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Control apparatus for internal combustion engine

A technology for controlling equipment and internal combustion engines, which is applied in the direction of mechanical equipment, engine control, fuel injection control, etc., and can solve problems such as the increase in the degree of change and the increase in the amount of exhaust emissions

Active Publication Date: 2018-08-10
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If a malfunction occurs in, for example, a fuel injection valve for any one of the cylinders, the degree of variation between the air-fuel ratios in the cylinders may increase, resulting in an increase in the amount of exhaust emissions

Method used

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  • Control apparatus for internal combustion engine
  • Control apparatus for internal combustion engine
  • Control apparatus for internal combustion engine

Examples

Experimental program
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Effect test

Embodiment Construction

[0022] figure 1 is a schematic configuration diagram of the engine system 1 . as in figure 1 As shown schematically in , the engine system 1 includes a three-way catalyst 31 configured to purify exhaust gas exhausted from the engine 20 , and the like. The engine 20 is constructed such that an air-fuel mixture is combusted in a combustion chamber 23 in a cylinder head 22 placed on a cylinder block 21 to cause a piston 24 to reciprocate. In the present embodiment, the engine 20 is an inline four-cylinder engine. However, the engine 20 is not limited to an inline four-cylinder engine as long as the engine 20 includes a plurality of cylinders.

[0023] Each cylinder is provided with an intake valve Vi and an exhaust valve Ve placed in a cylinder head 22 of the engine 20 . The intake valve Vi is configured to open and close an intake port, and the exhaust valve Ve is configured to open and close an exhaust port. Furthermore, each cylinder is provided with an ignition plug 27 c...

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PUM

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Abstract

The invention relates to a control apparatus for an internal combustion engine. A control apparatus for an internal combustion engine executes a detection process upon satisfaction of all detection preconditions including a stopped condition that a temperature-increasing process has been stopped; determines whether all the detection preconditions except the stopped condition are satisfied, duringthe temperature-increasing process; executes a gradually-changing-and-stopping process of stopping the temperature-increasing process by gradually changing the air-fuel ratios in the cylinders to a target air-fuel ratio set based on an operation state of the internal combustion engine after stop of the temperature-increasing process, when a negative determination is made and a temperature-increasing process stop request has been issued; and executes a promptly-stopping process of stopping the temperature-increasing process by changing the air-fuel ratios in the cylinders to the target air-fuelratio within a shorter time period than that of the gradually-changing-and-stopping process, when an affirmative determination is made and a temperature-increasing process stop request has been issued.

Description

technical field [0001] The invention relates to a control device for an internal combustion engine. Background technique [0002] A temperature raising process of raising the temperature of the catalyst to an appropriate temperature is performed in some cases in order to suppress an increase in the amount of exhaust emissions from the internal combustion engine. Examples of temperature raising processing include control of adjusting the air-fuel ratio in at least one of a plurality of cylinders of the internal combustion engine to a rich air-fuel ratio and adjusting the target air-fuel ratio for the remaining cylinders to a lean air-fuel ratio (for example, see Japanese Unexamined Patent Application Publication No.2012-057492). [0003] If a malfunction occurs in, for example, a fuel injection valve for any one of the cylinders, the degree of variation between air-fuel ratios among the cylinders may increase, resulting in an increase in the amount of exhaust emissions. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14
CPCF02D41/1454F02D41/008F02D41/025F02D41/1456F02D41/1495Y02T10/12F01N9/00F01N2900/1602F01N2900/1404F01N2900/08F02D41/0245F02D41/0255F02D41/1446
Inventor 寉冈一辉
Owner TOYOTA JIDOSHA KK
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