PREVENTING EGR SYSTEM SOOT CONTAMINATION
A diesel engine system is provided with an exhaust passage having a diesel particulate filter disposed in the passage. An exhaust gas recirculation passage is connected to the exhaust passage at a downstream location of the diesel particulate filter and in communication with the air intake passage. By locating the connection to the exhaust passage at a location downstream from the diesel particulate filter, the exhaust gas recirculation passage and the exhaust gas recirculation cooler disposed therein are isolated from soot contamination.
1 . An engine system, comprising:
a diesel engine;
an exhaust passage connected to the diesel engine;
a diesel particulate filter disposed in the exhaust passage;
an air intake passage for supplying air to the diesel engine; and
an exhaust gas recirculation passage connected to the exhaust passage downstream of the diesel particulate filter and in communication with the air intake passage.
2 . The engine system according to claim 1 , further comprising an exhaust gas recirculation cooler in the exhaust gas recirculation passage.
3 . The engine system according to claim 1 , further comprising an exhaust gas recirculation valve in the exhaust gas recirculation passage.
4 . The engine system according to claim 3 , further comprising an engine controller for controlling operation of the exhaust gas recirculation valve.
5 . An exhaust gas recirculation system for a diesel engine, comprising:
an exhaust passage connected to the diesel engine;
a diesel particulate filter disposed in the exhaust passage;
an exhaust gas recirculation passage connected to the exhaust passage downstream of the diesel particulate filter and in communication with an air intake passage of the diesel engine.
6 . The exhaust gas recirculation system according to claim 5 , further comprising an exhaust gas recirculation cooler in the exhaust gas recirculation passage.
7 . The exhaust gas recirculation system according to claim 5 , further comprising an exhaust gas recirculation valve in the exhaust gas recirculation passage.
8 . The exhaust recirculation system according to claim 7 , further comprising an engine controller for controlling operation of the exhaust gas recirculation valve.