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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, internal combustion piston engine, etc., can solve problems such as fuel unevenness, fuel economy, exhaust emission deterioration, etc.

Inactive Publication Date: 2014-06-11
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method described in Patent Document 1, in a state where a plurality of (for example, two) fuel injection valves of each cylinder are simultaneously driven, it is impossible to detect the fuel flow rate by each intake port for each cycle and for each intake port. The amount of fuel flowing into the cylinder from each intake port after injection valve injection is uneven
In addition, if only one of the fuel injection valves is used to inject fuel in order to learn the variation in injection characteristics as in the method described in Patent Document 1, the fuel supplied to the cylinder may be biased (inhomogeneous), resulting in fuel Deterioration of economy and / or exhaust emissions (THC, CO, 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

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0052] [System structure of internal combustion engine]

[0053] figure 1 It is a figure for demonstrating the system structure of the internal combustion engine 10 of Embodiment 1 of this invention. The number of cylinders and the arrangement of the cylinders of the internal combustion engine of the present invention are not particularly limited, but as an example, the internal combustion engine 10 of the present embodiment is a tandem four-cylinder engine having four cylinders #1 to #4.

[0054] A piston 12 is provided in each cylinder of the internal combustion engine 10. In each cylinder, a combustion chamber 14 is formed on the top side of the piston 12. The combustion chamber 14 communicates with the intake passage 16 and the exhaust passage 18. An air flow meter 20 is provided near the entrance of the intake passage 16, and the air flow meter 20 outputs a signal corresponding to the flow rate of air sucked into the intake passage 16.

[0055] A throttle valve 22 is provided...

Embodiment approach 2

[0093] Next, refer to Image 6 The second embodiment of the present invention will be described.

[0094] The system of this embodiment can be used figure 1 The hardware structure shown and make ECU54 replace Figure 5 The routine shown is executed later Image 6 The routine shown is implemented.

[0095] The control of the first embodiment described above is also executed in the system of this embodiment. On this basis, in the present embodiment, the first exhaust valve 32a and the second exhaust valve 32b are alternated every predetermined period before obtaining the first and second air-fuel ratios A / F1 and A / F2. Open exhaust valve.

[0096] Image 6 It is a flowchart showing a control routine executed by the ECU 54 in order to realize the control of the second embodiment of the present invention. In addition, in Image 6 Regarding the Figure 5 Steps that are the same as the steps shown are marked with the same reference numerals and their description is omitted or simply descr...

Embodiment approach 3

[0105] Next, refer to Figure 7 The third embodiment of the present invention will be described.

[0106] The system of this embodiment can be used figure 1 The hardware structure shown and make ECU54 replace Image 6 The routine shown is executed later Figure 7 The routine shown is implemented.

[0107] The system of the present embodiment is characterized in that when the control during the warm-up operation of the second embodiment described above is executed during light-load operation, the following control is additionally executed. That is, in this embodiment, when at least one of the first and second air-fuel ratios A / F1 and A / F2 acquired during light-load operation exhibits a value that is leaner with respect to a predetermined determination value, increase and exhibit At least one of the first and second air-fuel ratios A / F1 and A / F2 of this lean value corresponds to the fuel injection amount of at least one of the first and second fuel injection valves 30a and 30b.

[010...

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PUM

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Abstract

A control device for an internal combustion engine is provided with first and second intake ports (16a, 16b) independent of each other, and first and second fuel injection valves (30a, 30b) provided for the first and second intake ports (16a, 16b), respectively, in each cylinder. Under a situation where an exhaust variable valve mechanism (38) is controlled such that a first exhaust valve (32a) is opened earlier than a second exhaust valve (32b), first and second air-fuel ratios (A / F1, A / F2) are acquired, respectively, in the first half and the second half of an exhaust stroke. When the acquired first air-fuel ratio (A / F1) (or the second air-fuel ratio (A / F2)) is lean, the fuel injection quantity in the next cycle by the first or second fuel injection valve (30a, 30b) corresponding to the first air-fuel ratio (A / F1) (or the second air-fuel ratio (A / F2)) that is lean is reduced.

Description

Technical field [0001] The present invention relates to a control device for an internal combustion engine, and more particularly, to a control device for an internal combustion engine suitable for controlling an internal combustion engine in which a plurality of intake ports are respectively provided with fuel injection valves, and the plurality of intake ports are provided for the same cylinder. Background technique [0002] Conventionally, for example, Patent Document 1 discloses an air-fuel ratio learning control device for an internal combustion engine in which two intake ports provided in each cylinder are respectively provided with fuel injection valves. In this conventional control device, in order to be able to learn and correct the difference in the injection characteristics of the two fuel injection valves of each cylinder, the following control is performed. In other words, only one of the two fuel injection valves of each cylinder is temporarily driven in order, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14
CPCF02D13/0253F02D41/1455F02M35/1085F02D41/0002F02D2041/001Y02T10/42Y02T10/18Y02T10/44F02D13/0249F02M35/10177F02D13/0215F02D13/0257F02D41/40F02D41/1443F02D41/3094Y02T10/12Y02T10/40
Inventor 森幸生
Owner TOYOTA JIDOSHA KK
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