US5067973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and an apparatus for regenerating a diesel particulate exhaust filter
Assignee: Individual
•
Filing: 1990-03-23
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Granted: 1991-11-26
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Expires: 2010-03-23
Abstract
Abstract A method of and an apparatus for regenerating a diesel filter (1) mounted in the exhaust pipe (3) of a diesel engine (2) wherein for initiating regeneration, the exhaust flow is throttled in the exhaust pipe (3) and/or in an exhaust feedback passage (7) by means of a control unit (10) responsive to setpoint exhaust temperatures measured upstream and downstream of the diesel filter (1) in the exhaust pipe (3), and that the air ratio is set to a value between 1.2 and 1.3 to inhibit regeneration.
Inventors
- 👤 Konstatin N. Pattas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:17
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/021; F02D41/0235; F02D41/027; F02D41/029; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/0235; F01N9/00; F01N9/002; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1446; F01N2430/00; F01N2430/06; F02B; F02B3/00; F02B3/06; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0055; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
164 words
A method of regenerating a diesel particulate exhaust soot filter mounted in the exhaust pipe of a diesel engine, the exhaust being throttled upstream of the diesel filter, as viewed in flow direction, so that at least the regenerating temperature is reached, comprising the steps of: (a) measuring the actual temperature (T l and T h ) upstream and downstream of the diesel filter; (b) automatically initiating regeneration when a first setpoint exhaust temperature (T lmin ) is reached upstream of the diesel filter; (c) automatically turning off the regeneration when a second setpoint exhaust temperature (T lmax ) upstream of the diesel filter is exceeded; (d) preventing regeneration of the diesel filter by controlling the throttling when a predetermined third exhaust temperature (T hmax ) downsteram of the diesel filter is exceeded; and (e) varying said first, second and third setpoint exhaust temperatures (T lmin , T lmax , T hmax ) in response to the pressure drop (Δp) across the diesel filter.
Claim 2
Independent Claim
164 words
A method of regenerating a diesel particulate exhaust soot filter mounted in the exhaust pipe of a diesel engine, the exhaust being throttled upstream of the diesel filter, as viewed in flow direction, so that at least the regenerating temperature is reached, comprising the steps of: (a) measuring the actual temperature (T l and T h ) upstream and downstream of the diesel filter; (b) automatically initiating regeneration when a first setpoint exhaust temperature (T lmin ) is reached upstream of the diesel filter; (c) automatically turning off the regeneration when a second setpoint exhaust temperature (T lmax ) upstream of the diesel filter is exceeded; (d) preventing regeneration of the diesel filter by controlling the throttling when a predetermined third exhaust temperature (T hmax ) downsteram of the diesel filter is exceeded; and (e) varying said first, second and third setpoint exhaust temperatures (T lmin , T lmax , T hmax ) in response to the pressure drop (Δp) across the diesel filter.
Claim 3
Dependent Claim
42 words
The method as defined in claim 1, and further wherein regeneration of the diesel filter is inhibited by temporarily cutting the diesel filter out of the exhaust stream by passing the exhaust through a bypass passage (20) which bypasses the diesel filter.
Claim 4
Dependent Claim
31 words
The method as defined in claim 1, wherein the regeneration of the diesel filter is inhibited by setting the air ratio (lambda) to a setpoint within a range greater than 1.
Claim 5
Dependent Claim
43 words
The method as claimed in claim 3, characterized in that the air ratio is adjusted by controlled throttling of the exhaust in the exhaust pipe main stream upstream of the diesel filter and is verified by measuring the oxygen content in the exhaust.
Claim 6
Dependent Claim
35 words
The method as defined in claim 4 wherein the air ratio is adjusted to the setpoint by controlled throttling of an exhaust feedback flow and is verified by measuring the oxygen content in the exhaust.
Claim 7
Independent Claim
187 words
An apparatus for regenerating a diesel particulate exhaust soot filter mounted in the exhaust pipe of a diesel engine, in which a variable throttle device (4) is disposed in the exhaust pipe upstream of the diesel filter (1), as viewed in flow direction, characterized by a bypass passage (20) branching off from the exhaust pipe (3) upstream of the throttle device (4), as viewed in flow direction, and bypassing the diesel filter (1), with a check valve (21) disposed in said bypass passage, by temperature sensors (8, 9) for measuring the actual exhaust temperature (T l , T h ) in the exhaust pipe (3) upstream and downstream of the diesel filter (1), and by a control unit (10) to which the measured actual exhaust temperature (T l , T h ) and setpoint exhaust temperatures (T lmin , T lmax , T hmax ) are applied as inputs and which provides as outputs control signals for the throttle device (4) and the check valve (21) to open said check valve and to block the throttle device (4) to thereby inhibit regeneration of the diesel filter (1).
Claim 8
Independent Claim
187 words
An apparatus for regenerating a diesel particulate exhaust soot filter mounted in the exhaust pipe of a diesel engine, in which a variable throttle device (4) is disposed in the exhaust pipe upstream of the diesel filter (1), as viewed in flow direction, characterized by a bypass passage (20) branching off from the exhaust pipe (3) upstream of the throttle device (4), as viewed in flow direction, and bypassing the diesel filter (1), with a check valve (21) disposed in said bypass passage, by temperature sensors (8, 9) for measuring the actual exhaust temperature (T l , T h ) in the exhaust pipe (3) upstream and downstream of the diesel filter (1), and by a control unit (10) to which the measured actual exhaust temperature (T l , T h ) and setpoint exhaust temperatures (T lmin , T lmax , T hmax ) are applied as inputs and which provides as outputs control signals for the throttle device (4) and the check valve (21) to open said check valve and to block the throttle device (4) to thereby inhibit regeneration of the diesel filter (1).
Claim 9
Dependent Claim
57 words
Apparatus as defined in claim 6, and further including differential pressure sensor means (12) for measuring the pressure drop (Δp) in the exhaust across the diesel filter (1), and setpoint adjusting means (13) for adjusting said setpoint exhaust temperatures (T lmin , T lmax , T hmax ) as a function of said exhaust pressure drop (Δp).
Claim 10
Dependent Claim
190 words
Apparatus for regenerating a diesel particulate exhaust soot filter mounted on the exhaust pipe of a diesel engine, comprising: (a) a diesel particulate exhaust soot filter; (b) means (4) for throttling the exhaust upstream of the diesel filter, as viewed in the flow direction, so that at least the regenerating temperature is reached; (c) means (8,9) for measuring the actual exhaust temperatures (T l and T h ) upstream and downstream of the diesel filter; (d) function module means (13) for automatically initiating regeneration when a first setpoint exhaust temperature (T lmin ) is reached upstream of the diesel filter, and for automatically turning off the regeneration when a second setpoint exhaust temperature (T lmax ) upstream of the diesel filter is exceeded; (e) means (11,20) for controlling the throttling to prevent regeneration of the diesel filter when a predetermined third exhaust temperature (T max ) downstream of the diesel filter is exceeded; and (f) differential pressure responsive means (12) for varying said first, second and third setpoint exhaust temperatures (T lmin , T max , T hmax ) in response to the pressure drop (Δp) across the diesel filter.
Claim 11
Dependent Claim
190 words
Apparatus for regenerating a diesel particulate exhaust soot filter mounted on the exhaust pipe of a diesel engine, comprising: (a) a diesel particulate exhaust soot filter; (b) means (4) for throttling the exhaust upstream of the diesel filter, as viewed in the flow direction, so that at least the regenerating temperature is reached; (c) means (8,9) for measuring the actual exhaust temperatures (T l and T h ) upstream and downstream of the diesel filter; (d) function module means (13) for automatically initiating regeneration when a first setpoint exhaust temperature (T lmin ) is reached upstream of the diesel filter, and for automatically turning off the regeneration when a second setpoint exhaust temperature (T lmax ) upstream of the diesel filter is exceeded; (e) means (11,20) for controlling the throttling to prevent regeneration of the diesel filter when a predetermined third exhaust temperature (T max ) downstream of the diesel filter is exceeded; and (f) differential pressure responsive means (12) for varying said first, second and third setpoint exhaust temperatures (T lmin , T max , T hmax ) in response to the pressure drop (Δp) across the diesel filter.
Claim 12
Dependent Claim
46 words
Apparatus as defined in claim 8, and further including exhaust feedback means (7) having a variable throttle device (6) connected across said diesel engine, and control means responsive to the oxygen content of the exhaust gas adjacent the exhaust pipe for operating said variable throttle device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |