DE2123700A1 - Safety circuit for automatic motor vehicle transmissions - Google Patents

Safety circuit for automatic motor vehicle transmissions

Info

Publication number
DE2123700A1
DE2123700A1 DE19712123700 DE2123700A DE2123700A1 DE 2123700 A1 DE2123700 A1 DE 2123700A1 DE 19712123700 DE19712123700 DE 19712123700 DE 2123700 A DE2123700 A DE 2123700A DE 2123700 A1 DE2123700 A1 DE 2123700A1
Authority
DE
Germany
Prior art keywords
motor vehicle
output
differential amplifier
control signal
amplifier
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
DE19712123700
Other languages
German (de)
Inventor
Willi 7990 Friedrichshafen; Streif Franz 7778 Markdorf Kühnle
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Priority to DE19712123700 priority Critical patent/DE2123700A1/en
Publication of DE2123700A1 publication Critical patent/DE2123700A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1224—Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1244—Keeping the current state
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/1284—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is a sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H2710/00—Control devices for speed-change mechanisms, the speed change control is dependent on function parameters of the gearing
    • F16H2710/16—Control devices for speed-change mechanisms, the speed change control is dependent on function parameters of the gearing the gearing is not described or not essential
    • F16H2710/22—Control devices for speed-change mechanisms, the speed change control is dependent on function parameters of the gearing the gearing is not described or not essential the control being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/44—Inputs being a function of speed dependent on machine speed of the machine, e.g. the vehicle

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Description

Sicherheitsschaltung für automatische Kraftfahrzeuggetriebe Die Erfindung bezieht sich auf eine Schaltungsanordnung zur elektronisch gesteuerten automatischen Gangschaltung an Kraftfahrzeuggetrieben. Safety circuit for automatic motor vehicle transmissions The invention relates to a circuit arrangement for electronically controlled automatic Gear shifting on motor vehicle transmissions.

In Schaltungen dieser Art liefert ein Drehzahlgeber an der Abtriebsseite des Kraftfahrzeuggetriebes ein frequenzundloder amplitudenabhängiges Steuersignal, das in einem aus elektronischen Bauteilen aufgebauten Frequenzanalogwandler umgewandelt wird.In circuits of this type, a speed sensor delivers on the output side of the motor vehicle transmission a frequency- and / or amplitude-dependent control signal, which is converted in a frequency analog converter made up of electronic components will.

Das umgewandelte Steuersignal wirkt über vorgegebene Widerstände auf Eingänge von Verstärkern, die an ihren Ausgängen zugeordnete Relais zum Gangschalten mindestens einer niedrigen und mehrerer höherer Gangstufen betätigen.The converted control signal acts via specified resistors Inputs of amplifiers, the relays assigned to their outputs for gear shifting Operate at least one low and several higher gear steps.

Die Aufgabe der Erfindung besteht darin, eine Sicherheitsschaltung zu schaffen, die verhindert, daß das Kraftfahrzeuggetriebe bei eingelegter hoher Gangstufe nicht sofort herabgeschaltet wird, wenn der Drehzahlgeber und/oder sein Steuersignal ausfallen. Ein sofortiges Herabschalten der Gänge-in dem vorgenannten Falle kann zur Zerstörung zumindestens des Kraftfahrzeuggetriebes führen.The object of the invention is to provide a safety circuit to create that prevents that Motor vehicle transmission with inserted high gear is not downshifted immediately if the speed sensor and / or its control signal fail. An immediate downshift in the aforementioned Trap can lead to the destruction of at least the motor vehicle transmission.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein Differenzverstärker mit einem seiner Eingänge und mit seinem Ausgang parallel geschaltet wird zu dem Frequenzanalogwandler und der zweite Eingang an den Ausgang des zugeordneten Verstärkers für niedrige Schaltstufen angeschlossen ist und dadurch, daß der Differenzverstärker so ausgeführt ist, daß er bei Ausfall des Steuersignales eine gegenüber dem normalen Betriebszustand - wenn das Steuersignal ansteht - erhöhte Spannung am Ausgang liefert, die ein Abschalten in eine niedrigere Gangstufe verhindert.This object is achieved according to the invention in that a differential amplifier with one of its inputs and with its output is connected in parallel to the Frequency analog converter and the second input to the output of the assigned amplifier for low switching steps is connected and in that the differential amplifier is designed in such a way that if the control signal fails, it has an opposite to the normal Operating state - when the control signal is present - supplies increased voltage at the output, which prevents switching off in a lower gear.

Dabei ist die Schaltungsanordnung so getroffen, daß diese sogenannte Geber-Kontrolle durch den Differenzverstärker erst dann beginnt, wenn die erste Schaltstufe bereits geschaltet hat.The circuit arrangement is made so that this so-called Encoder control by the differential amplifier only begins when the first Has already switched.

Die erfindungsgemäße Sicherheitsschaltung wird am Schaltschema der Figuren näher erläutert.The safety circuit according to the invention is based on the circuit diagram of Figures explained in more detail.

Der Drehzahlgeber 1 an der Abtriebsseite eines nicht dargestellten Kraftfahrzeuggetriebes ist über die Leitung 2 an den Eingang des Frequenzanalogwandlers 3 angeschlossen. Die Ausgangsseite des Frequenzanalogwandlers liefert eine analoge Spannung über die Leitung 4 und die Widerstände 5 und 6 an die Eingänge der Verstärker 7 und 8 für Schaltstufen des 2. bis 3. und 3. bis 4. Ganges sowie an den Eingang des Verstärkers 9 für die niedrige Sicherheitsschaltstufe. Uber einen Lastschalter 10 kann zusätzlich an die Verstärker 7 und 8 eine Spannung angelegt und der Schaltpunkt verändert werden. Der Verstärker 9 wirkt ausgangsseitig auf ein sogenanntes ODER-Element 20, das zugleich mit dem Schalthebel 11 eines Vorwahlschalters verbunden ist und an seinem Ausgang auf einen Verstärker 12 wirkt, der zum zeitabhängigen Steuern der Wandler-Kupplung mittels des Relais 13 dient.The speed sensor 1 on the output side of a not shown Motor vehicle transmission is via line 2 to the input of the frequency analog converter 3 connected. The output side of the frequency analog converter provides an analog one Voltage via line 4 and resistors 5 and 6 to the inputs of the amplifier 7 and 8 for switching levels of 2nd to 3rd and 3rd to 4th gear as well as to the input of the amplifier 9 for the low safety switching stage. Via a load switch 10, a voltage can also be applied to the amplifiers 7 and 8 and the switching point to be changed. The amplifier 9 acts on the output side on a so-called OR element 20, which is also connected to the switching lever 11 of a preselector switch and acts at its output on an amplifier 12, which is used for time-dependent control the converter clutch by means of the relay 13 is used.

Die Ausgänge der Verstärker 7 und 8 sind an Relais 14 und 15 angeschlossen, die zum Gangschalten der Gangstufen dienen.The outputs of amplifiers 7 and 8 are connected to relays 14 and 15, which are used to shift gears.

Die Sicherheitsschaltung der Erfindung hat einen Differenzverstärker 16, der mit seinem einen Eingang 17 und seinem Ausgang 18 parallel geschaltet ist zum Frequenzanalogwandler 3. Der zweite Eingang 19 des Differenzverstärkers 16 ist an den Ausgang 21 des Verstärkers 9 für die Sicherheitsschaltstufe angeschlossen.The safety circuit of the invention has a differential amplifier 16, the one with its one entrance 17 and its Output 18 in parallel is connected to the frequency analog converter 3. The second input 19 of the differential amplifier 16 is connected to the output 21 of the amplifier 9 for the safety switching stage.

Im normalen Betriebszustand wirken am Differenzverstärker 16 die Spannungen u1 der Leitung 23 und u2 der Leitung 22, wenn der Drehzahlgeber 1 in Betrieb ist, derart, daß am Ausgang des Differenzverstärkers 16 an der Leitung 18 keine Spannung ansteht. Der Differenzverstärker ist so ausgefUhrt, daß er beim Ausfall der Spannung u1 der Leitung 4 im Schaltpunkt 24 eine Spannung liefert, die höher ist als die im normalen Betriebszustand anstehende Spannung, und damit ein Zurückschalten in niedrigere Gangstufen verhindert.In the normal operating state, the voltages act on the differential amplifier 16 u1 of line 23 and u2 of line 22 when the speed sensor 1 is in operation, such that at the output of the differential amplifier 16 on the line 18 there is no voltage pending. The differential amplifier is designed in such a way that in the event of a voltage failure u1 of line 4 at switching point 24 supplies a voltage which is higher than that Voltage present in the normal operating state, and thus a switch back to prevents lower gears.

Claims (1)

P a t e n t a n s p r u c h:P a t e n t a n s p r u c h: 1. Schaltungsanordnung einer elektronisch gesteuerten automatischen Gangschaltung für Kraftfahrzeuggetriebe, in der ein Drehzahlgeber an der Abtriebsseite des Kraftfahrzeuggetriebes ein frequenz- und amplitudenabhängiges Steuersignal liefert, das in einem Frequenzanalogwandler umgewandelt wird und von dort aus über vorgeschaltete Widerstände auf Eingänge von Schaltverstärkern wirkt, die an ihren Ausgängen zugeordnete Relais zum Gangschalten eines niedrigen und mehrerer höherer Gangstufen betätigen, dadurch gekennzeichnet, daß ein Differenzverstärker (16) mit dem einen Eingang (17) und dem Ausgang (18) parallel geschaltet zum Frequenzanalogwandler (7) und mit dem zweiten Eingang (19) an den Ausgang des Verstärkers der Sicherheitsschaltstufe (9) angeschlossen ist und daß der Differenzverstärker (16) bei Ausfall des Steuersignals eine gegenüber dem Betriebszustand mit arbeitendem Drehzahlgeber erhöhte Spannung den Schaltverstärkern zuführt.1. Circuit arrangement of an electronically controlled automatic Gear shift for motor vehicle transmissions, in which a speed sensor on the output side the motor vehicle transmission supplies a frequency and amplitude-dependent control signal, which is converted in a frequency analog converter and from there via upstream Resistors acts on inputs of switching amplifiers, which are assigned to their outputs Operate relay for gear shifting one low and several higher gear steps, characterized in that a differential amplifier (16) with one input (17) and the output (18) connected in parallel to the frequency analog converter (7) and with the second input (19) to the output of the amplifier of the safety switching stage (9) is connected and that the differential amplifier (16) in the event of failure of the control signal an increased voltage compared to the operating state with a working speed sensor feeds the switching amplifiers. L e e r s e i t eL e r s e i t e
DE19712123700 1971-05-13 1971-05-13 Safety circuit for automatic motor vehicle transmissions Pending DE2123700A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19712123700 DE2123700A1 (en) 1971-05-13 1971-05-13 Safety circuit for automatic motor vehicle transmissions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712123700 DE2123700A1 (en) 1971-05-13 1971-05-13 Safety circuit for automatic motor vehicle transmissions

Publications (1)

Publication Number Publication Date
DE2123700A1 true DE2123700A1 (en) 1972-11-16

Family

ID=5807730

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19712123700 Pending DE2123700A1 (en) 1971-05-13 1971-05-13 Safety circuit for automatic motor vehicle transmissions

Country Status (1)

Country Link
DE (1) DE2123700A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2352939A1 (en) * 1973-10-23 1975-04-30 Bosch Gmbh Robert HYDRAULIC CONTROL DEVICE
DE3137910A1 (en) * 1980-09-24 1982-04-15 Aisin Seiki K.K., Kariya, Aichi SAFETY CIRCUIT FOR AN AUTOMATIC TRANSMISSION CONTROL SYSTEM

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2352939A1 (en) * 1973-10-23 1975-04-30 Bosch Gmbh Robert HYDRAULIC CONTROL DEVICE
DE3137910A1 (en) * 1980-09-24 1982-04-15 Aisin Seiki K.K., Kariya, Aichi SAFETY CIRCUIT FOR AN AUTOMATIC TRANSMISSION CONTROL SYSTEM

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