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Control device and method for internal combustion engine

A technology of a control device and an internal combustion engine, applied in engine control, fuel injection control, internal combustion piston engine, etc., can solve problems such as longer time

Active Publication Date: 2020-08-07
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the learning control is started in the above-mentioned situation where the deviation from the steady state is relatively large, the time required until the update of the learning value is completed becomes longer.

Method used

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  • Control device and method for internal combustion engine
  • Control device and method for internal combustion engine
  • Control device and method for internal combustion engine

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Embodiment Construction

[0019] Below, according to Figure 1 to Figure 8 One embodiment of a control device for an internal combustion engine will be described.

[0020] exist figure 1 The middle figure shows the control device 30 of this embodiment and the internal combustion engine 10 controlled by the control device 30 . The internal combustion engine 10 includes a plurality of cylinders 11 . exist figure 1 Among them, only one cylinder 11 is shown in the figure. A reciprocating piston 12 is provided in each cylinder 11 . The space above the piston 12 in each cylinder 11 serves as a combustion chamber 13 .

[0021] An intake passage 14 of the internal combustion engine 10 is provided with a throttle valve 15 that adjusts the amount of intake air flowing in the intake passage 14 . When intake valve 16 is open, intake air is introduced into combustion chamber 13 via intake passage 14 .

[0022] The internal combustion engine 10 is provided with a fuel injection valve 17 that injects fuel. ex...

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PUM

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Abstract

The present invention provides a control device and method for an internal combustion engine, the control device comprises: a fuel amount control part that adjusts the amount of fuel supplied into a cylinder by feedback control using an air-fuel ratio deviation as an input; a target air-fuel ratio adjustment part that alternately repeats lean-period processing and rich-period processing; and a learning value updating part that updates a learning value that compensates for the steady-state deviation of the air-fuel ratio. When the absolute value of the oxygen amount deviation is equal to or less than a determination value, the learning value update unit updates the learning value (X) only when switching from one of the lean-period process and the rich-period process to the other process. Onthe other hand, when the absolute value of the oxygen amount deviation is greater than the determination value, the learning value update part updates the learning value (X) both when switching fromone process to the other process and when switching from the other process to the one process.

Description

technical field [0001] The invention relates to a control device and method for an internal combustion engine. Background technique [0002] JP-A-2015-71963 describes an example of a control device for an internal combustion engine that adjusts a fuel injection amount of a fuel injection valve so that a detected air-fuel ratio becomes a target air-fuel ratio. The air-fuel ratio detection value is a sensor value detected by an upstream side air-fuel ratio sensor arranged on the upstream side of the catalyst in the exhaust passage. A steady-state deviation sometimes occurs between the air-fuel ratio detected value and the actual air-fuel ratio. The actual air-fuel ratio is the actual air-fuel ratio. Therefore, in the control device described in Japanese Patent Application Laid-Open No. 2015-71963, compensation control for compensating for a deviation between the air-fuel ratio detection value and the steady state of the actual air-fuel ratio and learning for updating a learn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14F02D45/00F01N3/24
CPCF02D41/1401F02D45/00F01N3/24F02D41/1475F02D41/1454F02D41/0295F02D41/2461F02D2200/0814F01N3/10F01N3/101Y02A50/20F02D41/30
Inventor 井下宪二中川德久
Owner TOYOTA JIDOSHA KK