DE102017115453A1 - Method and system for the fluidic actuation of two partial clutches - Google Patents

Abstract

The invention relates to a method for the fluidic actuation of two partial clutches (15, 16) of a dual-clutch transmission with the aid of two pump actuators (11, 12) in a fluid system (10).
In order to improve the functionality and / or availability when operating two partial clutches (15, 16), two secondary consumers (18, 19) with the two pump actuators (11, 12) are possibly actuated simultaneously if appropriate.

Description

The invention relates to a method and a system for the fluidic actuation of two partial clutches of a dual-clutch transmission with the aid of two pump actuators.

From the German patent application DE 10 2015 218 784 A1 a fluid assembly for fluidly actuating automotive components is known, of which at least one motor vehicle component is a clutch and at least one other motor vehicle component is a transmission component, wherein the fluid assembly comprises a plurality of fluid flow sources and each of the fluid flow sources comprises a fluid pump having a first delivery direction and a second delivery direction opposite the second Conveying direction, wherein the fluid flow sources are fluidly interconnected in the fluid assembly, that at least one of the fluid flow sources for actuating two of the motor vehicle components and at least one of the fluid flow sources for actuating an operable by another of the fluid power sources motor vehicle component is suitable.

The object of the invention is to improve the functionality and / or availability when operating two partial clutches of a dual-clutch transmission by means of two pump actuators in a fluid system.

The object is achieved in a method for the fluidic actuation of two partial clutches of a dual clutch transmission with the aid of two pump actuators in a fluid system in that two secondary fluidic consumers are optionally actuated simultaneously with the two pump actuators. The pump actuators are preferably electric pump actuators, each of which comprises a fluid pump, in particular a hydraulic pump, which is driven by an electric motor. The electric motor is selectively actuated for actuating one of the partial clutches or the secondary fluidic consumer. The fluid pumps, in particular the hydraulic pumps, are designed as reversing pumps, which can convey fluid in opposite directions, in particular a hydraulic medium. The pump actuators are assigned to the two partial clutches. Parallel to the actuators an AND valve is connected to a tank connection. An OR valve is advantageously connected between the two pump actuators and the secondary consumers. By skillful interconnection of the pump actuators, for example via an actively operable valve means, with the two secondary fluidic consumers, the two pump actuators can be used very effectively in addition to operating the partial clutches for actuating the two secondary fluidic consumers. This provides the advantage that own actuators for the secondary fluidic consumers can be completely eliminated.

A preferred embodiment of the method is characterized in that the two secondary fluidic consumers are a fluidic transmission actuating system and an additional separating clutch. The fluidic transmission actuation system includes, for example, fluidic gait actuators or a fluidic gearing actuator. With the fluidic transmission operating system advantageously two partial transmissions of the dual-clutch transmission are actuated. The additional disconnect clutch is, for example, a K0 clutch in a hybrid powertrain having a primary and a secondary drive. The primary drive is, for example, an internal combustion engine, which is also referred to as an internal combustion engine. The secondary drive is, for example, an electric drive which comprises at least one electric machine or one electric motor. The additional separating clutch is preferably arranged between the primary and the secondary drive. Due to the additional separating clutch of the primary drive can be decoupled to allow a drive solely by the secondary drive, for example, a purely electric drive, equipped with the hybrid powertrain motor vehicle.

A further preferred embodiment of the method is characterized in that the two secondary fluidic consumers are actuated independently of each other by one of the pump actuators. Thus, for example, a pump actuator of a currently not operable partial clutch of the dual-clutch transmission can be used to actuate one of the secondary fluidic consumers. Depending on the design of the fluid system, however, both pump actuators can also be used simultaneously in order to independently actuate both secondary fluidic consumers.

A further preferred embodiment of the method is characterized in that one of the partial clutches is kept in a current state for a period of time, so that during this period both pump actuators can be used for the two secondary fluidic consumers. For example, the partial coupling held in its current state is fluidically decoupled from the fluid system. The decoupling of the sub-clutch from the fluid system is realized, for example, with a suitable valve device, which interrupts a fluid connection between the sub-clutch and its associated pump actuator.

A further preferred embodiment of the method is characterized in that a leakage occurring when holding the partial clutch is compensated by a short-term fluidic connection of the associated pump actuator. The leakage is undesirable in itself, but usually unavoidable. If the clutch pressure drops too much, the associated pump actuator supplies fluid, in particular hydraulic medium, in order to keep the partial clutch in its current state.

A further preferred exemplary embodiment of the method is characterized in that the partial clutch of a partial transmission which is more heavily used during operation of the dual-clutch transmission is fluidically decoupled from the fluid system and only fluidically connected to the associated pump actuator as required. In this embodiment, the sub-coupling is fluidly connected only for actuation with the sub-coupling. In the remaining time, the pump actuator can be used together with the other pump actuator to actuate the secondary fluidic consumers or to supply them with fluid, in particular hydraulic medium.

In a fluid system with two pump actuators for the fluidic actuation of two partial clutches of a dual clutch transmission comprising two partial transmissions, with which gears of the dual clutch transmission are represented, in particular according to a method described above, the above object is alternatively or additionally solved by an actively actuated Valve means between the two pump actuators and two secondary fluidic consumers, in particular the two aforementioned secondary fluidic consumers, is arranged. The active valve device replaces, for example, in a conventional fluid system or a conventional fluid arrangement, as described in German Offenlegungsschrift DE 10 2015 218 784 A1 is known, a passive OR valve. In this case, the increased control effort of the active valve device with respect to the passive OR valve is deliberately accepted.

A preferred embodiment of the fluid system is characterized in that the actively actuable valve device is designed as a 4/2-way valve. The 4/2-way valve has one connection each for the two secondary fluidic consumers. One of the secondary fluidic consumers, for example the fluidic actuation system, can be connected directly to the 4/2-way valve. The other secondary fluidic consumer, for example the additional separating clutch or K0 clutch, is preferably connected to the 4/2-way valve with the interposition of a further blocking valve. The further check valve is preferably designed as a 2/2-way valve with an open position and a closed position. The additional check valve is advantageously biased into its closed position, in which a connection between the 4/2-way valve and the secondary fluidic consumer, for example, the additional separating clutch or K0 clutch, is interrupted. By electromagnetic actuation, the check valve can be switched from its closed position to its open position. About the designed as a 4/2-way valve device, the two secondary fluidic consumers can be actuated simultaneously and depending on the switching position of each of the two pump actuators. In particular, in combination with a check valve described below between one of the partial clutches and the associated pump actuators designed as a 4/2-way valve device allows both secondary fluidic consumers simultaneously to control, resulting in a significant availability and time advantage in one equipped with the fluid system Motor vehicle results. The actively actuated valve device is preferably actuated electromagnetically. The one of the secondary fluidic consumer associated check valve is also referred to as a cut-off valve.

A further preferred embodiment of the fluid system is characterized in that the actively actuable valve device is designed as a 4/4-way valve. The actively actuated valve device is preferably actuated electromagnetically. In the version as 4/4-way valve, the previously described cut-off functionality is integrated with the additional check valve in the actively actuated valve device. By the 4/4-way valve, the following four functions are shown advantageous. Locking the K0 coupling, which is one of the secondary fluidic consumers, to reduce the leakage and connection of the fluidic transmission actuating system, which represents the other secondary fluidic consumer, with a first pump actuator. Locking the K0 coupling to reduce the leakage and connection of the fluidic transmission actuating system with a second pump actuator. Connecting the K0 coupling with the first pump actuator and the fluidic transmission actuating system with the second pump actuator. Connection of the K0 coupling with the second pump actuator and the fluidic transmission actuating system with the first pump actuator.

A particularly preferred embodiment of the actively actuatable valve device designed as a 4/4-way valve is constructed such that, in the case of an exclusive fluidic transmission actuation, no switching position of the valve device must be traversed, in which a connection to the Clutch is opened and thus would leak the pressurized fluid of the K0 clutch. Thus, the fluidic transmission actuating system can be connected to both the first pump actuator and the second pump actuator without having to accept additional leakage at the K0 coupling.

A further preferred embodiment of the fluid system is characterized in that the actively actuated valve device is designed as a rotary slide valve. The rotary valve includes a rotary valve, which can be driven both electrically, for example via a stepper motor, as well as hydraulically. The advantage of the rotary valve is that an increased tightness of the connections can be achieved and thus a complete completion of the K0 coupling is possible. By means of corresponding effective surfaces, the pressure at the K0 coupling can achieve a pressing of the rotary valve for sealing. However, it must be ensured that the corresponding pressure chamber on the active surfaces is leak-free, for example by using a suitable membrane.

A further preferred embodiment of the fluid system is characterized in that a check valve between at least one of the partial clutches and the associated pump actuator is arranged. The check valve is preferably arranged between the sub-coupling and the associated pump actuator. The check valve is preferably designed as a 2/2-way valve with an open position and a closed position. In the open position, a fluid connection between the sub-coupling and the associated pump actuator is released. In the closed position, this fluid communication is interrupted by the check valve to keep the part clutch in its current state.

Another preferred embodiment of the fluid system is characterized in that the check valve is biased in its closed position. As a result, the partial clutch is fluidically decoupled when the check valve is not actuated. Then, the part clutch, apart from an unavoidable leakage, in their operating state, that is kept open or closed. The check valve is preferably actuated electromagnetically, that is switched from its closed position to its open position.

The hydraulic pumps of the pump actuators can be designed as a vane pump, gear pump or piston pump. To drive the pump actuators are advantageously used electric motors. In a first conveying direction, the pump actuators, which are also referred to as reversing pump actuators, can be used, for example, to actuate a partial clutch, in particular to close it. In a second conveying direction, the reversing pump actuators can be used to actuate or supply the secondary fluidic consumer (s) with hydraulic medium. The partial clutches of the double clutch can be operated directly or indirectly. The partial clutches can be wet or dry running.

The invention further relates to a valve device and / or a check valve for a previously described fluid system. The valve device and / or the check valve are separately tradable.

If appropriate, the invention also relates to a component building kit with fluidic components and / or electrical or electromechanical components for the representation of a fluid system described above. The component kit includes, for example, pump actuators, valve devices, check valves, and various fluidic consumers.

• 1 ein Fluidsystem mit zwei Pumpenaktoren zum fluidischen Betätigen von zwei Teilkupplungen eines Doppelkupplungsgetriebes mit einer aktiven Ventileinrichtung, die als 4/2-Wegeventil ausgeführt ist;
• 2 eine aktive Ventileinrichtung, die als 4/4-Wegeventil ausgeführt ist;
• 3 eine konstruktive Ausführung des 4/4-Wegeventils im Längsschnitt;
• 4 ein Fluidsystem mit zwei Pumpenaktoren zum fluidischen Betätigen von zwei Teilkupplungen eines Doppelkupplungsgetriebes mit der aktiven Ventileinrichtung aus 2; und
• 5 ein Fluidsystem mit zwei Pumpenaktoren zum fluidischen Betätigen von zwei Teilkupplungen eines Doppelkupplungsgetriebes mit einer aktiven Ventileinrichtung, die als Drehschieberventil ausgeführt ist.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail. Show it:

• 1 a fluid system with two pump actuators for fluidly actuating two partial clutches of a dual-clutch transmission with an active valve device, which is designed as a 4/2-way valve;
• 2 an active valve device, which is designed as a 4/4-way valve;
• 3 a structural design of the 4/4-way valve in longitudinal section;
• 4 a fluid system with two pump actuators for fluidly actuating two partial clutches of a dual-clutch transmission with the active valve device 2 ; and
• 5 a fluid system with two pump actuators for fluidly actuating two partial clutches of a dual-clutch transmission with an active valve device, which is designed as a rotary slide valve.

In 1 is a fluid system 10 with a first pump actuator 11 and a second pump actuator 12 shown. The pump actuators 11 . 12 are designed as Reversierpumpenaktoren. The reversing pump actuators 11 . 12 are designed as fluid pumps, in particular hydraulic pumps, which, as indicated by arrow symbols, are operable in opposite conveying directions. The reversing pump actuators 11 and 12 allow the operation of a beneficial manner Double coupling 14 and two secondary fluidic consumers 18 . 19 ,

The double clutch 14 includes a first part clutch 15 and a second part clutch 16 , The first part clutch 15 the double clutch 14 is through the pump actuator 11 actuated. The second part clutch 16 the double clutch 14 is through the pump actuator 12 actuated.

The two pump actuators 11 . 12 is each an AND valve 21 . 22 assigned. The AND valve 21 . 22 It is also referred to as a two-pressure valve and has two connections with which the AND valve 21 . 22 to the respective ports of the associated pump actuator 11 . 12 connected. The third port is the AND valve 21 . 22 a tank connection.

Through the AND valve 21 . 22 or two-way valve is made possible in a simple way that with the pump actuators 11 . 12 Direction independent of different operating situations can be displayed.

Through a rectangle symbol 23 is an electric motor drive for the pump actuator 11 indicated. Through a rectangle symbol 24 is an example, pressure-controlled local control unit for the electric motor drive 23 of the pump actuator 11 indicated.

Through a rectangle symbol 25 is an electric motor drive of the pump actuator 12 indicated. Through a rectangle icon 26 is an example, pressure-controlled local control unit for the electric motor drive 25 of the pump actuator 12 indicated.

In a coupling lead 27 the partial clutch 16 is a check valve 28 arranged. The check valve 28 is designed as a 2/2-way valve with a closed position and an open position. By a spring symbol is indicated that the check valve 28 is biased in its illustrated closed position.

In the illustrated closed position interrupts the check valve 28 a fluidic connection between the pump actuator 12 and the partial clutch 16 , When the check valve 28 , as indicated by another symbol, is electromagnetically actuated, then the check valve 28 switched to its open position, in which a fluid connection between the in 1 right output of the pump actuator 12 and the partial clutch 16 is released.

An OR valve 30 is between the two pump actuators 11 and 12 on the one in 1 right side and the secondary fluidic consumer 18 on the in 1 switched on the left side. Via the OR valve 30 can either the pump actuator 11 or the pump actuator 12 the secondary fluidic consumer 18 supply with a fluid flow and a fluid delivery pressure.

At the secondary consumer 18 is it in the 1 and 5 around a fluidic transmission actuation system. The fluidic transmission actuation system may include a gear actuator or a fluidic transmission actuator. At the secondary consumer 19 is it in the 1 and 5 by an additional separating clutch, which is also referred to as K0 clutch.

The two secondary fluidic consumers 18 . 19 are, as seen in the figures of 1, 4 and 5, via an active valve means 30 ; 40 ; 50 fluidly into the fluid system 10 involved. The secondary consumer 18 is via a connection cable 34 to the active valve device 30 ; 40 ; 50 connected. The secondary consumer 19 is via a connection cable 35 to the active valve device 30 ; 40 ; 50 connected.

The pump actuator 11 is via a connection cable 37 to the active valve device 30 ; 40 ; 50 connected. The pump actuator 12 is via a connection cable 36 to the active valve device 30 ; 40 ; 50 connected. The two connection lines 36 and 37 each go from a fluidic branch or a fluidic node 33 . 32 out. The fluidic branches or junctions 33 . 32 are each with the pump actuator 12 . 11 and the parallel connected AND valve 22 . 21 connected.

The term active means with regard to the valve device 30 ; 40 ; 50 in that the valve means 30 ; 40 ; 50 is actively actuated. The actuation of the valve device 30 ; 40 takes place as in the 1 and 4 is indicated by a corresponding symbol, electromagnetic. The actuation of the valve device 50 done as in 5 is indicated by a rectangle, by an electric motor drive.

At the in 1 illustrated embodiment of the fluid system 10 is the active valve device 30 designed as a 4/2-way valve 31. With the 4/2-way valve 31 For example, it is possible to use the secondary fluidic consumer designed as a fluidic actuation system 18 the dual-clutch transmission and the secondary fluidic consumer designed as a K0 clutch 19 at the same time as well as depending on the switching position of the valve device 30 from each of the two electric pump actuators 11 . 12 to press.

In the connection cable 35 to the K0 coupling 19 is also a check valve 38 arranged, which is also referred to as cut-off valve. The check valve 38 is designed as a 2/2-way valve with a closed position and an open position. By a spring symbol is indicated that the check valve 38 is biased in its closed position. When electromagnetic actuation opens the check valve 38 ,

With the in 1 shown fluid system 10 It is possible to use both secondary fluidic consumers 18 . 19 at the same time, whereby a clear availability and time advantage in one with the fluid system 10 equipped motor vehicle results.

Through the check valve 38 can the K0 coupling 19 how to get in 1 sees fluidly from the fluid system 10 be decoupled. So can the K0 coupling 19 be kept in their current state without fluidic actuation. For a fluidic actuation of the K0 coupling 19 becomes the check valve 38 open. Then the K0 coupling can 19 via the active valve device 30 be controlled.

In the 2 and 4 you can see that the active valve device 40 as 4/4-way valve 41 is executed. In this embodiment, the in 1 through the check valve 38 illustrated cut-off functionality in the valve device 40 integrated.

In 3 is a constructive design of the valve device 40 shown. In the illustrated constructive embodiment, the valve device comprises 40 a valve housing 60 with seven connections 61 to 67 , The connections 61 and 62 are the K0 coupling ( 18 in 4 ). The connection 63 is the fluidic transmission actuation system ( 19 in 4 ). The connection 64 is the second pump actuator ( 12 in 4 ). The connection 65 is the first pump actuator ( 11 in 4 ). The connection 66 is also the first pump actuator ( 11 in 4 ). The connection 67 is the second pump actuator ( 12 in 4 ).

In the valve housing 60 is a valve piston 68 against the biasing force of a spring, for example by electromagnetic actuation, back and forth, ie in 3 moved to the left and to the right, added. The valve piston 68 comprises a total of four piston sections which have different dimensions in the axial direction.

The dimensions of the piston sections 71 to 74 of the valve piston 68 are like that with the connections 61 to 67 the valve device 40 that, in the case of an exclusive transmission operation of the secondary fluidic consumer ( 19 in 4 ) no empty positions have to be traversed, in which a connection to the K0 coupling ( 18 in 4 ) is opened and thus the pressurized fluid of the K0 coupling would escape. Thus, the transmission actuating system ( 19 in 4 ) are connected to both the first pump actuator and the second pump actuator without additional leakage occurring at the K0 coupling.

With the active valve device 40 can advantageously have four functions in the operation of the fluid system 10 being represented. The fluidic transmission system (the secondary fluidic consumer ( 19 in 4 ) is also abbreviated to GASS, where the capital letters GASS stand for the English terms Gear Actuated Subsystem.

In a first function, the K0 coupling is disconnected or shut off to reduce the leakage and the GASS via the valve device 40 connected to the first pump actuator. In a second function, the K0 coupling is also shut off or disconnected to reduce leakage, and the GASS via the valve device 40 connected to the second pump actuator. In a third function, the K0 coupling is connected to the first pump actuator and the GASS to the second pump actuator. In a fourth function, the K0 clutch is connected to the second pump actuator and the GASS is connected to the first pump actuator.

In the 5 illustrated valve device 50 is as a rotary valve with a rotary valve 51 executed. The rotary valve 51 is about a drive 52 actuated. The rotary valve 51 is driven by a motor stepper motor, for example. The rotary valve 51 However, it can also be driven fluidically, in particular hydraulically.

The advantage of the rotary valve 51 is that an increased tightness of the connections can be achieved. Thus, a complete complete or uncoupling of the K0 coupling is advantageous 19 possible. The effective pressure surfaces on the K0 coupling can be used 19 used to apply a compressive force on the rotary valve 51 exercise. This pressure force can be achieved by pressing the rotary valve a better seal. However, care should be taken to ensure that the pressure chamber is leak-free at the active surfaces. This can be achieved, for example, by the use of a membrane.

LIST OF REFERENCE NUMBERS

10

fluid system

11

Pumpenaktor

12

Pumpenaktor

14

Double coupling

15

part clutch

16

part clutch

18

secondary consumer

19

secondary consumer

21

AND valve

22

AND valve

23

square symbol

24

square symbol

25

square symbol

26

square symbol

27

clutch supply line

28

check valve

30

active valve device

31

4/2-way valve

32

branch

33

branch

34

connecting cable

35

connecting cable

36

connecting cable

37

connecting cable

38

check valve

40

active valve device

41

4/4-way valve

50

active valve device

51

rotary vane

52

drive

60

valve housing

61

connection

62

connection

63

connection

64

connection

65

connection

66

connection

67

connection

68

plunger

71

piston section

72

piston section

73

piston section

74

piston section

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102015218784 A1 [0002, 0010]

Claims (10)

Method for the fluidic actuation of two partial clutches (15, 16) of a dual-clutch transmission with the aid of two pump actuators (11, 12) in a fluid system (10), characterized in that two secondary consumers (18, 19) are optionally connected to the two pump actuators (11 , 12) are operated simultaneously. Method according to Claim 1 , characterized in that the two secondary fluidic consumers (18, 19) are a fluidic transmission actuating system and an additional separating clutch. Method according to one of the preceding claims, characterized in that the two secondary fluidic consumers (18, 19) are actuated independently of one another by a respective one of the pump actuators (11, 12). Method according to one of the preceding claims, characterized in that one of the partial clutches (15,16) is kept in a current state for a period of time, so that during this period both pump actuators (11,12) for the two secondary fluidic consumers (18, 19) can be used. The fluid system (10) having two pump actuators (11,12) for fluidic actuation of two partial clutches (15,16) of a dual clutch transmission which comprises two component transmissions, with which gears of the dual clutch transmission be represented, in particular according to a method according to any one of the preceding claims, characterized is between the two pump actuators (11,12) and two secondary fluidic consumers (18,19), in particular the two secondary fluidic consumers previously mentioned (18,19), arranged in that an actively operable valve means (50 30; 40;) , Fluid system after Claim 5 , characterized in that the actively actuable valve device (30) is designed as a 4/2-way valve (31). Fluid system after Claim 5 , characterized in that the actively actuable valve device (40) is designed as a 4/4-way valve (41). Fluid system after Claim 5 , characterized in that the actively actuable valve device (50) is designed as a rotary slide valve. Fluid system according to one of Claims 5 to 8th , characterized in that a check valve (28) between at least one of the partial clutches (15,16) and the associated pump actuator (11,12) is arranged. Valve means (30; 40; 50) and / or check valve (28; 38) for a fluid system (10) according to any one of the preceding claims.

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