Apparatus for cooling EGR gas

A technology of gas cooling and gas cooler, which is applied in the direction of mechanical equipment, heat exchange equipment, lighting and heating equipment, etc., and can solve the problem that the actuator cannot work smoothly

Inactive Publication Date: 2005-08-10
USUI KOKUSAI SANGYO KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low temperature EGR gases may contain highly corrosive condensate sticky soot with high bulk density particles
EGR gas containing this substance is leaked to the actuator, corrodes parts or deposits soot, making the actuator not work smoothly

Method used

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  • Apparatus for cooling EGR gas
  • Apparatus for cooling EGR gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Refer below figure 1Embodiment 1 in which the EGR gas cooling equipment of the present invention is applied to automobiles is described. A pre-EGR gas cooler 1 is connected to one end of an introduction pipe 2 in which a connecting hole (not shown) of an EGR pipe at the exhaust gas manifold end is installed to perform a first cooling step by introducing high-temperature EGR gas. The medium-temperature EGR gas cooled in the front EGR gas cooler 1 is introduced into the rear EGR gas cooler 3 to cool to the required temperature, and the rear EGR gas cooler 3 is connected in series to the front through the second gas supply pipe 4 One end of the EGR gas cooler. The rear EGR gas cooler 3 is connected to the outlet pipe 5, which is connected to the intake manifold and passes at the other end thereof, so that it can send the low-temperature EGR gas cooled to the required temperature to the intake manifold.

[0031] The EGR valve 6 is installed on the gas supply pipe 4 betwee...

Embodiment 2

[0048] exist figure 2 In the shown second embodiment, the same as the first embodiment, the front EGR gas cooler 1 is connected in series with the rear EGR gas cooler 3, and the EGR valve 6 is installed in the second supply chain connected to the coolers 1 and 3. On the air pipe 4, the amount of EGR gas introduced into the EGR gas cooling device can be adjusted. Furthermore, in the second embodiment, the temperature sensor 27 is installed between the pre-EGR gas cooler 1 and the EGR valve 6 . The temperature sensor measures the temperature of the medium-temperature EGR gas cooled by the pre-EGR cooler, and monitors the temperature so as to maintain it at 150°C to 200°C.

[0049] In addition, since the high-temperature EGR gas of 150°C or higher is introduced into the pre-EGR gas cooler 1, a high-boiling heat medium fluid, such as a fluorine inert solvent with a boiling point of 150°C or higher, is used so that the cooling liquid is not in the heat. The exchange section 12 b...

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Abstract

The pre-EGR gas cooler 1 for cooling the EGR gas introduced from the EGR pipe, and an post-EGR gas cooler for introducing the pre-EGR gas cooled in the EGR gas cooler 1 to cool it to a target cooling temperature are coupled in series, and an EGR valve is mounted for controlling the flow rate of the EGR gas between the pre-EGR gas cooler 1 and the post-EGR gas cooler 3. According to the invention, EGR gas cooling apparatus with improved durability can be obtained, and EGR valves with low product cost and high storage efficiency can be provided.

Description

technical field [0001] The present invention relates to an EGR gas cooling device that cools EGR gas by exchanging heat with a cooling medium, and more particularly, to an EGR gas cooling device with improved durability, on which an EGR valve is prevented from being exposed to a high temperature, The durability of the equipment is thereby improved, and the EGR valve provided on the EGR gas cooling equipment controls the flow rate of the EGR gas sent to the intake air. Background technique [0002] Generally, an EGR (Exhaust Gas Re-circulation) system is used in automobile engines such as gasoline engines and diesel engines. In the EGR system, under the control of the EGR valve, part of the exhaust gas is taken from the exhaust system and then returned to the intake of the engine. gas system for addition to the gas mixture or intake air. Such an EGR system, especially a high EGR rate cooling EGR system for a diesel engine, has an EGR gas cooling device that uses coolant such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/07F28D15/02F28F13/18F28F21/06
CPCF28F21/062F02M25/0714F02M25/0737F02M25/0701F28F13/18F02M25/0754F28D21/0003F02M25/0738F02M25/0731F02M25/0732F28D15/0266Y02T10/121F28F21/083F02M26/11F02M26/24F02M26/28F02M26/32F02M26/33F02M26/47F02M26/50
Inventor 臼井正一郎
Owner USUI KOKUSAI SANGYO KAISHA LTD
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