EP0171395A1 - Potentiometre - Google Patents

Potentiometre

Info

Publication number
EP0171395A1
EP0171395A1 EP85900060A EP85900060A EP0171395A1 EP 0171395 A1 EP0171395 A1 EP 0171395A1 EP 85900060 A EP85900060 A EP 85900060A EP 85900060 A EP85900060 A EP 85900060A EP 0171395 A1 EP0171395 A1 EP 0171395A1
Authority
EP
European Patent Office
Prior art keywords
potentiometer
contact
track
collector
switch
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.)
Pending
Application number
EP85900060A
Other languages
German (de)
English (en)
Inventor
Eric MÄNNLE
Peter-Josef Bauer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0171395A1 publication Critical patent/EP0171395A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/32—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path
    • H01C10/36—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path structurally combined with switching arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/106—Detection of demand or actuation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/50—Adjustable resistors structurally combined with switching arrangements

Definitions

  • the invention relates to a potentiometer, in particular for an electric accelerator pedal in motor vehicles, of the type specified in the preamble of claim 1.
  • potentiometers serve to control a servomotor which adjusts the fuel-air mixture supplied to the internal combustion engine or the motor vehicle engine - as when the otherwise usual accelerator pedal is actuated.
  • the servomotor is actuated, which causes the internal combustion engine to increase or decrease speed.
  • electrical switches to trigger certain functions depending on the control voltage supplied to the servomotor, such as an idle safety switch, full load switch, kick-down in the internal combustion engine of a motor vehicle -Switches, throttle switch and other switches, e.g. for gasoline pumps, ignition etc.
  • microswitches which are switched on and off via the potentiometer.
  • the installation effort required for the microswitches to be installed separately from the potentiometer is considerable.
  • the potentiometer according to the invention with the characterizing features of claim 1 has the advantage that it is very simple in construction and very inexpensive to manufacture.
  • the switching times can be assigned very precisely and with very small manufacturing tolerances to the potentiometer setting and the tapped control voltage.
  • Potentiometers and switches are robust, less susceptible to faults and therefore suitable for harsh operating conditions and have a relatively long service life.
  • FIG. 1 is a plan view of a potentiometer plate of a rotary potentiometer with switches
  • Fig. 2 is a plan view of a potentiometer actuator for use with the potentiometer plate in Fig. 1
  • Fig. 3 is a section along the line III-III in Fig. 2
  • Fig. 4 is a way Step diagram of the rotary potentiometer with switches according to FIGS. 1-3
  • FIG. 5 shows a schematic side view of a potentiometer according to a second exemplary embodiment
  • FIG. 6 is a plan view of the potentiometer plate of the potentiometer in FIG. 5.
  • the potentiometer for an electric accelerator pedal in a motor vehicle shown in its individual parts in FIGS. 1-3 is designed as a rotary potentiometer. It has a circular disk-shaped potentiometer plate 10, seen in plan view in FIG. 1, on which a collector track 11 designed as a resistance track is arranged.
  • the semicircular arc-shaped collector path li is applied to one disc half of the potentiometer plate 10 and extends approximately over an angle of 180 °.
  • the collector track 11 has a connection contact 12, 13, which is designed as a bore, into which from the rear the potentiometer plate 10 forth connecting cable can be inserted.
  • a likewise approximately semicircular sliding track 14 extends parallel, ie concentrically to the collector track 11, and is also connected to a connecting contact 16 via a connecting tab 15 as applied to the potentiometer plate 10.
  • a potentiometer actuator 17 shown in plan view in FIG. 2 and in section in FIG. 3 carries a cantilever 18 on which two sets of contact springs 19, 20 which are electrically connected are fastened.
  • a contact spring set 19 or 20 rests on the collector track 11 or on the sliding track 14.
  • the two sets of contact springs 19 and 20 thus form the grinder or potentiometer tap of the potentiometer, which, depending on the rotational position, taps off part of the voltage falling between the connection contacts 12 and 13 on the collector track 11 as control voltage, which can be removed from the connection contact 16 of the sliding track 14 .
  • the control voltage tapped by the grinder 19, 20 via the adjustment path of the potentiometer actuator 17 is shown in FIG. 4 below. It can be seen that the control voltage remains zero up to an angle of rotation of 30, then increases linearly with the angle of rotation and finally reaches the maximum amount at an angle of rotation of 150 °, which is maintained up to an angle of rotation of 180 °.
  • the other disc half of the potentiometer plate 10 represents a switching disc on which four electrical switches 21, 22, 23, 24 with switch-on and switch-off points spatially fixed with respect to the collector path 11 are arranged.
  • the switch-on and switch-off points of the switches 21-24 in association with the angle of rotation of the potentiometer are shown in the path-step diagram in FIG. 4.
  • the switching elements which effect the switching on and off are, as will be described, fastened to the potentiometer actuator 17 in an electrically insulated manner.
  • Each switch 21-24 has a contact track 25, 26, 27, 28 applied to the potentiometer plate 10, the beginning and end of which determine the switch-on and switch-off points of the switch 21-24. Furthermore, each switch 21 - 24 has a contact finger 29, 30, which is mechanically connected to the potentiometer actuator 17 and can be rotated over the contact path, whereby it slidably rests on the latter. Since the two switches 21 and 22 and the two switches 23 and 24 alternately close overlapping one after the other in time, their contact tracks 25, 26 and 27, 28 are arranged one behind the other in a substantially aligned manner so that the contact tracks
  • Each contact track 25-28 has a connection contact 31-34, which, like the collector track 11, are designed as boreholes for inserting connection cables from the rear.
  • Concentric to the four contact tracks 25-28 is a counter potential track 35, which is provided with a connection contact 36, towards the axis of the potentiometer plate 10.
  • the potentiometer actuator 17 carries a second, diametrically opposite arm 37 on which the two contact fingers 29, 30 and a further contact finger 38 are arranged, which rests resiliently on the counter potential path 35 in each rotational position of the potentiometer actuator 17.
  • the contact finger 38 forms with each of the contact fingers 29, 30 a contact bridge connecting the counter potential path 35 with the contact paths 25, 26 and 27, 28, which represents the switching element of the switches 21-24.
  • Each of the contact fingers 29, 30, 38 is designed as a contact spring set 39, 40 41.
  • the contact spring sets 39-41 sit insulated on the arm 37 and are connected to one another in an electrically conductive manner via a web 42.
  • the contact tracks 25-28 can be produced in the same way as the collector track 11, that is to say by methods customary in potentiometer technology. For higher outputs, it is expedient to design the contact tracks as metal plates which are embedded in the potentiometer plate 10.
  • the potentiometer shown schematically in FIGS. 5 and 6 as a further exemplary embodiment is identical in its mode of operation to that described and is only slightly modified in its construction. Insofar as components match, they are identified by the same reference numerals, but with a comma.
  • the potentiometer plate 10 ' is designed as a circular disk (FIG. 6) and the potentiometer actuator 17' as a rotary member, which is one at the Potentiometer plate 10 'centrally located pin 50' is rotatable (Fig. 5).
  • the contact tracks 51 'and 52' and the collector track 11 ' are on the same half of the potentiometer plate 10' and the mating contact track 35 'and the slide track 14' electrically assigned to the collector track 11 ' the other half of the disc.
  • the contact tracks 51 'and 52' which in turn are aligned one behind the other, of two switches actuated one after the other are in turn located on a semicircular arch which here extends concentrically to the collector track 11 '.
  • the contact track 11 'and collector tracks 51', 52 ' are spatially arranged as close as possible to one another.
  • This arrangement of contact tracks 51 ', 52' and collector track 11 ' has the advantage that the potentiometer does not have to be manufactured with great precision or adjusted subsequently in order to assign the voltage divider ratio precisely, i.e. the voltage tapped at the potentiometer in relation to the total voltage, and the switching time of the to achieve switches formed by the contact tracks 51 'and 52'.
  • the eccentricity of the potentiometer actuator 17 'to the potentiometer plate 10' which is caused by the eccentricity of the fulcrum or by tolerance in the pressing height of the rotary member, leads to no or only a small, still permissible change in the voltage divider ratio at the respective switching time, ie the time the switches respond.
  • the switches are already a standard and without the need for adjustment exactly a certain angle of rotation of the potentiometer actuator 17 'and thus assigned a reliably accurate voltage divider ratio.
  • the potentiometer actuator 17 ' which is designed as a rotary member, has two electrically insulated rotary brackets 53' and 54 'which are connected to one another in a rotationally fixed manner.
  • the two rotating brackets 53 ', 54' are electrically insulated from one another and fastened to a retaining ring 55 'sliding on the pin 50', so that they rotate synchronously with one another.
  • the rotating bracket 53 ' has two electrically connected, diametrically arranged grinding spring sets 56', 57 'which resiliently rest on the associated conductor tracks, namely on the collector track 11' and the sliding track 14 '.
  • the other rotary bracket 54 ' also carries identically designed grinding spring sets 58' and 59 'which slide on the contact tracks 51' and 52 'or on the counter potential track 35'.
  • switches can be provided which open and close overlapping in time.
  • one or more contact tracks are to be provided, which are to be arranged as semicircular arcs concentrically with the collector track 11 '.
  • parallel contact tracks are expediently provided on both sides of the collector track 11 'and as close as possible to it.
  • the pivot bracket 54 'then receives a further set of grinding springs, which rests on the further parallel concentric contact tracks.
  • the invention is not based on the embodiment of a rotary potentiometer described above limits.
  • the potentiometer can be designed as a slide potentiometer, in which the collector track and the contact tracks are parallel to one another.
  • contact tracks that close one after the other in time and do not overlap in time lie in the same way along the displacement path of the potentiometer actuator in alignment with one another.
  • the collector track and contact tracks can also be arranged on different sides of the potentiometer plate.
  • the switching elements of the switches 21-24 that is to say the contact fingers 29, 30 formed by the contact spring sets 39, 40, are attached to the potentiometer element 17 in an electrically insulated manner.
  • the potentiometer voltage itself can also be used to generate a switching signal in that the contact fingers 29, 30 are electrically conductively connected to the contact spring sets 19, 20 forming the wiper.
  • the mating contact track 35 on the potentiometer plate 10 and the associated contact finger 38 on the arm 37 can be omitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Adjustable Resistors (AREA)

Abstract

Le potentiomètre permet de déclencher des fonctions de commutation en correspondance avec la position du potentiomètre. Dans le but de coordonner avec précision les fonctions de commutation en correspondance avec la position du potentiomètres des interrupteurs électriques (21-24) sont disposés sur la plaque du potentiomètre (10) portant la piste collectrice (11) et présentent des points de coupure et de fermeture de circuit ayant une position déterminée par rapport à la piste collectrice (11). Les éléments des interrupteurs qui provoquent la fermeture ou la coupure du contact sont fixés et isolés électriquement sur un organe d'actionnement (17) du potentiomètre qui porte habituellement le curseur (19, 20) du potentiomètre. De préférence, chaque interrupteur (21-24) est constitué d'une piste de contact (25-28) et d'un doigt de contact (29, 30) lié mécaniquement à l'organe d'actionnement (17) du potentiomètre et tournant et glissant sur la piste de contact (25-28) correspondante. Le début et la fin de chaque piste de contact (25-28) déterminent le point de fermeture et le point d'ouverture de chaque interrupteur (21-24).
EP85900060A 1984-02-04 1984-12-10 Potentiometre Pending EP0171395A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3403944 1984-02-04
DE3403944 1984-02-04
DE19843416495 DE3416495A1 (de) 1984-02-04 1984-05-04 Potentiometer
DE3416495 1984-05-04

Publications (1)

Publication Number Publication Date
EP0171395A1 true EP0171395A1 (fr) 1986-02-19

Family

ID=25818194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85900060A Pending EP0171395A1 (fr) 1984-02-04 1984-12-10 Potentiometre

Country Status (4)

Country Link
US (1) US4706062A (fr)
EP (1) EP0171395A1 (fr)
DE (1) DE3416495A1 (fr)
WO (1) WO1985003594A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3612904A1 (de) * 1986-04-17 1987-10-22 Bosch Gmbh Robert Verfahren zur toleranzkompensation eines positionsgebersignals
DE3612905C2 (de) * 1986-04-17 1993-11-18 Bosch Gmbh Robert Verfahren zum Auslösen einer Schaltfunktion
DE3705969A1 (de) * 1987-02-25 1988-09-08 Pierburg Gmbh Dreh- oder schiebeschalter
JPH01296207A (ja) * 1988-05-25 1989-11-29 Ricoh Co Ltd 位置検出装置
US5144278A (en) * 1989-08-01 1992-09-01 Lutron Electronics Co., Inc. Variable impedance device and circuit for sensing adjustment thereof
JPH03211802A (ja) * 1990-01-17 1991-09-17 Aisin Seiki Co Ltd スイッチ付可変抵抗器
US5200747A (en) * 1990-12-13 1993-04-06 Bourns, Inc. Turn counting position sensor
DE4137989A1 (de) * 1991-11-19 1993-05-27 Siedle Horst Kg Beweglicher abgriff oder schleifer fuer potentiometer
US5415144A (en) * 1994-01-14 1995-05-16 Robertshaw Controls Company Throttle position validation method and apparatus
DE102007011658B4 (de) * 2007-03-09 2024-05-16 Marquardt Gmbh Elektrischer Schalter

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US862842A (en) * 1907-05-03 1907-08-06 Leeds & Northrup Co Rheostat.
DE1134141B (de) * 1959-06-13 1962-08-02 Nordmende Potentiometer zur Lautstaerkeregelung fuer Geraete zur stereophonischen Klangwiedergabe
US3863039A (en) * 1970-06-01 1975-01-28 Spectrol Electronics Corp Combined potentiometer and switching structure
US4087776A (en) * 1976-12-22 1978-05-02 Drexel Industries, Inc. Accelerator switch assembly
US4237443A (en) * 1979-06-20 1980-12-02 Novotechnik Kg Offterdinger & Co. Movable wiper for potentiometers
DE3209463A1 (de) * 1982-03-16 1983-09-29 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Schaltungsanordnung zum betaetigen der drosselklappe eines kraftfahrzeug-verbrennungsmotors
GB2135526B (en) * 1983-02-22 1986-05-21 Welwyn Electronics Ltd Calibrated potentiometer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8503594A1 *

Also Published As

Publication number Publication date
DE3416495A1 (de) 1985-08-08
US4706062A (en) 1987-11-10
WO1985003594A1 (fr) 1985-08-15

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19850824

AK Designated contracting states

Designated state(s): DE FR GB

17Q First examination report despatched

Effective date: 19870213

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MAENNLE, ERIC

Inventor name: BAUER, PETER-JOSEF