Energy recuperating gas filtering EGR particulate tray for EGR systems

• US 20020078935A1
• Filed: 12/21/2000
• Published: 06/27/2002
• Est. Priority Date: 12/21/2000
• Status: Abandoned Application

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Opris, Cornelius N.
• Application Number:
  US09/745,245
• Publication Number:
  US 20020078935A1
• Time in Patent Office: Days
• US Class Current: 123/568.11
• CPC Class Codes: F01N 3/0233 periodically cleaning filter by blowing a gas through the filter in a direction opposite to exhaust flow, e.g. exposing filter to engine air intake
• CPC Class Codes: F02B 29/0425 Air cooled heat exchangers
• CPC Class Codes: F02M 26/05 High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
• CPC Class Codes: F02M 26/23 Layout, e.g. schematics
• CPC Class Codes: F02M 26/35 with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
• CPC Class Codes: F02M 26/36 with means for adding fluids other than exhaust gas to the recirculation passage; with reformers
• CPC Class Codes: F02M 26/40 with timing means in the recirculation passage, e.g. cyclically operating valves or regenerators; with arrangements involving pressure pulsations

Abstract

A particulate trap unit has a housing defining a filter chamber and a back flush chamber. The filter chamber has a first inlet port and a first outlet port for facilitating a first fluid flow through the filter chamber. The back flush chamber has a second inlet port and a second outlet port for facilitating a second fluid flow through the back flush chamber. A particulate trap filter is positioned in the housing and extends into both the filter chamber and the back flush chamber.

Claims

1. A particulate trap unit for use in an EGR system, comprising:

a housing defining a filter chamber and a back flush chamber, said filter chamber having a first inlet port and a first outlet port for facilitating a first fluid flow through said filter chamber, said back flush chamber having a second inlet port and a second outlet port for facilitating a second fluid flow through said back flush chamber;

a shaft rotatably coupled to said housing; and

a particulate trap filter connected to said shaft for rotation with said shaft, said particulate trap filter being positioned in said housing and extending into both said filter chamber and said back flush chamber.

2. The particulate trap unit of claim 1, comprising a drive source coupled to said shaft to provide a rotational force for rotating said shaft, and in turn, for rotating said particulate trap filter.

3. The particulate trap unit of claim 1, wherein said particulate trap filter forms a porous structure having a plurality of passages that facilitate said first fluid flow between said first inlet port and said first outlet port, and that facilitate said second fluid flow between said second inlet port and said second outlet port.

4. The particulate trap unit of claim 3, wherein said plurality of passages are sized to trap particulate material that is present in EGR gases flowing through said particulate trap filter.

5. The particulate trap unit of claim 3, wherein said first fluid flow is directed in a first direction through said particulate trap filter and said second fluid flow is directed in a second direction through said particulate trap filter opposite to said first direction.

6. An internal combustion engine, comprising:

a block defining a plurality of combustion cylinders;

an intake manifold connected to said block for providing combustion air to each of said plurality of combustion cylinders;

an exhaust manifold connected to said block to receive combustion gases from said plurality of combustion cylinders;

a turbocharger having a turbine and a compressor, said turbine having an exhaust gas inlet port and an exhaust gas outlet port, said compressor having an air inlet port, an air outlet port, and a bleed port, said exhaust gas inlet port of said turbine being connected in fluid communication with said exhaust manifold, said air inlet port of said compressor being in fluid communication with the atmosphere, and said air outlet port being in fluid communication with said intake manifold;

an EGR valve having an EGR inlet and an EGR outlet, said EGR inlet being connected in fluid communication with said exhaust manifold; and

a particulate trap unit having a housing, a shaft and a particulate trap filter, said shaft being rotatably coupled to said housing and said particulate trap filter being connected to said shaft for rotation with said shaft, said housing defining a filter chamber and a back flush chamber, said particulate trap filter being positioned in said housing and extending into both said filter chamber and said back flush chamber, said filter chamber having an EGR gases inlet port coupled in fluid communication with said EGR outlet of said EGR valve and having an EGR gases outlet port coupled in fluid communication with said intake manifold, said back flush chamber having a bleed air inlet port and a particulate flush port, said bleed air inlet port being coupled in fluid communication with said bleed port of said compressor and said particulate flush port being coupled in fluid communication with said exhaust manifold.

7. The internal combustion engine of claim 6, comprising a drive source coupled to said shaft of said particulate trap unit to provide a rotational force for rotating said shaft, and in turn, for rotating said particulate trap filter.

8. The internal combustion engine of claim 6, wherein said particulate trap filter forms a porous structure having a plurality of passages that facilitate an EGR gases fluid flow between said EGR gases inlet port and said EGR gases outlet port, and that facilitate a compressed air fluid flow between said bleed air inlet port and said particulate flush port.

9. The internal combustion engine of claim 8, wherein said plurality of passages are sized to trap particulate material that is present in EGR gases flowing through said particulate trap filter.

10. The internal combustion engine of claim 8, wherein said EGR gases fluid flow is directed in a first direction through said particulate trap filter and said compressed air fluid flow is directed in a second direction through said particulate trap filter opposite to said first direction.

11. A method of filtering EGR gases, comprising the steps of:

providing a particulate trap unit having a filter chamber and a back flush chamber;

rotating a particulate trap filter through both of said filter chamber and said back flush chamber;

establishing an EGR gases flow through said filter chamber, and thus through a first portion of said particulate trap filter, in a first direction; and

establishing a compressed air flow through said back flush chamber, and thus through a second portion of said particulate trap filter, in a second direction, said second direction being a direction opposite to said first direction.

12. The method of claim 11, wherein said rotating step is performed by incrementally rotating said particulate trap filter.

13. The method of claim 11, wherein said rotating step is performed by continuously rotating said particulate trap filter.

14. The method of claim 11, wherein said establishing a compressed air flow step removes particulate material trapped in said particulate trap filter.

15. The method of claim 11, wherein heat is stored in said particulate trap filter during said establishing an EGR gases flow step and said stored heat is released during said establishing a compressed air flow step to generate a warmed compressed air flow, said method comprising the step of supplying said warmed compressed air flow to an exhaust manifold of an internal combustion engine.