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Controller for internal combustion engine

A technology of a control device and an internal combustion engine, which is applied in the directions of engine control, internal combustion piston engine, electrical control, etc., can solve problems such as the inability to restore catalyst purification performance as soon as possible.

Active Publication Date: 2021-05-14
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to gradually release oxygen from the catalyst, and there is a possibility that the purification performance of the catalyst cannot be restored as soon as possible.

Method used

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  • Controller for internal combustion engine
  • Controller for internal combustion engine
  • Controller for internal combustion engine

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Experimental program
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no. 1 Embodiment approach

[0017] Below, refer to Figure 1 ~ Figure 3 , and a description will be given of a first embodiment in which a control device for an internal combustion engine is embodied.

[0018] Such as figure 1 As shown, an intake passage 11 is connected to an internal combustion engine 10 . In this intake passage 11, a throttle valve 15 for changing the passage area is provided. The amount of air sucked through the air cleaner 14 is adjusted by controlling the opening of the throttle valve 15 . In addition, the air flow meter 16 detects the intake air amount GA which is the amount of air sucked in. Air drawn into the intake passage 11 is mixed with fuel injected from an injector 17 provided downstream of the throttle valve 15 , and then sent to a combustion chamber of the internal combustion engine 10 to be combusted.

[0019] In the exhaust passage 13 into which exhaust gas generated by combustion in the combustion chamber is sent, an exhaust gas purification catalyst 18 for purifyi...

no. 2 Embodiment approach

[0053] Next, refer to Figure 4 , and a second embodiment in which a control device for an internal combustion engine is realized will be described.

[0054] In the first embodiment, the update process of the excess ratio storage value λm is performed, but such an update process is omitted in the present embodiment. Hereinafter, this embodiment will be described focusing on such differences.

[0055] Figure 4 It shows the processing procedure executed by the control device 100 to set the above-mentioned target equivalence ratio φt. Note that the processing shown in the figure is realized by CPU 110 executing a program stored in memory 120 of control device 100 , and control device 100 executes this processing in response to the start of rich control. In addition, hereinafter, the step numbers are represented by numerals assigned "S" at the beginning.

[0056] When this process is started, the control device 100 acquires the rear air excess ratio λr (S200). The rear exces...

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Abstract

A controller for an internal combustion engine is configured to execute a rich air-fuel ratio control for performing fuel injection while setting a target equivalence ratio such that, at recovery from a fuel cutoff process, an air-fuel ratio of air-fuel mixture is richer than a stoichiometric air-fuel ratio. The controller is configured to execute a target equivalence ratio setting process for setting the target equivalence ratio that is maintained during execution of the rich air-fuel ratio control such that the target equivalence ratio increases as an air excess ratio that is calculated from an output value of a second air-fuel ratio sensor at start of the rich air-fuel ratio control increases.

Description

technical field [0001] The present disclosure relates to a control device for an internal combustion engine. Background technique [0002] When the fuel cut is executed in the internal combustion engine, the oxygen storage amount of the catalyst provided in the exhaust passage increases. When such an oxygen storage amount exceeds an appropriate value and becomes too large, it becomes difficult to progress reduction of NOx in the catalyst when the combustion of the air-fuel mixture starts after the fuel-cut recovery. [0003] For example, the control device described in Japanese Patent Application Laid-Open No. 2005-201112 performs rich control when the oxygen storage amount of the catalyst exceeds a predetermined value during fuel cut execution. The rich control refers to control of fuel injection so that the air-fuel ratio of the air-fuel mixture is richer than the stoichiometric air-fuel ratio at the time of recovery from the fuel cut. [0004] When this rich control is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N11/00F02D45/00
CPCF01N3/20F01N11/007F02D45/00F01N3/10F01N2560/025F01N2560/14F01N2430/06F01N2900/1624F01N9/00F02D41/126F02D41/1475F02D41/1454F02D2200/0814F02D41/1441F02D41/30F01N3/28
Inventor 水谷贵光城佑辅井户侧正直元古武志
Owner TOYOTA JIDOSHA KK
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