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EGR device

A technology of EGR valve and EGR cooler, which is applied in the direction of charging system, adding non-fuel substances to fuel, internal combustion piston engine, etc., can solve problems such as poor work and difficult cooling of EGR gas, and achieve the effect of preventing thermal deterioration

Inactive Publication Date: 2008-01-09
ISUZU MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the operating part of the EGR valve 31 is fixed, resulting in malfunction.
[0010] Therefore, in the conventional EGR device, it is actually difficult to increase the degree of cooling of the EGR gas

Method used

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Examples

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Embodiment 1

[0031] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] FIG. 1 is a schematic diagram of an EGR device according to the present embodiment.

[0033] The EGR device of the present embodiment is applicable to a diesel engine, and the diesel engine has: an engine 1; an intake passage 3 connected to the engine 1 through an intake manifold 2; an intercooler 5 arranged on the intake passage 3; The downstream side of the device 5 is arranged on the throttle valve (throttle) 6 on the intake passage 3; the exhaust passage 9 connected to the engine 1 through the exhaust manifold 7; A turbine (turbine) 10 on 9 and a compressor 11 arranged on the intake passage 3; a controller 13 for electronically controlling various devices such as the throttle valve 6 and the like.

[0034] The EGR device has: an EGR passage 15 communicating with the exhaust passage 9 on the upstream side of the turbine 10 and the i...

Embodiment 2

[0053] Next, another embodiment will be described using FIG. 3 .

[0054] The basic structure of this embodiment is the same as that shown in FIG. 1 , and the same reference numerals are assigned to the same constituent elements as in FIG. 1 , and description thereof will be omitted, and only differences will be described.

[0055] This embodiment is characterized in that a bypass passage 19 is provided in the EGR passage 15, which communicates the installation position of the EGR valve 17' and the EGR cooler 16b (second cooler) downstream of the EGR valve 17'. As the EGR valve 17', the exhaust gas flowing into the EGR valve 17' can be selectively flowed into either the EGR passage 15 on the downstream side or the bypass passage 19, and a directional switching valve that can adjust its flow rate is used. .

[0056] In this embodiment, the controller 13 switches the EGR valve 17 ′ so that the EGR gas that has passed through the first cooler 16 a flows into the bypass passage 1...

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Abstract

An EGR device, comprising an EGR passage (15) allowing an exhaust passage (9) to communicate with an intake passage (3) to supply a part of exhaust gas flowing in the exhaust passage (9) of an engine (1) to the intake passage (3), EGR coolers (16a) and (16b) installed in the EGR passage (15) and cooling the exhaust gas flowing in the EGR passage (15), and an EGR valve (17) installed in the EGR passage (15) and regulating the flow of the exhaust gas supplied from the EGR passage (15) to the intake passage (3). The plurality of EGR coolers (16a) and (16b) are installed in the EGR passage (15), and the EGR valve (17) is disposed between any adjacent two EGR coolers (16a) and (16b) among the plurality of EGR coolers (16a) and (16b).

Description

technical field [0001] The present invention relates to an EGR device which can reduce the emission of NOx by supplying part of the exhaust gas flowing through the exhaust passage of the engine to the intake passage to lower the combustion temperature of the mixture gas, and to supply the exhaust gas to the intake passage. Exhaust gas (EGR gas) is cooled to a lower temperature. Background technique [0002] As an emission countermeasure for diesel engines and the like, EGR (exhaust gas recirculation) devices that supply part of the exhaust gas flowing through the exhaust passage to the intake passage to lower the combustion temperature of the air-fuel mixture and suppress the generation of NOx are well known and widely used ( Patent Document 1, etc.). [0003] For example, as shown in FIG. 4, the EGR device has an EGR passage 15 communicating with the exhaust passage 9 of the engine 1 and the intake passage 3, an EGR cooler 30 provided on the EGR passage 15, and an EGR cool...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/07
CPCF02M25/0738F02M25/0732Y02T10/121F02M25/0707F02B29/0406F02M25/0728F02M26/05F02M26/24F02M26/25F02M26/33
Inventor 植田隆广
Owner ISUZU MOTORS LTD
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