WO2023202892A1 - Automatic transmission with converter and the control of the converter - Google Patents

Automatic transmission with converter and the control of the converter Download PDF

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Publication number
WO2023202892A1
WO2023202892A1 PCT/EP2023/059117 EP2023059117W WO2023202892A1 WO 2023202892 A1 WO2023202892 A1 WO 2023202892A1 EP 2023059117 W EP2023059117 W EP 2023059117W WO 2023202892 A1 WO2023202892 A1 WO 2023202892A1
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WO
WIPO (PCT)
Prior art keywords
converter
pressure
valve
automatic transmission
inlet valve
Prior art date
Application number
PCT/EP2023/059117
Other languages
German (de)
French (fr)
Inventor
Christoph Wurster
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Voith Patent Gmbh
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Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2023202892A1 publication Critical patent/WO2023202892A1/en

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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
    • F16H61/02—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 characterised by the signals used
    • F16H61/0262—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 characterised by the signals used the signals being hydraulic
    • F16H61/0265—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 characterised by the signals used the signals being hydraulic for gearshift control, e.g. control functions for performing shifting or generation of shift signals
    • F16H61/0267—Layout of hydraulic control circuits, e.g. arrangement of valves
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • 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
    • F16H61/0021—Generation or control of line pressure

Definitions

  • the invention relates to an automatic transmission with a converter, the converter being integrated into the oil circuit of the automatic transmission.
  • the invention further relates to the regulation of the converter.
  • Automatic transmissions or automated manual transmissions usually have an oil pump in an oil supply line, by means of which oil is conveyed from an oil sump into a pressure line for supplying pressure oil to elements of the transmission.
  • the oil pump is driven by the internal combustion engine or electric motor, with which drive power is fed into a motor vehicle drive train in which the transmission with the oil supply is provided in order to transmit drive power from the internal combustion engine to the drive wheels of the motor vehicle.
  • the oil pump is positioned in the transmission.
  • the pump could also be driven by an electric machine and the speed or volume flow could be controlled separately.
  • DE 10 2009 035 082 A1 discloses a transmission oil circuit with an oil pump, a hydrodynamic converter, a hydrodynamic retarder, a retarder heat exchanger, controllable switching valves and a heat exchanger.
  • the converter outlet is closed when operating in 1st gear, i.e. when the converter is in the power flow. Oil exchange and thus cooling of the converter only takes place through the converter's leakage gap, which is fed directly and uncooled into the oil sump.
  • the converter is regulated to a low pressure to reduce the power loss.
  • the amount of cooling oil through the converter corresponds to only a subset of the amount delivered by the transmission-internal oil pump.
  • Another transmission oil circuit for an automatic transmission with a converter is known from WO 2017/050674 A1.
  • the converter is integrated into the pressure line of the transmission oil circuit, so that in converter operation and in non-converter operation there is always a volume flow through the converter and further through one Cooler is guided before the oil returns to the oil sump.
  • the converter is regulated via several valves.
  • a hydraulic system for controlling and regulating an automatic transmission with a converter is known.
  • a proportional valve is arranged at the converter inlet and a differential pressure valve is arranged at the converter outlet, which are connected via a control line, the proportional valve being controlled via a second control line 17 and the differential pressure valve 14 being controlled via a further control line.
  • the converter inlet pressure and converter outlet pressure are carried out via different control variables.
  • the object of the invention is to change the integration of the converter in such a way that the functionality of the converter is improved.
  • the invention relates to an automatic transmission with a converter, the converter being integrated into the oil circuit of the automatic transmission, comprising a pump arranged in a pressure line for providing an oil volume flow with a supply pressure p1, a converter inlet valve, a converter outlet valve and a proportional valve for providing a control pressure p2 via a Control channel.
  • the converter inlet valve and the converter outlet valve can be switched or regulated by means of the control pressure p2 provided by the proportional valve, with a control channel being provided between the converter inlet valve and the converter outlet valve, via which the control pressure p2 is only activated for switching the converter outlet valve if by means of the control pressure p2 the converter inlet valve has been switched from a basic position to a converter operating position. Without switching the converter inlet valve, the converter outlet valve cannot be regulated. In the basic position of the converter inlet and converter outlet valve, the converter is completely switched out of the oil circuit, so that the delivery volume of the transmission-internal oil pump can be reduced. As soon as the converter of the automatic transmission is bridged, the idle losses of the converter are eliminated. Only in converter operation is an oil flow passed through the converter.
  • the converter inlet valve is preferably a pressure-controlled 7/2-way valve with spring return, which can further be switched into the converter operating position by means of the control pressure p2 against a spring force of the spring return.
  • the converter inlet valve is designed such that the pressure line can be connected to a bypass channel in the basic position of the converter inlet valve and to the converter in the converter operating position of the converter inlet valve. In the basic position of the converter inlet valve, the entire oil volume flow is guided past the converter via the bypass channel.
  • control channel can be connected to the pressure line in the basic position of the converter inlet valve and to the control channel in the converter operating position of the converter inlet valve.
  • the converter outlet valve In its basic position, the converter outlet valve is in a closed position and can be acted upon by the control pressure p2 on the spring side and by the supply pressure p1 on the opposite side.
  • the converter outlet valve is switched into the closed position using a composite force of supply pressure p1 or control pressure p2 and spring force of the spring return and into the open position using the supply pressure p1.
  • a bridging channel with a throttle for flow control can be provided parallel to the converter outlet valve. Through this bridging channel, an oil volume flow can be constantly removed from the converter and thus improved oil cooling of the converter can be achieved.
  • Another function of the converter inlet valve is that the converter can be drained in the basic position via the converter inlet valve or is depressurized.
  • a method for controlling an automatic transmission with a converter in which the converter inlet valve is designed such that the switch to a converter operating position takes place as soon as a control pressure p2 provided by the proportional valve is present, and that the converter outlet valve is designed such that The switching to the open position only takes place if the supply pressure p1 is greater than the sum of the forces from the spring force of the spring return of the converter outlet valve and the switching force of the control pressure p2.
  • FIG. 2 a corresponding oil supply with all oil consumers of an automatic transmission is shown in Figure 2.
  • the structure includes a converter inlet valve immediately before and a converter outlet valve immediately after the converter, with reference being made to the description of the publication for the function.
  • oil is removed from the oil pan 1 during operation of the automatic transmission
  • the supply pressure p1 in front of the converter inlet valve 6 or the converter 4 differs from the pressure p3, the converter pressure in front of the converter outlet valve 7, whereby the converter pressure p3 depends heavily on the speed and filling of the converter 4.
  • the control pressure p2 provided by the proportional valve 5 acts directly on the converter inlet valve 6 and indirectly via the converter inlet valve 6 on the converter outlet valve 7.
  • the control pressure p2 acts against the compression spring of the spring return. If the control pressure p2 is smaller than the limit value (plimit_x_WEV), the converter inlet valve 6 is moved into the basic position, the converter emptying position, by the spring return. In the basic position, the converter 4 is connected directly to the oil sump 1 and is thus emptied, with the oil volume flow coming from the pump 3 being directed past the converter 4 via a bypass channel 11.
  • a heat exchanger 9 is provided in the further course of the oil volume flow, through which the oil temperature is reduced before further use in the oil circuit.
  • control pressure p2 is greater than the limit value (plimit_x_WEV)
  • the converter inlet valve 6 is moved into the converter operating position, the control pressure p2 opens the converter inlet valve 6 against the compression spring.
  • the pressure channel 2 is connected directly to the converter 4 and the converter outlet valve 7 is pressurized with the control pressure p2.
  • the converter outlet valve 7 is a pressure-controlled 2/2-way valve with spring return, with the basic position being the closed position. This closed position is ensured by applying the supply pressure p1, which is released in the basic position via the converter inlet valve 6.
  • the converter output valve 7 is also indirectly acted upon with the control pressure p2, which, together with the spring return, moves or holds the converter outlet valve 7 into the closed position. Only when the supply pressure p1 is greater than the spring force and the control pressure p2 combined does the converter outlet valve 7 switch to the open position, so that the converter 4 is flowed through. This allows the converter pressure to be modulated using the control pressure d2. In addition, active after-cooling of the converter 4 is made possible and, if necessary, the converter 4 can also be cooled and/or lubricated when the converter is at a standstill.
  • the bridging channel 12 is provided so that a definable oil volume flow always flows through the converter 4.
  • the bridging channel 12 ensures that a defined oil volume flow always flows through the converter 4 back into the oil sump or the oil pan 1.
  • the throttle 10 in the bridging channel 12 controls this oil volume flow.
  • the converter is thus placed in the main volume flow and, in the open position of the converter outlet valve 7, the entire delivery rate of the oil pump flows through it, as long as the converter outlet valve 7 is switched to the open position, i.e. the supply pressure p1 is greater than the forces of the spring return of the converter outlet valve 7 and the control pressure p2 together. This prevents the oil from heating up in converter operation, the operating point in 1st gear.
  • the proportional valve 5 can be controlled accordingly Control pressure p2 of the converter can still be switched into the main volume flow so that recooling can be achieved.
  • the entire volume flow from pump 3 is directed via bypass 11, which leads to a reduction in the power loss of the automatic transmission.
  • the oil heated by the converter is no longer passed directly into the sump, but first through the heat exchanger with a high delta_t, which improves efficiency.

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

Abstract

The invention relates to an automatic transmission having a converter, wherein the converter is incorporated into the oil circuit of the automatic transmission, comprising a pump arranged in a pressure line for providing an oil volume flow with a supply pressure p1, a converter inlet valve, a converter outlet valve and a proportional valve for providing a control pressure p2 via a control channel. According to the invention, the converter inlet valve and the converter outlet valve can be switched by means of the control pressure p2 provided by the proportional valve, wherein a control channel is provided between the converter inlet valve and the converter outlet valve, via which the control pressure p2 is only released for switching the converter outlet valve when the switching of the converter inlet valve from a neutral position to a converter operating position has been effected by means of the control pressure p2.

Description

Automatgetriebe mit Wandler und die Regelung des Wandlers Automatic transmission with converter and the regulation of the converter
Die Erfindung betrifft ein Automatgetriebe mit Wandler, wobei der Wandler in den Ölkreislauf des Automatgetriebes eingebunden ist. Weiterhin betrifft die Erfindung die Regelung des Wandlers. The invention relates to an automatic transmission with a converter, the converter being integrated into the oil circuit of the automatic transmission. The invention further relates to the regulation of the converter.
Automatgetriebe oder auch automatisierte Schaltgetriebe weisen herkömmlich eine Ölpumpe in einer Ölversorgungsleitung auf, mittels welcher Öl aus einem Ölsumpf in eine Druckleitung zur Druckölversorgung von Elementen des Getriebes gefördert wird. Die Ölpumpe wird durch den Verbrennungsmotor oder E-Motor angetrieben, mit welchem Antriebsleistung in einen Kraftfahrzeugantriebsstrang, in dem das Getriebe mit der Ölversorgung vorgesehen ist, um Antriebsleistung des Verbrennungsmotors auf Antriebsräder des Kraftfahrzeugs zu übertragen, eingespeist wird. In der Regel ist die Ölpumpe im Getriebe positioniert. Die Pumpe könnte aber auch von einer E-Maschine angetrieben werden und separat Drehzahl oder Volumenstrom geregelt sein. Automatic transmissions or automated manual transmissions usually have an oil pump in an oil supply line, by means of which oil is conveyed from an oil sump into a pressure line for supplying pressure oil to elements of the transmission. The oil pump is driven by the internal combustion engine or electric motor, with which drive power is fed into a motor vehicle drive train in which the transmission with the oil supply is provided in order to transmit drive power from the internal combustion engine to the drive wheels of the motor vehicle. As a rule, the oil pump is positioned in the transmission. The pump could also be driven by an electric machine and the speed or volume flow could be controlled separately.
DE 10 2009 035 082 A1 offenbart einen Getriebeölkreislauf mit einer Ölpumpe, einem hydrodynamischen Wandler, einem hydrodynamischen Retarder, einem Retarderwärmetauscher, steuerbare Schaltventile und einem Wärmetauscher. In dieser Ausführung ist der Wandlerauslass beim Betrieb des 1. Gangs, also wenn der Wandler im Leistungsfluss ist, verschlossen. Ölaustausch und somit Kühlung des Wandlers erfolgt nur durch Leckagespalte des Wandlers, welches direkt und ungekühlt in den Öl- Sumpf geleitet wird. In den mechanischen Gängen, also wenn der Wandler nicht im Leistungsfluss ist, wird der Wandler zur Reduzierung der Verlustleistung auf einen geringen Druck eingeregelt. In beiden Betriebspunkten entspricht die Kühlölmenge durch den Wandler nur einer Teilmenge der von der getriebeinternen Ölpumpe geförderten Menge. DE 10 2009 035 082 A1 discloses a transmission oil circuit with an oil pump, a hydrodynamic converter, a hydrodynamic retarder, a retarder heat exchanger, controllable switching valves and a heat exchanger. In this version, the converter outlet is closed when operating in 1st gear, i.e. when the converter is in the power flow. Oil exchange and thus cooling of the converter only takes place through the converter's leakage gap, which is fed directly and uncooled into the oil sump. In the mechanical gears, i.e. when the converter is not in the power flow, the converter is regulated to a low pressure to reduce the power loss. At both operating points, the amount of cooling oil through the converter corresponds to only a subset of the amount delivered by the transmission-internal oil pump.
Aus der WO 2017 / 050674 A1 ist ein weiterer Getriebeölkreislauf für ein Automatgetriebe mit Wandler bekannt. Dabei ist der Wandler in der Druckleitung des Getriebeölkreislaufs eingebunden, so dass im Wandlerbetrieb und im Nicht- Wandlerbetrieb immer ein Volumenstrom durch den Wandler und weiter durch einen Kühler geführt wird, bevor das Öl zurück in den Ölsumpf gelangt. Die Regelung des Wandlers erfolgt über mehrere Ventile. Another transmission oil circuit for an automatic transmission with a converter is known from WO 2017/050674 A1. The converter is integrated into the pressure line of the transmission oil circuit, so that in converter operation and in non-converter operation there is always a volume flow through the converter and further through one Cooler is guided before the oil returns to the oil sump. The converter is regulated via several valves.
Aus der DE 101 10 374 A1 ist ein Hydrauliksystem zur Steuerung und Regelung eines Automatgetriebes mit einem Wandler bekannt. Am Wandlereinlass ist ein Proportionalventil und am Wandlerauslass ist ein Differenzdruckventil angeordnet, die über eine Steuerleitung verbunden sind, wobei die Regelung des Proportionalventils über eine zweite Steuerleitung 17 und die Regelung des Differenzdruckventils 14 über eine weitere Steuerleitung erfolgt. Wandlereinlassdruck und Wandlerauslassdruck erfolgt über unterschiedliche Regelgrößen. From DE 101 10 374 A1 a hydraulic system for controlling and regulating an automatic transmission with a converter is known. A proportional valve is arranged at the converter inlet and a differential pressure valve is arranged at the converter outlet, which are connected via a control line, the proportional valve being controlled via a second control line 17 and the differential pressure valve 14 being controlled via a further control line. The converter inlet pressure and converter outlet pressure are carried out via different control variables.
Die Aufgabe der Erfindung ist es, die Einbindung des Wandlers in der Art zu verändern, dass die Funktionalität des Wandlers verbessert wird. The object of the invention is to change the integration of the converter in such a way that the functionality of the converter is improved.
Die Aufgabe wird erfindungsgemäß durch eine Ausführung entsprechend dem unabhängigen Anspruch und dem Verfahren gelöst. Weitere vorteilhafte Ausführungsformen der vorliegenden Erfindung finden sich in den Unteransprüchen. The object is achieved according to the invention by an embodiment according to the independent claim and the method. Further advantageous embodiments of the present invention can be found in the subclaims.
Die Erfindung betrifft ein Automatgetriebe mit Wandler, wobei der Wandler in den Ölkreislauf des Automatgetriebes eingebunden ist, umfassend eine in einer Druckleitung angeordnete Pumpe zur Bereitstellung eines Ölvolumenstroms mit einem Versorgungsdruck p1 , ein Wandlereinlassventil, ein Wandlerauslassventil und ein Proportionalventil zur Bereitstellung eines Steuerdrucks p2 über einen Steuerkanal. The invention relates to an automatic transmission with a converter, the converter being integrated into the oil circuit of the automatic transmission, comprising a pump arranged in a pressure line for providing an oil volume flow with a supply pressure p1, a converter inlet valve, a converter outlet valve and a proportional valve for providing a control pressure p2 via a Control channel.
Erfindungsgemäß wird vorgeschlagen, dass das Wandlereinlassventil und das Wandlerauslassventil mittels des vom Proportionalventil bereitgestellten Steuerdrucks p2 schaltbar oder regelbar sind, wobei ein Ansteuerkanal zwischen Wandlereinlassventil und Wandlerauslassventil vorgesehen ist, über den der Steuerdruck p2 nur dann zur Schaltung des Wandlerauslassventils freigeschaltet ist, wenn mittels des Steuerdrucks p2 die Schaltung des Wandlereinlassventils von einer Grundstellung in eine Wandlerbetriebsstellung erfolgt ist. Ohne die Schaltung des Wandlereinlassventils kann keine Regelung des Wandlerauslassventils erfolgen. In der Grundstellung von Wandlereinlass- und Wandlerauslassventil ist der Wandler komplett aus dem Ölkreislauf geschaltet, so dass das Fördervolumen der getriebeinternen Ölpumpe reduziert werden kann. Sobald der Wandler des Automatgetriebes überbrückt wird, entfallen so die Leerlaufverluste des Wandlers. Nur im Wandlerbetrieb wird ein Ölstrom über den Wandler geleitet. According to the invention, it is proposed that the converter inlet valve and the converter outlet valve can be switched or regulated by means of the control pressure p2 provided by the proportional valve, with a control channel being provided between the converter inlet valve and the converter outlet valve, via which the control pressure p2 is only activated for switching the converter outlet valve if by means of the control pressure p2 the converter inlet valve has been switched from a basic position to a converter operating position. Without switching the converter inlet valve, the converter outlet valve cannot be regulated. In the basic position of the converter inlet and converter outlet valve, the converter is completely switched out of the oil circuit, so that the delivery volume of the transmission-internal oil pump can be reduced. As soon as the converter of the automatic transmission is bridged, the idle losses of the converter are eliminated. Only in converter operation is an oil flow passed through the converter.
Vorzugsweise ist das Wandlereinlassventil ein druckgesteuertes 7/2 Wegeventil mit Federrückstellung, welches weiterhin mittels des Steuerdrucks p2 gegen eine Federkraft der Federrückstellung in die Wandlerbetriebsstellung geschaltet werden kann. The converter inlet valve is preferably a pressure-controlled 7/2-way valve with spring return, which can further be switched into the converter operating position by means of the control pressure p2 against a spring force of the spring return.
Weiterhin ist das Wandlereinlassventil derart ausgeführt, dass die Druckleitung in der Grundstellung des Wandlereinlassventils mit einem Bypasskanal und in der Wandlerbetriebsstellung des Wandlereinlassventils mit dem Wandler verbindbar ist. Über den Bypasskanal wird in der Grundstellung des Wandlereinlassventils der gesamte Ölvolumenstrom an dem Wandler vorbeigeführt. Furthermore, the converter inlet valve is designed such that the pressure line can be connected to a bypass channel in the basic position of the converter inlet valve and to the converter in the converter operating position of the converter inlet valve. In the basic position of the converter inlet valve, the entire oil volume flow is guided past the converter via the bypass channel.
In einer bevorzugten Ausführung ist der Ansteuerkanal in der Grundstellung des Wandlereinlassventils mit der Druckleitung und in der Wandlerbetriebsstellung des Wandlereinlassventils mit dem Steuerkanal verbindbar. Das Wandlerauslassventil befindet sich in seiner Grundstellung in einer Schließstellung und ist auf der Federseite mit dem Steuerdruck p2 beaufschlagbar und auf der gegenüberliegenden Seite mit dem Versorgungsdruck p1. Die Schaltung des Wandlerauslassventils erfolgt mittels einer zusammengesetzten Kraft aus Versorgungsdruck p1 oder Steuerdruck p2 und Federkraft der Federrückstellung in die Schließstellung und mittels dem Versorgungsdruck p1 in die Offenstellung. In a preferred embodiment, the control channel can be connected to the pressure line in the basic position of the converter inlet valve and to the control channel in the converter operating position of the converter inlet valve. In its basic position, the converter outlet valve is in a closed position and can be acted upon by the control pressure p2 on the spring side and by the supply pressure p1 on the opposite side. The converter outlet valve is switched into the closed position using a composite force of supply pressure p1 or control pressure p2 and spring force of the spring return and into the open position using the supply pressure p1.
In der Offenstellung des Wandlerauslassventils wird der Wandlerdruck reduziert, so dass eine Modelierung des Wandlerdrucks über die Regelung des Steuerdrucks ermöglicht wird. Weiterhin kann ein Überbrückungskanal mit einer Drossel zur Durchflussregelung parallel zum Wandlerauslassventil vorgesehen sein. Durch diesen Überbrückungskanal kann ständig ein Ölvolumenstrom aus dem Wandler abgeführt werden und so eine verbesserte Ölkühlung des Wandlers erreicht werden. When the converter outlet valve is in the open position, the converter pressure is reduced, allowing the converter pressure to be modeled by regulating the control pressure. Furthermore, a bridging channel with a throttle for flow control can be provided parallel to the converter outlet valve. Through this bridging channel, an oil volume flow can be constantly removed from the converter and thus improved oil cooling of the converter can be achieved.
Eine weitere Funktion des Wandlereingangsventils ist es, dass der Wandler über das Wandlereingangsventil in der Grundstellung entleerbar ist oder drucklos geschaltet ist. Another function of the converter inlet valve is that the converter can be drained in the basic position via the converter inlet valve or is depressurized.
Weiterhin wird ein Verfahren zur Regelung eines Automatgetriebes mit einem Wandler entsprechend der Beschreibung vorgeschlagen, bei dem das Wandlereinlassventil derart ausgelegt ist, dass die Schaltung in eine Wandlerbetriebsstellung erfolgt sobald ein vom dem Proportionalventil bereitgestellter Steuerdruck p2 anliegt, und dass das Wandlerauslassventil derart ausgelegt ist, dass die Schaltung in die Offenstellung nur erfolgt, wenn der Versorgungsdruck p1 größer ist als die Summe der Kräfte aus Federkraft der Federrückstellung des Wandlerauslassventils und Schaltkraft des Steuerdrucks p2. Furthermore, a method for controlling an automatic transmission with a converter according to the description is proposed, in which the converter inlet valve is designed such that the switch to a converter operating position takes place as soon as a control pressure p2 provided by the proportional valve is present, and that the converter outlet valve is designed such that The switching to the open position only takes place if the supply pressure p1 is greater than the sum of the forces from the spring force of the spring return of the converter outlet valve and the switching force of the control pressure p2.
Im Folgenden wird die Erfindung anhand von Figur 1 erläutert. Diese zeigt einen Ausschnitt einer Ölversorgung eines Automatgetriebes mit Wandler 4 und den Ventilen zur Regelung des Wandlers 4. Der Ausschnitt zeigt somit den Teil der Ölversorgung eines Automatgetriebes der für die Regelung des Wandlers 4 relevant ist. Für die Regelung des Wandlers 4 sind die Ventile 5, 6, 7 notwendig. The invention is explained below with reference to Figure 1. This shows a section of an oil supply of an automatic transmission with converter 4 and the valves for controlling the converter 4. The section therefore shows the part of the oil supply of an automatic transmission that is relevant for the control of the converter 4. The valves 5, 6, 7 are necessary to control the converter 4.
Weitere Details einer Ölversorgung für ein Automatgetriebe sind aus der bereits zitierten EP 3 353 452 A1 bekannt. Hier wird in Figur 2 eine entsprechende Ölversorgung mit allen Ölverbrauchern eines Automatgetriebes dargestellt. Der Aufbau umfasst ein Wandlereinlassventil unmittelbar vor und ein Wandlerauslassventil unmittelbar hinter dem Wandler, wobei bezüglich der Funktion auf die Beschreibung der Veröffentlichung verwiesen wird. Further details of an oil supply for an automatic transmission are known from the already cited EP 3 353 452 A1. Here, a corresponding oil supply with all oil consumers of an automatic transmission is shown in Figure 2. The structure includes a converter inlet valve immediately before and a converter outlet valve immediately after the converter, with reference being made to the description of the publication for the function.
Erfindungsgemäß wird beim Betrieb des Automatgetriebes Öl aus der Ölwanne 1 , dieAccording to the invention, oil is removed from the oil pan 1 during operation of the automatic transmission
Getriebeölwanne, mittels der Pumpe 3 in die Druckleitung 2 gefördert. Der Druck p an dieser Stelle ist der Pumpendruck. Im weiteren Verlauf des Druckkanals 2 sind unter anderem das Wandlereinlassventil 6, der Wandler 4 und das Wandlerauslassventil 7 angeordnet, wobei die unterschiedlichen Drücke p und p1 dadurch zu erklären sind, dass vor dem Wandlereinlassventil 6 andere nicht dargestellte Ölverbraucher angeschlossen sind oder sein können. Transmission oil pan, conveyed into the pressure line 2 by means of the pump 3. The pressure p on This point is the pump pressure. In the further course of the pressure channel 2, among other things, the converter inlet valve 6, the converter 4 and the converter outlet valve 7 are arranged, the different pressures p and p1 being explained by the fact that other oil consumers, not shown, are or can be connected in front of the converter inlet valve 6.
Dabei ist festzuhalten, dass der Versorgungsdruck p1 vor dem Wandlereinlassventil 6 bzw. dem Wandler 4 sich von dem Druck p3, dem Wandlerdruck vor dem Wandlerauslassventil 7, unterscheidet, wobei der Wandlerdruck p3 stark von der Drehzahl und Füllung des Wandlers 4 abhängt. It should be noted that the supply pressure p1 in front of the converter inlet valve 6 or the converter 4 differs from the pressure p3, the converter pressure in front of the converter outlet valve 7, whereby the converter pressure p3 depends heavily on the speed and filling of the converter 4.
Der vom Proportionalventil 5 bereitgestellte Steuerdruck p2 wirkt direkt auf das Wandlereinlassventil 6 und indirekt über das Wandlereinlassventil 6 auf das Wandlerauslassventil 7. The control pressure p2 provided by the proportional valve 5 acts directly on the converter inlet valve 6 and indirectly via the converter inlet valve 6 on the converter outlet valve 7.
Durch die Ansteuerung des Wandlereinlassventils 6, ein druckgesteuertes 7/2 Wegeventil mit Federrückstellung, wirkt der Steuerdruck p2 gegen die Druckfeder der Federrückstellung. Ist der Steuerdruck p2 kleiner als der Grenzwert (pGrenz_x_WEV), so wird das Wandlereinlassventil 6 durch die Federrückstellung in die Grundstellung, der Wandlerentleerstellung, bewegt. In der Grundstellung wird der Wandler 4 direkt mit dem Ölsumpf 1 verbunden und so entleert, wobei der Ölvolumenstrom, kommend von der Pumpe 3, über einen Bypasskanal 11 an dem Wandler 4 vorbeigeleitet wird. By activating the converter inlet valve 6, a pressure-controlled 7/2-way valve with spring return, the control pressure p2 acts against the compression spring of the spring return. If the control pressure p2 is smaller than the limit value (plimit_x_WEV), the converter inlet valve 6 is moved into the basic position, the converter emptying position, by the spring return. In the basic position, the converter 4 is connected directly to the oil sump 1 and is thus emptied, with the oil volume flow coming from the pump 3 being directed past the converter 4 via a bypass channel 11.
Wie in Fig 1 dargestellt, ist im weiteren Verlauf des Ölvolumenstroms ein Wärmetauscher 9 vorgesehen, durch den die Öltemperatur vor der weiteren Nutzung im Ölkreislauf gesenkt wird. As shown in Fig. 1, a heat exchanger 9 is provided in the further course of the oil volume flow, through which the oil temperature is reduced before further use in the oil circuit.
Ist der Steuerdruck p2 größer als der Grenzwert (pGrenz_x_WEV), so wird das Wandlereinlassventil 6 in die Wandlerbetriebsstellung bewegt, der Steuerdruck p2 öffnet das Wandlereinlassventil 6 gegen die Druckfeder. In der Wandlerbetriebsstellung wird der Druckkanal 2 direkt mit dem Wandler 4 verbunden und das Wandlerauslassventil 7 wird mit dem Steuerdruck p2 beaufschlagt. Das Wandlerauslassventil 7 ist ein druckgeregeltes 2/2 Wegeventil mit Federrückstellung, wobei die Grundstellung die Schließstellung ist. Diese Schließstellung wird durch die Beaufschlagung der mit dem Versorgungsdruck p1 , welcher über das Wandlereinlassventil 6 in der Grundstellung freigegeben wird, sichergestellt. If the control pressure p2 is greater than the limit value (plimit_x_WEV), the converter inlet valve 6 is moved into the converter operating position, the control pressure p2 opens the converter inlet valve 6 against the compression spring. In the converter operating position, the pressure channel 2 is connected directly to the converter 4 and the converter outlet valve 7 is pressurized with the control pressure p2. The converter outlet valve 7 is a pressure-controlled 2/2-way valve with spring return, with the basic position being the closed position. This closed position is ensured by applying the supply pressure p1, which is released in the basic position via the converter inlet valve 6.
Sobald das Wandlereingangsventil 6 geschaltet wird, erfolgt indirekt auch die Beaufschlagung des Wandlerausgangsventils 7 mit dem Steuerdruck p2, der zusammen mit der Federrückstellung das Wandlerauslassventil 7 in die Schließstellung bewegt bzw. hält. Nur wenn der Versorgungsdruck p1 größer ist als die Federkraft und der Steuerdruck p2 zusammen, schaltet das Wandlerauslassventil 7 in die Offenstellung, so dass der Wandler 4 durchströmt wird. Dies ermöglicht eine Modulierung des Wandlerdrucks mittels dem Steuerdruck d2. Zudem wird eine aktive Nachkühlung des Wandlers 4 ermöglicht und der Wandler 4 kann bei Bedarf auch im Wandlerstillstand gekühlt und/oder geschmiert werden. As soon as the converter input valve 6 is switched, the converter output valve 7 is also indirectly acted upon with the control pressure p2, which, together with the spring return, moves or holds the converter outlet valve 7 into the closed position. Only when the supply pressure p1 is greater than the spring force and the control pressure p2 combined does the converter outlet valve 7 switch to the open position, so that the converter 4 is flowed through. This allows the converter pressure to be modulated using the control pressure d2. In addition, active after-cooling of the converter 4 is made possible and, if necessary, the converter 4 can also be cooled and/or lubricated when the converter is at a standstill.
Damit immer ein definierbarer Ölvolumenstrom durch den Wandler 4 strömt, ist der Überbrückungskanal 12 vorgesehen. Über den Überbrückungskanal 12 wird sichergestellt, dass immer ein definierter Ölvolumenstrom durch den Wandler 4 zurück in den Ölsumpf oder die Ölwanne 1 gelangt. Die Drossel 10 im Überbrückungskanal 12 steuert diesen Ölvolumenstrom. The bridging channel 12 is provided so that a definable oil volume flow always flows through the converter 4. The bridging channel 12 ensures that a defined oil volume flow always flows through the converter 4 back into the oil sump or the oil pan 1. The throttle 10 in the bridging channel 12 controls this oil volume flow.
Der Wandler ist somit im Hauptvolumenstrom platziert und wird in der Offenstellung des Wandlerauslassventils 7 von der kompletten Fördermenge der Ölpumpe durchströmt, solange das Wandlerauslassventil 7 in die Offenstellung geschaltet ist, also der Versorgungsdruck p1 größer ist als die Kräfte der Federrückstellung des Wandlerauslassventils 7 und des Steuerdruck p2 zusammen. So wird die Erwärmung des Öls im Wandlerbetrieb, dem Betriebspunkt 1. Gang, verhindert. The converter is thus placed in the main volume flow and, in the open position of the converter outlet valve 7, the entire delivery rate of the oil pump flows through it, as long as the converter outlet valve 7 is switched to the open position, i.e. the supply pressure p1 is greater than the forces of the spring return of the converter outlet valve 7 and the control pressure p2 together. This prevents the oil from heating up in converter operation, the operating point in 1st gear.
Weiterhin kann im mechanischen Gang des Getriebes, in dem der Wandler 4 überbrückt ist, durch entsprechende Ansteuerung des Proportionalventils 5 der Steuerdruck p2 der Wandler weiterhin in den Hauptvolumenstrom geschaltet werden, so dass eine Rückkühlung realisierbar ist. Bei der Überbrückung wird der komplette Volumenstrom von der Pumpe 3 über den Bypass 11 geleitet, was zur Reduzierung der Verlustleistung des Automatgetriebes führt. Furthermore, in the mechanical gear of the transmission, in which the converter 4 is bridged, the proportional valve 5 can be controlled accordingly Control pressure p2 of the converter can still be switched into the main volume flow so that recooling can be achieved. When bridging, the entire volume flow from pump 3 is directed via bypass 11, which leads to a reduction in the power loss of the automatic transmission.
Zur Modulation des Wandlerdrucks muss lediglich der Steuerdruck p2 mittels des Proportionalventils 5 entsprechend eingestellt werden. To modulate the converter pressure, only the control pressure p2 needs to be adjusted accordingly using the proportional valve 5.
Durch die vorgeschlagene Einbindung des Wärmetauschers wird das vom Wandler erwärmte Öl nicht mehr direkt in den Sumpf, sondern zuerst mit hohem delta_t durch den Wärmetauscher geleitet, was den Wirkungsgrad verbessert. Due to the proposed integration of the heat exchanger, the oil heated by the converter is no longer passed directly into the sump, but first through the heat exchanger with a high delta_t, which improves efficiency.
Bezugszeichenliste Reference symbol list
1 Ölwanne 1 oil pan
Druckkanal pressure channel
3 Pumpe 3 pump
4 Wandler 4 converters
5 Proportionalventil 5 proportional valve
6 Wandlereinlassventil 6 Converter inlet valve
7 Wandlerauslassventil 7 converter exhaust valve
8 Ölkreislauf 8 oil circuit
9 Wärmetauscher 9 heat exchangers
10 Drossel 10 Thrush
11 Bypass 11 bypass
12 Überbrückungskanal 12 bridging channel
13 Ansteuerkanal 13 control channel
14 Steuerkanal 14 control channel
P Arbeitsdruck p1 Versorgungsdruck P working pressure p1 supply pressure
P2 Steuerdruck P2 control pressure
P3 Wandlerdruck p4 Auslassdruck P3 converter pressure p4 outlet pressure

Claims

Patentansprüche Automatgetriebe mit Wandler (4), wobei der Wandler (4) in den Ölkreislauf (8) des Automatgetriebes eingebunden ist, umfassend eine in einer Druckleitung (2) angeordnete Pumpe (3) zur Bereitstellung eines Ölvolumenstroms mit einem Versorgungsdruck p1 , ein Wandlereinlassventil (6), ein Wandlerauslassventil (7) und ein Proportionalventil (5) zur Bereitstellung eines Steuerdrucks p2 über einen Steuerkanal (14), dadurch gekennzeichnet, dass das Wandlereinlassventil (6) und das Wandlerauslassventil (7) mittels des vom Proportionalventil (5) bereitgestellten Steuerdrucks p2 schaltbar sind, wobei ein Ansteuerkanal (13) zwischen Wandlereinlassventil (6) und Wandlerauslassventil (7) vorgesehen ist, über den der Steuerdruck p2 nur dann zur Schaltung des Wandlerauslassventils (7) freigeschaltet ist, wenn mittels des Steuerdrucks p2 die Schaltung des Wandlereinlassventils (6) von einer Grundstellung in eine Wandlerbetriebsstellung erfolgt ist. Automatgetriebe nach Anspruch 1 , dadurch gekennzeichnet, dass das Wandlereinlassventil (6) ein druckgesteuertes 7/2 Wegeventil mit Federrückstellung ist. Automatgetriebe nach Anspruch 2, dadurch gekennzeichnet, dass das Wandlereinlassventil (6) mittels des Steuerdrucks p2 gegen eine Federkraft der Federrückstellung in die Wandlerbetriebsstellung schaltbar ist. Automatgetriebe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Druckleitung (2) in der Grundstellung des Wandlereinlassventils (6) mit einem Bypasskanal (11 ) und in der Wandlerbetriebsstellung des Wandlereinlassventils (6) mit dem Wandler (4) verbindbar ist. Automatgetriebe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Ansteuerkanal (13) in der Grundstellung des Wandlereinlassventils (6) mit der Druckleitung (2) und in der Wandlerbetriebsstellung des Wandlereinlassventils (6) mit dem Steuerkanal (14) verbindbar ist. Automatgetriebe nach Anspruch 1 , dadurch gekennzeichnet, dass das Wandlerauslassventil (7) ein druckgeregeltes 2/2 Wegeventil mit Federrückstellung ist. Automatgetriebe nach Anspruch 6, dadurch gekennzeichnet, dass das Wandlerauslassventil (7) mittels einer zusammengesetzten Kraft aus Versorgungsdruck p1 oder Steuerdruck p2 und Federkraft der Federrückstellung in die Schließstellung und mittels dem Versorgungsdruck p1 in die Offenstellung schaltbar ist. Automatgetriebe nach Anspruch 1 , dadurch gekennzeichnet, dass parallel zum Wandlerauslassventil (7) ein Überbrückungskanal (12) mit einer Drossel (10) zur Durchflusssteuerung vorgesehen ist. Automatgetriebe nach Anspruch 1 , dadurch gekennzeichnet, dass der Wandler (4) über das Wandlereingangsventil (6) in der Grundstellung entleerbar ist oder drucklos geschaltet ist. Verfahren zur Regelung eines Automatgetriebes mit Wandler (4) nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass das Wandlereinlassventil (6) derart ausgelegt ist, dass die Schaltung in eine Wandlerbetriebsstellung erfolgt sobald ein vom Proportionalventil (5) bereitgestellter Steuerdruck p2 anliegt und dass das Wandlerauslassventil (7) derart ausgelegt ist, dass die Schaltung in die Offenstellung nur erfolgt, wenn der Versorgungsdruck p1 größer ist als die Summe der Kräfte aus Federkraft der Federrückstellung des Wandlerauslassventils (7) und Schaltkraft des Steuerdrucks p2. Claims Automatic transmission with converter (4), the converter (4) being integrated into the oil circuit (8) of the automatic transmission, comprising a pump (3) arranged in a pressure line (2) for providing an oil volume flow with a supply pressure p1, a converter inlet valve ( 6), a converter outlet valve (7) and a proportional valve (5) for providing a control pressure p2 via a control channel (14), characterized in that the converter inlet valve (6) and the converter outlet valve (7) by means of the control pressure provided by the proportional valve (5). p2 can be switched, with a control channel (13) being provided between the converter inlet valve (6) and the converter outlet valve (7), via which the control pressure p2 is only activated for switching the converter outlet valve (7) if the switching of the converter inlet valve is activated by means of the control pressure p2 ( 6) from a basic position to a converter operating position. Automatic transmission according to claim 1, characterized in that the converter inlet valve (6) is a pressure-controlled 7/2-way valve with spring return. Automatic transmission according to claim 2, characterized in that the converter inlet valve (6) can be switched into the converter operating position by means of the control pressure p2 against a spring force of the spring return. Automatic transmission according to one of claims 1 to 3, characterized in that the pressure line (2) can be connected to a bypass channel (11) in the basic position of the converter inlet valve (6) and to the converter (4) in the converter operating position of the converter inlet valve (6). Automatic transmission according to one of claims 1 to 3, characterized in that the control channel (13) can be connected to the pressure line (2) in the basic position of the converter inlet valve (6) and with the control channel (14) in the converter operating position of the converter inlet valve (6). Automatic transmission according to claim 1, characterized in that the converter outlet valve (7) is a pressure-controlled 2/2-way valve with spring return. Automatic transmission according to claim 6, characterized in that the converter outlet valve (7) can be switched into the closed position by means of a composite force of supply pressure p1 or control pressure p2 and spring force of the spring return and into the open position by means of the supply pressure p1. Automatic transmission according to claim 1, characterized in that a bridging channel (12) with a throttle (10) for flow control is provided parallel to the converter outlet valve (7). Automatic transmission according to claim 1, characterized in that the converter (4) can be emptied in the basic position via the converter input valve (6) or is switched to no pressure. Method for controlling an automatic transmission with a converter (4) according to one of claims 6 to 9, characterized in that the converter inlet valve (6) is designed such that the shift into a converter operating position takes place as soon as a signal provided by the proportional valve (5). Control pressure p2 is present and that the converter outlet valve (7) is designed in such a way that switching to the open position only occurs when the supply pressure p1 is greater than the sum of the forces from the spring force of the spring return of the converter outlet valve (7) and the switching force of the control pressure p2.
PCT/EP2023/059117 2022-04-20 2023-04-06 Automatic transmission with converter and the control of the converter WO2023202892A1 (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
DE10110374A1 (en) 2001-03-03 2002-09-12 Zahnradfabrik Friedrichshafen Hydraulic system for control of automatic transmission with converter through-flow and converter bridging coupling regulating pressure control and regulated with the same priority
DE102009035082A1 (en) 2009-07-28 2011-02-10 Voith Patent Gmbh Transmission oil circuit
WO2017050674A1 (en) 2015-09-24 2017-03-30 Voith Patent Gmbh Oil supply system of an automatic transmission or automated manual transmission in a powertrain
DE102018122333A1 (en) * 2018-09-13 2020-03-19 Voith Patent Gmbh Oil cooling circuit of an automatic transmission

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9951861B2 (en) 2015-03-24 2018-04-24 Ford Global Technologies, Llc Transmission hydraulic control system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10110374A1 (en) 2001-03-03 2002-09-12 Zahnradfabrik Friedrichshafen Hydraulic system for control of automatic transmission with converter through-flow and converter bridging coupling regulating pressure control and regulated with the same priority
DE102009035082A1 (en) 2009-07-28 2011-02-10 Voith Patent Gmbh Transmission oil circuit
WO2017050674A1 (en) 2015-09-24 2017-03-30 Voith Patent Gmbh Oil supply system of an automatic transmission or automated manual transmission in a powertrain
EP3353452A1 (en) 2015-09-24 2018-08-01 Voith Patent GmbH Oil supply system of an automatic transmission or automated manual transmission in a powertrain
DE102018122333A1 (en) * 2018-09-13 2020-03-19 Voith Patent Gmbh Oil cooling circuit of an automatic transmission

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