Appeal 2007-0571
Application 10/277,004
having an EGR inlet 76 and an EGR outlet 78, and a second check valve 66 having
an EGR inlet 80 and an EGR outlet 82. The EGR inlet 76 is coupled to the EGR
exhaust outlet 36 by a fluid conduit 84, and the EGR inlet 80 is coupled to the
EGR exhaust outlet 38 by a fluid conduit 86. A Y-conduit 88 is respectively
connected at its Y-end to the EGR outlets 78, 82, and is connected at its single end
to an inlet port 90 of the regenerator directional flow control valve 68 (Bailey,
col. 5, ll. 12-20; Figure).
Bailey teaches that during operation, check valves 64, 66 permit fluid flow
only from their respective inputs 76, 80 to their respective outputs 78, 82, and
prohibit back flow of gases into the exhaust manifolds 14, 16 when the pressure at
the EGR outlets 78, 82 exceeds the pressure at the EGR inlets 76, 80, respectively
(Bailey, col. 6, ll. 57-62). As such, when the directional flow control valve 68 is
open to flow port 108 of the EGR system, check valve 64 prevents backflow from
conduit 60 (the intake pipe leading to intake manifold 24) to first exhaust
manifold 14. Check valve 64 also prevents backflow of exhaust gases from second
exhaust manifold 64 from entering first exhaust manifold 14. Similarly, when the
directional flow control valve 68 is open to flow port 108 of the EGR system,
check valve 66 prevents backflow from conduit 60 to second exhaust manifold 16.
Check valve 66 also prevents backflow of exhaust gases from first exhaust
manifold 14 from entering second exhaust manifold 16.
Bailey further discloses redirecting bleed air from conduit 60, via a bleed air
conduit 130, through the second particulate trap/stationary recuperator 58 in a
reverse flow direction. The bleed air is then discharged from the recuperator 58
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