IMPROVED REVERSING FLOW CATALYTIC CONVERTER FOR INTERNAL COMBUSTION ENGINES

申请公布号：: WO2006125311(A1)
申请号：: WO2006CA00847
申请日期：: 2006.05.24
申请公布日期：: 2006.11.30
申请人：: ECOCING CORPORATION;ZHENG, MING;MIROSH, EDWARD, A.;READER, GRAHAM, T.
发明人：: ZHENG, MING;MIROSH, EDWARD, A.;READER, GRAHAM, T.
分类号：: F01N3/20;B01D53/94;F01N3/28
主分类号：: F01N3/20
摘要：: <p>A compact reversing flow catalytic converter with protection from overheating includes a valve unit which directs exhaust gases through a container filled with catalytic material to permit a bypass of catalytic material when a temperature of the material exceeds a predetermined threshold. The container defines a U-shaped gas passage that communicates with two parts at the top of the container. The valve unit is mounted to the top of the container and includes an intake and an exhaust cavity. The valve unit includes a valve disk having two openings therethrough. The valve disk rotates around perpendicular central axis between a first, a second and third positions. When overheating of the catalytic material is predicted, a controller relinquishes control of the valve disk and a center return mechanism rotates the valve disk to a third position, in which each of the openings communicates with both ports so that the exhaust gas flow bypasses catalytic material. The catalytic material is thus protected from damage due to overhearing. The advantage is a compact, reliable, highly efficient catalytic converter that is inexpensive to manufacture, durable, and adapted for extended service life. An alternate version of the compact reversing flow controller is also described wherein the valve unit and container are essentially as described above but the valve disk is a four position disk with the fourth position blocking communication between the valve housing and the container isolating the monolith so that maximum heat is retained during engine shut down. The valve is driven by a stepper motor that moves and holds the valve to its four positions including block, bypass, forward and reverse flow. The alternate version also replaces the oxidizing flow-through monolith with an oxidizing filter trap and adds a fuel injection system under control of the controller so that measured amounts of fuel can be injected into the valve inlet to enhance oxidation.</p>