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Control device for internal combustion engine and internal combustion engine

A technology for control devices and internal combustion engines, which is applied in the direction of engine control, fuel injection devices, fuel injection control, etc., can solve the problems of reduced output of internal combustion engines, reduced flow coefficient of air intake ports, stricter manufacturing tolerances of internal combustion engines, etc., to achieve output suppression or The effect of reducing the combustion consumption rate

Inactive Publication Date: 2012-07-25
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the internal combustion engine disclosed in Patent Document 1, although it is possible to reduce the droplets reaching the wall surface of the combustion chamber by colliding the sprayed fuel in the combustion chamber, there is a problem that the droplets splashed again due to the collision adhere to the wall surface.
In addition, in order for the sprayed fuel to collide with each other in the combustion chamber, it is necessary to accurately limit the injection direction of the fuel, and there is also a problem that the production tolerance of the internal combustion engine becomes strict.
Furthermore, when fuel is injected during the intake stroke, the behavior of the sprayed fuel is easily affected by the air flow generated during the intake stroke, so there is also a problem that the engine speed and the robustness against the load are reduced.
[0008] In addition, in the internal combustion engine disclosed in Patent Document 2, although the stratified air-fuel mixture can always be formed regardless of the operating conditions, the advantages of the homogeneous air-fuel mixture described above cannot be enjoyed.
In addition, by providing the partition wall in the intake port, the flow coefficient of the intake port decreases, causing the problem that the output of the internal combustion engine decreases or that the manufacturing man-hours of the internal combustion engine increase.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0047] First, refer to Figure 1 to Figure 22 Embodiment 1 of the control device for an internal combustion engine of the present invention will be described in detail. figure 1 and figure 2 It is a figure showing the basic structure of the internal combustion engine to which the said Embodiment 1 was applied, figure 1 shows a longitudinal sectional view of the internal combustion engine as a whole, figure 2 A schematic enlarged upper top view showing a fuel injection portion of an internal combustion engine. In addition, in Embodiments 1 to 4 described below, a single cylinder included in the internal combustion engine is extracted and described, but these embodiments can be applied to single cylinder and multi-cylinder internal combustion engines.

[0048] figure 1 The internal combustion engine 1 shown has a cylinder block 2 , a cylinder head 9 , a piston 3 inserted into the cylinder block 2 , the cylinder block 2 and the cylinder head 9 form a cylinder 11 of the inte...

Embodiment 2

[0094] Next, refer to Figure 21 and Figure 22 , Embodiment 2 of the control device for an internal combustion engine of the present invention will be described in detail. In addition, in this figure, the same code|symbol is attached|subjected to the same structure as Example 1, and is shown.

[0095] Embodiment 1 described above is an embodiment in which two fuel injection valves 20 are used for one cylinder 11 among one or more cylinders 11 provided on internal combustion engine 1 . In contrast, as Figure 21 As shown, Embodiment 2 is an embodiment in which one fuel injection valve 20 is used for one cylinder 11 among one or more cylinders 11 provided in internal combustion engine 1 . As shown in the figure, in Embodiment 2, a single fuel injection valve 20 is provided at the substantially central portion of the intake port 5 in which the branched intake ports (intake passages) 5A, 5B are integrated at the upstream side thereof, and from which the fuel injection The val...

Embodiment 3

[0102] Next, refer to Figure 23 and Figure 24 , Embodiment 3 of the control device for an internal combustion engine of the present invention will be described in detail. In addition, in this figure, the same code|symbol is attached|subjected to the same structure as Example 1, 2, and is shown.

[0103] Figure 23 It is a diagram showing another embodiment 3 in which one fuel injection valve 20 is used for one cylinder 11 among the single or plural cylinders 11 provided in the internal combustion engine 1 . In Embodiment 3, the spray fuel F in one direction is injected from the fuel injection valve 20 to the two intake valves 7A, 7B. Here, the central axis (injection direction) L20 of the sprayed fuel F points to the line segment connecting the center of the intake valve 7A (the center of the intake valve stem 7SA) and the center of the intake valve 7B (the center of the intake valve stem 7SB). Midpoint C side. In addition, the sprayed fuel F is sprayed at the positions...

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Abstract

A control device for an internal combustion engine that is capable of easily switching between a stratified operation mode and a non-stratified operation mode is provided for a port injection spark ignition internal combustion engine. Injection directions in which sprayed fuel (F)is injected from a fuel injection valve (20)are defined nearer the center of a cylinder (11)than the centers of two intake valves(7A,7B). Injection timing of the fuel injection valve(20) is controlled by the stratified operation mode completing the fuel injection in the exhaust stroke, and the non-stratified operation mode completing the fuel injection in a range from a compression stroke to the exhaust stroke. The injection end timing of the fuel injection valve in the stratified operation mode is retarded from the injection end timing in the non-stratified operation mode, in which the fuel injection time is equal to or shorter than that in the stratified operation mode.

Description

technical field [0001] The present invention relates to a control device for an internal combustion engine and an internal combustion engine, and more particularly to a control device for an internal combustion engine and an internal combustion engine capable of easily switching between stratified combustion and homogeneous combustion. Background technique [0002] A spark ignition type internal combustion engine is known to have a homogeneous operation mode in which the fuel concentration of the air-fuel mixture in the combustion chamber is uniformly combusted, and a stratified operation mode in which the fuel concentration around the spark plug is combusted higher than that in other parts. In the homogeneous combustion mode, since combustion is carried out in a state where fuel and air are well mixed, there is an advantage of incomplete combustion and less smoke emission. On the other hand, in the stratified combustion mode, since the ignitability of the air-fuel mixture i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/34F02D43/00F02D13/02F02M61/14
CPCF02D41/401Y02T10/44Y02T10/18F02D13/0265F02D41/068F02D13/0261F02D41/005F02D41/3029Y02T10/47F02M69/045F02M69/044Y02T10/12Y02T10/40
Inventor 助川义宽村上智之猿渡匡行神田高辅
Owner HITACHI AUTOMOTIVE SYST LTD