an exhaust passage of the internal combustion engine. A control device for an internal combustion engine includes: an air-fuel ratio sensor (40, 41) that is disposed in an exhaust passage of the internal combustion engine and detects the air-fuel ratio of the exhaust gas; a current detecting device (61) that detects an output current of the air-fuel ratio sensor; and a voltage applying device (60) ) to apply a voltage to the air-fuel ratio sensor; and a voltage control unit (81) to control the applied voltage to the air-fuel ratio sensor via a voltage application device. The voltage control unit sets the applied voltage to a reference voltage determined so that the output current becomes zero when the air-fuel ratio of the inflow exhaust gas flowing into the air-fuel ratio sensor is the stoichiometric air-fuel ratio, so that the air-fuel ratio of the inflow exhaust gas is determined to be the air-fuel ratio of the inflow exhaust gas. The reference voltage is corrected so that the output current detected by the current detection device at the stoichiometric air-fuel ratio becomes zero.

Description

technical field [0001] The present invention relates to a control device for an internal combustion engine. Background technique [0002] Conventionally, it is known to arrange a catalyst and an air-fuel ratio sensor in an exhaust passage of an internal combustion engine. By controlling the air-fuel ratio of the air-fuel mixture based on the output of the air-fuel ratio sensor, the exhaust gas is effectively purified in the catalyst, and the exhaust gas emission is improved. [0003] However, the output of the air-fuel ratio sensor may vary due to deterioration over time, individual variation, or the like. Therefore, in the control device of the internal combustion engine described in Patent Document 1, the output of the downstream side air-fuel ratio sensor arranged on the downstream side of the catalyst is corrected. Specifically, the output air-fuel ratio of the downstream air-fuel ratio sensor and the stoichiometric air-fuel ratio detected at the timing when the air-fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/04F02D41/12F02D41/14F02D41/20F02D41/02
CPCF02D41/04F02D41/123F02D41/1454F02D41/1475F02D41/1484F02D41/20F02D41/0295F02D41/1408F02D2041/2051F02D2041/2058F02D41/2438F02D41/2474F01N11/007F02D41/1439F02D41/1473F02D41/1496
Inventor 青木圭一郎
Owner TOYOTA JIDOSHA KK
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