Ex Parte Chen et al - Page 7



            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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