EP0260031A1
Expired / Lapsed
EP
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Particulate trap regeneration system for an engine
Assignee: Honeywell International Inc
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Filing: 1987-08-27
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Granted: —
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Expires: 2007-08-27
Abstract
Abstract A diesel engine exhaust particulate trap and regeneration system for trapping and periodically burning the particulates in the engine exhaust. Collected particulates are burned in the trap (32) by increasing the trap temperature by using a back pressure valve (34) in the exhaust gas line (30) . A microprocessor (38), which receives engine operating parameters via various sensors, compares the sensed parameter valves with engine maps stored in its memory and opens or closes the valve (34) via an actuator in response thereto.
Inventors
- 👤 James A. Hardy
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 19:16
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/0235; F01N9/00; F01N9/002; F02; F02B; F02B37/00; F02B37/02; F02B37/025; F01N13/00; F01N13/08; F01N13/10; F01N13/107; F01N2260/00; F01N2260/14; F01N2390/00; F01N2390/02; F02B3/00; F02B3/06; F02D; F02D9/00; F02D9/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
91 words
A particulate trap regeneration system for an engine (12) including an exhaust gas conduit (28) arranged to discharge exhaust gas and an exhaust gas particulate trap (32) in the exhaust gas conduit (28), downstream of the engine (12) characterised by valve means (34) in the exhaust gas conduit (28) for increasing the temperature of the exhaust gas in the particulate trap and valve operating means including means for sensing selected engine operating parameters (68,70,72,74,76,78,82) and means for opening and closing (36,38) the valve means (34) in response to the sensed parameters.
Claim 2
Dependent Claim
91 words
A particulate trap regeneration system for an engine (12) including an exhaust gas conduit (28) arranged to discharge exhaust gas and an exhaust gas particulate trap (32) in the exhaust gas conduit (28), downstream of the engine (12) characterised by valve means (34) in the exhaust gas conduit (28) for increasing the temperature of the exhaust gas in the particulate trap and valve operating means including means for sensing selected engine operating parameters (68,70,72,74,76,78,82) and means for opening and closing (36,38) the valve means (34) in response to the sensed parameters.
Claim 3
Dependent Claim
93 words
A system as claimed in Claim 1 characterised in that the valve means comprises: a valve casing (42) defining a passage therethrough, a valve head (44), and pivot pins (45) on each side of the valve head (44) extending into the casing and pivotably supporting the valve head (44), the casing passage having cylindrical inlet and outlet sections and a generally rectangualarly shaped cross-sectional flow area within the valve, the valve head (44) being generally rectangularly shaped and sized to be pivotable within the casing (42) to open and close the casing passage.
Claim 4
Dependent Claim
45 words
A system as claimed in Claim 2 characterised in that the casing (42) includes a tapered section between the circular inlet section and the rectangularly shaped section and between the rectangular shaped section and the circular outlet section in order to provide vernier flow control.
Claim 5
Independent Claim
34 words
A system as claimed in any preceding claim characterised in that the valve means is a back pressure valve (34) located immediately upstream of the particulate trap (32) in the exhaust gas conduit (28).
Claim 6
Independent Claim
117 words
A system as claimed in any preceding claim characterised in that the valve operating means comprises a microprocessor (38), a pressure sensor (68) upstream of the trap, temperature sensors upstream and downstream of the trap (32), an engine rack position sensor (78), and an engine speed or RPM sensor (76), and the microprocessor (38) includes an engine map of loaded trap pressure vs. rack position for a range of engine speeds programmed into its memory, the microprocessor (38) being arranged to receive input signals from the pressure, temperature, engine speed or RPM, and rack position sensors and being arranged to compare the sensed parameters with the map of pressure vs. rack position for a given engine speed.
Claim 7
Independent Claim
138 words
A system as claimed in any of Claims 1 to 4 for use with a turbocharged engine characterised in that the valve operating means comprises: a microprocessor (38), a pressure sensor (68) upstream of the trap (32), temperature sensors (70,72) upstream and downstream of the trap (32), an air flow measurement device (74) upstream of the compressor (18) of the turbocharger and an engine speed sensor (76), and the microprocessor (38) includes an engine map of loaded trap pressure vs. air flow for a range of engine speeds programmed into its memory, the microprocessor (38) being arranged to receive input signals from the pressure, engine speed and temperature sensors, and from the air flow measurement device, and being arranged to compare the sensed parameters with the map of back pressure vs. air flow for a given engine speed.
Claim 8
Independent Claim
121 words
A system as claimed in any of Claims 1 to 4 characterised in that the valve operating means comprises: a microprocessor (38), temperature sensors (70,72) upstream and downstream of the trap (32), an air flow measurement device (74), a rack position sensor (78) and an engine speed sensor (76) and the microprocessor (38) includes an engine map of air flow vs. rack position for a range of engine speeds programmed into its memory, the microprocessor (38) being arranged to receive input signals from the temperature, ending speed and rack position sensors, and from the air flow measurement device, and being arranged to compare to the sensed parameters with the map of air flow vs. rack position for a given engine speed.
Claim 9
Independent Claim
23 words
A system as claimed in any preceding claim characterised by a manually operable signal (38) which overrides the signals from the various sensors.
Claim 10
Independent Claim
50 words
A method of controlling the temperature in a particulate trap regeneration system (32) in the exhaust gas conduit (28) of an engine (12) characterised by sensing selected engine operating parameters (68,70,72,74,76,78,82) and opening and closing valve means (34) in the exhaust gas conduit (28) in response to the sensed parameters.
Claim 11
Independent Claim
50 words
A method of controlling the temperature in a particulate trap regeneration system (32) in the exhaust gas conduit (28) of an engine (12) characterised by sensing selected engine operating parameters (68,70,72,74,76,78,82) and opening and closing valve means (34) in the exhaust gas conduit (28) in response to the sensed parameters.
Claim 12
Dependent Claim
95 words
A method as claimed in Claim 9 characterised by sensing the exhaust gas pressure (68) upstream of the valve means (34), engine speed (76), rack position (78) and exhaust gas temperature (70) upstream of the trap (32), comparing the sensed pressure with the pressure on an engine map of pressure vs. rack position for a range of engine speeds and inlet trap temperatures, and restricting exhaust gas flow into the trap (32) when the pressure is less than the map pressure and opening the valve means (34) when the pressure exceeds the corresponding map pressure.
Claim 13
Dependent Claim
114 words
A method as claimed in Claim 9 characterised by sensing the rack position (78), the air flow (74) upstream of the compressor (18) of a turbocharger used in the engine, the temperature (70) at the inlet to the trap (32) and the engine speed (76) calculating the air/fuel ratio, comparing the air/fuel ratio and air flow with a map of air/fuel ratio vs. air flow for a given engine speed, and closing the valve means (34) 20 when the air/fuel ratio exceeds the air/fuel ratio on the engine map for a given engine speed and rack position and opening the valve means (34) when the ratio is less than the ratio on the map.
Claim 14
Dependent Claim
44 words
A method as claimed in Claim 10 or Claim 11 characterised by the further steps of sensing the exhaust gas temperature (70) upstream of the trap (32) and regulating the position of the valve means (34) in order to maintain a constant inlet temperature.
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