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EGR control system for internal combustion engine

A control system and internal combustion engine technology, applied in engine control, internal combustion piston engine, electrical control, etc., can solve problems such as torque fluctuation, misfire, and increased discharge of unburned fuel components, and achieve the effect of suppressing misfire and suppressing deviation

Inactive Publication Date: 2012-05-23
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the amount of EGR gas is excessively increased, it may cause misfire, torque fluctuation, or increase in the discharge amount of unburned fuel components
And, when the increase in the amount of EGR gas as described above is realized, such problems are more likely to occur

Method used

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  • EGR control system for internal combustion engine
  • EGR control system for internal combustion engine
  • EGR control system for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] based on Figure 1 ~ Figure 4 Example 1 of the present invention will be described.

[0065] (Schematic configuration of an internal combustion engine and its intake and exhaust systems)

[0066] figure 1 It is a diagram showing a schematic configuration of an internal combustion engine and its intake and exhaust systems according to the present embodiment. The internal combustion engine 1 is a gasoline engine for driving a vehicle having four cylinders 2 . An intake port 3 and an exhaust port (not shown) are connected to each cylinder 2 . The openings of the intake port 3 and the exhaust port into the cylinder 2 are opened and closed by an intake valve 4 and an exhaust valve 5 , respectively. In addition, in the internal combustion engine 1 , a fuel injection valve and a spark plug (not shown) are provided for each cylinder 2 .

[0067] The internal combustion engine 1 has an intake variable valve train (hereinafter referred to as intake VVT) 18 and an exhaust var...

Embodiment 2

[0108] based on Figure 5 to Figure 7 Example 2 of the present invention will be described. In addition, only the point different from Example 1 is demonstrated here.

[0109] (Control when EGR valve is open and stuck)

[0110] In this embodiment, when the operating state of the internal combustion engine 1 belongs to figure 2 Even when the EGR valve 15 is open and stuck in the operation region B shown, the increase in the total amount of EGR gas and the EGR between cylinders are suppressed by reducing the exhaust pressure in the exhaust passage 9 in the same manner as in the first embodiment. Deviation of gas volume. However, the method of reducing the exhaust pressure is different from that of Example 1.

[0111] Hereinafter, a method of reducing the exhaust pressure when the EGR valve 15 is open and stuck according to the present embodiment will be described. In the present embodiment, when the opening of the stuck EGR valve 15 is equal to or less than the first predete...

Deformed example 1

[0136] Next, Modification 1 of the present embodiment will be described. In this modified example, when the operating state of the internal combustion engine 1 belongs to figure 2When the EGR valve 15 is open and stuck in the operation region B shown, if the opening degree is less than or equal to the first predetermined opening degree, the air-fuel ratio of the air-fuel mixture of the internal combustion engine 1 is also made higher than the reference air-fuel ratio to reduce the exhaust gas. pressure. In this case, the increase amount of the EGR gas is smaller than when the opening degree of the EGR valve 15 is larger than the first predetermined opening degree. Therefore, the target air-fuel ratio when the air-fuel ratio of the air-fuel mixture of the internal combustion engine 1 is made higher than the reference air-fuel ratio is set to a lower value than when the opening degree of the EGR valve 15 is larger than the first predetermined opening degree. Accordingly, it i...

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PUM

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Abstract

Disclosed is an EGR device for an internal combustion engine wherein an EGR passage is branched, on the side of an intake system, into a plurality of EGR branch pipes which are connected, respectively, with intake branch pipes provided for respective cylinders, and variations in the amount of EGR gas between cylinders is minimized upon occurrence of open sticking of an EGR valve. Upon occurrence of open sticking of an EGR valve, an exhaust pressure in the exhaust system of the internal combustion engine is reduced while a drop in driving power of a vehicle mounting the internal combustion engine is limited to within an allowable range.

Description

technical field [0001] The present invention relates to an EGR control system for an internal combustion engine. Background technique [0002] Conventionally, there is known an EGR device that introduces exhaust gas of an internal combustion engine into an intake system of the internal combustion engine as EGR gas. By supplying EGR gas to the internal combustion engine, NOx in the exhaust gas can be reduced and fuel consumption can be improved. In addition, in recent years, in order to further increase the effect of supplying the EGR gas, a technique of increasing the supply amount of the EGR gas by increasing the diameter of the EGR passage or the like has been developed. [0003] In an internal combustion engine having an EGR device, when an EGR valve provided in an EGR passage becomes stuck in an open state (hereinafter referred to as stuck open), the amount of EGR gas may excessively increase. When the amount of EGR gas is excessively increased, misfire, torque fluctua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/07
CPCF02D41/0055F02M25/0701F02B2075/125F02M25/0754F02D41/0065F02D13/0215F02M25/0751F02D2041/227Y02T10/47F02M25/0702F02D2041/001F02M26/50F02M26/49F02M26/44F02M26/47Y02T10/40
Inventor 入泽泰之
Owner TOYOTA JIDOSHA KK
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