EP0096408A2 - Steuereinrichtung zur Drosselklappenöffnung unter Verwendung eines Unterdruckservomotors - Google Patents

Steuereinrichtung zur Drosselklappenöffnung unter Verwendung eines Unterdruckservomotors Download PDF

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Publication number
EP0096408A2
EP0096408A2 EP83105548A EP83105548A EP0096408A2 EP 0096408 A2 EP0096408 A2 EP 0096408A2 EP 83105548 A EP83105548 A EP 83105548A EP 83105548 A EP83105548 A EP 83105548A EP 0096408 A2 EP0096408 A2 EP 0096408A2
Authority
EP
European Patent Office
Prior art keywords
driving
negative pressure
diaphragm
determining means
pressure
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Withdrawn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
EP83105548A
Other languages
English (en)
French (fr)
Other versions
EP0096408A3 (de
Inventor
Tomoo Ito
Hiroshi Kamifuji
Haruhiko Kobayashi
Tomiya Itakura
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.)
Hitachi Ltd
Hitachi Astemo Ltd
Original Assignee
Hitachi Automotive Engineering Co Ltd
Hitachi 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
Priority claimed from JP9498582A external-priority patent/JPS58214002A/ja
Priority claimed from JP9498682A external-priority patent/JPS58214003A/ja
Application filed by Hitachi Automotive Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Automotive Engineering Co Ltd
Publication of EP0096408A2 publication Critical patent/EP0096408A2/de
Publication of EP0096408A3 publication Critical patent/EP0096408A3/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Withdrawn legal-status Critical Current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
    • F02M3/00—Idling devices for carburettors
    • F02M3/06—Increasing idling speed
    • F02M3/062—Increasing idling speed by altering as a function of motor r.p.m. the throttle valve stop or the fuel conduit cross-section by means of pneumatic or hydraulic means

Definitions

  • the present invention relates to a pressure servomotor device capable of performing a precise-position control, as well as to a throttle valve opening degree control device making use of this pressure servomotor.
  • United States Patent Specification No. 3,381,771 discloses a typical conventional servomotor, in which a controlling negative pressure is introduced into a negative pressure chamber formed by a diaphragm and a cover so that the diaphragm is deflected by the negative pressure to control the position of an operation shaft fixed to the diaphragm. Namely, the position control is effected by a balance between the load connected to the operation shaft and the load generated by the diaphragm by the action of the control negative pressure introduced into the negative pressure chamber.
  • Such conventional pressure servomotor gives rise to a problem that accurate position control is failed when there is a difference in the level of load between forward and backward strokes of the diaphragm.
  • Such difference is experienced, for example, in the operation of a throttle valve shaft in carburetors for automotive engines. Namely, there is a large difference of torque between the opening rotation and closing rotation of the throttle valve shaft. Therefore, when the negative pressure actuated type servomotor is used for the position control of the throttle valve shaft, the negative pressure is not in proportion to the stroke of the diaphragm. Namely, a curve representing the relationship between the negative pressure and the stroke shows a large hysteresis.
  • this type of servomotor suffers from a serious drawback of inaccuracy in the position control, although it can easily provide a large driving power.
  • a pressure servomotor comprising: a driving diaphragm for driving an operation shaft; a driving pressure chamber defined by the driving diaphragm and a cover; a pressure passage through which a driving pressure is communicated to a pressure source so that a driving pressure is introduced into the driving pressure chamber; a control position determining means for determining the position of the operation shaft; and a pressure regulating means adapted to weaken the pressure in the driving pressure chamber by a cooperation of the control position determining means and the driving diaphragm when the driving diaphragm is deflected to a position determined by the control position determining means.
  • Fig. 1 schematically shows in section a negative pressure actuated type servomotor which is an embodiment of a pressure servomotor in accordance with the invention.
  • the driving diaphragm mechanism has a driving negative pressure chamber 12 defined by a driving diaphragm 10 and a cover 11, into which driving negative pressure is introduced through a negative pressure introduction pipe 13 provided on the cover 11.
  • the driving negative pressure chamber 12 accomodates a compression spring 14 which acts between the inner surfaces of the driving diaphragm 10 and the cover 11.
  • a frame 16 is secured to the outer surface of the driving diaphragm 10.
  • An operation shaft 15 is connected at its one end to the frame 16 and at its other end to the load to be actuated.
  • the frame 16 is movable reciprocatingly as a unit with the diaphragm 10.
  • the driving diaphragm In operation, as negative pressure is introduced into the driving nagative. pressure chamber 12, the driving diaphragm is deflected in accordance with the level of the negative pressure thereby to reciprocatingly move the frame 16 and, hence, the operation shaft 15.
  • a leak passage 17 is formed at the center of the driving diaphragm 10 to provide a communication between the driving negative pressure chamber 12 and the atmosphere.
  • the leak passage 17 is adapted to be opened and closed by a signal diaphragm mechanism serving as means for determining the control position.
  • the signal diaphragm mechanism incorporates a signal diaphragm 18 opposing to the driving diaphragm 10.
  • the signal diaphragm 18 cooperates with a cover 19 to define a signal negative pressure chamber 20 therebetween.
  • the cover 19 of the signal diaphragm mechanism is integrally fixed to the cover 11 of the driving diaphragm mechanism.
  • the signal diaphragm 18 is adapted to be actuated by a signal negative pressure introduced through a signal negative pressure introduction pipe 21 provided on the cover 19.
  • the signal negative pressure chamber 20 accomodates a compression spring 22 acting between the inner surfaces of the signal diaphragm 18 and a cover 19 so that the position of the signal diaphragm 18 is set by the balance between the force produced by the compression spring 22 and the force produced by the signal negative pressure.
  • the signal diaphragm 18 opposing to the driving diaphragm 10 is provided with a pressure regulating means constituted by a valve body 23 opposing to the leak passage 17 and adapted to open and close the latter in accordance with the operation of the signal diaphragm 18.
  • the driving negative pressure introduced into the driving negative pressure chamber 12 is maintained at the lowest at the level which provides a force capable of overcoming the load applied to the operation shaft 15.
  • a negative pressure of a level necessary for balancingly holding the signal diaphragm 18 at the desired position is introduced to the signal negative pressure chamber 20.
  • a load to be controlled is imposed on the operation shaft 15.
  • the negative pressure actuated servomotor having the described construction operates in a manner explained hereinunder.
  • the servomotor operates in the following manner from the equilibrium state in response to a change in the load or to a change in the signal negative pressure serving as the control signal.
  • the arrangement is such that the driving diaphragm 10 is moved in the direction for negating disturbance or noise if any. Therefore, the driving diaphragm 10 is always held at the predetermined position where the balance of force is obtained and is made to follow up the movement of the signal diaphragm 18. It is, therefore; possible to move the object exactly to the aimed position without being affected by the change in the load, by a suitable control of the signal negative pressure.
  • Fig. 2 shows a second embodiment of the invention in which a push rod 24 extending through the driving negative pressure chamber 12 and the cover 11 is used in place of the operation shaft 15 and the frame 16 used in the first embodiment, so as to produce a thrust force as the driving power.
  • a seal 25 is provided between the cover 11 and the push rod 24 and a bearing 26 is used to hold the portion of the push rod 24 extending outwardly of the cover 11.
  • This embodiment is adapted for use particularly in such a case the installation space for the servomotor is limited, because the driving power is derived as a thrust force.
  • Fig. 4 shows a negative pressure actuated type servomotor as a third embodiment of the invention in which the signal diaphragm mechanism is mounted on the outer surface of the cover 11 of the driving diaphragm mechanism, and a valve device is separately mounted on the driving diaphragm 10.
  • a push rod 28 attached to the signal diaphragm 18 is movable through the cover 11 into contact with the valve body 23.
  • the valve device is provided with a valve spring 29 which biases the valve body 23 so as to normally close the leak passage 17.
  • This embodiment is adantageous in that the signal diaphragm mechanism serving as an actuator is extremely easily mounted.
  • F ig. 5 shows a fourth embodiment of the invention in which a valve device similar to that in the third embodiment is attached to the signal diaphragm 18 and the operation shaft 15 attached to the driving diaphragm 10 serves also as a rod for opening and closing the valve body 23 of the valve device.
  • a valve mounting sleeve 30 extending through the cover 11 of the driving diaphragm mechanism is secured to the signal diaphragm 18, and a vent hole 31 for communication with the exterior is formed in the valve mounting sleeve 30.
  • This embodiment offers an advantage in prevention of contamination by foreign matters introduced from the outside.
  • Fig. 6 shows a negative pressure actuated servomotor embodying the present invention, applied to a system for controlling a throttle valve 34 of an internal combustion engine.
  • the intake negative pressure available in the intake pipe 35 is utilized as the driving negative pressure.
  • a negative pressure serving as a control signal is produced by means of a duty control type solenoid valve 33 from a constant pressure which is obtained through a constant pressure valve 32 from the intake valve.
  • a signal diaphragm mechanism is used as the means for determining the control position. This, however, is not exclusive and the same advantage is obtained when other type of actuator, such as a pulse motor, D.C. motor or the like is used in place of the signal diaphragm mechanism.
  • the position of the driving diaphragm is determined by relieving the driving negative pressure to the atmosphere.
  • An explanation will be made hreinunder as to another embodiment in which the driving negative pressure itself is controlled to vary the force generated by the driving diaphragm.
  • a fifth embodiment of the pressure servomotor in accordance with the invention has a driving diaphragm 10, cover 11, compression spring 14, driving negative pressure chamber 12, operation shaft 15, leak passage 17, valve body 23 and a valve spring all of which are identical to those shown in Fig. 4.
  • a reference numeral 36 designates a housing of a pulse motor 37 which is fixed to the rear side of the cover 11, while numerals 38 and 39 designate feed coils of a pulse motor 37.
  • Ball bearings 40 and 41 are mounted on the housing 36 and rotatably carries a shaft 42 carrying a permanent magnet 43.
  • a rod 44 is threadedly engaged by the shaft 43.
  • a rod guide 45 as a part of the housing 36 fits in a bore formed in the rod 44 so as to permit the latter to move in the axial direction but not to rotate.
  • the rod 44 is moved in the axial direction as the shaft 42 is rotated.
  • a reference numeral 46 designates a negative pressure pipe for introducing a driving negative pressure
  • numeral 47 denotes a passage for introducing the negative pressure to the driving negative pressure chamber 12.
  • a reference numeral 48 denotes a leak orifice which allows the negative pressure in the actuation negative pressure chamber to leak to the atmosphere.
  • a negative pressure of level sufficient to pull the load on the operation shaft is applied to the negative pressure pipe 46, so that the negative pressure in the driving negative pressure chamber 12 is-increased to deflect the diaphragm 10 to the left.
  • the diaphragm 10 is moved to the left so that the valve body 23 comes into contact with the opening in the rod 44 to cut off the negative pressure.
  • the negative pressure level in the driving negative pressure chamber 12 is lowered by a small amount of air coming through the leak orifice 48.
  • the reduction of negative pressure in the driving negative pressure chamber 12 in turn causes the diaphragm 10 to be moved to the right by the force of the compression spring 14 so that the valve body 23 is moved away from the opening of the rod 44 to raise again the level of negative pressure in the driving negative pressure chamber 12. As this operation is repeated, the diaphragm 10 remains in the close proximity of the opening in the rod 44.
  • the same operation is made also in response to an increase or decrease of the load imposed on the operation shaft, as well as to a change in the level of the negative pressure applied to the negative pressure pipe 46, although the distance between the valve body 23 and the rod 44 is changed slightly.
  • the pulse motor 37 is operated in accordance with a control signal, the rod 44 is moved to the left and right to cause a change in the distance between the valve member 23 and the opening of the rod 44, so that the position of the diaphragm 10 is changed as if the valve body 23 follows up the opening of the rod 44, due to the principle as explained hereinbefore.
  • a pulse motor having a very small capacity can satisfactorily operate in this embodiment.
  • Fig. 8 shows a sixth embodiment of the invention, which is materially identical to the embodiment shown in Fig. 7 except that a negative pressure type actuator having a diaphragm 49 and a control negative pressure chamber 50 is used in place of the pulse motor as the actuator for producing the position signal, that the position of the actuator with respect to the diaphragm 10 is reversed and that the actuating power is derived as a thrust force instead of the pulling force.
  • the signal diaphragm 49 similar to that in Fig. 4 is moved to the left, it pushes the rod end 52 of the needle valve 51 so that a valve seat orifice 53 and a needle valve 51 are moved apart from each other to permit the driving negative pressure to be introduced into the driving negative pressure chamber 12 through the negative pressure pipe 46.
  • the diaphragm 10 also is moved to the left.
  • the needle valve 51 is held in contact with the valve seat orifice 53 so that the negative pressure level in the driving negative pressure chamber 12 is lowered by the atmospheric air introduced through the leak orifice 48.
  • the valve seat orifice 53 is moved away from the needle valve 51 to increase again the negative pressure level in the driving negative pressure chamber 12. This operation is repeated to hold the diaphragm 10 at the predetermined position.
  • the reduction of the negative pressure level in the driving negative pressure chamber 12 is caused by the air flowing only through the leak orifice 48.
  • a higher response speed of the actuator can be obtained by providing the driving diaphragm 10 with a second leak orifice 54 to increase the rate of drop of the negative pressure in the negative pressure chamber 12 as in the modification shown in Fig. 9.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Driven Valves (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
EP83105548A 1982-06-04 1983-06-06 Steuereinrichtung zur Drosselklappenöffnung unter Verwendung eines Unterdruckservomotors Withdrawn EP0096408A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP94985/82 1982-06-04
JP9498582A JPS58214002A (ja) 1982-06-04 1982-06-04 負圧サ−ボモ−タ
JP94986/82 1982-06-04
JP9498682A JPS58214003A (ja) 1982-06-04 1982-06-04 圧力サーボモータを用いた絞り弁開度制御装置

Publications (2)

Publication Number Publication Date
EP0096408A2 true EP0096408A2 (de) 1983-12-21
EP0096408A3 EP0096408A3 (de) 1984-12-27

Family

ID=26436212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83105548A Withdrawn EP0096408A3 (de) 1982-06-04 1983-06-06 Steuereinrichtung zur Drosselklappenöffnung unter Verwendung eines Unterdruckservomotors

Country Status (1)

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EP (1) EP0096408A3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3438067A1 (de) * 1983-10-31 1985-05-09 Nissan Motor Co., Ltd., Yokohama, Kanagawa Unterdruckbetaetigungsvorrichtung mit selbstschutz

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009073170A2 (en) 2007-12-03 2009-06-11 Cts Corporation Linear position sensor
DE112009003688B4 (de) 2008-11-26 2013-09-19 Cts Corporation Linearpositionssensor mit Drehblockiervorrichtung
US9435630B2 (en) 2010-12-08 2016-09-06 Cts Corporation Actuator and linear position sensor assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3381771A (en) * 1966-05-17 1968-05-07 Bendix Corp Automobile speed control
FR2315617A1 (fr) * 1975-06-26 1977-01-21 Sibe Perfectionnements aux dispositifs de carburation pour moteurs a combustion interne
CA1106713A (en) * 1978-05-10 1981-08-11 John E. Cook Constant idle controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3438067A1 (de) * 1983-10-31 1985-05-09 Nissan Motor Co., Ltd., Yokohama, Kanagawa Unterdruckbetaetigungsvorrichtung mit selbstschutz

Also Published As

Publication number Publication date
EP0096408A3 (de) 1984-12-27

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Owner name: HITACHI AUTOMOTIVE ENGINEERING CO., LTD.

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Inventor name: ITO, TOMOO

Inventor name: KOBAYASHI, HARUHIKO

Inventor name: ITAKURA, TOMIYA

Inventor name: KAMIFUJI, HIROSHI