Diesel engine EGR system with exhaust gas conditioning
First Claim
1. An exhaust gas recirculation system for a supercharged diesel engine of the type having an aftercooler operatively disposed between a supercharging device and an intake manifold of said engine comprising an exhaust gas recirculation means selectively operable to feed exhaust gases from said engine directly to said intake manifold, said exhaust gas recirculation means including selectively operable communication means for communicating a portion of said exhaust gases from said exhaust gas recirculation means to said aftercooler, and a conditioning device operatively disposed in said communication means to remove diesel particulate matter from exhaust gas communicated to the aftercooler.
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Accused Products
Abstract
The exhaust gas recirculation system which includes a diverter valve system for selectively directing recirculated gas through an aftercooler includes a self regenerating catalyzed particulate filter which is positioned upstream of the aftercooler of the system to prevent soot from accumulating on the heat exchange surfaces of the aftercooler. Removal of the soot from the exhaust gas increases efficiency and longevity of the aftercooler.
90 Citations
12 Claims
- 1. An exhaust gas recirculation system for a supercharged diesel engine of the type having an aftercooler operatively disposed between a supercharging device and an intake manifold of said engine comprising an exhaust gas recirculation means selectively operable to feed exhaust gases from said engine directly to said intake manifold, said exhaust gas recirculation means including selectively operable communication means for communicating a portion of said exhaust gases from said exhaust gas recirculation means to said aftercooler, and a conditioning device operatively disposed in said communication means to remove diesel particulate matter from exhaust gas communicated to the aftercooler.
- 6. In an exhaust gas recirculation system for a supercharged diesel engine of the type having an aftercooler operatively disposed between a supercharging device and an intake manifold of said engine and an exhaust gas recirculation means selectively operable to feed exhaust gases from said engine to said intake manifold, said exhaust gas recirculation means including selectively operable communication means for communicating a portion of said exhaust gases from said exhaust gas recirculation means to said aftercooler, the improvement comprising a self-regenerating catalyzed particulate filter operatively disposed in said communication means to remove diesel particulate matter from exhaust gas communicated to the aftercooler, said catalyze particulate filter having a lower operating temperature limit for vaporizing soot within a range of normal operating temperatures of a diesel engine, and valve means for selectively allowing modulated entry of recirculated exhaust gas to said communication means in response to a predetermined intake manifold temperature.
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10. In combination with an electronically-controlled diesel engine having an engine control unit, an intake manifold, an exhaust manifold, a turbocharger having a turbine operatively connected to said exhaust manifold and a compressor operatively connected to said intake manifold, and an aftercooler fluidly connected between said compressor and said intake manifold, an exhaust gas recirculation system having selectively controlled fluid communication means for directing exhaust gas from said exhaust manifold through said aftercooler to said intake manifold comprising:
a catalyzed particulate filter fluidly connected between said exhaust manifold and said aftercooler and a passage for directing exhaust gas to said intake manifold independently of said aftercooler and a selectively-controlled diverter valve disposed to control the proportion of exhaust gas directed to said aftercooler based on a desired intake manifold temperature selected from a range of temperatures dependent on engine speed and load stored in said engine control unit. - View Dependent Claims (11, 12)
Specification