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Low-idle exhaust gas recirculation system

A technology of recirculation system and air system, applied in exhaust gas recirculation, charging system, electrical control, etc., can solve problems such as engine efficiency reduction

Inactive Publication Date: 2009-08-19
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

and the efficiency of the engine may be reduced even more by excessively restricting the remainder of the engine operating cycle

Method used

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  • Low-idle exhaust gas recirculation system
  • Low-idle exhaust gas recirculation system

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Embodiment Construction

[0012] figure 1 An exemplary power system 10 is shown having an engine 12 capable of combusting an air and fuel mixture and producing a mechanical output and exhaust flow. The power system 10 may also include an air system 14 , an exhaust gas treatment system 16 , and an exhaust gas recirculation (EGR) system 18 . Air system 14 may supply air to engine 12 to facilitate the combustion process. Exhaust treatment system 16 may reduce pollutants released into the atmosphere by engine 12 . The EGR system 18 may recirculate a portion of exhaust gas generated by the engine 12 back into the intake of the engine 12 .

[0013] Engine 12 may be any type of conventional diesel, gasoline or gas fueled internal combustion engine and may include at least one combustion chamber 20 , an intake manifold 22 , a first exhaust manifold 24 and a second exhaust manifold 26 . An intake manifold 22 may channel air from the system 14 to the combustion chamber 20 . Exhaust gases generated within com...

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Abstract

An exhaust recirculation system (18) is provided for reducing NOx emitted from the power source (12) at low-idle speeds. The power source has at least one combustion chamber (20), an intake manifold (22), a first exhaust manifold (24), and a second exhaust manifold (26). The exhaust recirculation system has a valve (40) located in at least one of the first or second exhaust manifolds. The valve is moveable to increase the temperature of an exhaust gas by directing exhaust gas from the at least one of the first and second exhaust manifolds to the intake manifold. Furthermore, the exhaust recirculation system has a controller (46) configured to determine at least one power source condition indicative of an exhaust temperature and move the valve in response to the determination.

Description

technical field [0001] The present invention generally relates to an exhaust gas recirculation system, and more particularly, the present invention relates to an exhaust gas recirculation system for low idle nitrogen oxide reduction. Background technique [0002] Internal combustion engines, including diesel engines, gasoline engines, natural gas engines, and others known in the art, emit complex mixtures of air pollutants. Air pollutants consist of solid particulate matter and gaseous compounds including nitrogen oxides (NOx). With increasing environmental concerns, emission standards have become more stringent and regulate the amount of solid particulate matter and gaseous compounds emitted from an engine to the atmosphere depending on the type, size and / or class of the engine. [0003] Engine manufacturers have taken a number of steps to comply with these engine emissions regulations. One approach involves the use of catalytic devices such as selective catalytic reducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02M25/07F02D41/14
CPCF02D41/1446F02D41/005Y02T10/47F02M25/0719F02M25/0711F02D41/08F02B29/0406F02M25/0749F02M26/08F02M26/16F02M26/43Y02T10/40
Inventor D·A·皮尔庞特
Owner CATERPILLAR INC