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Control system for internal combustion engine

A control system, a technology for internal combustion engines, applied in engine control, fuel injection control, internal combustion piston engines, etc., to solve problems such as increased exhaust emissions, different intake air volumes, and reduced combustion stability

Inactive Publication Date: 2012-03-14
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the injection ratio of the first fuel injection valve and the second fuel injection valve changes in transition, the intake air amount obtained by the air flow meter or the like may differ from the actual intake air amount.
[0009] In the above cases, if the control parameters such as the fuel injection amount are determined based on the obtained value of the intake air amount, it may lead to a decrease in combustion stability and an increase in exhaust emissions.

Method used

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  • Control system for internal combustion engine
  • Control system for internal combustion engine
  • Control system for internal combustion engine

Examples

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Embodiment 1

[0053] First, based on Figure 1 to Figure 10 A first embodiment of the present invention will be described. figure 1 is a diagram showing a schematic configuration of an internal combustion engine to which the present invention is applied.

[0054] figure 1 The shown internal combustion engine 1 is a 4-stroke cycle spark ignition internal combustion engine (gasoline engine) having a plurality of cylinders. Among them, in figure 1 In represents only 1 cylinder among the plurality of cylinders.

[0055] A piston 3 is slidably housed in each cylinder 2 of the internal combustion engine 1 . The piston 3 is connected to an unillustrated output shaft (crankshaft) via a connecting rod 4 . Furthermore, a first fuel injection valve 5 for injecting fuel into the cylinder and an ignition plug 6 for igniting the air-fuel mixture in the cylinder are attached to each cylinder 2 .

[0056] The inside of the cylinder 2 communicates with an intake port 7 and an exhaust port 8 . An open...

Embodiment 2

[0094] Next, based on Figure 11 A second embodiment of the present invention will be described. Here, configurations different from those of the aforementioned first embodiment will be described, and descriptions of the same configurations will be omitted.

[0095] In the aforementioned first embodiment, an example was described in which the detection value of the air flow meter 72 is corrected when the in-cylinder injection ratio changes transitionally. However, in this embodiment, when the in-cylinder injection ratio and This is an example of correcting the detection value of the air flow meter 72 at the transient time when the opening degree of the EGR valve 13 is changed.

[0096] For example, when the operating state of the internal combustion engine 1 shifts from the EGR non-operating region to the EGR operating region, the actual opening degree of the EGR valve 13 does not immediately converge to the target EGR valve opening degree. In addition, since the EGR gas tra...

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Abstract

Disclosed is a control system for an internal combustion engine provided with a first fuel injection valve for injecting fuel to a cylinder; a second fuel injection valve for injecting fuel to an intake port; and an EGR mechanism, wherein the quantity of intake air can be obtained accurately when the EGR mechanism is operated. In the control system for an internal combustion engine provided with a first fuel injection valve for injecting fuel to a cylinder; a second fuel injection valve for injecting fuel to an intake port; an EGR passage for introducing an EGR gas from an exhaust air passage to an intake air passage of the internal combustion engine; an EGR valve provided in the EGR passage; and an obtaining means for obtaining the quantity of intake air of the internal combustion engine, when the EGR valve is opened, whether the quantity of intake air tends to increase or decrease with respect to the change of the cylinder injection ratio is judged on the basis of the value of the cylinder injection ratio, and the obtained value of the quantity of intake air is corrected in accordance with the judged result.

Description

technical field [0001] The present invention relates to a control system for an internal combustion engine including a fuel injection valve injecting fuel into a cylinder and a fuel injection valve injecting fuel into an intake port. Background technique [0002] Patent Document 1 describes a technology that, in an internal combustion engine provided with a first fuel injection valve that injects fuel into a cylinder and a second fuel injection valve that injects fuel into an intake port, when the engine speed is low, by increasing The injection ratio of the first fuel injection valve and the second fuel injection valve improves the filling efficiency of the intake air. [0003] Patent Document 2 describes a technique for cooling intake air in a cylinder by reducing the amount of fuel injected from the fuel injection valve per unit time in an internal combustion engine including a fuel injection valve injecting fuel into the cylinder. [0004] Patent Document 3 describes a ...

Claims

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Application Information

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IPC IPC(8): F02D41/04F02D21/08F02D41/34F02D45/00F02M63/00
CPCF02B23/104F02D41/0057F02D41/3094F02M69/046F02D41/0072F02D41/182F02M26/64Y02T10/40F02D11/10F02D41/0047F02D41/402
Inventor 北东宏之品川知广佐竹信行
Owner TOYOTA JIDOSHA KK
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