Method and device for an EGR-system and a valve as well as a regulation method and device

a technology of egr-system and valve, which is applied in the direction of electric control, machines/engines, transportation and packaging, etc., can solve the problems of complicated valve device, and achieve the effect of reducing the nox contents

Inactive Publication Date: 2005-07-07
STT EMTEC AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] The use of an EGR-system as contemplated by the invention on an engine provided with a catalyst and a particle filter according to the prior art results in a substantial reduction of the NOx contents. This reduction may be up to 50% and makes it possible to upgrade existing diesel engines to present emission requirements and to upgrade modern diesel engines to future emission requirements.

Problems solved by technology

Although this prior art makes it possible to use an EGR-system in super charged diesel engines, where the pressure in the intake system downstream of the super charger is higher than the pressure in a recirculation conduit from an EGR-valve some important disadvantages are inherent in this prior art.
Separate drive motors are provided for these dampers, a fact which makes the valve device complicated and this also applies for a control device therefor.

Method used

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  • Method and device for an EGR-system and a valve as well as a regulation method and device
  • Method and device for an EGR-system and a valve as well as a regulation method and device
  • Method and device for an EGR-system and a valve as well as a regulation method and device

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Embodiment Construction

[0020]FIG. 1 is a diagrammatical view showing the parts, which are essential to the invention, of a combustion engine indicated with the reference character 1. The engine is in the selected embodiment example a turbo charged diesel engine but as already mentioned the engine may be a diesel engine without super charging or a diesel engine with a different type of super charging than a turbo charger. Air is taken to the engine 1 through an air intake, an air filter 2, and is directed via an inlet air channel 3 to a turbo charger 4, where the air is super charged and then conveyed further through an intercooler 5, where the super charged air is cooled down before it is conveyed into the engine 1. The exhaust gases from the engine 1 are first directed through the second side of the turbo charger 4, namely that side which is the driving one, and then through an exhaust pipe 6, a catalyst 7 and a particle trap 8 to finally be emitted to the open air via an end pipe 9.

[0021] From the end ...

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PUM

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Abstract

The invention is related to a method and a device for recirculation of a part of exhaust gases from an exhaust pipe (6, 9) of a diesel engine (1) to the inlet of the engine, the exhaust gases being diverted from the exhaust pipe (6, 9) and directed through a recirculation conduit (10) to a controllable valve device (12) arranged between the engine and the air intake (2) thereof for allowing supply of air/recirculated exhaust gases in a desired relation to the combustion chamber of the engine (1). The invention also relates to a particular valve having two controllable inlets, said valve being useful in the method or device according to the invention, and a regulation method and device for regulating the air/fuel relation of a diesel engine.

Description

[0001] The present invention is related to a method and a device for an EGR-system (Exhaust Gas Recirculation), particularly for use in heavy-duty diesel engines. The invention also relates to a valve which is particularly suited for the method and device according to the invention but the valve may also find use within other fields. Finally, the invention is also related to a regulation method and device for a diesel engine. [0002] In order to reduce the contents of hazardous exhaust gases, particularly nitrogen oxide (NOx), so called EGR-systems are used since many years in many types of combustion engines. Such systems admit a part of the exhaust gases to be recirculated to the intake system of the engine, where it is mixed with the intake air and is conveyed further to the combustion chamber of the engine. The recirculated exhaust gases replace a part of the intake air and have a reducing effect on the formation of NOx. A so called EGR-valve is then placed in connection with the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F02B29/04F02B37/00F02D9/02F02D21/08F02D41/02F02D43/00F02MF02M25/07F16K1/22F16K11/052F16K11/14F16K11/16
CPCF02B29/0406F02D2009/0276F02M25/0709F02M25/0718F02M25/0724F16K11/165F02M25/0756F02M25/0773F02M25/0786F02M25/0793F02M25/0727F02M26/48F02M26/06F02M26/15F02M26/21F02M26/23F02M26/54F02M26/64F02M26/70Y10T137/87161
Inventor ERIKSSON, INGEMARBLOMQUIST, MICAEL
Owner STT EMTEC AB
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