WO1988008928A1 - Remise en circulation de gaz d'echappement - Google Patents

Remise en circulation de gaz d'echappement Download PDF

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Publication number
WO1988008928A1
WO1988008928A1 PCT/GB1988/000363 GB8800363W WO8808928A1 WO 1988008928 A1 WO1988008928 A1 WO 1988008928A1 GB 8800363 W GB8800363 W GB 8800363W WO 8808928 A1 WO8808928 A1 WO 8808928A1
Authority
WO
WIPO (PCT)
Prior art keywords
vacuum
egr
valve
restriction
regulator
Prior art date
Application number
PCT/GB1988/000363
Other languages
English (en)
Inventor
Keith Charles Ransom
Original Assignee
Ford Motor Company Limited
Ford Werke A.G.
Ford France S.A.
Ford Motor Company
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 Motor Company Limited, Ford Werke A.G., Ford France S.A., Ford Motor Company filed Critical Ford Motor Company Limited
Publication of WO1988008928A1 publication Critical patent/WO1988008928A1/fr

Links

Classifications

    • 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
    • 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

Definitions

  • This invention relates to exhaust gas recirculation for internal combustion engines.
  • Exhaust gas recirculation is a known technique which is of significant importance in reducing undesirable emissions from internal combustion engines.
  • a proportion of the exhaust gas is recirculated through a passage to the intake side of the engine, and mixed with the incoming air or fuel/air mixture.
  • EGR exhaust gas recirculation
  • an exhaust gas recirculation system for an internal combustion engine which has an intake manifold, an exhaust manifold, an EGR passage between the two manifolds and a vacuum operated EGR valve for controlling exhaust gas flow through the passage, wherein the passage contains a flow restriction upstream of the EGR valve, and wherein a vacuum regulator for providing a vacuum signal to operate the EGR valve is connected across the restriction, the vacuum regulator being connected to a vacuum supply and receiving control inputs from both sides of the restriction, from atmosphere and from a vacuum source controlled in accordance with predetermined relationships between engine operating parameters.
  • the vacuum source is preferably derived from the intake manifold vacuum modified by an electronic vacuum regulator controlled from an engine management module.
  • FIG. 1 is a schematic diagram of an EGR system in accordance with the invention.
  • Figure 2 shows a section through a vacuum regulator for use in the system of Figure 1.
  • FIG. 1 the intake manifold of an engine (not shown) is designated 10 and the exhaust manifold is designated 12.
  • An EGR passage 14 is connected between the two manifolds, and an EGR valve 16 is fitted in the passage 14 to control gas flow through the passage.
  • the EGR valve 16 is a vacuum controlled valve and receives a vacuum control signal from a line 18.
  • the vacuum appearing in line 18 is set by a vacuum regulator 20.
  • the regulator itself is shown in more detail in Figure 2, but Figure 1 shows that the regulator has connections 22 and 24 to the EGR passage 14 at opposite sides of a restriction 26 in the passage; connection 28 to the intake manifold, being a vacuum supply; connection 30 to an electronic vacuum regulator 32 and a connection 34 to atmosphere.
  • the electronic regulator 32 receives intake manifold vacuum from a line 33, and modifies this in accordance with an electrical control signal on a line 35, to produce a regulated vacuum supplied along the line 30 to the regulator 20.
  • a valve member 36 shuttles between two valve seats 38 and 40.
  • the valve member is supported between two diaphragms 42 and 44 , and a compression spring 46 provides a continually present biasing force acting on the diaphragm/valve member assembly.
  • a programmed electronic control circuit (or module) 37 which receives engine management signals relating to engine speed 39 and load 41 and which outputs an EGR setting signal to the electronic regulator 32. There is however no feedback from the EGR system itself to the module 37, which is therefore in an "open loop" situation.
  • the fact that the module only has to be programmed with predetermined speed/load data, and does not need to be capable of interpreting feedback data from the EGR system itself means that the module 37 can be considerably less complex than might otherwise be necessary.
  • the function of the regulator 20 is to provide a suitable vacuum signal to produce the correct flow in the EGR passage by varying the opening of the EGR valve 16.
  • the source vacuum from the intake manifold (line 28) is suitably regulated to give a value such that a given pressure drop is obtained for a given vacuum in line 30.
  • the source vacuum is introduced into a chamber 48 in the regulator through connection 28. With the valve member 36 in its middle position, there is communication between the source (through 28) , the valve (through 18) and atmosphere (through 34) . If the valve member 36 is in its uppermost position as shown in Figure 2, the source will be closed off and the valve will be held at atmospheric pressure. At the other extreme, the valve member will close against the seat 38 and then the valve 16 will be supplied with full supply vacuum.
  • valve member will shuttle between these two extreme positions and will be controlled by the pressure difference AP between the pressures in the lines 22 and 24 together with the biasing force of the spring 46 acting in one direction, and the vacuum from the electronic regulator 32 through connection 30 acting in the opposite direction.
  • the value of AP will clearly vary in accordance with the flow rate through the passage 14, and thus the opening of the valve 16 is also controlled, not only by the predetermined parameters in the module 37, but also by the instantaneous conditions in the passage 14.
  • the EGR system described can be easily calibrated because the (implied) required flow for any engine condition can be set in the module 37, i.e. it does not rely on knowledge of conditions at which the valve operates.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

Un système de remise en circulation de gaz d'échappement comprend une soupape (16) commandée par des pressions et placée dans le passage de remise en circulation (14). La source de vide servant à faire fonctionner la soupape provient du collecteur d'admission (10) et est régulée par [a] un signal de vide modifié (30) fourni par un régulateur électronique à depression (32) fonctionnant en circuit fermé et [b] des signaux de pression captés depuis les côtés opposés d'un étranglement (26) placé dans le passage de remise en circulation.
PCT/GB1988/000363 1987-05-12 1988-05-11 Remise en circulation de gaz d'echappement WO1988008928A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08711170A GB2204915A (en) 1987-05-12 1987-05-12 I.c. engine exhaust gas recirculation control
GB8711170 1987-05-12

Publications (1)

Publication Number Publication Date
WO1988008928A1 true WO1988008928A1 (fr) 1988-11-17

Family

ID=10617187

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1988/000363 WO1988008928A1 (fr) 1987-05-12 1988-05-11 Remise en circulation de gaz d'echappement

Country Status (2)

Country Link
GB (1) GB2204915A (fr)
WO (1) WO1988008928A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7477982B2 (en) 2006-10-31 2009-01-13 Caterpillar Inc. Exhaust gas recirculation system
US7469692B2 (en) 2006-12-29 2008-12-30 Caterpillar Inc. Exhaust gas recirculation system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148286A (en) * 1976-10-01 1979-04-10 Nippon Soken, Inc. Exhaust gas recirculation system for an internal combustion engine
GB2012000A (en) * 1977-12-28 1979-07-18 Nissan Motor Electronically controlled exhaust gas recirculation system in internal combustion engine
US4242997A (en) * 1978-08-02 1981-01-06 Nippon Soken, Inc. Exhaust gas recirculation system for internal combustion engines
US4274385A (en) * 1978-12-06 1981-06-23 Nissan Motor Company, Limited Exhaust gas recirculation system for internal combustion engine
GB2109460A (en) * 1981-11-12 1983-06-02 Ford Motor Co Multi-stage exhaust gas recirculation system
EP0105808A2 (fr) * 1982-09-30 1984-04-18 Canadian Fram Limited Système de recirculation de gaz d'échappement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814070A (en) * 1972-12-26 1974-06-04 Bendix Corp Exhaust gas recirculation flow control system
JPS5325729A (en) * 1976-08-23 1978-03-09 Nissan Motor Co Ltd Electronic exhaust gas re-circulation control system
US4164206A (en) * 1978-01-19 1979-08-14 The Bendix Corporation Closed loop programmable EGR with coolant temperature sensitivity
US4196707A (en) * 1978-07-31 1980-04-08 General Motors Corporation Exhaust gas recirculation control
JPS55134747A (en) * 1979-04-10 1980-10-20 Nissan Motor Co Ltd Exhaust reflux controlling device
JPS5770944A (en) * 1980-10-20 1982-05-01 Mazda Motor Corp Exhaust gas reflux unit for engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148286A (en) * 1976-10-01 1979-04-10 Nippon Soken, Inc. Exhaust gas recirculation system for an internal combustion engine
GB2012000A (en) * 1977-12-28 1979-07-18 Nissan Motor Electronically controlled exhaust gas recirculation system in internal combustion engine
US4242997A (en) * 1978-08-02 1981-01-06 Nippon Soken, Inc. Exhaust gas recirculation system for internal combustion engines
US4274385A (en) * 1978-12-06 1981-06-23 Nissan Motor Company, Limited Exhaust gas recirculation system for internal combustion engine
GB2109460A (en) * 1981-11-12 1983-06-02 Ford Motor Co Multi-stage exhaust gas recirculation system
EP0105808A2 (fr) * 1982-09-30 1984-04-18 Canadian Fram Limited Système de recirculation de gaz d'échappement

Also Published As

Publication number Publication date
GB2204915A (en) 1988-11-23
GB8711170D0 (en) 1987-06-17

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