GB2467949A - Apparatus for improving the operation of a particulate filter by heating - Google Patents

Apparatus for improving the operation of a particulate filter by heating Download PDF

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Publication number
GB2467949A
GB2467949A GB0902933A GB0902933A GB2467949A GB 2467949 A GB2467949 A GB 2467949A GB 0902933 A GB0902933 A GB 0902933A GB 0902933 A GB0902933 A GB 0902933A GB 2467949 A GB2467949 A GB 2467949A
Authority
GB
United Kingdom
Prior art keywords
particulate filter
heater element
internal combustion
combustion engine
timer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0902933A
Other versions
GB0902933D0 (en
Inventor
Clive Robert Rich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0902933A priority Critical patent/GB2467949A/en
Publication of GB0902933D0 publication Critical patent/GB0902933D0/en
Publication of GB2467949A publication Critical patent/GB2467949A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D41/00—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids
    • B01D41/04—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids of rigid self-supporting filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0086—Filter condition indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/4218—Influencing the heat transfer which act passively, e.g. isolations, heat sinks, cooling ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/4263—Means for active heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/80—Chemical processes for the removal of the retained particles, e.g. by burning
    • B01D46/84—Chemical processes for the removal of the retained particles, e.g. by burning by heating only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F01N13/143—Double-walled exhaust pipes or housings with air filling the space between both walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/30—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for treatment of exhaust gases from IC Engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0422—Methods of control or diagnosing measuring the elapsed time

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

Apparatus 2 for improving the operation of a particulate filter 4 of an internal combustion engine, which apparatus comprises a monitoring device 6 for monitoring the operation of the particulate filter, a heater element 8, timer 10 for controlling the length of operation of the heater element, and switch mechanism 12 for activating the heater element and the timer when the monitor device indicates that the particulate filter is not operating correctly, providing a timed injection of heat to the particulate filter in order to cause insufficiently burnt engine exhaust particles trapped in the particulate filter and blocking the particulate filter to re-burn to unblock the particulate filter. The apparatus may include a waterproof and weather proof insulation jacket. Preferably the switch mechanism can be manually or automatically operated, the timer is a solenoid-operated device and the monitor device conveys its results visually or audibly.

Description

APPARATUS FOR IMPROVING THE OPERATION OF
A PARTICULATE FILTER OF
AN INTERNAL COMBUSTION ENGINE
This invention relates to apparatus for improving the operation of a particulate filter of an internal combustion engine.
Particulate filters for internal combustion engines are well known. The particulate filters are most widely fitted on diesel engines of road vehicles. In congested traffic conditions, the working temperature at the exhaust manifold of the vehicle is often lower than that required to cause re-burning of insufficiently burnt engine fuel particles which are trapped in the particulate filter and which block the particulate filter. When such conditions exist, visual warning means in the form of a warning light or a bank of warning lights becomes illuminated on the vehicle dashboard. The driver of the vehicle is thus alerted to the fact that the particulate filter is not operating correctly due to driving in the congested traffic conditions. The driver then knows that he or she must adopt a different driving mode which involves a driving speed of approximately 50 -60 miles per hour for a distance of 40 -50 miles. This required driving mode is often not possible, for example if the vehicle still has to remain within the congested traffic zone, or if speed limits prevent the attainment of the required speed, or if the vehicle is fitted with devices such for example as tacometers which restrict driving speed and thus prevent the required speed being reached. In such circumstances, the particulate filter becomes increasingly blocked, with the result that exhaust emissions become increasingly severe. In the event of a filter blocking, the exhaust emissions will find other means of escape, often via seals that have blown.
It is an aim of the present invention to obviate or reduce the above mentioned problem.
Accordingly, in one non-limiting embodiment of the present invention there is provided apparatus for improving the operation of a particulate filter of an internal combustion engine, which apparatus comprises monitor means for monitoring the operation of the particulate filter, at least one heater element, timer means for controlling the length of operation of the heater element, and switch means for causing operation of the heater element and the timer means when the monitor means indicates that the particulate filter is not operating correctly, whereby in use the apparatus provides a timed injection of heat to the particulate filter in order to cause insufficiently burnt engine exhaust particles trapped in the particulate filter and blocking the particulate filter to re-burn and thereby unblock the particulate filter.
Usually, the internal combustion engine will be a diesel engine.
Preferably the diesel engine is a diesel engine for a road vehicle, for example a lorry, van, bus, coach or car. The diesel engine may however be for another type of vehicle such for example as a diesel engine taxi. The diesel engine may also be the diesel engine of static machinery plant, for example for providing power and/or electricity. The internal combustion engine may also be a petrol engine if desired. The apparatus of the present invention is able to provide a commercially cost-effective way of unblocking a particulate filter.
The apparatus is not designed to operate with a totally blocked particulate filter. The apparatus is designed to operate when the particulate filter is starting to block up, thereby preventing the particulate filter from completely blocking up.
Preferably, the apparatus of the present invention includes insulation means for reducing unwanted heat loss from the apparatus.
The insulation means is preferably an insulation jacket. Other types of insulation means may be employed.
Preferably, the insulation means is constructed to be waterproof and weatherproof. This is because the insulation means is usually fitted as an external component which is subjected to water, mud and the like when the internal combustion engine is operating during adverse weather conditions.
The switch means may be a manually operated switch means for being manually operated to cause the operation of the heater element and the timer means. The manually operated switch means may thus be operated by an operator of the internal combustion engine, for example a driver in the case of an internal combustion engine in a road vehicle.
Alternatively, the switch means may be an automatically operated switch means for causing automatic operation of the heater element and a timer means. In this case, the apparatus of the present invention may operate automatically consequent upon a particulate filter blocking situation occurring.
Preferably, there are four of the heater elements. More or less of the heater elements may be employed. The heater elements are such as to cause the burning of the insufficiently burnt engine exhaust particles caught in the particulate filter and blocking the particulate filter.
The timer means is preferably a solenoid-operated timer means. Other timer means may be employed, for example a solid state timer means.
The monitor means may be a visual andlor audible monitor means.
The monitor means will usually comprise a warning light or warning lights.
The or each warning light may be a light emitting diode.
The present invention also extends to the combination of the apparatus of the invention and a particulate filter of an internal combustion engine. In this case, the apparatus of the present invention is preferably provided in a pipe leading to the particulate filter. In road vehicles, the pipe will usually be a down pipe but the pipe may be a pipe extending in any suitable and appropriate direction. The combination may be one in which the said at least one heater element is positioned adjacent a front face of the particulate filter, whereby the timed injection of heat is applied to the front face of the particulate filter.
The present invention also extends to an internal combustion engine when provided with the combination of the apparatus of the invention and the particulate filter. As indicated above, the internal combustion engine is preferably a diesel engine.
An embodiment of the invention will now be described solely by way of example and with reference to the accompanying drawings in which: Figure 1 shows apparatus of the present invention for improving the operation of a particulate filter of an internal combustion engine; Figure 2 shows how the apparatus of Figure 1 is fitted with respect to a particulate filter in an internal combustion engine; Figure 3 shows part of the apparatus shown in Figure 2 additionally provided with insulation means; Figure 4 shows in more detail the down pipe part of the apparatus shown in Figure 1; Figure 5 is a section through one of the heating elements shown in Figure 4; Figure 6 is a top plan view of the heating elements shown in Figure 5; and Figure 7 shows a preferred monitor means.
Referring to Figures 1 -6, there is shown apparatus 2 for improving the operation of a particulate filter 4 of an internal combustion engine. The apparatus 2 comprises monitor means 6 for monitoring the operation of the particulate filter 4. The apparatus 2 further comprises four heater elements 8.
The apparatus 2 further comprises timer means 10 for controlling the length of operation of the heater elements 8. Switch means 12 is provided for causing operation of the heater elements 8 and the timer means 10 when the monitor means 6 indicates that the particulate filter 4 is not operating correctly. In use, the apparatus 2 provides a timed injection of heat to the particulate filter 4 in order to cause insufficiently burnt engine exhaust particles trapped in the particulate filter 4 and blocking the particulate filter 4 to re-burn and thereby unblock the particulate filter 4.
As shown in Figure 3, the apparatus 2 further includes insulation means in the form of an insulation jacket 14 for reducing unwanted heat loss from the apparatus 2. The insulation jacket 14 is constructed to be waterproof and weatherproof. The insulation jacket 14 has a tubular portion 16 extending around the particulate filter 4, and a frusto-conical portion 18 extending from a front face 20 of the particulate filter 4 and an adjacent front chamber 22 of a down pipe 24 to a portion 26 of the down pipe 24. The insulation jacket 14 thus insulates the heater elements 8 generating the heat, and also the particulate filter 4 receiving the heat. As shown in Figures 2 and 3, the particulate fitter 4 is held in position on the down pipe 24 by means of a clamp 28.
The switch means 12 is a manually operated switch means 12 in the form of a push button. The switch means 12 is pushed to cause operation of the heater elements 8 and the timer means 10. The timer means 10 is a solenoid-operated timer means 10. The illustrated timer means 10 is able to provide a heating period of six minutes for the heater elements 8. The electric current for the heater elements 8 is provided by a battery 30 of the vehicle.
The battery 30 will normally be the vehicle's normal battery but it could be a separate battery if desired.
As shown in Figure 1, the circuit for the apparatus 2 includes an earth 31, fuses 32, 34 and a dash warning light 36.
As shown in Figure 2, exhaust gases passing through the particulate filter 4 pass to an exhaust outlet tail part 38. Also shown in Figure 2 is a removable test plug 39 which provides for visual inspection and also pressure testing.
Figure 4 is a plan view showing how the four heater elements 8 are symmetrically fitted to the down pipe 24. As also shown in Figure 4, a lead 40 connects the four heater elements 8 together in order to provide current along a lead 42 connected to the battery 30 via the switch means 12 and a relay 44 shown in Figure 1. The relay 44 forms switch means which is under the control of the timer means 10. The relay 44 forms part of the timer means 10 so that when the time set by the timer means 10 lapses, the relay breaks the circuit and interrupts the passage of electrical current from the battery 30 to the heater elements 8.
As can be appreciated from Figures 5 and 6, the heater elements 8 are provided with a screw-threaded portion 46 enabling them to be screw-threaded into a housing 48 welded by a weld 50 to the down pipe 24. The heater elements 8 are positioned adjacent a front face 52 of the particulate filter 4, whereby the timed injection of heat is applied to the front face 52 of the particulate filter 4.
Referring now to Figure 7, there is shown a preferred monitor means 54 comprising a push button 56 which is one form of switch means 12 as shown in Figure 1. When the push button 56 is pushed, then the apparatus 2 becomes activated. A light 58 becomes illuminated to indicate that the apparatus 2 has been activated. The monitor means 54 makes use of existing warning means 60 which is used when particulate filters are fitted. The warning means 60 comprises a light 62 which changes colour as the particulate filter blocks, the light 62 going from green to amber to red, with green being when the filter is clear and red being when the particulate filter is blocked. The warning means 60 also has four lights 64. These lights 64 shown how full the particulate filter is, with all the lights 64 being green when the particulate filter is not blocked, with one light turning to blue when 25% of the particulate filter is blocked, with two lights 64 turning blue when 50% of the particulate filter is blocked, with three lights 64 turning blue when 75% of the particulate filter is blocked, and with all four lights 64 turning blue when 100% of the particulate filter is blocked. When all four lights 64 are showing blue, then this is an indication that the particulate filter 4 needs maintenance.
The maintenance is usually achieved by removing the particulate filter, baking it in an oven at a temperature of approximately 800°C. This process turns the soot into ash which is then removed before the filter is refitted.
With the monitor means 54, the apparatus 2 of the present invention uses only the light 62. This light 62 reads back pressure at the front face 52 of the particulate filter 4. When the light 62 is indicating amber or red, then the push button 56 is pushed to activate the apparatus 2. Preferably the push button 56 is pushed when the light 62 is showing amber rather than waiting until the light 62 is showing red. When the apparatus 2 is activated then soot at the front face of the particulate filter 4 is burnt off. Thus the apparatus 2 of the present invention is able to remove the blocking soot from the particulate filter 4 and especially its front face, thereby allowing the particulate filter 4 to continue operating effectively to trap the ash and thus improving the quality of the exhaust emissions.
The apparatus 2 is able to be operated by the driver of a diesel vehicle in order to prevent the particulate filter 4 from blocking up.
It is to be appreciated that the embodiment of the invention described above with reference to the accompanying drawings has been given by way of example only and that modifications may be effected. Thus, for example, the switch means 12 could be an automatic switch means causing the apparatus 2 to operate automatically consequent on the particulate filter 4 starting to block up and the vehicle needing to be driven at higher speeds for a set distance, for example at 50 -60 miles per hour for a distance of 40 -50 miles. More or less than four of the heather elements 8 may be employed.
The particulate filter 4 may be any suitable and appropriate filter 4. The apparatus 2 may be fitted on diesel engines other than road vehicle engines, and the apparatus 2 may also be fittedon petrol engines, including 4 stroke petrol engines and 2 stroke petrol engines.

Claims (16)

  1. CLAIMS1. Apparatus for improving the operation of a particulate filter of an internal combustion engine, which apparatus comprises monitor means for monitoring the operation of the particulate filter, at least one heater element, timer means for controlling the length of operation of the heater element, and switch means for causing operation of the heater element and the timer means when the monitor means indicates that the particulate filter is not operating correctly, whereby in use the apparatus provides a timed injection of heat to the particulate filter in order to cause insufficiently burnt engine exhaust particles trapped in the particulate filter and blocking the particulate filter to re-burn and thereby unblock the particulate filter.
  2. 2. Apparatus according to claim I and including insulation means for reducing unwanted heat loss from the apparatus.
  3. 3. Apparatus according to claim 2 in which the insulation means is an insulation jacket.
  4. 4. Apparatus according to claim 2 or claim 3 in which the insulation means is constructed to be waterproof and weatherproof.
  5. 5. Apparatus according to any one of the preceding claims in which the switch means is a manually operated switch means for being manually operated to cause the operation of the heater element and the timer means.
  6. 6. Apparatus according to any one of claims 1 -4 in which the switch means is an automatically operated switch means for causing automatic operation of the heater element and the timer means.
  7. 7. Apparatus according to any one of the preceding claims in which there are four of the heater elements.
  8. 8. Apparatus according to any one of the preceding claims in which the timer means is a solenoid-operated timer means.
  9. 9. Apparatus according to any one of the preceding claims in which the monitor means is a visual and/or audible monitor means.
  10. 10. Apparatus according to claim 9 in which the monitor means comprises a warning light or warning lights.
  11. 11. Apparatus for improving the operation of a particulate filter for an internal combustion engine, substantially as herein described with reference to the accompanying drawings.
  12. 12. The combination of the apparatus according to any one of the preceding claims and a particulate filter of an internal combustion engine.
  13. 13. The combination according to claim 12 in which the apparatus is provided in a pipe leading to the particulate filter.
  14. 14. The combination according to claim 12 or claim 13 in which the said at least one heater element is positioned adjacent a front face of the particulate filter, whereby the timed injection of heat is applied to the front face of the particulate filter.
  15. 15. An internal combustion engine when provided with the combination of any one of claims 12 -14.
  16. 16. An internal combustion engine according to claim 15 and which is a diesel engine.
GB0902933A 2009-02-20 2009-02-20 Apparatus for improving the operation of a particulate filter by heating Withdrawn GB2467949A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0902933A GB2467949A (en) 2009-02-20 2009-02-20 Apparatus for improving the operation of a particulate filter by heating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0902933A GB2467949A (en) 2009-02-20 2009-02-20 Apparatus for improving the operation of a particulate filter by heating

Publications (2)

Publication Number Publication Date
GB0902933D0 GB0902933D0 (en) 2009-04-08
GB2467949A true GB2467949A (en) 2010-08-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0902933A Withdrawn GB2467949A (en) 2009-02-20 2009-02-20 Apparatus for improving the operation of a particulate filter by heating

Country Status (1)

Country Link
GB (1) GB2467949A (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4485622A (en) * 1980-10-09 1984-12-04 Nippon Soken, Inc. Exhaust gas cleaning device for internal combustion engine
US4685290A (en) * 1984-11-19 1987-08-11 Nippon Soken, Inc. Engine control with function to eliminate minute particles in exhaust gas
GB2239407A (en) * 1989-12-27 1991-07-03 Nissan Motor I.C. Engine exhaust filter cleaning
EP0528289A1 (en) * 1991-08-09 1993-02-24 Nippon Soken, Inc. Device for catching and removing particulates for a diesel engine
EP0601287A2 (en) * 1992-09-09 1994-06-15 Matsushita Electric Industrial Co., Ltd. Apparatus for purifying exhaust gas of diesel engine
EP0632188A1 (en) * 1993-06-22 1995-01-04 Toyota Jidosha Kabushiki Kaisha Exhaust emission control device for diesel engine
US20070044460A1 (en) * 2005-08-23 2007-03-01 Gonze Eugene V Electrical diesel particulate filter (DPF) regeneration
WO2007050384A2 (en) * 2005-10-21 2007-05-03 Honeywell International Inc. System for particulate matter sensor signal processing
EP1854970A1 (en) * 2005-02-28 2007-11-14 Yanmar Co., Ltd. Exhaust emission control device and internal combustion engine equipped with the exhaust emission control device and particulate filter regenerating method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4485622A (en) * 1980-10-09 1984-12-04 Nippon Soken, Inc. Exhaust gas cleaning device for internal combustion engine
US4685290A (en) * 1984-11-19 1987-08-11 Nippon Soken, Inc. Engine control with function to eliminate minute particles in exhaust gas
GB2239407A (en) * 1989-12-27 1991-07-03 Nissan Motor I.C. Engine exhaust filter cleaning
EP0528289A1 (en) * 1991-08-09 1993-02-24 Nippon Soken, Inc. Device for catching and removing particulates for a diesel engine
EP0601287A2 (en) * 1992-09-09 1994-06-15 Matsushita Electric Industrial Co., Ltd. Apparatus for purifying exhaust gas of diesel engine
EP0632188A1 (en) * 1993-06-22 1995-01-04 Toyota Jidosha Kabushiki Kaisha Exhaust emission control device for diesel engine
EP1854970A1 (en) * 2005-02-28 2007-11-14 Yanmar Co., Ltd. Exhaust emission control device and internal combustion engine equipped with the exhaust emission control device and particulate filter regenerating method
US20070044460A1 (en) * 2005-08-23 2007-03-01 Gonze Eugene V Electrical diesel particulate filter (DPF) regeneration
WO2007050384A2 (en) * 2005-10-21 2007-05-03 Honeywell International Inc. System for particulate matter sensor signal processing

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