DE102017213901A1 - Control unit for an automated manual transmission and at least one clutch - Google Patents

Abstract

The invention relates to a control unit (1) for an automated manual transmission and at least one clutch (2, 3) operatively connecting the gearbox to a drive train of a motor vehicle. Here, the clutch (2, 3) via at least one with the clutch (2, 3) connected clutch cooling valve (4) of the control unit (1) a fluid for cooling the clutch (2, 3) can be fed. In addition, the control unit (1) has at least one control valve (5), which is connected to the supply of the fluid with at least one electrically operable with the drive train of the motor vehicle electric machine (6).

Description

The invention relates to a control unit for an automated manual transmission and at least one clutch operatively coupling the transmission with a drive train of a motor vehicle. In this case, a fluid for cooling the clutch can be supplied to the clutch via at least one clutch cooling valve connected to the clutch.

Generating control units are widely used in the field of transmission technology. That's how it describes EP 1 635 092 A1 a hydraulic control device for a shift fork in a manual transmission. By means of the shift fork a gear of the gearbox is switched on or designed accordingly, wherein the shift fork is connected to the piston unit of a shift cylinder, via which the displacement of the shift fork takes place. The control device is designed so that the displacement of the piston unit runs as smoothly as possible.

In the field of automatic transmissions, such as in dual-clutch transmissions, automated control units primarily serve to handle the complex interaction between the components of such an automatic transmission. This is mainly due to the fact that the automatic transmission have a complex mechanical structure and the switching and coupling processes associated with a gear change require just as complex a combination of electrical, electromagnetic, mechanical and hydraulic components.

A hydraulic controller for a dual-clutch transmission, which assumes this function, is provided by the DE 10 2014 216 648 A1 described. Here, the hydraulic energy source of the control device, which is designed as a pump, driven by the internal combustion engine of a particular commercial vehicle and / or arranged in the utility vehicle electric motor. In addition to the operation of the dual clutch, the hydraulic control also allows the cooling of the double clutch. For this purpose, the cooling branch of the double clutch, which is connected to the control, is supplied with hydraulic oil by means of a clutch cooling valve pilot-controlled via a pilot valve. The clutch cooling valve is designed, in particular, as a pressure regulator, which can have a minimum volume flow flowing through the clutch cooling valve for continuous cooling of the dual clutch.

In addition to motor vehicles with internal combustion engine so-called hybrid vehicles have also been established in recent years, which have at least one additional electric motor, which is in addition to the internal combustion engine in addition to the drive of the motor vehicle available. Especially in connection with motor vehicles with an automatic transmission and in particular a dual-clutch transmission, hybrid vehicles offer an optimum combination of comfort and low fuel consumption.

Due to the high power consumption of the electric motor required for driving a motor vehicle, there is usually the need to cool it during operation of the electric motor. The cooling takes place here by a separately running cooling circuit, which disadvantageous increased design effort and space requirements for z. B. additional pumps and also causes higher production costs.

Against this background, the invention has the object to perform a control unit of the type mentioned in such a way that can be dispensed with an additional cooling circuit for cooling the electric motor.

This object is achieved with a control unit according to the features of claim 1. The dependent claims relate to particularly expedient developments of the invention.

According to the invention, therefore, a control unit for an automated manual transmission and at least one clutch operatively coupling the transmission with a drive train of a motor vehicle is provided. Here, the clutch or the clutches on at least one with the clutch or the clutches, in particular hydraulically connected clutch cooling valve of the control unit, a fluid for cooling the clutch or the clutches fed. Furthermore, the control unit according to the invention comprises at least one control valve, which is connected for supplying the fluid with at least one electrically operable with the drive train of the motor vehicle electric machine, in particular hydraulically. By supplying the fluid to the electric machine through the connection of the electric machine to the control unit, it would be extremely advantageous to realize its cooling and / or lubrication without having to provide an additional fluid circuit. Due to the connection with the existing fluid circuit of the control unit for cooling the clutch and the clutches of the automated transmission can be a constructive elegant and economically advantageous solution for cooling and / or lubrication of the electric machine available, the fluid circuit and the control unit In addition, the operation of the clutches and the implementation of switching operations of the gearbox should serve. The fluid itself can in this case be designed as a hydraulic fluid, in particular as hydraulic oil.

The number of as described by the control unit cooled as well as actuated clutches should be at least one, preferably more than one clutch, in particular more than two clutches can be cooled and actuated by the control unit. Two of the clutches could in this case be designed as a double clutch of a dual-clutch transmission.

The electric machine should be designed as an electric motor, which would be mechanically operatively connected by a coupling with the drive train of the motor vehicle. It is conceivable that the fluid in addition to the designed as an electric motor electric machine by means of the control unit is also fed to a clutch which effectively connects the electric machine and the electric motor to the drive train of the motor vehicle.

The control unit, also known as mechatronics module, which operates both mechanically, hydraulically and electronically, thus represents the control center of the automated transmission, the control unit controls in particular switching and clutch operations and / or regulated.

In a furthermore very advantageous development of the invention, the control valve is the clutch cooling valve, which dispenses with a further separately executed control valve and the already used for supplying the fluid for the purpose of cooling the clutches of the automated transmission clutch clutch valve can be used. In addition to economic advantages, this offers a structurally simpler solution with better space utilization, reduced production costs and a lower susceptibility to errors. In this case, it is also within the scope of the possible that the clutch cooling valve itself is designed as a pilot-operated valve, but the clutch cooling valve may be actuated directly.

Another particularly promising embodiment of the invention is characterized in that the control valve has at least three switching positions, whereby correspondingly advantageously the fluid can be supplied only by means of a valve of the electric machine and other components of the control unit and components arranged outside the control unit. Beyond that, in addition, given that the fluid in a first switching position of the control valve of the electric machine, in a second switching position of the control valve of a first clutch and in a third switching position of the control valve of a second clutch can be supplied, it is possible that the fluid two clutches can be supplied in particular for the purpose of cooling the clutches, wherein the first and the second clutch z. B. may be formed as a double clutch of the automated transmission. The first switching position of the control valve should in this case be formed as a center position of the control valve, in which z. B. a displaceably arranged in the control valve against a return element valve piston deflected in a central position over its Gesamtverschiebeweg from a basic position and thereby the fluid of the electric machine can be fed. On the other hand, the second switching position can be formed in that said valve piston of the control valve is in its under the action of the restoring element engaging basic position and thus positioned undeflected or positioned in the third switching position in a maximum position under quasi highest possible deflection from the normal position.

Further, in a further development of the invention, the control valve is preceded by a storage charging valve, by means of which the control valve and / or a high-pressure accumulator is supplied to the accumulator charging valve under a boost pressure, this can be regarded as very profitable, that in a necessary charging of the high-pressure accumulator excessive supply of the fluid for cooling and / or lubrication of the electrical machine and optionally the cooling of the clutches can be prevented, which could lead to a lack of supply of the high-pressure accumulator with the fluid. The accumulator charging valve can thus act as a bypass if necessary, by means of which a supply of the fluid to the control valve can be bypassed. If, on the other hand, it is not necessary to charge the high-pressure accumulator, for example at a sufficiently high accumulator pressure in the high-pressure accumulator, then the fluid, which is virtually surplus and not necessary for the charging process, can be used to cool and / or lubricate the electrical machine and, for example, the cooling by means of the accumulator charging valve upstream of the control valve the first clutch and the second clutch are used. The accumulator charging valve and the control valve could be controlled directly, for example by an actuator, or also, in particular hydraulically, pilot operated. The actuator would be in practical design z. B. designed as an electromagnet, which is an integral part of the control valve or the accumulator charging valve. It would be advantageous if the valve piston has a possible linear dependence of the displacement over its Gesamtverschiebeweg of the current intensity of the electromagnet flowing through electric current.

An embodiment of the invention, which is advantageously advantageous, can also be described by the fact that the fluid applied to the accumulator charging valve is a partial volume flow of the total volumetric flow produced by a pressure generating device, whereby the partial volumetric flow applied to the accumulator charging valve becomes a pressure level which differs from at least one further partial volumetric flow , B. may have the boost pressure for the high-pressure accumulator. In this way, it is made profitably possible that partial fluid circuits of the fluid circuit of the control unit and the components connected to these partial fluid circuits, in particular hydraulically, can be supplied with partial volume flows of differing pressure levels. Accordingly, partial fluid circuits can be formed, which have, for example, a low pressure level or a high pressure level. A sub-fluid circuit lying at the high-pressure level could also be connected to the clutches for carrying out the clutches as well as the shifting operations of the automated transmission, whereas a low-pressure sub-fluid circuit for cooling the clutches may be connected to the clutches. Furthermore, on the one hand, it is conceivable that the total volume flow generated as a whole is effected by the pressure generating device and then divided into partial volume flows via the fluid circuit. On the other hand, however, there would also be the possibility that the total volume flow is already subdivided into partial volume flows when it is effected by the pressure generating device. This may be the case, for example, if the pressure generating device is formed by at least two pumps which generate separate partial volume flows. However, the effecting pumps could include a single drive, such as a torque generating motor, where pumps and motor may also be implemented as one component, such as a motor-pump unit.

A likewise advantageous development of the invention is also given when the accumulator charging valve has a switching hysteresis or the accumulator charging valve has a switching hysteresis, which is formed by a hydraulically generated latching function. In principle, a mechanically generated locking function is conceivable instead of the hydraulically generated locking function of the accumulator charging valve. Compared to a mechanically generated locking function, however, a hydraulically generated locking function offers the advantage that the accumulator charging valve can be exposed to significantly reduced wear and thus can have a longer service life. The switching hysteresis manifests itself here in that the two valve positions of the accumulator charging valve adjust in their height differing control pressures, which act on the accumulator charging valve. As a result, the accumulator charging valve z. B. offset only when a first control pressure threshold from a first valve position to a second valve position and consequently only when falling below a second switching pressure threshold, which is for example at a lower control pressure than the first switching pressure threshold, set back from the second switching position in the first switching position. The switching pressure applied to the accumulator charging valve could be the boost pressure caused by the pressure generating device or else a accumulator pressure present in the high-pressure accumulator. Due to the design of the accumulator charging valve with such a switching hysteresis, it is profitably possible, the voltage applied to the accumulator charging valve under boost pressure, in particular provided via the pressure generating device partial flow of the fluid to differing control pressure levels or control pressure points of the voltage applied to the accumulator charging switching pressure on the High-pressure accumulator or to the control valve to conduct. Due to the alternating supply of the fluid to the high-pressure accumulator or the control valve, the power consumption of the pressure generating device can be reduced particularly advantageously in particular.

If the accumulator charging valve via a pilot valve, in particular as a function of the boost pressure or the accumulator pressure of the high-pressure accumulator, pre-controlled and / or the switching hysteresis, and in particular the switching hysteresis by means of hydraulically generated latching function of the accumulator charging valve, by the accumulator charging valve vorsteuernde pilot valve, so can profitably on the one hand, the fluid are under high load pressures, which would not be switchable by a directly controlled accumulator charging valve and on the other hand can be unwanted intermediate positions of the accumulator charging valve and thus possibly avoid inconsistent switching behavior of the accumulator charging valve. It is conceivable that the accumulator charging valve and the pilot valve integrally formed, d. H. For example, in a housing, are executed and thus may be in the form of a cartridge valve or cartridge valve.

From an extremely promising embodiment of the invention can also be assumed, when a the electrical machine associated and connected to the control valve pressure port of the control unit with the pressure generating device, in particular hydraulically connected and / or the connection of the, here the electric machine associated pressure port and the Pressure generating device one, preferably the volume flow to or from the pressure port reducing, throttle is interposed. This would be beneficial to a steady, independent and allow permanent cooling and / or lubrication of the electrical machine. The connection between the pressure connection of the control unit and the pressure generating device can take place via a hydraulic line formed in the control unit. By introducing a throttle in the connection between the pressure connection and the pressure generating device could be supplied, for example, via the hydraulic line or also discharged volume flow, which z. B. may be a not standing under boost pressure partial flow, limit its height. For this purpose, a diaphragm reducing the cross section of the hydraulic line can be introduced into the hydraulic line or the hydraulic line has such a small cross section that it itself fills the function of the throttle.

An embodiment of the invention is also extremely useful if the pressure connection of the control unit associated with the electrical machine with the accumulator charging valve, in particular hydraulically connected and / or the connection of the, here the electric machine associated pressure port and the accumulator charging valve, preferably the flow rate of the pressure connection mitigating, throttle is interposed. This is particularly advantageous in that a partial flow of the fluid additionally supplied to the control valve, which is not the partial volume flow supplied via the accumulator charging valve and under the boost pressure, is to be limited in height so that the partial volume flow is not completely discharged to the electric machine and / or the clutches is supplied.

The connection between the pressure connection of the control unit and the accumulator charging valve can also take place via a hydraulic line formed in the control unit. By introducing a throttle into the connection between the pressure connection and accumulator charging valve, the volume flow discharged via the hydraulic line from the pressure connection could be limited in its height. For this purpose, in turn can be introduced in the hydraulic line a cross-section of the hydraulic line diminishing diaphragm or the hydraulic line has such a small cross-section that it itself fills the function of the throttle.

If, furthermore, the pressure connection associated with the electrical machine is connected to a tank, in particular hydraulically, in a storage charging position of the accumulator charging valve via the accumulator charging valve, then it can be assumed that advantageously, for example. Excess fluid from the electric machine and / or the couplings in the tank, so called a low-pressure accumulator for the fluid, also called sumpft, recycled and / or too low fluid level in the tank due to excessive supply of fluid to the electric machine and / or the clutches can be avoided during the necessary supply of fluid to the high-pressure accumulator. In the accumulator charging position, which is one of the valve positions of the accumulator valve already shown, the supply of fluid to the control valve would be disabled and the accumulator charging valve could act as a bypass so that the high pressure accumulator would be charged with the fluid.

• 1 einen Hydraulikschaltplan einer erfindungsgemäßen Weiterbildung der Steuereinheit;
• 2a, 2b Darstellungen von Volumenstromverläufen;
• 3a, 3b Darstellungen von Volumenstromverläufen.

The invention allows numerous embodiments. To further clarify its basic principle, one of them is shown in the drawing and will be described below. This shows in

• 1 a hydraulic circuit diagram of a development of the control unit according to the invention;
• 2a . 2 B Representations of volumetric flows;
• 3a . 3b Representations of volume flow curves.

1 shows a hydraulic circuit diagram of a development of the control unit according to the invention 1 , This is for the purpose of cooling the couplings 2 . 3 and for the purpose of cooling and lubricating the electrical machine designed as an electric motor 6 the couplings 2 . 3 as well as the electric machine 6 via the control valve 5 , which serves as the clutch cooling valve 4 is formed, designed as a hydraulic oil fluid supplied. For this purpose, the control valve 5 three switch positions 7 . 8th . 9 on, wherein in the first switching position 7 of the control valve 5 the control valve 5 over the hydraulic line 19 with that of the electric machine 6 associated pressure port 14 hydraulically connected. In the second switching position 8th of the control valve 5 this is on the other hand via the hydraulic line 20 with the first clutch 2 and in the third switching position 9 over the hydraulic line 21 with the second clutch 3 hydraulically connected. Thus, the cooling and lubrication of the electric machine in the first switching position 7 of the control valve 5 , the cooling of the first clutch 2 in the second switching position 8th of the control valve 5 and the cooling of the second clutch 3 in the third switching position 9 of the control valve 5 , wherein the first switching position 7 the center position of the control valve 5 equivalent. The control valve 5 is still that through the pilot valve 13 pilot operated accumulator charging valve 10 upstream, by means of which at the accumulator charging valve 10 under a boost pressure applied fluid and in particular a partial flow of the through the pressure generating device 12 generated total volume flow to the control valve 5 or the high-pressure accumulator 11 depending on the valve position of the accumulator charging valve 10 is supplied. This is the control valve 5 over the hydraulic line 22 and the high-pressure accumulator 11 over the hydraulic line 23 , the check valve 38 and the hydraulic line 24 with the accumulator charging valve 10 hydraulically connected. It is in the storage loading position 17 of the accumulator charging valve 10 the flow of fluid from the hydraulic line 23 to the hydraulic line 22 locked, so that the under-pressurized fluid, the check valve 38 opens and the high-pressure accumulator 11 over the hydraulic line 24 is supplied. In addition to the storage loading position 17 is as a second valve position of the accumulator charging valve 10 the cooling position 43 feasible, in which the hydraulic line 22 with the hydraulic line 23 via the accumulator charging valve 10 hydraulically connected. The pressurized fluid, especially the accumulator charging valve 10 adjoining partial volume flow of the fluid is through the pressure generator 12 causes and lies over the hydraulic lines 23 . 25 and the intermediate filter 40 at the storage loading valve 10 at. This at the store loading valve 10 adjoining partial volume flow is through the first pump 35 the pressure generating device 12 caused, wherein the pressure generating device 12 also the second pump 36 as well as the pumps 35 . 36 motor driving at a variable speed 37 having. Moreover, one is through the pump 37 bewirkter further volume flow of the fluid, which is under a cooling pressure, the control valve 5 over the radiator 42 as well as the filter 41 and the respective connecting hydraulic lines 22 . 26 . 27 fed. Furthermore, that of the electric machine 6 assigned and with the control valve 5 connected pressure connection 14 the control unit 1 with the pressure generating device 12 over the hydraulic lines 28 and 29 hydraulically connected, the connection of pressure port 14 and the pressure generating device 12 the throttle 15 between the hydraulic lines 28 . 29 is interposed. The pressure connection 14 is also with the accumulator charging valve 10 over the hydraulic lines 30 and 31 and the intermediate throttle 16 hydraulically connected, in turn, the pressure port 14 in the storage loading position 17 of the accumulator charging valve 10 thereby via the accumulator charging valve 10 with the tank 18 hydraulically connected.

2a and 2 B represent qualitatively depending on the likewise in 1 illustrated switch positions 7 . 8th . 9 of in 1 described control valve 5 adjusting volume flows of the fluid. This shows 2a Volume flows of the fluid, which in the in 1 indicated storage loading position 17 of the accumulator charging valve 10 to adjust, 2 B Volume flow of the fluid, which is also in the 1 described cooling position 43 of the accumulator charging valve 10 to adjust. In both figures, these adjusting volumetric flows are also dependent on different speeds n1 . n2 . n3 of in 1 indicated engine 37 the pressure generating device 12 shown. The switch positions 7 . 8th . 9 also correspond to the actuator of the control valve 5 flowing electric current IVKU wherein the actuator would be designed as an electromagnet. It can be seen that with increasing current IVKU the switch position 8th in the switching position 7 and then in the switching position 9 passes. 2a includes the first clutch volume flow QK1 for cooling the first clutch 2 , the second clutch volume flow QK2 for cooling the second clutch 3 , the tank volume flow QT to the tank 18 as well as the machine volume flow QE for cooling and lubrication of the electric machine 6 at the appropriate speeds n1 . n2 . n3 , On the other hand 2 B only the coupling volume flows QK1 . QK2 as well as the machine volume flow QE , because in the cooling position 43 of the accumulator charging valve 10 no supply of fluid to the tank 18 via the accumulator charging valve 10 he follows. With increasing speeds n1 . n2 . n3 rise as well as the clutch volume flows QK1 . QK2 , the machine volume flow QE as well as the tank volume flow QT at.

3a and 3b also show qualitative volume flow characteristics. These are in 3a and 3b depending on the speed n of in 1 described engine 37 the pressure generator unit 12 shown. 3a shows the curves of the flow rates in the first switching position 7 of in 1 illustrated control valve 5 , 3b on the other hand shows volume flows, which in the second switching position 8th or the third switch position 9 of the control valve 5 available. Of the 3a on the one hand is the tank volume flow QT as well as the machine volume flow QE in the storage loading position 17 of the accumulator charging valve 10 and on the other hand the engine volumetric flow QE in cooling position 43 of the accumulator charging valve 10 refer to. 3b represents the engine cooling flow QE which is about the in 1 explained connection between pressure connection 14 and pressure generating means 12 over the throttle 15 as well as the hydraulic lines 28 . 29 results. In addition, the representation of the first clutch volume flow QK1 or the second clutch volume flow QK2 to see which are not present together next to each other. In addition, a total volume flow is shown, which is the sum of the first clutch volume flow QK1 or second clutch volume flow QK2 and the machine volume flow QE equivalent.

LIST OF REFERENCE NUMBERS

1

control unit

2, 3

clutch

4

Clutch cooling valve

5

control valve

6

Electric machine

7, 8, 9

switch position

10

Accumulator charging valve

11

High-pressure accumulator

12

Pressure generating means

13

pilot valve

14

pressure connection

15, 16

throttle

17

Memory loading position

18

tank

19, 20, 21

hydraulic line

22, 23, 24

hydraulic line

25, 26, 27

hydraulic line

28, 29, 30

hydraulic line

31

hydraulic line

35, 36

pump

37

engine

38

check valve

40.41

filter

42

cooler

43

cooling position

n

rotation speed

n1, n2, n3

rotation speed

IVKU

electricity

QE

Machinery volume flow

QK1

Coupling Flow

QK2

Coupling Flow

QT

Tank volume flow

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

• EP 1635092 A1 [0002]
• DE 102014216648 A1 [0004]

Claims (10)

Control unit (1) for an automated manual transmission and at least one clutch (2, 3) operatively connecting the transmission to a drive train of a motor vehicle, wherein the clutch (2, 3) has at least one clutch cooling valve (4) connected to the clutch (2, 3). the control unit (1) a fluid for cooling the clutch (2, 3) can be fed, characterized in that the control unit (1) has at least one control valve (5), which for supplying the fluid with at least one operatively connected to the drive train of the motor vehicle electrical machine (6) is connected. Control unit (1) after Claim 1 , characterized in that the control valve (6) is the clutch cooling valve (5). Control unit (1) after the Claims 1 or 2 , characterized in that the control valve (5) has at least three switching positions (7, 8, 9) and / or the fluid in a first switching position (8) of the control valve (5) of the electric machine (6), in a second switching position ( 7) of the control valve (5) of a first clutch (2) and in a third switching position (9) of the control valve (5) of a second clutch (3) can be fed. Control unit (1) according to at least one of the preceding claims, characterized in that the control valve (5) is preceded by a storage charging valve (10), by means of which at the accumulator charging valve (10) under a boost pressure applied fluid to the control valve (5) and / or a High-pressure accumulator (11) is supplied. Control unit (1) according to at least one of the preceding claims, characterized in that the fluid applied to the accumulator charging valve (10) is a partial volume flow of the total volume flow produced by a pressure generating device (12). Control unit (1) according to at least one of the preceding claims, characterized in that the accumulator charging valve (10) has a switching hysteresis or the accumulator charging valve (10) has a switching hysteresis, which is formed by a hydraulically generated latching function. Control unit (1) according to at least one of the preceding claims, characterized in that the accumulator charging valve (10) is pilot-controlled via a pilot valve (13) and / or the switching hysteresis of the accumulator charging valve (10) by the accumulator charging valve (10) pilot-controlling the pilot valve (13) is effected. Control unit (1) according to at least one of the preceding claims, characterized in that one of the electrical machine (6) and associated with the control valve (5) connected pressure port (14) of the control unit (1) connected to the pressure generating device (12) and / or the connection of the pressure port (14) and the pressure generating device (12) a throttle (15) is interposed. Control unit (1) according to at least one of the preceding claims, characterized in that the electric machine (6) associated pressure port (14) of the control unit (1) connected to the accumulator charging valve (10) and / or the connection of the pressure port (14) and the accumulator charging valve (10) has a throttle (16) interposed. Control unit (1) according to at least one of the preceding claims, characterized in that the pressure connection (14) associated with the electric machine (6) in a storage charging position (17) of the accumulator charging valve (10) via the accumulator charging valve (10) with a tank (18). connected is.

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