Control devices for internal combustion engines

A technology for control devices and internal combustion engines, applied in engine control, fuel injection control, electrical control, etc., can solve problems such as excess oxygen adsorption

Inactive Publication Date: 2011-12-14
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, when the fuel cut is performed, the EGR catalyst also excessively absorbs oxygen

Method used

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  • Control devices for internal combustion engines
  • Control devices for internal combustion engines
  • Control devices for internal combustion engines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0025] Embodiment 1 A diagram illustrating a system configuration according to Embodiment 1 of the present invention. Such as figure 1 As shown, the system of this embodiment includes an internal combustion engine (hereinafter simply referred to as an engine) 10 mounted on a vehicle or the like. The engine 10 of the present embodiment is an inline four-cylinder engine including four cylinders #1 to #4. The burning sequence is #1→#3→#4→#2. Although not shown, each cylinder is provided with a piston, an intake valve, an exhaust valve, a spark plug, and a fuel nozzle 42 .

[0026] A throttle valve 14 is provided in an intake passage 12 that supplies intake air to the engine 10 . The intake passage 12 is connected to the engine 10 via an intake manifold 16 . The suction header 16 has a surge tank 18 and four suction branch pipes 20 protruding from the surge tank 18 . Each air intake branch pipe 20 is connected to the air intake port of each cylinder respectively.

[0027] An...

Embodiment approach 2

[0063] Next, refer to image 3 Embodiment 2 of the present invention will be described, but only the points of difference from Embodiment 1 described above will be described, and descriptions of the same items will be simplified or omitted.

[0064] In the enrichment control in Embodiment 1 described above, the control is such that the adjustment of the oxygen storage amounts of both the exhaust purification catalyst 34 and the EGR catalyst 38 is completed simultaneously. On the other hand, in the present embodiment, the adjustment of the oxygen storage amount of the EGR catalyst 38 is controlled to be completed before the adjustment of the oxygen storage amount of the exhaust purification catalyst 34 is completed.

[0065] image 3 It is a time chart showing changes in the air-fuel ratios of the #1 cylinder and #4 cylinder and changes in the air-fuel ratios of the #2 cylinder and #3 cylinder after recovery from the fuel cut in the present embodiment. exist image 3 In the ...

Embodiment approach 3

[0075] Next, refer to Figure 4 Embodiment 3 of the present invention will be described, but only differences from the above-mentioned Embodiments 1 and 2 will be described, and descriptions of the same matters will be simplified or omitted.

[0076]In Embodiments 1 and 2 described above, the description has been made in which EGR is executed immediately after returning from the fuel cut. However, EGR may not be executed immediately after returning from the fuel cut, but may be started in the middle of execution of the enrichment control. For example, although the engine is in the EGR prohibition operation region shortly after recovery from the fuel cut, the required engine load increases, and the vehicle may shift to the EGR allowment operation region.

[0077] In the present embodiment, when EGR is started in the middle of the enrichment control, the adjustment of the oxygen storage amount of the EGR catalyst 38 is controlled to be completed before the adjustment of the oxy...

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PUM

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Abstract

Disclosed is an internal combustion engine controller which is adapted such that the amount of oxygen occluded in a catalyst in an exhaust gas path and the amount of oxygen occluded in a catalyst in an exhaust gas recirculation path are appropriately adjusted in a quick manner after recovery from fuel cut. The controller controls an internal combustion engine which includes a recirculation gas forming cylinder and a recirculation gas non-forming cylinder. The controller includes the exhaust gas recirculation path for coupling between the exhaust gas path, through which only the exhaust gas from the recirculation gas forming cylinder flows, and an intake air line. The controller also includes a recirculation catalyst which is disposed at some midpoint in the exhaust gas recirculation path, and a rich control means for providing rich control to temporarily set an air-fuel ratio richer than a theoretical one when fuel injection is restarted after recovery from fuel cut. The rich control means includes an air-fuel ratio control means which makes the air-fuel ratio in the recirculation gas forming cylinder richer than the air-fuel ratio in the recirculation gas non-forming cylinder when the rich control and the recirculation of exhaust gas through the exhaust gas recirculation path are simultaneously executed.

Description

technical field [0001] The invention relates to a control device for an internal combustion engine. Background technique [0002] An internal combustion engine that has an EGR passage that connects an exhaust passage and an intake passage of the internal combustion engine, and that can perform exhaust gas recirculation (EGR) through which a part of the exhaust gas flows back into the intake passage is widely used. (For example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open No. 2003-3879 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2007-9779 [0005] When performing EGR, deposits are likely to accumulate in the EGR passage, EGR cooler, suction port, suction valve, etc. One of the reasons for the accumulation of deposits is that unburned HC, NO X , PM, etc. Therefore, in order to suppress the accumulation of the above-mentioned deposits, it has been proposed to install a catalyst (EGR catalyst) for purifying exhaust gas on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14F02D41/18
CPCF02D41/126F02M25/07F02D41/0295F01N2430/06F01N2900/1624F02D41/0065F02D41/0082F01N13/107F02M26/35F02M26/43
Inventor 宫下茂树
Owner TOYOTA JIDOSHA KK
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