EP0124399A2 - Elektrischer Vakuumregler - Google Patents

Elektrischer Vakuumregler Download PDF

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Publication number
EP0124399A2
EP0124399A2 EP84400623A EP84400623A EP0124399A2 EP 0124399 A2 EP0124399 A2 EP 0124399A2 EP 84400623 A EP84400623 A EP 84400623A EP 84400623 A EP84400623 A EP 84400623A EP 0124399 A2 EP0124399 A2 EP 0124399A2
Authority
EP
European Patent Office
Prior art keywords
vacuum
source
disk
orifice
regulator
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Withdrawn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
EP84400623A
Other languages
English (en)
French (fr)
Other versions
EP0124399A3 (de
Inventor
Johannes Mulder
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.)
Canadian Fram Ltd
Original Assignee
Canadian Fram Ltd
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 Canadian Fram Ltd filed Critical Canadian Fram Ltd
Publication of EP0124399A2 publication Critical patent/EP0124399A2/de
Publication of EP0124399A3 publication Critical patent/EP0124399A3/de
Withdrawn legal-status Critical Current

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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

Definitions

  • This invention relates to vacuum regulators in general and in particular to electric or electronic vacuum regulators for use with internal combustion engines.
  • vacuum regulators are used to control the vacuum which is created in the engine and used to operate many of the various pollution control devices.
  • any control source and vacuum sources are no different, it is a requirement that the control value of the source be either regulated or always known. If the source is to be regulated or maintained at a single fixed value, then the conventional mechanically constructed vacuum regulator comprising springs, diaphragms and orifices perform adequately.
  • ROM read-only-memories
  • Such prior art vacuum regulators have a rubber diaphragm for separating the vacuum and atmospheric chambers.
  • An armature is attached to the diaphragm, and to form the regulating part of the valve, a seal is placed between the armature and the rubber diaphragm.
  • the seal wears causing the regulator calibration to drift.
  • a steel member in order to complete the magnetic circuit a steel member must be added thereby increasing the number of elements making up the regulator.
  • the present electric vacuum regulator was developed.
  • One element, a steel disk or armature separates and provides a seal between the vacuum and atmospheric chambers and completes the magnetic circuit for the solenoid actuator. Because it seals on a brass seat, wear of the internal members of the regulator is virtually eliminated.
  • an electric vacuum regulator having an input port for connection to a vacuum source such as manifold vacuum in an internal combustion engine.
  • a vacuum operated device such as an exhaust gas recirculation valve is connected to an output port .of"the regulator.
  • a mixing chamber interconnects the two ports and positioned within the chamber is an orifice which is connected to a source of air pressure such as atmosphere.
  • a steel disk is adapted to seal the orifice from the chamber and since this is an electrically operated regulator, a coil surrounds a stator for generating magnetic flux causing the disk to be attracted towards the seat. The coil is energized by a unique duty cycle control signal generated in the computer in response to the operating conditions of the engine.
  • a bias spring is placed to maintain the disk in a position closing the orifice when there is no electrical signal and no vacuum.
  • a system is illustrated in Fig. 1 as may be found on an internal combustion engine of a motor vehicle.
  • the vacuum utilization device is an exhaust gas recirculation (EGR) valve 10 which operates under certain engine operating conditions to recirculate, from the exhaust manifold 12 to the intake manifold 14, exhaust gas into the air-fuel mixture.
  • EGR exhaust gas recirculation
  • Connected to the vacuum input 16 of the EGR valve 10 is the output port 18 of the electric vacuum regulator (EVR) 20 and an input port 22 of a vacuum switch 24.
  • EGR electric vacuum regulator
  • the vacuum switch 24 functions to determine the presence of vacuum in the vacuum line to the EGR valve 10. If a vacuum hose is off or if the diaphragm is bad or if the EVR 20 is defective or if there is any other condition which adversely affects the vacuum level, the vacuum switch 24 generates a signal to the electronic control unit (ECU) or onboard computer 26.
  • ECU electronice control unit
  • the function of the ECU 26, as far as the present invention is concerned, is to map the curve of the output vacuum value from the electric vacuum regulator 20 against the voltage duty cycle of the electric vacuum regulator.
  • the ECU 26 interprets the map in a ROM and develops the appropriate voltage duty cycle signal for the electric vacuum regulator 20 to regulate the output vacuum.
  • the electric vacuum regulator 20 receives the duty cycle signal and controls the output vacuum from its output port 18 according to the duty cycle of the signal. This is accomplished by mixing atmospheric pressure taken from an air pressure source 27 and the vacuum pressure taken from a vacuum source such as the intake manifold 14 of the engine. This is schematically represented by the line from the intake manifold 14 to the input port 28 of the electric vacuum regulator 20. The atmospheric pressure is provided through an orifice 30 in the regulator to the mixing chamber 32.
  • the EGR valve 10 during normal engine operation is supplied with a variable vacuum signal which causes the EGR valve 10 to open a known amount and allow a calculated amount of exhaust gas to mix with the air-fuel mixture.
  • the constant current circuit 34 maintains the current level to the electric vacuum regulator 20 regardless of resistance changes in the coil due to temperature or aging or due to fluctuations or changes in the battery voltage.
  • the system of Fig. 1 utilizes a positive gain electric vacuum regulator 20 which is defined as having the vacuum output therefrom increase as the duty cycle increases to 100%.
  • the positive gain electric vacuum regulator 20 is illustrated in Fig. 2 and the graph of Fig. 4 illustrates its output characteristics for various adjustments of the stator means 36.
  • Fig. 1 utilized a negative gain electric vacuum regulator 21, which is illustrated in Fig. 3, the vacuum switch 24 would be omitted as any failure of the electric vacuum regulator 21 would affect the operability of the engine enough to make the engine operator notice that there is a failure.
  • the negative gain electric vacuum regulator 21 is defined as having the vacuum output therefrom decreasing as the duty cycle increases to 100%.
  • the graph of Fig. 5 illustrates the output characteristics of the negative gain electric vacuum regulator 21 for various stator adjustments.
  • the electric vacuum regulator 20 as illustrated in Fig. 2 has a cap 38 having at least a pair of ports 18 and 28 at one end, one being the input port 28 and the other the output port 18.
  • the interior of the cap 38 forms a portion of the mixing chamber 32 interconnecting the two ports.
  • Each port 18 and 28 is adapted to receive a vacuum hose, which is not shown, for connecting the input port 28 to a source of the vacuum 14, and for connecting the output port 18 to the utilization device 16.
  • a bobbin means 42 Connected to the cap 38 is a bobbin means 42 providing an area to wind an electromagetic coil 44 therearound and cooperates with the cap 38 to form the remaining portion of the mixing chamber 32.
  • the bobbin means 42 is enclosed by a shell 46 fabricated from a magnetizable material. The leads or the ends of the coil are extended to a pair of terminals which are connected to wires 48 extending outward of the shell 46 for receiving the electrical control signals.
  • a seating means 50 having a central orifice 30 is retained within the bobbin means 42 in Figure 2.
  • the central orifice 30 is concentric with the central aperture of the bobbin means 42 which receives the stator means 36.
  • the stator means 36 is an elongated shaft threaded at one end to provide an adjustment for positioning the stator means 36 in alignment with the central orifice 30 of the seating means 50. This adjustment, which may be made by means of a small hexagonal wrench or similar tool applied to a receptacle 52 in the end of the stator means 36, affects the operation of electromagnetic circuit as will hereinafter be described.
  • a flat steel disk 54 which is free to move and is constrained only by the walls of the mixing chamber 32.
  • the mixing chamber 32 interconnects the input port 28 and the output port 18 providing for the transfer of vacuum therebetween.
  • the disk 54 rests upon the seating means 50 encircling the orifice 30.
  • a spring bias means 56 is positioned so as to bias the disk 54 against the seating means 50.
  • bleed orifice or restrictor 58 Located in the input port 28 upstream of the mixing chamber 32 is a bleed orifice or restrictor 58 which controls the amount of vacuum flow from the input port 28.
  • a filter means 60 Adjacent a plurality of apertures 40 in one end of the shell 46 is a filter means 60 which prevents any particles in the air pressure source 27 from getting into the valve. As is customary in devices of this nature, the filter 60 operates to make sure that the air that flows within the valve is clean of any particles which would inhibit or hinder the operation of the valve.
  • the stator means 36 has a crosshole 64 inclined to its longitudinal axis to provide for the flow air therethrough.
  • the crosshole 64 is then connected with the longitudinally extending bore 66 from the middle of the stator means 36 to the top of the stator means 36.
  • this bore 66 is the central orifice 30 for supplying the air pressure source 27 to the mixing chamber 32 of the vacuum regulator 20.
  • Fig. 4 shows a series of curves 68-71 illustrating the relationship of the output vacuum as a percent of the voltage duty cycle of the operation of the coil 44.
  • the onboard computer 26 of Fig. 1 determines the voltage duty cycle desired for operation of the coil 44 so that the vacuum of the output port 18 is a previously calculated value. This value enhances the operation of the internal combustion engine which is controlled in part by the utilization device 10 from the output port 18 of the EVR 20.
  • the coil 44 is not energized the position of the steel disk 54 is determined by the pressure of the air from the air pressure source 27, the spring force from the spring bias means 56 and the amount of vacuum in the mixing chamber 32.
  • the duty cycle signal will cause the vacuum regulator 20 to operate at some percent duty cycle.
  • the curves 68-71 of Fig. 4 indicate that for different adjustments of the stator means 36 the output vacuum varies with the value of the duty cycle.
  • the fourth curve 71 indicates that there is a point in the duty cycle with a particular stator means 36 adjustment when the magnetic force retains the steel disk 54 against its seating means 50 and the output 18 and input 28 ports are substantially connected together such that the input and output vacuums are equal.
  • the magnetic circuit comprises the shell 46, the disk 54 and the stator means 36.
  • the coil 44 when supplied with a current, will generate the magnetic field for the magnetic circuit. It is to be understood in both the embodiments, that once an EVR is set up and the stator means 36 adjustment is made, only one of the curves of Fig. 4, or Fig. 5 as the case may be, is applicable as the stator means 36 is sealed in place.
  • the electric vacuum regulator of the present invention either the positive gain embodiment 20 or the negative gain embodiment 21, comprises a steel disk 54 which functions to separate and seal the vacuum side of the regulator from the atmospheric side and to complete the magnetic circuit.
  • the central orifice 30 is surrounded by a seating means 50 which in the preferred embodiment is brass and non-magnetic and also is virtually wear resistant in this application.
  • the steel disk 54 seats on the brass seating means 50 sealing the central orifice 30 supplying air pressure into the mixing chamber 32 of the regulator 20 or 21.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Measuring Fluid Pressure (AREA)
  • Control Of Fluid Pressure (AREA)
  • Magnetically Actuated Valves (AREA)
EP84400623A 1983-04-01 1984-03-28 Elektrischer Vakuumregler Withdrawn EP0124399A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US48112683A 1983-04-01 1983-04-01
US481126 1983-04-01

Publications (2)

Publication Number Publication Date
EP0124399A2 true EP0124399A2 (de) 1984-11-07
EP0124399A3 EP0124399A3 (de) 1986-01-29

Family

ID=23910712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400623A Withdrawn EP0124399A3 (de) 1983-04-01 1984-03-28 Elektrischer Vakuumregler

Country Status (4)

Country Link
EP (1) EP0124399A3 (de)
JP (1) JPS59190453A (de)
AU (1) AU2586284A (de)
CA (1) CA1252680A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573812A1 (fr) * 1984-11-26 1986-05-30 Lectron Products Regulateur de vide
US4793372A (en) * 1987-10-29 1988-12-27 Bendix Electronics Limited Electronic vacuum regulator (EVR) with bi-metallic armature disk temperature compensator
US4850384A (en) * 1988-09-28 1989-07-25 Siemens-Bendix Automotive Electronics Limited Electric vacuum regulator
EP0743444A1 (de) * 1995-04-20 1996-11-20 Borg-Warner Automotive, Inc. Temperaturkompensiertes Abgasrückführungssystem
CN102128104A (zh) * 2011-04-08 2011-07-20 无锡隆盛科技有限公司 一种进出气口可互换的电动egr阀

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005733A (en) * 1975-11-17 1977-02-01 General Motors Corporation Pressure control valve
JPS57208378A (en) * 1981-06-19 1982-12-21 Nippon Denso Co Ltd Negative pressure controlling valve
EP0077599A1 (de) * 1981-10-16 1983-04-27 Borg-Warner Corporation Proportional-Magnetventil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005733A (en) * 1975-11-17 1977-02-01 General Motors Corporation Pressure control valve
JPS57208378A (en) * 1981-06-19 1982-12-21 Nippon Denso Co Ltd Negative pressure controlling valve
EP0077599A1 (de) * 1981-10-16 1983-04-27 Borg-Warner Corporation Proportional-Magnetventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 68 (M-201)[1213], 19th March 1983; & JP - A - 57 208 378 (NIPPON DENSO K.K.) 21-12-1982 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573812A1 (fr) * 1984-11-26 1986-05-30 Lectron Products Regulateur de vide
US4793372A (en) * 1987-10-29 1988-12-27 Bendix Electronics Limited Electronic vacuum regulator (EVR) with bi-metallic armature disk temperature compensator
US4850384A (en) * 1988-09-28 1989-07-25 Siemens-Bendix Automotive Electronics Limited Electric vacuum regulator
EP0743444A1 (de) * 1995-04-20 1996-11-20 Borg-Warner Automotive, Inc. Temperaturkompensiertes Abgasrückführungssystem
US5722632A (en) * 1995-04-20 1998-03-03 Borg-Warner Automotive, Inc. Temperature-compensated exhaust gas recirculation system
CN102128104A (zh) * 2011-04-08 2011-07-20 无锡隆盛科技有限公司 一种进出气口可互换的电动egr阀

Also Published As

Publication number Publication date
JPS59190453A (ja) 1984-10-29
AU2586284A (en) 1984-10-04
EP0124399A3 (de) 1986-01-29
CA1252680A (en) 1989-04-18

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Effective date: 19860930

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Inventor name: MULDER, JOHANNES