Catalytic converter and cleaning system

• US 5,397,550 A
• Filed: 02/14/1994
• Issued: 03/14/1995
• Est. Priority Date: 02/14/1994
• Status: Expired due to Term

• Current Assignee: ESW Technologies, Inc. (Environmental Solutions Worldwide Inc.)
• Original Assignee: Robert R. Marino Jr
• Inventors: Marino, Robert R. Jr.
• Primary Examiner(s): Warden, Robert J.
• Assistant Examiner(s): Tran, Hien
• Application Number:
  US08/194,917
• Time in Patent Office: 393 Days
• Field of Search: 422/168, 422/173-174, 422/177-178, 423/212, 423/213.2, 423/215.5, 60/295, 60/303, 60/311, 60/274, 55/DIG. 10, 55/DIG. 30, 502/38, 502/34, 502/55-56
• US Class Current: 422/178
• CPC Class Codes: F01N 2250/02 filtering and catalytic conversion
• CPC Class Codes: F01N 3/023 using means for regenerating the filters, e.g. by burning trapped particles by electrically controlling the supply of combustible mixture or its constituents only F02D41/0235
• CPC Class Codes: F01N 3/28 Construction of catalytic reactors
• CPC Class Codes: F01N 3/2882 Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices combined with absorbents or adsorbents only F01N3/0814; combined with particulate filters F01N3/035
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y10S 55/10 Residue burned
• CPC Class Codes: Y10S 55/30 Exhaust treatment

Abstract

A ceramic exhaust trap regenerator provides a push-pull heat channeling method of transferring heat to and through the ceramic monolith with a flow of super-heated air. The application of heat is controlled by pulling the hot air through the monolith and away from the downstream side of the monolith through a vacuum hose. The regeneration process is started and completely controlled by an off-board mobile regeneration console with the engine off. The console is a wheeled cart with attachments that include an air heater, vacuum and positive pressure air pumps with attaching hoses, a temperature-actuated relay, a particulate filter, process timers, a heat exchanger, a cooling fan, and an electrical controller.

Claims

1. An apparatus for regenerating a filter trap used to collect particles from the exhaust gas of an internal combustion engine, comprising:

an outer casing containing a filter trap centrally located therein, said casing having entrance and exit ports, the entrance port connected to and receiving exhaust gas from an exhaust pipe of an internal combustion engine and the exit port connected to and discharging filtered exhaust gas into a tailpipe;

means for providing a flow of super-heated air to a point just upstream of the filter trap to ignite particulates contained therein; and

a vacuum pump connected to said casing just downstream of said filter trap to assist the flow of said super-heated air through the filter trap and to draw off said exhaust gas.

2. The filter trap regenerating apparatus of claim 1, further including a vacuum air hose which is detachably connected between said vacuum pump and an outside of the casing just downstream of said filter trap.

3. The filter trap regenerating apparatus of claim 2, wherein said means for providing a flow of super-heated air to said filter trap comprises an air delivery hose detachably connected to the outside of the casing just upstream of said filter trap.

4. The filter trap regenerating apparatus of claim 3, further including a transversally extending air channeling tube affixed to an inside of said casing just upstream of said filter trap and connected to said air delivery hose, said tube including ports facing said filter trap for directing said super-heated air thereto.

5. The filter trap regenerating apparatus of claim 4, further including a vacuum probe affixed to said casing in fluid communication with said vacuum air hose and extending inside of said casing just downstream of said filter trap.

6. The filter trap regenerating apparatus of claim 5, wherein said filter trap is a ceramic monolith having a honeycomb structure.

7. The filter trap regenerating apparatus of claim 6, further including means for measuring pressure within said casing at points just upstream of, and just downstream of, said filter trap.

8. The filter trap regenerating apparatus of claim 7, further including a tailpipe valve for closing off airflow through said tailpipe downstream of said vacuum probe.

9. The filter trap regenerating apparatus of claim 8, further including a regeneration console detachably connected to said filter trap casing by said air delivery hose and said vacuum air hose, said console containing an air pump connected to said air delivery hose for providing super-heated air to said filter trap, and further including said vacuum pump for drawing the exhaust gas from a downstream side of said filter trap.

10. The filter trap regenerating apparatus of claim 9, further including an air-heating element affixed to an end of said air delivery hose adjacent to said casing for heating the flow of air through said air delivery hose to a temperature of at least 1,000 degrees F.

11. The filter trap regenerating apparatus of claim 10, wherein said air and vacuum pump within said console are controlled by a timer switch which interrupts an electrical supply to said pumps to limit operating to said pumps to a preset time.

12. The filter trap regenerating apparatus of claim 11, further including a controller interconnecting a temperature sensor on said filter trap, said air pumps, said timer switch and said heating element to control the heat within said filter trap.

13. The filter trap regenerating apparatus of claim 12, wherein said temperature sensor is located centrally within said filter trap which signals said controller.

14. The filter trap regenerating apparatus of claim 13, further including means within said console for cooling and filtering said vacuum hose airflow upstream of said vacuum pump.

15. The filter trap regenerating apparatus of claim 14, wherein said console is carried on a wheeled cart.

16. The filter trap regenerating apparatus of claim 15, wherein said hoses are flexible.

17. A method for regenerating a filter trap used to collect particles from the exhaust gas of an internal combustion engine comprising:

providing an outer casing containing a filter trap centrally located therein, said casing having entrance and exit ports, the entrance port connected to and receiving exhaust gas from an exhaust pipe of an internal combustion engine and the exit port connected to and discharging filtered exhaust gas into a tailpipe;

providing a flow of super-heated air to a point just upstream of the filter trap to ignite particulates contained therein; and

applying a vacuum just downstream of said filter trap with a vacuum pump to assist the flow of super-heated air through the filter trap and to draw off said exhaust gas.