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EGR gas cooling system

Inactive Publication Date: 2014-07-30
CALSONIC KANSEI CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when the engine is under high load, the temperature of the exhaust gas rises, and if it is returned to the intake system of the engine as it is, the combustion temperature rises, and the concentration of nitrogen oxides in the exhaust gas increases on the contrary.

Method used

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no. 1 approach ＞

[0050] Next, an EGR gas cooling system according to a first embodiment of the present invention will be described.

[0051] This EGR gas cooling system is used in vehicles that perform a large amount of exhaust gas recirculation (EGR) in order to comply with exhaust gas emission regulations, such as trucks and construction machinery employing medium-sized and large-sized diesel engines.

[0052] To cool large volumes of EGR gas such as figure 1 As shown, the vehicle has two EGR coolers consisting of a primary EGR cooler 1 and a secondary EGR cooler 2 . The EGR gas passes through the pipes from the exhaust system of the engine 3 , flows through the primary EGR cooler 1 and the secondary EGR cooler 2 in order to be cooled, and returns to the intake system of the engine 3 (EGR gas pipe 14 ).

[0053] Also, in this vehicle, supercharged air obtained by compressing intake air by the turbocharger 4 is cooled by running wind in the intercooler 5 and supplied to the intake system of...

no. 2 approach ＞

[0070] Next, an EGR gas cooling system according to a second embodiment of the present invention will be described.

[0071] In the EGR gas cooling system of the second embodiment, the main cooling water circuit 6 that circulates cooling water between the engine 3, the main radiator 7, and the primary EGR cooler 1 is also provided; The sub-EGR cooler 2 is the same as the first embodiment in that a low-temperature cooling water circuit 9 through which cooling water is circulated is provided.

[0072] The second embodiment differs from the first embodiment in that a solenoid valve 13 (an example of a flow rate control device) is provided near the outflow port leading out the cooling water from the engine 3 to the low-temperature cooling water circuit 9 .

[0073] The solenoid valve 13 is controlled by a signal from a vehicle-mounted control computer (not shown).

[0074] As an example of the control method of the electromagnetic valve 13, in the second embodiment, it is set tha...

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Abstract

One of the purposes of the present invention is to provide an EGR gas cooling system in which is made possible a rapid increase in the temperature of the cooling gas after the engine is started. This EGR gas cooling system has: a main cooling water circuit (6) for circulating cooling water for cooling an engine (3) between the engine (3), a main radiator (7) for causing the cooling water to release heat, and a primary EGR cooler (1) for cooling EGR gas using the cooling water; and a low-temperature cooling water circuit (9) for circulating the cooling water between: the engine (3); a sub-radiator (10), provided integrally with or separately from the main radiator (7), for causing the cooling water to release heat; and a secondary EGR cooler (2) for cooling the EGR gas using the cooling water; a flow rate control device (12) for controlling the flow rate of the cooling water being provided partway between the sub-radiator (10) and the engine (3) of the low-temperature cooling water circuit (9).

Description

technical field [0001] The present invention relates to a cooling water circulation system and its control for circulating heat exchangers mounted in automobiles. Background technique [0002] As a countermeasure against air pollution caused by exhaust gas from automobiles, an EGR system that recirculates exhaust gas to the engine is widely used in vehicles equipped with diesel engines. [0003] However, when the engine is under high load, the temperature of the exhaust gas rises, and if it is returned to the intake system of the engine as it is, the combustion temperature rises, and the concentration of nitrogen oxides in the exhaust gas increases on the contrary. Therefore, a heat exchanger (EGR cooler) is generally provided, and the exhaust gas is cooled by cooling water and then returned to the engine. [0004] The cooling water of the EGR cooler doubles as the cooling water of the engine. [0005] The flow path formed by the main cooling water circuit is: the cooling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/07
CPCF02B29/0406F01P7/165F01P2003/187F02M26/05F02M26/25F02M26/28F02M26/24F02M26/33Y02T10/12F01P3/20F01P2060/02
Inventor 酒川佳横山裕一
Owner CALSONIC KANSEI CORP
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