WO2021058060A1 - Method for the verification of a valve position of a hybrid drive train with a parking lock and at least one electric motor - Google Patents

Method for the verification of a valve position of a hybrid drive train with a parking lock and at least one electric motor Download PDF

Info

Publication number
WO2021058060A1
WO2021058060A1 PCT/DE2020/100817 DE2020100817W WO2021058060A1 WO 2021058060 A1 WO2021058060 A1 WO 2021058060A1 DE 2020100817 W DE2020100817 W DE 2020100817W WO 2021058060 A1 WO2021058060 A1 WO 2021058060A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic
parking lock
slave cylinder
switching valve
clutch slave
Prior art date
Application number
PCT/DE2020/100817
Other languages
German (de)
French (fr)
Inventor
Ralf Mannsperger
Timo ENDERS
Original Assignee
Schaeffler Technologies AG & Co. KG
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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Priority to CN202080059758.6A priority Critical patent/CN114303021B/en
Priority to KR1020227007977A priority patent/KR20220039811A/en
Publication of WO2021058060A1 publication Critical patent/WO2021058060A1/en

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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0476—Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof
    • 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
    • F16H61/0276—Elements specially adapted for hydraulic control units, e.g. 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
    • 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
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/2807—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted using electric control signals for shift actuators, e.g. electro-hydraulic control therefor
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/34—Locking or disabling mechanisms
    • F16H63/3416—Parking lock mechanisms or brakes in the transmission
    • F16H63/3425—Parking lock mechanisms or brakes in the transmission characterised by pawls or wheels
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/34—Locking or disabling mechanisms
    • F16H63/3416—Parking lock mechanisms or brakes in the transmission
    • F16H63/3483—Parking lock mechanisms or brakes in the transmission with hydraulic actuating means
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • F16H63/46—Signals to a clutch outside the gearbox
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/92—Hybrid vehicles
    • 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
    • F16H2061/1208—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures with diagnostic check cycles; Monitoring of 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
    • 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
    • F16H61/0202—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 electric
    • F16H61/0204—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 electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • F16H61/0206—Layout of electro-hydraulic control circuits, e.g. arrangement of valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Definitions

  • the invention relates to a method for verifying a valve position of a hybrid drive train with a parking lock and at least one electric motor, in which a hydraulic cylinder of the parking lock to unlock a parking lock is controlled via a hydraulic drive, the hydraulic drive also having a clutch slave cylinder for controlling a disconnect clutch Controls the hybrid drive train and a switching valve provides either the first hydraulic path containing the parking lock or a second hydraulic path comprising the clutch slave cylinder with hydraulic fluid.
  • a parking lock is provided in drive trains of vehicles in order to secure the parked vehicle against unintentional rolling, especially on a slope.
  • the parking lock usually has a parking lock pawl and a parking lock wheel.
  • a parking lock pawl By engaging the parking lock pawl in a tooth gap of the parking lock gear, a positive fit is established between the drive train and the transmission housing. The vehicle is thus secured. By disengaging the parking lock pawl from the tooth gap, the drive train and thus the vehicle are unlocked.
  • An example of a parking lock is disclosed in DE 102 59893 A1.
  • the parking lock is arranged in a hydraulic circuit and is controlled by a hydraulic drive.
  • a parking lock pawl is unlocked via a hydraulic cylinder of a parking lock actuator and kept open via a holding magnet.
  • a hydraulic fluid is pumped into the hydraulic cylinder of the parking lock actuator via the hydraulic drive, which is designed as a combined actuator pump, with the actuator also being used to control a separating clutch of a hybrid drive train comprising two electric motors and to cool and lubricate the hybrid transmission and the electric motors.
  • the hydraulic fluid is directed in different directions via a switching valve.
  • the invention is based on the object of providing a method for verifying a valve position of a hybrid drive train with a parking lock and at least one electric motor, in which the current position of the switching valve is reliably detected.
  • the object is achieved in that a position of the switching valve is monitored by evaluating a pressure behavior in the clutch slave cylinder and / or a change in position of a piston in the hydraulic cylinder of the parking lock actuator when the hydraulic drive is actuated.
  • This has the advantage that a reliable conclusion about the position of the switching valve can be drawn by comparing the pressure behavior of the clutch slave cylinder and the change in position of the piston of the parking lock actuator. This takes into account a safety aspect that the parking lock is unintentionally unlocked, so that the vehicle is reliably prevented from rolling away if the switching valve is in the wrong position.
  • the switching valve is switched in the direction of the second hydraulic path comprising the clutch slave cylinder and the hydraulic drive is driven to convey the hydraulic fluid into the clutch slave cylinder, the position of the switching valve being recognized as correct when a pressure increase in the clutch slave cylinder is detected.
  • the change in position of the piston in the hydraulic cylinder of the parking lock actuator is monitored when the hydraulic drive is switched on and the switching valve is in the direction of the second hydraulic path encompassing the clutch slave cylinder, the position of the switching valve being faulty for a predetermined change in the position of the piston is recognized.
  • the assessment of the position of the switching valve once made with the help of the pressure test is checked by evaluating the position change of the piston of the parking lock actuator. In the event of a positive change in the position of the piston, it is possible to reliably deduce an incorrect position of the switching valve, even if the pressure in the clutch slave cylinder changes slightly.
  • a speed of the hydraulic drive is set such that the parking pawl remains engaged when the piston is in a position below a predetermined change. This ensures that the parking lock cannot be disengaged despite the incorrect valve position.
  • the hydraulic drive is switched off after the pressure increase in the clutch slave cylinder has been determined or after the change in position of the piston of the hydraulic cylinder has been determined. This completes the procedure for verifying the position of the switching valve.
  • the position of the switching valve can be checked particularly precisely if the pressure is measured directly on the clutch slave cylinder and the position of the piston is measured directly on the hydraulic cylinder of the parking lock actuator.
  • a drain valve of the separating clutch is advantageously closed. This reliably prevents falsification of the assessment of the valve position.
  • the hybrid unit supplies a further consumer for cooling two electric motors of the hydraulic drive train with the hydraulic fluid.
  • a particularly complex hydraulic system can be operated with only one hydraulic drive, which reduces the costs for the hydraulic drive train.
  • 1 shows a schematic diagram of a hybrid drive train
  • FIG. 3 shows an exemplary embodiment of a hydraulic device for carrying out the method according to the invention
  • FIG. 4 shows an embodiment of the method according to the invention.
  • Fig. 1 an embodiment of a hybrid drive train of a vehicle is Darge provides.
  • a first electric motor 4 is arranged between an internal combustion engine 2 and an output 3, which is shown by vehicle wheels, which is arranged on the drive side and can provide a first drive torque.
  • the first electric motor 4 is coupled to a second electric motor 6 via a hybrid disconnect clutch 5, which in turn is rigidly connected to the internal combustion engine 2.
  • a crankshaft 7 of the internal combustion engine 2 is connected to a rotor 8 of the second electric motor 6 in a rotating test.
  • the second electric motor 6 and the internal combustion engine 2 can be connected together with the output 3.
  • the second electric motor 6 and the internal combustion engine 2 are connected to a clutch input 9 of the hybrid disconnect clutch 5.
  • the second electric motor 6 can transmit the second drive torque and the internal combustion engine 2 the third drive torque to the output 3 together.
  • Both electric motors 4, 6 are designed as permanent-magnet synchronous motors.
  • the first electric motor 4 which provides the first drive torque, is connected to a clutch output 10 of the hybrid disconnect clutch 5.
  • the first electric motor 4 has a rotor 11 which is non-rotatably connected to the clutch output 10 and also connected to the output 3.
  • the first electric motor 4, the second electric motor 6 and the internal combustion engine 2 are connected in series and the hybrid disconnect clutch 5 is effectively arranged between the first electric motor 4 and the internal combustion engine 2 and between the first electric motor 4 and the second electric motor 6. If the hybrid disconnect clutch 5 is closed, the first electric motor 4 can deliver the first drive torque and the second electric motor 6 can deliver the second drive torque to the output 3. Whether the internal combustion engine 2 provides the third drive torque and also outputs it to the output 3 when the hybrid disconnect clutch 5 is closed, depends on the rotational speed of the internal combustion engine 2.
  • the internal combustion engine 2 rotates at a first speed. If the first speed is below an idling speed of the internal combustion engine 2, the internal combustion engine 2 runs free-standing and is dragged along. There is a drag torque of the internal combustion engine 2, wel Ches counteracts the second drive torque.
  • the internal combustion engine 2 is actively operated and provides the third drive torque ready.
  • the third drive torque adds up together with the first drive torque and, if the second electric motor 6 is also operated, with the second drive torque to a total drive torque, which is applied to the output 3 for driving the hybrid vehicle when the hybrid disconnect clutch 5 is closed.
  • the parking lock 12 is formed by a parking lock pawl 13 and a parking lock wheel 14, the parking lock pawl 13 being attached to a housing 15.
  • the parking lock pawl 13 is actuated by a parking lock actuator 16.
  • the parking lock gear 14 is arranged on an intermediate shaft 17 which is directly connected to the drive wheels, not shown.
  • FIG. 3 an embodiment of a hydraulic device 18 for performing the inventive method is shown.
  • the hydraulic device 18 comprises a pump 19 which is connected on one side of a coolant line 20.
  • the coolant line 20 ver brings a hydraulic fluid 21, for example oil, to a first consumer 22 in the form of a heat exchanger.
  • the hydraulic fluid 21 is brought to this first consumer 22 for the purpose of cooling or lubrication.
  • the pump 19 is connected to an actuation line 23.
  • the actuation line 23 is prepared to bring the hydraulic fluid 21 to a second consumer, for example a clutch slave cylinder 24, which is connected to the hybrid disconnect clutch 5 of the hybrid drive train 1.
  • the same hydraulic fluid 21 is contained in both lines, such as the coolant line 20 and the actuation line 23.
  • the parking lock actuator 16, which acts on the parking lock 12, is connected to the actuation line 23 as a further consumer.
  • a switching valve 25 is integrated into the coolant line 20 and / or the actuation line 23 in such a way that the hydraulic fluid 21 can be fed to the parking lock actuator 16 in a targeted manner.
  • the pump 19 is designed as an electrically driven reversing pump, which enables a first conveying direction in order to supply the hydraulic fluid 21 to the cooling / lubricating task as required, the pump 19 in a second conveying direction the hydraulic fluid 21 of one or more actuation functions, such as in present case of the clutch and / or parking lock function, supplies.
  • the pump 19 is driven by an electric motor 26 which is controlled by an actuator control unit 27.
  • the pump 19, the electric motor 26 and the actuator control unit 27 form an electric pump actuator.
  • a type of hydraulic fluid source 28 is used for all consumers 22, 24, 16 Gear sump used.
  • a pressure sensor 29 is arranged, which is connected to the actuator control unit 27 of the pump 19 and via this to power electronics 30 that control the entire drive unit.
  • a holding magnet 31 which is connected to a piston 32 of a hydraulic cylinder 33 of the parking lock actuator 16, releases the piston 32 contained in the parking lock actuator 16. Since the piston 32 is biased by a return spring 34 against a housing 35 of the parking lock actuator 16, after release by the holding magnet 31, the piston 32 is actuated by the return spring 34, which is why the hydraulic fluid 21 from the parking lock actuator 16 back into the actuation line
  • a position of the piston 32 in the hydraulic cylinder 33 is detected by a displacement sensor 36 arranged therein and output to the actuator control unit 27.
  • Fig. 4 an embodiment of the method according to the invention is shown.
  • the process is initialized in block 100.
  • block 110 it is queried whether the parking lock 12 has been inserted. If this is not the case, a return is made to the input of block 110. If the parking lock 12 has been engaged, the process continues to block 120, where the switching valve 25 is set in the direction of the clutch slave cylinder 24.
  • block 130 a discharge valve 38 of the hybrid disconnect clutch 5 is closed to increase pressure in the clutch slave cylinder
  • the pump 19 is then activated in block 140 in order to carry out the delivery of the hydraulic fluid 21 into the clutch slave cylinder 24, the speed of the pump 19 being initially regulated.
  • block 150 it is queried whether the pressure in the clutch slave cylinder 24 has changed positively. If this is the case, the pump 19 is switched off (block 160) and, in block 170, the switching valve 25 in its assumed position is classified as ready for operation. If, however, it is determined in block 150 that the pressure in the clutch slave cylinder 24 has not changed positively, the process continues to block 180, where it is checked whether the position of the piston 32 of the hydraulic cylinder 33 of the parking lock actuator 16 has changed positively. If this is not the case, a return is made to block 150. If the position of the piston 32 has changed positively in block 180, the pump 19 is switched off in block 190 and the position of Heidelbergven valve 25 is classified as faulty in block 200 and an error memory entry is set in block 210.

Abstract

The invention relates to a method for the verification of a valve position of a hybrid drive train with a parking lock and at least one electric motor, in which method a hydraulic cylinder (33) of the parking lock (12) is actuated via a hydraulic drive (19) in order to unlock a parking lock pawl (13), wherein the hydraulic drive (19) likewise actuates a clutch slave cylinder (24) for controlling a separating clutch (5) of the hybrid drive train (1), and a switching valve (25) supplies hydraulic fluid (21) either to the first hydraulic path which comprises the parking lock (12), or to a second hydraulic path which comprises the clutch slave cylinder (24). In a method in which the current position of the switching valve is detected reliably, a position of the switching valve (25) is monitored by, in the case of an actuated hydraulic drive (19), a pressure behaviour in the clutch slave cylinder (24) and/or a positional change of a piston (32) in the hydraulic cylinder (33) of the parking lock (12) being evaluated.

Description

Verfahren zur Verifizierung einer Ventilstellunq eines Hvbridantriebsstranqes mit einer Method for verifying a valve position of a hybrid drive train with a
Parksperre und mindestens einem Elektromotor Parking lock and at least one electric motor
Die Erfindung betrifft ein Verfahren zur Verifizierung einer Ventilstellung eines Hybridantriebs stranges mit einer Parksperre und mindestens einem Elektromotor, bei welchem ein Hydrau likzylinder der Parksperre zur Entriegelung einer Parks perrenklinke über einen Hydraulikan trieb angesteuert wird, wobei der Hydraulikantrieb ebenfalls einen Kupplungsnehmerzylinder zur Steuerung einer Trennkupplung des Hybridantriebsstranges ansteuert und ein Schaltventil entweder den ersten, die Parksperre enthaltenden hydraulischen Pfad oder einen zweiten, den Kupplungsnehmerzylinder umfassenden hydraulischen Pfad mit Hydraulikflüssigkeit ver sorgt. The invention relates to a method for verifying a valve position of a hybrid drive train with a parking lock and at least one electric motor, in which a hydraulic cylinder of the parking lock to unlock a parking lock is controlled via a hydraulic drive, the hydraulic drive also having a clutch slave cylinder for controlling a disconnect clutch Controls the hybrid drive train and a switching valve provides either the first hydraulic path containing the parking lock or a second hydraulic path comprising the clutch slave cylinder with hydraulic fluid.
In Antriebssträngen von Fahrzeugen wird in den meisten Fällen eine Parksperre vorgesehen, um das parkende Fahrzeug, insbesondere am Hang, gegen unabsichtliches Wegrollen abzu sichern. In most cases, a parking lock is provided in drive trains of vehicles in order to secure the parked vehicle against unintentional rolling, especially on a slope.
Die Parksperre verfügt normalerweise über eine Parksperrenklinke und ein Parksperrenrad. Durch Einrasten der Parks perrenklinke in eine Zahnlücke des Parksperrenrades wird ein Formschluss zwischen dem Antriebsstrang und dem Getriebegehäuse hergestellt. Somit ist das Fahrzeug abgesichert. Durch Auslegen der Parksperrenklinke aus der Zahnlücke ist der Antriebsstrang und somit das Fahrzeug entsperrt. Ein Beispiel einer Parksperre ist in der DE 102 59893 A1 offenbart. The parking lock usually has a parking lock pawl and a parking lock wheel. By engaging the parking lock pawl in a tooth gap of the parking lock gear, a positive fit is established between the drive train and the transmission housing. The vehicle is thus secured. By disengaging the parking lock pawl from the tooth gap, the drive train and thus the vehicle are unlocked. An example of a parking lock is disclosed in DE 102 59893 A1.
Aus der noch unveröffentlichten deutschen Patentanmeldung der Anmelderin mit dem Akten zeichen DE 102019102779.9 ist die Parksperre in einem Hydraulikkreis angeordnet und wird von einem Hydraulikantrieb angesteuert. Eine Parksperrenklinke wird dabei über einen Hyd raulikzylinder eines Parksperrenbetätigers entriegelt und über einen Haltemagneten offenge halten. Eine Hydraulikflüssigkeit wird über den als kombinierte Aktorpumpe ausgebildeten Hydraulikantrieb in den Hydraulikzylinder des Parksperrenbetätigers gepumpt, wobei die Ak torpumpe auch zum Steuern einer Trennkupplung eines zwei Elektromotoren umfassenden Hybridantriebsstranges und zur Kühlung und Schmierung des Hybridgetriebes und der Elekt romotoren eingesetzt wird. Damit die einzelnen Funktionen des Hybridkreises getrennt vonei nander angesteuert werden können, wird die Hydraulikflüssigkeit über ein Schaltventil in ver schiedene Richtungen gelenkt. Allerdings kann es bei einer versehentlichen falschen Stellung des Schaltventils zu einer unbeabsichtigten Entriegelung der Parksperre kommen, da es nach Schließen der Parksperre nicht gewährleistet ist, dass das Schaltventil in seine Ruheposition zurückgedrückt wird. From the as yet unpublished German patent application by the applicant with the filing sign DE 102019102779.9, the parking lock is arranged in a hydraulic circuit and is controlled by a hydraulic drive. A parking lock pawl is unlocked via a hydraulic cylinder of a parking lock actuator and kept open via a holding magnet. A hydraulic fluid is pumped into the hydraulic cylinder of the parking lock actuator via the hydraulic drive, which is designed as a combined actuator pump, with the actuator also being used to control a separating clutch of a hybrid drive train comprising two electric motors and to cool and lubricate the hybrid transmission and the electric motors. So that the individual functions of the hybrid circuit can be controlled separately from one another, the hydraulic fluid is directed in different directions via a switching valve. However, it can happen in the case of an accidental wrong position of the switching valve lead to an unintentional unlocking of the parking lock, since after closing the parking lock it is not guaranteed that the switching valve will be pushed back into its rest position.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Verifizierung einer Ventilstellung eines Hybridantriebsstranges mit einer Parksperre und mindestens einem Elektromotor anzu geben, bei welchen die aktuelle Stellung des Schaltventils zuverlässig erkannt wird. The invention is based on the object of providing a method for verifying a valve position of a hybrid drive train with a parking lock and at least one electric motor, in which the current position of the switching valve is reliably detected.
Erfindungsgemäß ist die Aufgabe dadurch gelöst, dass eine Stellung des Schaltventils über wacht wird, indem bei betätigtem Hydraulikantrieb ein Druckverhalten in dem Kupplungsneh merzylinder und/oder eine Positionsänderung eines Kolbens in dem Hydraulikzylinder des Parksperrenbetätigers ausgewertet wird. Dies hat den Vorteil, dass durch einen Vergleich des Druckverhaltens des Kupplungsnehmerzylinders und der Positionsveränderung des Kolbens des Parksperrenbetätigers ein zuverlässiger Rückschluss auf die Stellung des Schaltventils gezogen werden kann. Damit wird ein Sicherheitsaspekt, dass die Parksperre ungewollt ent riegelt ist, berücksichtigt, so dass ein Wegrollen des Fahrzeuges bei einer Fahlstellung des Schaltventils zuverlässig unterbunden wird. According to the invention, the object is achieved in that a position of the switching valve is monitored by evaluating a pressure behavior in the clutch slave cylinder and / or a change in position of a piston in the hydraulic cylinder of the parking lock actuator when the hydraulic drive is actuated. This has the advantage that a reliable conclusion about the position of the switching valve can be drawn by comparing the pressure behavior of the clutch slave cylinder and the change in position of the piston of the parking lock actuator. This takes into account a safety aspect that the parking lock is unintentionally unlocked, so that the vehicle is reliably prevented from rolling away if the switching valve is in the wrong position.
Vorteilhafterweise wird nach Einlegen der Parksperre das Schaltventil in Richtung des zwei ten, den Kupplungsnehmerzylinder umfassenden hydraulischen Pfades geschaltet und der Hydraulikantrieb zur Förderung der Hydraulikflüssigkeit in den Kupplungsnehmerzylinder an getrieben, wobei bei einem detektierten Druckanstieg im Kupplungsnehmerzylinder die Stel lung des Schaltventils als korrekt erkannt wird. Durch Detektion eines positiven Druckanstie ges in dem Kupplungsnehmerzylinder kann einfach festgestellt werden, dass das Schaltventil die richtige Stellung eingenommen hat, da die Hydraulikflüssigkeit in den Kupplungsneh merzylinder einströmt. Advantageously, after engaging the parking lock, the switching valve is switched in the direction of the second hydraulic path comprising the clutch slave cylinder and the hydraulic drive is driven to convey the hydraulic fluid into the clutch slave cylinder, the position of the switching valve being recognized as correct when a pressure increase in the clutch slave cylinder is detected. By detecting a positive increase in pressure in the clutch slave cylinder, it can easily be established that the switching valve has assumed the correct position, since the hydraulic fluid flows into the clutch slave cylinder.
In einer Ausgestaltung wird bei eingeschaltetem Hydraulikantrieb und einer Stellung des Schaltventils in Richtung des zweiten, den Kupplungsnehmerzylinder umfassenden hydrauli schen Pfades die Positionsänderung des Kolbens in dem Hydraulikzylinder des Parksperren betätigers überwacht, wobei bei einer vorgegebenen Änderung der Position des Kolbens die Stellung des Schaltventils als fehlerhaft erkannt wird. Die einmal mit Hilfe der Druckprüfung getroffene Einschätzung der Stellung des Schaltventils wird durch die Auswertung der Positi onsänderung des Kolbens des Parksperrenbetätigers überprüft. Bei einer positiven Positions änderung des Kolbens kann zuverlässig auf eine Fehlstellung des Schaltventils geschlossen werden, auch wenn sich der Druck im Kupplungsnehmerzylinder geringfügig ändert. In einer Variante wird eine Geschwindigkeit des Hydraulikantriebs so eingestellt, dass bei ei ner Position des Kolbens unterhalb einer vorgegebenen Änderung die Parksperrenklinke ein gelegt bleibt. Somit wird sichergestellt, dass die Parksperre trotz falscher Ventilstellung nicht ausgelegt werde kann. In one embodiment, the change in position of the piston in the hydraulic cylinder of the parking lock actuator is monitored when the hydraulic drive is switched on and the switching valve is in the direction of the second hydraulic path encompassing the clutch slave cylinder, the position of the switching valve being faulty for a predetermined change in the position of the piston is recognized. The assessment of the position of the switching valve once made with the help of the pressure test is checked by evaluating the position change of the piston of the parking lock actuator. In the event of a positive change in the position of the piston, it is possible to reliably deduce an incorrect position of the switching valve, even if the pressure in the clutch slave cylinder changes slightly. In one variant, a speed of the hydraulic drive is set such that the parking pawl remains engaged when the piston is in a position below a predetermined change. This ensures that the parking lock cannot be disengaged despite the incorrect valve position.
In einer Ausführungsform wird nach der Bestimmung des Druckanstieges im Kupplungsneh merzylinder bzw. nach Ermittlung der Positionsänderung des Kolbens des Hydraulikzylinders der Hydraulikantrieb abgeschaltet. Damit wird das Verfahren zur Verifizierung der Stellung des Schaltventils abgeschlossen. In one embodiment, the hydraulic drive is switched off after the pressure increase in the clutch slave cylinder has been determined or after the change in position of the piston of the hydraulic cylinder has been determined. This completes the procedure for verifying the position of the switching valve.
Eine besonders genaue Prüfung der Stellung des Schaltventils kann erfolgen, wenn der Druck direkt an dem Kupplungsnehmerzylinder und die Position des Kolbens direkt an dem Hydrau likzylinder des Parksperrenbetätigers gemessen werden. The position of the switching valve can be checked particularly precisely if the pressure is measured directly on the clutch slave cylinder and the position of the piston is measured directly on the hydraulic cylinder of the parking lock actuator.
Vorteilhafterweise wird ein Ablassventil der Trennkupplung geschlossen. Dadurch wird eine Verfälschung der Einschätzung der Ventilstellung zuverlässig unterbunden. A drain valve of the separating clutch is advantageously closed. This reliably prevents falsification of the assessment of the valve position.
In einer Ausgestaltung versorgt die Hybrideinheit einen weiteren Verbraucher zur Kühlung von zwei Elektromotoren des Hydraulikantriebsstranges mit der Hydraulikflüssigkeit. Dadurch kann ein besonders komplexes Hydrauliksystem mit nur einem Hydraulikantrieb betrieben werden, was die Kosten für den Hydraulikantriebsstrang reduziert. In one embodiment, the hybrid unit supplies a further consumer for cooling two electric motors of the hydraulic drive train with the hydraulic fluid. As a result, a particularly complex hydraulic system can be operated with only one hydraulic drive, which reduces the costs for the hydraulic drive train.
Die Erfindung lässt zahlreiche Ausführungsformen zu eine davon soll anhand der in der Zeichnung dargestellten Figuren näher erläutert werden. The invention allows numerous embodiments, one of which will be explained in more detail with reference to the figures shown in the drawing.
Es zeigen: Show it:
Fig. 1 eine Prinzipdarstellung eines Hybridantriebsstranges, 1 shows a schematic diagram of a hybrid drive train,
Fig. 2 eine Prinzipdarstellung einer Parksperre, 2 shows a basic illustration of a parking lock,
Fig. 3 ein Ausführungsbeispiel einer Hydraulikeinrichtung zur Durchführung des erfin dungsgemäßen Verfahrens, 3 shows an exemplary embodiment of a hydraulic device for carrying out the method according to the invention,
Fig. 4 ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens. In Fig. 1 ist ein Ausführungsbeispiel eines Hybridantriebsstranges eines Fahrzeuges darge stellt. Bei diesem Hybridantriebsstrang 1 ist zwischen einem Verbrennungsmotor 2 und einem Abtrieb 3, der durch Fahrzeugräder gezeigt ist, ein erster Elektromotor 4 angeordnet, der ab triebsseitig angeordnet ist und ein erstes Antriebsdrehmoment bereitstellen kann. Über eine Hybridtrennkupplung 5 ist der erste Elektromotor 4 mit einem zweiten Elektromotor 6 gekop pelt, der wiederum starr mit dem Verbrennungsmotor 2 verbunden ist. Dabei ist eine Kurbel welle 7 des Verbrennungsmotors 2 mit einem Rotor 8 des zweiten Elektromotors 6 drehtest verbunden. Der zweite Elektromotor 6 und der Verbrennungsmotor 2 sind gemeinsam mit dem Abtrieb 3 verbindbar. Der zweite Elektromotor 6 und der Verbrennungsmotor 2 sind mit einem Kupplungseingang 9 der Hybridtrennkupplung 5 verbunden. Bei geschlossener Hybrid trennkupplung 5 können der zweite Elektromotor 6 das zweite Antriebsdrehmoment und der Verbrennungsmotor 2 das dritte Antriebsdrehmoment an den Abtrieb 3 gemeinsam übertra gen. Beide Elektromotoren 4, 6 sind als permanenterregte Synchronmotoren ausgebildet. 4 shows an embodiment of the method according to the invention. In Fig. 1 an embodiment of a hybrid drive train of a vehicle is Darge provides. In this hybrid drive train 1, a first electric motor 4 is arranged between an internal combustion engine 2 and an output 3, which is shown by vehicle wheels, which is arranged on the drive side and can provide a first drive torque. The first electric motor 4 is coupled to a second electric motor 6 via a hybrid disconnect clutch 5, which in turn is rigidly connected to the internal combustion engine 2. A crankshaft 7 of the internal combustion engine 2 is connected to a rotor 8 of the second electric motor 6 in a rotating test. The second electric motor 6 and the internal combustion engine 2 can be connected together with the output 3. The second electric motor 6 and the internal combustion engine 2 are connected to a clutch input 9 of the hybrid disconnect clutch 5. When the hybrid disconnect clutch 5 is closed, the second electric motor 6 can transmit the second drive torque and the internal combustion engine 2 the third drive torque to the output 3 together. Both electric motors 4, 6 are designed as permanent-magnet synchronous motors.
Mit einem Kupplungsausgang 10 der Hybridtrennkupplung 5 ist der erste Elektromotor 4 ver bunden, der das erste Antriebsmoment bereitstellt. Der erste Elektromotor 4 weist einen Rotor 11 auf, der mit dem Kupplungsausgang 10 drehfest und auch mit dem Abtrieb 3 verbunden ist. The first electric motor 4, which provides the first drive torque, is connected to a clutch output 10 of the hybrid disconnect clutch 5. The first electric motor 4 has a rotor 11 which is non-rotatably connected to the clutch output 10 and also connected to the output 3.
Der erste Elektromotor 4, der zweite Elektromotor 6 und der Verbrennungsmotor 2 sind in Reihe geschaltet und die Hybridtrennkupplung 5 ist zwischen dem ersten Elektromotor 4 und dem Verbrennungsmotor 2 sowie zwischen dem ersten Elektromotor 4 und dem zweiten Elektromotor 6 wirksam angeordnet. Ist die Hybridtrennkupplung 5 geschlossen, kann der ers te Elektromotor 4 das erste Antriebsdrehmoment und der zweite Elektromotor 6 das zweite Antriebsdrehmoment an den Abtrieb 3 abgeben. Ob der Verbrennungsmotor 2 das dritte An triebsdrehmoment bereitstellt und bei geschlossener Hybridtrennkupplung 5 ebenfalls an den Abtrieb 3 abgibt, hängt davon ab, welche Drehzahl an dem Verbrennungsmotor 2 anliegt. The first electric motor 4, the second electric motor 6 and the internal combustion engine 2 are connected in series and the hybrid disconnect clutch 5 is effectively arranged between the first electric motor 4 and the internal combustion engine 2 and between the first electric motor 4 and the second electric motor 6. If the hybrid disconnect clutch 5 is closed, the first electric motor 4 can deliver the first drive torque and the second electric motor 6 can deliver the second drive torque to the output 3. Whether the internal combustion engine 2 provides the third drive torque and also outputs it to the output 3 when the hybrid disconnect clutch 5 is closed, depends on the rotational speed of the internal combustion engine 2.
Wenn zumindest der zweite Elektromotor 6 das zweite Antriebsdrehmoment bereitstellt, dreht der Verbrennungsmotor 2 mit einer ersten Drehzahl. Wenn die erste Drehzahl unterhalb einer Leerlaufdrehzahl des Verbrennungsmotor 2 liegt, läuft der Verbrennungsmotor 2 freistehend und wird mitgeschleppt. Dabei liegt ein Schleppmoment des Verbrennungsmotors 2 vor, wel ches dem zweiten Antriebsdrehmoment entgegenwirkt. When at least the second electric motor 6 provides the second drive torque, the internal combustion engine 2 rotates at a first speed. If the first speed is below an idling speed of the internal combustion engine 2, the internal combustion engine 2 runs free-standing and is dragged along. There is a drag torque of the internal combustion engine 2, wel Ches counteracts the second drive torque.
Wenn die erste Drehzahl einer Leerlaufdrehzahl des Verbrennungsmotors 2 entspricht oder darüber liegt, wird der Verbrennungsmotor 2 aktiv betrieben und stellt das dritte Antriebs- drehmoment bereit. Dabei summiert sich das dritte Antriebsdrehmoment zusammen mit dem ersten Antriebsdrehmoment und wenn auch der zweite Elektromotor 6 betrieben wird, mit dem zweiten Antriebsdrehmoment zu einem Gesamtantriebsdrehmoment auf, welches bei ge schlossener Hybridtrennkupplung 5 an dem Abtrieb 3 zum Antreiben des Hybridfahrzeuges anliegt. If the first speed corresponds to an idling speed of the internal combustion engine 2 or above, the internal combustion engine 2 is actively operated and provides the third drive torque ready. The third drive torque adds up together with the first drive torque and, if the second electric motor 6 is also operated, with the second drive torque to a total drive torque, which is applied to the output 3 for driving the hybrid vehicle when the hybrid disconnect clutch 5 is closed.
Fig. 2 zeigt eine Prinzipdarstellung einer Parksperre 12. Die Parksperre 12 ist durch eine Parksperrenklinke 13 und ein Parksperrenrad 14 gebildet, wobei die Parks perrenklinke 13 an einem Gehäuse 15 befestigt ist. Die Parksperrenklinke 13 wird von einem Parksperrenbetäti- ger 16 betätigt. Das Parksperrenrad 14 ist auf einer Zwischenwelle 17 angeordnet, welche di rekt mit den nicht weiter dargestellten Antriebsrädern verbunden ist. 2 shows a basic illustration of a parking lock 12. The parking lock 12 is formed by a parking lock pawl 13 and a parking lock wheel 14, the parking lock pawl 13 being attached to a housing 15. The parking lock pawl 13 is actuated by a parking lock actuator 16. The parking lock gear 14 is arranged on an intermediate shaft 17 which is directly connected to the drive wheels, not shown.
In Fig. 3 ist ein Ausführungsbeispiel einer Hydraulikeinrichtung 18 zur Durchführung des erfin dungsgemäßen Verfahrens dargestellt. Die Hydraulikeinrichtung 18 umfasst eine Pumpe 19, die auf einer Seite einer Kühlmittelleitung 20 angebunden ist. Die Kühlmittelleitung 20 ver bringt eine Hydraulikflüssigkeit 21 , beispielsweise Öl, zu einem ersten Verbraucher 22 in Form eines Wärmetauschers. Zu diesem ersten Verbraucher 22 wird die Hydraulikflüssigkeit 21 zum Zwecke einer Kühlung oder einer Schmierung verbracht. In Fig. 3, an embodiment of a hydraulic device 18 for performing the inventive method is shown. The hydraulic device 18 comprises a pump 19 which is connected on one side of a coolant line 20. The coolant line 20 ver brings a hydraulic fluid 21, for example oil, to a first consumer 22 in the form of a heat exchanger. The hydraulic fluid 21 is brought to this first consumer 22 for the purpose of cooling or lubrication.
Auf der anderen Seite ist die Pumpe 19 mit einer Aktuierungsleitung 23 verbunden. Die Aktu- ierungsleitung 23 ist vorbereitet, um die Hydraulikflüssigkeit 21 zu einem zweiten Verbraucher zu bringen, beispielsweise einem Kupplungsnehmerzylinder 24, der in Verbindung mit der Hybridtrennkupplung 5 des Hybridantriebstranges 1 steht. Grundsätzlich ist in beiden Leitun gen, wie der Kühlmittelleitung 20 und der Aktuierungsleitung 23, dieselbe Hydraulikflüssigkeit 21 enthalten. An die Aktuierungsleitung 23 ist als weiterer Verbraucher der Parksperrenbetäti- ger 16 angeschlossen, der auf die Parksperre 12 wirkt. Ein Schaltventil 25 ist so in die Kühl mittelleitung 20 und/oder die Aktuierungsleitung 23 eingebunden, dass die Hydraulikflüssigkeit 21 gezielt dem Parksperrenbetätiger 16 zuführbar ist. On the other hand, the pump 19 is connected to an actuation line 23. The actuation line 23 is prepared to bring the hydraulic fluid 21 to a second consumer, for example a clutch slave cylinder 24, which is connected to the hybrid disconnect clutch 5 of the hybrid drive train 1. Basically, the same hydraulic fluid 21 is contained in both lines, such as the coolant line 20 and the actuation line 23. The parking lock actuator 16, which acts on the parking lock 12, is connected to the actuation line 23 as a further consumer. A switching valve 25 is integrated into the coolant line 20 and / or the actuation line 23 in such a way that the hydraulic fluid 21 can be fed to the parking lock actuator 16 in a targeted manner.
Die Pumpe 19 ist dabei als elektrisch angetriebene Reversierpumpe ausgebildet, die eine ers te Förderrichtung ermöglicht, um die Hydraulikflüssigkeit 21 bedarfsgerecht der Kühl- /Schmieraufgabe zuzuführen, wobei die Pumpe 19 in einer zweiten Förderrichtung die Hyd raulikflüssigkeit 21 einer oder mehrerer Aktuierungsfunktionen, wie beispielsweise im vorlie genden Fall der Kupplungs- und/oder Parksperrenfunktion, zuführt. Die Pumpe 19 wird von einem Elektromotor 26 angetrieben, der von einer Aktorsteuereinheit 27 angesteuert wird. Die Pumpe 19, der Elektromotor 26 und die Aktorsteuereinheit 27 bilden dabei einen elektrischen Pumpenaktor. Als Hydraulikflüssigkeitsquelle 28 wird für alle Verbraucher 22, 24, 16 eine Art Getriebesumpf verwendet. In der Aktuierungsleitung 23 ist ein Drucksensor 29 angeordnet, welcher mit der Aktorsteuereinheit 27 der Pumpe 19 und über diese mit einer die gesamte An triebseinheit steuernde Leistungselektronik 30 verbunden ist. The pump 19 is designed as an electrically driven reversing pump, which enables a first conveying direction in order to supply the hydraulic fluid 21 to the cooling / lubricating task as required, the pump 19 in a second conveying direction the hydraulic fluid 21 of one or more actuation functions, such as in present case of the clutch and / or parking lock function, supplies. The pump 19 is driven by an electric motor 26 which is controlled by an actuator control unit 27. The pump 19, the electric motor 26 and the actuator control unit 27 form an electric pump actuator. A type of hydraulic fluid source 28 is used for all consumers 22, 24, 16 Gear sump used. In the actuation line 23, a pressure sensor 29 is arranged, which is connected to the actuator control unit 27 of the pump 19 and via this to power electronics 30 that control the entire drive unit.
Um die Parksperre 12 zu schließen, gibt ein Haltemagnet 31, welcher an einem Kolben 32 ei nes Hydraulikzylinders 33 des Parksperrenbetätigers 16 angebunden ist, den in dem Park- sperrenbetätiger 16 enthaltenen Kolben 32 frei. Da der Kolben 32 über eine Rückstellfeder 34 gegenüber einem Gehäuse 35 des Parksperrenbetätigers 16 vorgespannt ist, wird nach Frei gabe durch den Haltemagnet 31 der Kolben 32 durch die Rückstellfeder 34 betätigt, weshalb die Hydraulikflüssigkeit 21 aus dem Parksperrenbetätiger 16 zurück in die AktuierungsleitungIn order to close the parking lock 12, a holding magnet 31, which is connected to a piston 32 of a hydraulic cylinder 33 of the parking lock actuator 16, releases the piston 32 contained in the parking lock actuator 16. Since the piston 32 is biased by a return spring 34 against a housing 35 of the parking lock actuator 16, after release by the holding magnet 31, the piston 32 is actuated by the return spring 34, which is why the hydraulic fluid 21 from the parking lock actuator 16 back into the actuation line
23 gedrückt wird. Eine Position des Kolbens 32 in dem Hydraulikzylinder 33 wird durch einen in diesem angeordneten Wegsensor 36 erfasst und an die Aktorsteuereinheit 27 ausgegeben. In dem Kupplungsnehmerzylinder 24 ist ein weiterer Drucksensor 37 zur Erfassung des Dru ckes der Hydraulikflüssigkeit 21 angeordnet, der mit der Aktorsteuereinheit 17 verbunden ist. 23 is pressed. A position of the piston 32 in the hydraulic cylinder 33 is detected by a displacement sensor 36 arranged therein and output to the actuator control unit 27. A further pressure sensor 37 for detecting the pressure of the hydraulic fluid 21, which is connected to the actuator control unit 17, is arranged in the clutch slave cylinder 24.
In Fig. 4 ist ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens dargestellt. Das Ver fahren wird im Block 100 initialisiert. Im Block 110 wird abgefragt, ob die Parksperre 12 einge legt worden ist. Ist dies nicht der Fall wird zum Eingang des Blocks 110 zurückgegangen. Wurde die Parksperre 12 eingelegt, wird zum Block 120 weitergegangen, wo das Schaltventil 25 in Richtung des Kupplungsnehmerzylinders 24 eingestellt wird. Im Block 130 wird ein Ab lassventil 38 der Hybridtrennkupplung 5 geschlossen, um Druck im KupplungsnehmerzylinderIn Fig. 4 an embodiment of the method according to the invention is shown. The process is initialized in block 100. In block 110 it is queried whether the parking lock 12 has been inserted. If this is not the case, a return is made to the input of block 110. If the parking lock 12 has been engaged, the process continues to block 120, where the switching valve 25 is set in the direction of the clutch slave cylinder 24. In block 130, a discharge valve 38 of the hybrid disconnect clutch 5 is closed to increase pressure in the clutch slave cylinder
24 aufzubauen. Anschließend wird im Block 140 die Pumpe 19 aktiviert, um die Förderung der Hydraulikflüssigkeit 21 in den Kupplungsnehmerzylinder 24 vorzunehmen, wobei die Drehzahl der Pumpe 19 zunächst eingeregelt wird. Im Block 150 wird abgefragt, ob sich der Druck in dem Kupplungsnehmerzylinder 24 positiv geändert hat. Ist dies der Fall, wird die Pumpe 19 abgeschaltet (Block 160) und im Block 170 das Schaltventil 25 in seiner einge nommenen Stellung als funktionsbereit klassifiziert. Wird im Block 150 aber festgestellt, dass sich der Druck im Kupplungsnehmerzylinder 24 nicht positiv verändert hat, wird zum Block 180 weitergegangen, wo geprüft wird, ob sich die Position des Kolbens 32 des Hydraulikzylin ders 33 des Parksperrenbetätigers 16 positiv verändert hat. Ist dies nicht der Fall, wird zum Block 150 zurückgegangen. Wenn sich im Block 180 die Position des Kolbens 32 aber positiv verändert hat, wird im Block 190 die Pumpe 19 abgeschaltet und die Stellung des Schaltven tils 25 als fehlerhaft im Block 200 klassifiziert und im Block 210 ein Fehlerspeichereintrag ge setzt. Bezuqszeichenliste 24 to build. The pump 19 is then activated in block 140 in order to carry out the delivery of the hydraulic fluid 21 into the clutch slave cylinder 24, the speed of the pump 19 being initially regulated. In block 150 it is queried whether the pressure in the clutch slave cylinder 24 has changed positively. If this is the case, the pump 19 is switched off (block 160) and, in block 170, the switching valve 25 in its assumed position is classified as ready for operation. If, however, it is determined in block 150 that the pressure in the clutch slave cylinder 24 has not changed positively, the process continues to block 180, where it is checked whether the position of the piston 32 of the hydraulic cylinder 33 of the parking lock actuator 16 has changed positively. If this is not the case, a return is made to block 150. If the position of the piston 32 has changed positively in block 180, the pump 19 is switched off in block 190 and the position of Schaltven valve 25 is classified as faulty in block 200 and an error memory entry is set in block 210. Reference list
1 Hybridantriebsstrang 1 hybrid powertrain
2 Verbrennungsmotor 2 internal combustion engine
3 Abtrieb 3 output
4 Elektromotor 4 electric motor
5 Hybridtrennkupplung 5 hybrid disconnect clutch
6 Elektromotor 6 electric motor
7 Kurbelwelle 7 crankshaft
8 Rotor 8 rotor
9 Kupplungseingang 9 clutch input
10 Kupplungsausgang 10 clutch output
11 Rotor 11 rotor
12 Parksperre 12 parking lock
13 Parksperrenklinke 13 Parking lock latch
14 Parksperrenrad 14 parking lock wheel
15 Gehäuse 15 housing
16 Parksperrenbetätiger 16 parking lock actuators
17 Zwischenwelle 17 intermediate shaft
18 Hydraulikeinrichtung 18 hydraulic equipment
19 Pumpe 19 pump
20 Kühlmittelleitung 20 coolant line
21 Hydraulikflüssigkeit 21 hydraulic fluid
22 Verbraucher 22 consumers
23 Aktuierungsleitung 24 Kupplungsnehmerzylinder23 Actuation line 24 clutch slave cylinders
25 Schaltventil 25 switching valve
26 Elektromotor 26 electric motor
27 Aktorsteuereinheit 28 Hydraulikflüssigkeitsquelle27 Actuator control unit 28 Hydraulic fluid source
29 Drucksensor 29 pressure sensor
30 Leistungselektronik 30 Power Electronics
31 Haltemagnet 31 holding magnet
32 Kolben 33 Hydraulikzylinder 32 pistons 33 hydraulic cylinders
34 Rückstellfeder 34 return spring
35 Gehäuse 35 housing
36 Wegsensor 36 distance sensor
37 Drucksensor 38 Ablassventil 37 Pressure sensor 38 Drain valve

Claims

Patentansprüche Claims
1. Verfahren zur Verifizierung einer Ventilstellung eines Hybridantriebsstranges mit einer Parksperre und mindestens einem Elektromotor, bei welchem ein Hydraulikzylinder (33) der Parksperre (12) zur Entriegelung einer Parks perrenklinke (13) über einen Hydraulikantrieb (19) angesteuert wird, wobei der Hydraulikantrieb (19) ebenfalls einen Kupplungsnehmerzylinder (24) zur Steuerung einer Trennkupplung (5) des Hybridan triebsstranges (1) ansteuert und ein Schaltventil (25) entweder den ersten, die Park sperre (12) enthaltenden hydraulischen Pfad oder einen zweiten, den Kupplungsneh merzylinder (24) umfassenden hydraulischen Pfad mit Hydraulikflüssigkeit (21) ver sorgt, dadurch gekennzeichnet, dass eine Stellung des Schaltventils (25) überwacht wird, indem bei betätigter Hydraulikantrieb (19) ein Druckverhalten in dem Kupplungs nehmerzylinder (24) und/oder eine Positionsänderung eines Kolbens (32) in dem Hyd raulikzylinder (33) der Parksperre (12) ausgewertet wird. 1. A method for verifying a valve position of a hybrid drive train with a parking lock and at least one electric motor, in which a hydraulic cylinder (33) of the parking lock (12) for unlocking a parking lock pawl (13) is controlled via a hydraulic drive (19), the hydraulic drive ( 19) also controls a clutch slave cylinder (24) for controlling a separating clutch (5) of the hybrid drive train (1) and a switching valve (25) either the first hydraulic path containing the parking lock (12) or a second hydraulic path, the clutch slave cylinder (24) ) Provides comprehensive hydraulic path with hydraulic fluid (21), characterized in that a position of the switching valve (25) is monitored by a pressure behavior in the clutch slave cylinder (24) and / or a change in position of a piston ( 32) in the hydraulic cylinder (33) of the parking lock (12) is evaluated.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass nach Einlegen der Park sperre (12) das Schaltventil (25) in Richtung des zweiten, den Kupplungsnehmerzylin der (24) umfassenden hydraulischen Pfades geschaltet wird und die Hydraulikantrieb (19) zur Förderung der Hydraulikflüssigkeit (21) in den Kupplungsnehmerzylinder (24) angetrieben wird, wobei bei einem detektierten Druckanstieg im Kupplungsnehmerzy linder (24) die Stellung des Schaltventils (25) als korrekt erkannt wird. 2. The method according to claim 1, characterized in that after inserting the parking lock (12) the switching valve (25) is switched in the direction of the second, the clutch slave cylinder (24) comprehensive hydraulic path and the hydraulic drive (19) for conveying the hydraulic fluid (21) is driven into the clutch slave cylinder (24), the position of the switching valve (25) being recognized as correct when a pressure increase is detected in the clutch slave cylinder (24).
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass bei eingeschalteter Hydraulikantrieb (19) und einer Stellung des Schaltventils (25) in Richtung des zwei ten, den Kupplungsnehmerzylinders (24) umfassenden hydraulischen Pfades die Posi tionsänderung des Kolbens (32) in dem Hydraulikzylinder (33) der Parksperre (12) überwacht wird, wobei bei einer vorgegebenen Änderung der Position des Kolbens (32) die Stellung des Schaltventils (25) als fehlerhaft erkannt wird. 3. The method according to claim 1 or 2, characterized in that when the hydraulic drive (19) and a position of the switching valve (25) in the direction of the two th, the clutch slave cylinder (24) comprehensive hydraulic path, the posi tion change of the piston (32) in the hydraulic cylinder (33) of the parking lock (12) is monitored, the position of the switching valve (25) being recognized as faulty in the event of a predetermined change in the position of the piston (32).
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass eine Geschwindigkeit der Hydraulikantrieb (19) so eingestellt wird, dass bei einer Position des Kolbens (32) un terhalb einer vorgegebenen Änderung die Parksperrenklinke (13) eingelegt bleibt.4. The method according to claim 3, characterized in that a speed of the hydraulic drive (19) is set so that at a position of the piston (32) below a predetermined change, the parking pawl (13) remains inserted.
5. Verfahren ach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass nach der Bestim mung des Druckanstieges im Kupplungsnehmerzylinder (24) bzw. nach Ermittlung der Positionsänderung des Kolbens (32) des Hydraulikzylinders (33) die Hydraulikantrieb (19) abgeschaltet wird. 5. The method according to claim 1, 2 or 3, characterized in that after the determination of the pressure increase in the clutch slave cylinder (24) or after determining the change in position of the piston (32) of the hydraulic cylinder (33), the hydraulic drive (19) is switched off.
6. Verfahren nach mindestens einem der vorhergehenden Ansprüche, dadurch gekenn zeichnet, dass der Druck direkt an dem Kupplungsnehmerzylinder (24) und die Positi on des Kolbens (32) direkt an dem Hydraulikzylinder (33) gemessen werden. 6. The method according to at least one of the preceding claims, characterized in that the pressure is measured directly on the clutch slave cylinder (24) and the position of the piston (32) directly on the hydraulic cylinder (33).
7. Verfahren nach mindestens einem der vorhergehenden Ansprüche, dadurch gekenn zeichnet, dass ein Ablassventil der Trennkupplung (5) geschlossen wird. 7. The method according to at least one of the preceding claims, characterized in that a drain valve of the separating clutch (5) is closed.
8. Verfahren nach mindestens einem der vorhergehenden Ansprüche, dadurch gekenn zeichnet, dass die Hydraulikantrieb (19) einen weiteren Verbraucher (22) zur Kühlung von zwei Elektromotoren (4, 6) des Hybridantriebsstranges (1) mit der Hydraulikflüs sigkeit (21) versorgt. 8. The method according to at least one of the preceding claims, characterized in that the hydraulic drive (19) supplies a further consumer (22) for cooling two electric motors (4, 6) of the hybrid drive train (1) with the hydraulic fluid (21).
PCT/DE2020/100817 2019-09-23 2020-09-22 Method for the verification of a valve position of a hybrid drive train with a parking lock and at least one electric motor WO2021058060A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080059758.6A CN114303021B (en) 2019-09-23 2020-09-22 Method for verifying a valve position of a hybrid powertrain having a parking lock and at least one electric motor
KR1020227007977A KR20220039811A (en) 2019-09-23 2020-09-22 Parking lock and valve position verification method of hybrid drive train having at least one electric motor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019125503.1 2019-09-23
DE102019125503 2019-09-23

Publications (1)

Publication Number Publication Date
WO2021058060A1 true WO2021058060A1 (en) 2021-04-01

Family

ID=73059353

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2020/100817 WO2021058060A1 (en) 2019-09-23 2020-09-22 Method for the verification of a valve position of a hybrid drive train with a parking lock and at least one electric motor

Country Status (4)

Country Link
KR (1) KR20220039811A (en)
CN (1) CN114303021B (en)
DE (1) DE102020124574A1 (en)
WO (1) WO2021058060A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022108693B3 (en) * 2022-04-11 2023-10-05 Schaeffler Technologies AG & Co. KG Method for operating a parking lock device
DE102022206205A1 (en) * 2022-06-21 2023-12-21 Zf Friedrichshafen Ag Method for monitoring the movement of an actuating piston for engaging or disengaging a parking lock of a vehicle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10259893A1 (en) 2001-12-27 2003-07-17 Luk Lamellen & Kupplungsbau Actuating parking lock of automated gearbox, involves activating parking lock by means of gear selector for automatic gearbox with vehicle stationary or moving at low speed
DE102006050857A1 (en) * 2005-10-31 2007-05-24 General Motors Corp., Detroit Multiplexed pressure switch system for an electrically adjustable hybrid transmission
DE102013213964A1 (en) * 2013-07-17 2015-01-22 Zf Friedrichshafen Ag Method for operating a parking brake system of a transmission and control device for carrying out the method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012010172A1 (en) * 2012-05-15 2013-11-21 Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg Actuator assembly for a motor vehicle powertrain
CN109654216A (en) * 2019-01-29 2019-04-19 东风汽车集团有限公司 The mixed dynamic gear box hydraulic control method and system that parking and clutch integrate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10259893A1 (en) 2001-12-27 2003-07-17 Luk Lamellen & Kupplungsbau Actuating parking lock of automated gearbox, involves activating parking lock by means of gear selector for automatic gearbox with vehicle stationary or moving at low speed
DE102006050857A1 (en) * 2005-10-31 2007-05-24 General Motors Corp., Detroit Multiplexed pressure switch system for an electrically adjustable hybrid transmission
DE102013213964A1 (en) * 2013-07-17 2015-01-22 Zf Friedrichshafen Ag Method for operating a parking brake system of a transmission and control device for carrying out the method

Also Published As

Publication number Publication date
KR20220039811A (en) 2022-03-29
CN114303021B (en) 2023-12-15
CN114303021A (en) 2022-04-08
DE102020124574A1 (en) 2021-03-25

Similar Documents

Publication Publication Date Title
EP1544513B1 (en) Vehicle with a drivetrain having a multiple clutch device
DE102007055916A1 (en) Wired switching system
DE112010000065T5 (en) SHIFT-BY-WIRE SYSTEM
WO2007068319A1 (en) Hydraulic system in motor vehicles
WO2021058060A1 (en) Method for the verification of a valve position of a hybrid drive train with a parking lock and at least one electric motor
WO2022033786A1 (en) Drive device for a motor vehicle, and motor vehicle
DE102018221525A1 (en) Method for controlling an automatic transmission for the purpose of reducing clutch wear and controlled by this automatic transmission
WO2002097290A2 (en) Method for adjusting the contact point of a clutch actuated by a clutch actuator, and control system
DE102018214440A1 (en) Sensor arrangement for a hydraulic system of a transmission
DE102018214433A1 (en) Hydraulic system for a transmission of a motor vehicle drive train
WO2021004571A1 (en) Method for detecting emergency unlocking of a park lock
DE102018131108A1 (en) Method for maintaining a hydraulic fluid pressure level in a hydraulic device
DE102022113487A1 (en) Method for detecting a safe state of a valve in a hydraulic system
DE102006049641B4 (en) motor vehicle
WO2021223799A1 (en) Method for improving the sealing tightness of a valve in a hydraulic circuit of a clutch actuation system
WO2023131364A2 (en) Method for determining a volumetric efficiency, hydraulic system of a motor vehicle drive train, hybrid module, control unit and computer program product
WO2020177803A1 (en) Method for actively changing the frictional value of a hybrid disconnect clutch installed in a powertrain of a vehicle
DE102020101868A1 (en) Method for determining a malfunction of a disconnect clutch
DE102019134552A1 (en) Method for determining a post-cooling time for an electric traction motor driving a vehicle
DE102019006669A1 (en) Method for operating a dual clutch transmission of a motor vehicle, in particular a motor vehicle
EP3114372B1 (en) Method for actuating a hydraulic medium supply system of an automatic transmission
DE112018001409B4 (en) MOTOR CONTROL PROCESS TO IMPROVE THE COLD RESPONSE TIME IN A MOTOR PUMP HYDRAULIC SYSTEM
DE102005019789B4 (en) Detection of a load approach
DE102020111970A1 (en) Method for detecting a fault in a hydraulic clutch actuation system in a drive train of a vehicle
DE102018131335A1 (en) Method for actuating a parking lock in a vehicle

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20800784

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20227007977

Country of ref document: KR

Kind code of ref document: A

122 Ep: pct application non-entry in european phase

Ref document number: 20800784

Country of ref document: EP

Kind code of ref document: A1