Diesel engine exhaust regenerable filter system

• US 5,388,400 A
• Filed: 12/30/1992
• Issued: 02/14/1995
• Est. Priority Date: 12/30/1992
• Status: Expired due to Term

• Current Assignee: Donaldson Company Incorporated
• Original Assignee: Donaldson Company Incorporated
• Inventors: Hoppenstedt, Bruce B., Steinbrueck, Edward A., Wagner, Wayne M., Fuchs, Ervin P.
• Primary Examiner(s): Hart, Douglas
• Application Number:
  US07/998,839
• Time in Patent Office: 776 Days
• Field of Search: 60/274, 60/286, 60/303, 55/283, 55/466, 55/DIG. 30
• US Class Current: 60/274
• CPC Class Codes: B01D 2279/30 for treatment of exhaust gases from IC Engines
• CPC Class Codes: B01D 46/0005 Mounting of filtering elements within casings, housings or frames B01D46/2422 takes precedence
• CPC Class Codes: B01D 46/0084 provided with safety means
• CPC Class Codes: B01D 46/24 Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
• CPC Class Codes: B01D 46/4263 Means for active heating or cooling
• CPC Class Codes: B01D 46/58 connected in parallel
• CPC Class Codes: F01N 3/0238 for regenerating during engine standstill
• CPC Class Codes: F01N 3/027 using electric or magnetic heating means
• CPC Class Codes: F01N 9/002 of filter regeneration, e.g. detection of clogging
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

Diesel engine exhaust filter system for off-road vehicles. The system has a trap device and controlling mechanism on the vehicle. An electrical power source and a combustion air source are off-board. The controlling mechanism monitors backpressure to determine when regeneration is required. The vehicle is parked at a regeneration station for connection to the air source and power source for regeneration, which is then controlled by the controlling mechanism on-board.

Claims

1. An exhaust filter system for a vehicle with a diesel engine, comprising:

a trap device including a filter installed in a housing, said trap device being mounted on said vehicle, said trap device for removing particulates from exhaust gases of said engine;

a regeneration arrangement for said trap device, said regeneration arrangement including a heater in close proximity to said filter in said housing, said arrangement further including means separate from said vehicle for providing electrical power to said heater for regeneration of said filter and means separate from said vehicle for providing combustion air for regeneration; and

means mounted on said vehicle for controlling said regeneration arrangement, said electrical power providing means including power source means and first means for connecting to one another said controlling means and said heater to said power source means, said power source means including transformer means for powering said heater and switching means for controlling said transformer means, said first connecting means including first and second mating members, said first member having a pair of first sockets in electrical continuity with said transformer means and a first plug in electrical continuity with said switching means, said second member having a pair of second plugs in electrical continuity with said heater and a second socket in electrical continuity with said controlling means.

2. The system in accordance with claim 1 wherein said first and second members include means for holding said plugs and sockets so that said first plug and second socket connect after and disconnect before said first sockets and second plugs connect and disconnect, respectively.

3. The system in accordance with claim 1 wherein said transformer means includes a transformer with a primary winding and a secondary winding, said primary winding having means for receiving at least eight different voltage levels so that it may be used in most areas of the world regardless of voltage levels available.

4. An exhaust filter system for a vehicle with a diesel engine, comprising:

a trap device including a filter installed in a housing, said trap device being mounted on said vehicle, said trap device for removing particulates from exhaust gases of said engine;

a regeneration arrangement for said trap device, said regeneration arrangement including a heater in close proximity to said filter in said housing, said arrangement further including means separate from said vehicle for providing electrical power to said heater for regeneration of said filter and means separate from said vehicle for providing combustion air for regeneration, said combustion air providing means including air source means and first means for connecting said air source means to said housing, said first connecting means including a check valve for preventing passage of exhaust gases from said housing to said air source means; and

means mounted on said vehicle for controlling said regeneration arrangement, said electrical power providing means including power source means and second means for connecting to one another said controlling means and said heater to said power source means, said controlling means including means for preventing said electrical power providing means and said combustion air providing means from operating while said engine is running.

5. A method for using an exhaust filter system for a vehicle with a diesel engine, said system including a trap device mounted on said vehicle, said system further having a regeneration arrangement and means mounted on said vehicle for controlling said regeneration arrangement, said method comprising the steps of:

running said engine;

sensing backpressure to said engine from said trap device and creating an associated electrical signal;

electrically filtering said electrical signal to create a filtered signal;

determining when a first ratio is greater than a first predetermined value, said first ratio being a first measured time said filtered signal is greater than a first predetermined level relative to a first predetermined time;

providing an indication that said trap device may be regenerated;

stopping said engine; and

regenerating said trap device.

6. The method in accordance with claim 5 wherein said trap device has a filter and said regeneration arrangement has a heater in close proximity to said filter, said regeneration arrangement further having means for providing electrical power to said heater and means for providing combustion air for regeneration, said regenerating step including the steps of:

heating said filter with said heater by directing with said controlling means electrical power to said heater from said electrical power providing means, said electrical power providing means being separate from said vehicle;

flowing from said combustion air providing means as directed by said controlling means combustion air passed said filter, said combustion air providing means being separate from said vehicle;

stopping the heating of said filter with said heater; and

stopping the flowing of said combustion air from said combustion air providing means passed said filter.

7. The method in accordance with claim 5 including following said determining step the step of providing with said controlling means a first indication that said trap device may be regenerated.

8. The method in accordance with claim 7 further including the steps of:

determining when a second ratio is greater than a second predetermined value, said second ratio being a second measured time said filtered signal is greater than a second predetermined level relative to a second predetermined time; and

providing a second indication that said trap device must be regenerated.

9. The method in accordance with claim 8 following said regenerating step the step of turning off the second indication.

10. The method in accordance with claim 5 including the step of stopping said regenerating when said engine is restarted.