EP0496487A1 - Système de commande des émissions - Google Patents

Système de commande des émissions Download PDF

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Publication number
EP0496487A1
EP0496487A1 EP92300045A EP92300045A EP0496487A1 EP 0496487 A1 EP0496487 A1 EP 0496487A1 EP 92300045 A EP92300045 A EP 92300045A EP 92300045 A EP92300045 A EP 92300045A EP 0496487 A1 EP0496487 A1 EP 0496487A1
Authority
EP
European Patent Office
Prior art keywords
valve
gas flow
exhaust manifold
exhaust
flow control
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.)
Granted
Application number
EP92300045A
Other languages
German (de)
English (en)
Other versions
EP0496487B1 (fr
Inventor
Keith Ransom
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.)
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
Original Assignee
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
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 Ford Werke GmbH, Ford France SA, Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Werke GmbH
Publication of EP0496487A1 publication Critical patent/EP0496487A1/fr
Application granted granted Critical
Publication of EP0496487B1 publication Critical patent/EP0496487B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • F01N3/227—Control of additional air supply only, e.g. using by-passes or variable air pump drives using pneumatically operated valves, e.g. membrane valves
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves
    • F02M26/57—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves using electronic means, e.g. electromagnetic valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
    • F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates

Definitions

  • the present invention relates to emission control systems for internal combustion engines.
  • valve means is provided to control the rate of flow of exhaust gases to the inlet manifold.
  • the valve means may be driven by a vacuum actuator, an electronic control module controlling an electronic vacuum regulator to control the vacuum actuator.
  • the engine exhaust system may also be fitted with a catalytic convertor to further reduce pollutants in the exhaust gases.
  • air may be pumped to the exhaust manifold, to react with the exhaust gases to preheat the catalyst.
  • air is pumped into the exhaust manifold for several minutes after starting the engine and must then be shut down quickly.
  • the amount of air mixed with the exhaust gases is critical, too little air prolonging the warming up period and too much air over heating the catalyst so that there is a risk it will melt.
  • As the volume of exhaust gases will depend upon the engine speed, it is desirable that the flow of air to the exhaust manifold is modulated to maintain optimum proportions of air and exhaust gases at all engine speeds.
  • GB 2,002,548B discloses an internal combustion engine with both exhaust recirculation and secondary air systems in which each system is controlled by a separate gas flow control valve.
  • the gas flow control valves are driven by pressure differential from independently regulatable sources and while under common electrical control, it is possible for both valves to be open at the same time thus permitting the secondary air to be fed back to the inlet manifold, which will result in lean running of the engine with possible damage to the engine.
  • an emission control system for an internal combustion engine having an inlet manifold, an exhaust manifold and an exhaust system including a catalytic converter comprises; a connection between the exhaust manifold and inlet manifold for recirculating exhaust gases from the exhaust manifold to the inlet manifold, a first gas flow control valve being provided to control flow of exhaust gases from the exhaust manifold to the inlet manifold; a connection to the exhaust manifold by which air may be supplied to the exhaust manifold, a second gas flow control valve being provided to control flow of air to the exhaust manifold, the first and second gas flow control valves each being driven by a fluid pressure differential actuator; characterised in that a common regulatable pressure source is adapted to selectively drive either the first gas flow control valve or the second gas flow control valve.
  • Using a common regulatable pressure source to drive both valves in accordance with the present invention will prevent both valves opening at the same time, thus avoiding the risk of damage to the engine due to lean running.
  • the present invention will also avoid duplication of the pressure regulating device with consequent reduction in cost and the number of components that can malfunction.
  • Figure 1 illustrates diagrammatically an engine 10 with inlet manifold 11 and exhaust manifold 12.
  • An exhaust system including a catalytic converter 13 is connected to the exhaust manifold 12.
  • the exhaust manifold 12 is connected to the inlet manifold 11 via a first gas flow control valve 14 by which a regulated proportion of the exhaust gases leaving the engine 10 via the exhaust manifold 12 may be recirculated via the inlet manifold 11.
  • An air pump 15 is connected to the exhaust manifold 12 via a second gas flow control valve 16, by which a regulated volume of air may be pumped to the exhaust manifold 12.
  • the first gas flow control valve 14 has a valve housing 50 which defines a cylindrical valve chamber 51 having an outlet 52 and inlet 53.
  • the valve chamber 12 defines a valve seat 54, the valve chamber 51 increasing in diameter from the valve seat 54 to the outlet 52.
  • a valve member 56 is located coaxially of the valve chamber 51, a valve stem 57 being slidably mounted in a bearing 58 mounted at the end of the valve chamber 51 remote from the inlet 53.
  • a valve head 59 is located at the end of valve stem 57 adjacent to seat 54 so that the valve member 56 may be moved between a position in which the valve head 59 engages and closes the valve seat 54 and a position in which the valve head 59 is spaced axially away from the valve seat 54 towards the outlet 52.
  • a cylindrical gas-tight casing 60 is bolted to the valve housing 50 coaxially of the valve chamber 51.
  • the end of the valve stem 57 remote from valve head 59 extends into the casing 60.
  • the casing 60 is formed from two parts 61 and 62 which are clamped together in suitable manner.
  • a flexible annular diaphragm 65 is mounted within the cylindrical casing 60, an outer peripheral bead portion 66 being clamped between parts 61 and 62 of casing 60, to provide a gas-tight seal therebetween.
  • the inner periphery 67 of diaphragm 65 is secured to a plate 68 which is mounted on and secured to the end of valve stem 57.
  • the diaphragm 65 thereby divides the casing 60 into two gas-tight compartments 70 and 71.
  • a port 72 is provided through part 61 of casing 60 to connect compartment 70 to atmosphere, and a port 73 is provided in part 62 of casing 60 by means of which compartment 71 may be connected to a controllable vacuum source.
  • a helical compression spring 75 acts between the end of casing 60 remote from valve seat 54 and the plate 68, to apply a load to the valve stem 57 urging the valve head 59 into engagement with valve seat 54.
  • the second gas flow control valve 16 as illustrated in Figure 3, comprises a valve housing 111 of similar construction to that of valve 14.
  • the valve housing 111 defines a cylindrical valve chamber 112 having an inlet 114 and outlet 115.
  • the valve chamber 112 defines a valve seat 113, the valve chamber 112 increasing in diameter from the valve seat 113 towards the inlet 114.
  • a valve member 116 is located coaxially of the valve chamber 112, a valve stem 117 being slidably mounted in bearing 118 mounted at the end of valve chamber 112 remote from outlet 115.
  • a valve head 119 is located at the end of valve stem 117 adjacent to seat 113, so that the valve member 116 may be moved between a position in which the valve head 119 engages and closes the valve seat 113 and a position in which the valve head 119 is spaced axially away from the valve 113 towards inlet 114.
  • a cylindrical gas-tight casing 120 is bolted to the valve housing 111 coaxially of the valve chamber 112.
  • the end of the valve stem 117 remote from valve head 119 extends into casing 120.
  • the casing 120 is formed from two parts 122 and 123, which are clamped together in suitable manner.
  • a flexible annular diaphragm 125 is mounted within the casing 120, an outer peripheral bead portion 126 being clamped between parts 122 and 123 of casing 120, to provide a gas-tight seal therebetween.
  • the inner periphery 127 of diaphragm 125 is secured to the valve stem 119 at an axially fixed position. The diaphragm 125 thereby divides the casing 120 into two gas-tight compartments 130 and 131.
  • Compartment 130 is connected to the inlet 114 by means of a bore 132 passing through the housing 111 and casing 120 and compartment 131 is connected via inlet 133, pressure tube 134 and bore 135 to the valve chamber 112 on the side of the seat 113 adjacent to the outlet 115.
  • a second cylindrical gas-tight casing 140 is bolted to casing 120 with sealing means 141 and a bearing 142 therebetween.
  • An extension 143 is secured to the end of valve stem 117 in suitable manner and extends through the bearing 142 into casing 140.
  • the casing 140 is formed from two parts 144 and 145, in similar manner to casing 120.
  • the outer periphery 147 of a second diaphragm 146 is clamped between parts 144 and 145 of casing 140.
  • the inner periphery 148 of diaphragm 146 is secured to a plunger 149 located coaxially within the casing 140.
  • a helical compression spring 150 acts between the end of casing 140 remote from valve housing 111 and the plunger 149, to urge the plunger 149 into engagement with an abutment 151 on the end of the extension 143 of valve stem 117, thus applying a load to valve stem 117 which will urge the valve head 119 into engagement with the valve seat 113.
  • the diaphragm 146 thereby divides the casing 140 into two gas-tight compartments 152 and 153.
  • a port 154 is provided in the wall of part 144 of casing 140 by which compartment 152 is connected to atmosphere and a port 155 is provided in part 145 of casing 140 by which compartment 153 may be connected to a controllable vacuum source.
  • Compartments 71 and 153 of valves 14 and 16 respectively are connected by ports 73 and 155, via a vacuum diverter solenoid 20, to an electronic vacuum regulator 21.
  • the vacuum diverter solenoid 20 under the control of an electronic control module 22, will selectively connect one of the compartments 71, 153 to the electronic vacuum regulator 21 while connecting the other compartment 153, 71 to atmosphere.
  • the electronic vacuum regulator 21 under control of the electronic control module 22, selectively connects the compartment 71, 153 connected thereto, to a source of vacuum or to atmosphere, to regulate the pressure within the compartment 71, 153.
  • the electronic control module 22 includes an input circuit 25 for processing signals from sensors 26 to 29, which measure, for example, engine load, engine speed, engine operating temperature and catalyst operating temperature.
  • the signals from the sensors 26 to 29 are processed and depending on the parameters measured, the electronic control unit 22 will energise either a secondary air circuit 31 or an exhaust recirculation circuit 32.
  • the electronic control unit 22 When the engine is first started and the catalytic converter 13 is cold, the electronic control unit 22 will actuate the secondary air circuit 31.
  • the secondary air circuit 31 will switch on the air pump 15 and switch the vacuum diverter solenoid 20, to connect compartment 153 of valve 16 to the electronic vacuum regulator 21 and compartment 71 of valve 14 to atmosphere.
  • valve 14 With chambers 70 and 71 of valve 14 connected to atmosphere, the spring 75 will maintain valve head 59 in engagement with the valve seat 54, so that the valve 14 will be closed preventing recirculation of exhaust gases.
  • the air pump 15 will deliver air under pressure to the inlet 114 of valve 16.
  • the pressure differential across the diaphragm 125 will apply a load to the valve stem 117, urging valve member 116 upwardly against the load applied by spring 150.
  • the electronic vacuum regulator 21 will connect chamber 153 to the source of vacuum producing a pressure differential across diaphragm 146 applying an upward load on plunger 149, this upward load opposing the downward load applied by spring 150.
  • valve 116 When the loads applied to the valve member 116 by the pressure differential across diaphragm 115 and to the plunger 149 by the pressure differential across diaphragm 146 are in excess of the load applied by the spring 150, the valve 116 will move upwardly opening the valve seat 113 and permitting air to flow from inlet 114 through outlet 115 to the exhaust manifold 12. Because of the varying diameter of the valve chamber 112 the area of the opening between inlet 114 and outlet 115 will depend upon the axial movement of the valve member 116. This may be controlled by controlling the strength of the vacuum in compartment 153 which is achieved by means of the electronic vacuum regulator 21 by switching between vacuum and atmosphere under the control of the electronic control module 22. The degree of opening of valve 16 may thus be controlled to control the proportion of air mixed with the exhaust gases, so that the warming up period of the catalytic converter 13 may be optimised.
  • the pressure in compartment 131 will then be in excess of that in compartment 130 and the pressure differential across the diaphragm 125 will move the valve member 116 downwardly, so that the valve head 119 will engage and close the valve seat 113, thereby preventing exhaust gases from being fed back to the pump 15.
  • the pressure at the inlet 114 will fall below the pressure at the outlet 115 so that the pressure differential across diaphragm 125 will again close the valve 16 irrespective of the state of the electronic vacuum regulator 21.
  • the electronic control module 22 When the catalytic converter 13 has reached its optimum operating temperature, the electronic control module 22 will switch off the secondary air circuit 31 which in turn will de-energise the air pump 15 and will switch the vacuum diverter solenoid so that chamber 71 of valve 14 is connected to the electronic vacuum regulator while chamber 153 of valve 16 is connected to atmosphere.
  • valve 16 Connection of chamber 153 of valve 16 to atmosphere will remove the pressure differential across diaphragm 146 re-applying the full load of spring 150 to valve member 116, thus ensuring that the valve 16 remains closed.
  • the exhaust gas recirculation circuit 32 will control the electronic vacuum regulator 21 to create a vacuum in compartment 71 of valve 14. Reduction of pressure in compartment 71 of valve 14 will create a pressure differential across diaphragm 65 which will oppose the load applied to the valve member 56 by spring 75, thus moving the valve member 56 upwardly and opening the valve seat 54.
  • the axial movement of the valve member 56 and consequently the rate of flow of gases through the valve 14 may be controlled in similar manner to the valve 16, by means of the electronic vacuum regulator 21, so that the proportion of exhaust gas that is recirculated may be controlled in accordance with the operating conditions of the engine.
  • a pressure differential transducer 35 measures the pressure across a restriction 36 in the connection between the exhaust manifold 12 and valve 14. This pressure differential transducer 35 provides a signal to a feedback circuit 37 in the electronic control module 22, which will cause the electronic vacuum regulator 21 to connect compartment 71 to atmosphere, shutting valve 14, if the pressure on the downstream side of the restriction 36 falls below that on the upstream side, which would result if pressure in the exhaust manifold 12 fell below that in the inlet manifold 11.
  • valves 14 and 16 may be driven by pressure actuators, for example by connecting chambers 70 and 152 to a regulatable source of fluid under pressure and chambers 71 and 153 to atmosphere or drain.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Exhaust Gas After Treatment (AREA)
EP92300045A 1991-01-19 1992-01-03 Système de commande des émissions Expired - Lifetime EP0496487B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9101249 1991-01-19
GB9101249A GB2251890A (en) 1991-01-19 1991-01-19 I.c. engine exhaust emission control

Publications (2)

Publication Number Publication Date
EP0496487A1 true EP0496487A1 (fr) 1992-07-29
EP0496487B1 EP0496487B1 (fr) 1995-06-28

Family

ID=10688750

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92300045A Expired - Lifetime EP0496487B1 (fr) 1991-01-19 1992-01-03 Système de commande des émissions

Country Status (3)

Country Link
EP (1) EP0496487B1 (fr)
DE (1) DE69203100T2 (fr)
GB (1) GB2251890A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0574181A1 (fr) * 1992-06-12 1993-12-15 Ford Motor Company Limited Moteur à combustion interne avec circuit d'air secondaire et circuit de recirculation de gaz d'échappement
EP0926334A3 (fr) * 1997-12-24 2000-05-03 Mannesmann VDO Aktiengesellschaft Dispositif de recirculation de gaz d'échappement et pour préchauffer un purificateur de gaz d'échappement
WO2000031402A1 (fr) * 1998-11-25 2000-06-02 Siemens Canada Limited Integration de capteur, actionneur, et soupape de regulation dans un module de regulation d'emission
US6116224A (en) * 1998-05-26 2000-09-12 Siemens Canada Ltd. Automotive vehicle having a novel exhaust gas recirculation module
US6138652A (en) * 1998-05-26 2000-10-31 Siemens Canada Limited Method of making an automotive emission control module having fluid-power-operated actuator, fluid pressure regulator valve, and sensor
US6170476B1 (en) 1998-05-26 2001-01-09 Siemens Canada Ltd. Internal sensing passage in an exhaust gas recirculation module
US6230694B1 (en) 1998-05-26 2001-05-15 Siemens Canada, Ltd. Calibration and testing of an automotive emission control module

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020116957B3 (de) 2020-06-26 2021-11-11 Pierburg Gmbh Luftzufuhrregelventil für einen Verbrennungsmotor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992878A (en) * 1975-10-03 1976-11-23 Ford Motor Company Engine secondary air flow control system
US4149377A (en) * 1976-05-24 1979-04-17 Nissan Motor Company, Limited Internal combustion engine with emission control systems
US4202173A (en) * 1978-03-22 1980-05-13 Toyota Jidosha Kogyo Kabushiki Kaisha Secondary air supplying device of an internal combustion engine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5028563B1 (fr) * 1969-12-29 1975-09-17
US3757521A (en) * 1971-04-05 1973-09-11 Chemical Construction Corp Integrated engine exhaust emission control system
JPS5232017B2 (fr) * 1972-11-30 1977-08-18
IT996383B (it) * 1973-05-10 1975-12-10 Pierburg Kg A Dispositivo di comando per il ritor no di gas di scarico nelle condut ture di aspirazione di un motore a combustione interna
US3950943A (en) * 1974-05-20 1976-04-20 General Motors Corporation Air diverter valve
JPS5430319A (en) * 1977-08-10 1979-03-06 Nissan Motor Co Ltd Electronic control internal combustion engine
US4342194A (en) * 1980-10-01 1982-08-03 General Motors Corporation Electric air control switching valve
JPS57171016A (en) * 1981-04-11 1982-10-21 Fuji Heavy Ind Ltd Controlling device for supplying secondary air in internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992878A (en) * 1975-10-03 1976-11-23 Ford Motor Company Engine secondary air flow control system
US4149377A (en) * 1976-05-24 1979-04-17 Nissan Motor Company, Limited Internal combustion engine with emission control systems
US4202173A (en) * 1978-03-22 1980-05-13 Toyota Jidosha Kogyo Kabushiki Kaisha Secondary air supplying device of an internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 372 (M-544)(2429) 11 December 1986 & JP-A-61 164 046 ( NISSAN MOTOR COMPANY LTD. ) 24 July 1986 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0574181A1 (fr) * 1992-06-12 1993-12-15 Ford Motor Company Limited Moteur à combustion interne avec circuit d'air secondaire et circuit de recirculation de gaz d'échappement
EP0926334A3 (fr) * 1997-12-24 2000-05-03 Mannesmann VDO Aktiengesellschaft Dispositif de recirculation de gaz d'échappement et pour préchauffer un purificateur de gaz d'échappement
US6116224A (en) * 1998-05-26 2000-09-12 Siemens Canada Ltd. Automotive vehicle having a novel exhaust gas recirculation module
US6138652A (en) * 1998-05-26 2000-10-31 Siemens Canada Limited Method of making an automotive emission control module having fluid-power-operated actuator, fluid pressure regulator valve, and sensor
US6170476B1 (en) 1998-05-26 2001-01-09 Siemens Canada Ltd. Internal sensing passage in an exhaust gas recirculation module
US6230694B1 (en) 1998-05-26 2001-05-15 Siemens Canada, Ltd. Calibration and testing of an automotive emission control module
WO2000031402A1 (fr) * 1998-11-25 2000-06-02 Siemens Canada Limited Integration de capteur, actionneur, et soupape de regulation dans un module de regulation d'emission

Also Published As

Publication number Publication date
DE69203100T2 (de) 1995-11-23
EP0496487B1 (fr) 1995-06-28
DE69203100D1 (de) 1995-08-03
GB9101249D0 (en) 1991-02-27
GB2251890A (en) 1992-07-22

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