DE102011005529A1 - Method for preventing tooth-on-tooth position during closing of claw switching element of dual clutch transmission in countershaft design, involves determining difference in rotational speeds of sides and phase position of claws - Google Patents

Abstract

The method involves determining the difference in the rotational speeds of the primary- and secondary sides of a claw switching element (26) and the phase position of the claws of the claw switching element to each other. The time of the actuation of the claw switching in the closing direction according to the phase position of the claws of the claw switching element and the difference of the rotational speeds of the primary- and secondary sides are determined together such that a tooth-on-tooth position is avoided.

Description

The invention relates to a method for avoiding a tooth-on-tooth position when closing a jaw switching element of a dual-clutch transmission or an automated manual transmission in countershaft design according to the preamble of patent claim 1.

Essentially, a dual-clutch transmission of two strands or partial transmissions with different gear pairs, two power shift clutches each associated with a partial transmission, a drive shaft and an output shaft and, depending on the number of gears from claw switching elements. Here, the gears are arranged alternately in the two partial transmissions, so that it is possible to preselect a gear in the load-free partial transmission, while the torque is transmitted from the other partial transmission.

In automated manual transmissions, it is known from the prior art to use synchronizers which disadvantageously lead to high fuel consumption and to an increase in weight and manufacturing and assembly costs. Furthermore, it is known from the prior art to use in automated manual transmissions unsynchronized claw switching elements, wherein a synchronization is performed for example by means of a transmission brake and the controlled clutch of the automated manual transmission.

When closing a jaw switching element in a dual-clutch transmission or an automated manual transmission, a compromise between comfort and speed of the circuit must be selected according to the prior art in the rule. To make such a circuit comfortable, the difference in the rotational speeds of the primary and secondary side should be as low as possible; this results in a low momentum exchange, which in turn results in a comfort increase; disadvantageously, however, a small difference in the rotational speeds of the primary and secondary sides when closing a jaw switching element in the case of a tooth-on-tooth position to a long switching time, which is needed until the next gap appears or until the tooth-on Tooth position is canceled.

Furthermore, the detection and cancellation of a tooth-on-tooth position requires the activation of monitoring functions and a special control of transmission components, which disadvantageously increases the design effort.

For example, goes from the DE 197 56 637 A1 the Applicant a switching device for connecting rotating at different speeds components of a transmission with at least one switching group, said in operation of the transmission device, a current operating state of at least one positive switching element having switching group is monitored, wherein in the presence of a tooth-on-tooth position of the to be connected toothing the synchronizing force in the region of the positive switching element is minimized to produce a drag torque during the synchronization of the positive locking element to be closed, by means of which the tooth-on-tooth position should be canceled.

Furthermore, from the DE 10 2009 000 254 A1 the applicant a method for operating a transmission device of a vehicle drive train with at least one prime mover known, wherein the transmission device is designed to display different translations with at least one positive switching element and a plurality of frictional switching elements and during a closing operation of the positive switching element starting from an open operating state and in the presence of a Intermediate operating state of the form-locking switching element to which a positive connection between the switching element halves of the form-fitting switching element by a tooth-on-tooth position prevents at least temporarily a speed difference between the switching element halves is generated to which the positive connection in the region of the positive switching element is inserted. It is provided that for the production of the speed difference between the switching element halves of the form-locking switching element at least the transmission capacity of a frictional switching element is raised.

For this reason, it is desirable not only the difference of the rotational speeds of the primary and secondary side of a claw switching element via an active synchronization and the already existing usually sensors on the input and output side, for example via the operation of a transmission brake or an electric motor or a controlled clutch, but also to influence the phase position of the claws of the primary and secondary side of the jaw switching element to each other, which is a clash of clutches with very little difference in the rotational speeds of the primary and secondary side without the risk of the occurrence of a tooth-on-tooth contact would allow.

To determine the phase position of the claws, corresponding sensors could be provided directly in the vicinity of the primary and secondary sides of the jaws; However, this procedure results in high manufacturing and assembly costs. In addition, the space required for the sensors is generally not available.

The present invention has for its object to provide a method for avoiding a tooth-on-tooth position when closing a claw switching element of a dual clutch transmission or an automated manual transmission in countershaft design, by its implementation, a tooth-on-tooth position avoided with little design effort can be. In particular, should be used to carry out the method according to the invention as many as possible already existing sensors of the transmission.

This object is solved by the features of patent claim 1. Further embodiments and advantages of the invention will become apparent from the dependent claims.

Accordingly, a method for avoiding a tooth-on-tooth position when closing a jaw switching element of a jaw switching element of a dual-clutch transmission or an automated manual transmission in countershaft design proposed, in the context of the difference in rotational speeds of the primary and secondary side of the jaw switching element and the phase position of the jaws of the jaw switching element are determined to each other, wherein the timing of the operation of the jaw switching element in the closing direction in response to the phase angle of the jaws of the jaw switching element to each other and the difference in rotational speeds of the primary and secondary side is determined such that a tooth-on-tooth position is avoided.

The invention will be explained in more detail below by way of example with reference to the attached figures. Show it:

1 : A schematic representation of a claw switching elements comprehensive dual-clutch transmission for illustrating the method according to the invention;

2 : A schematic representation of a claw switching elements comprehensive automated manual transmission in a simple countershaft design to illustrate the method according to the invention; and

3 : A schematic representation of the design of the contact geometry of the claws according to a development of the invention.

The construction of dual-clutch transmissions and automated manual transmissions is well known to those skilled in the art, so that in the description of the figures, only the components relevant to the invention are described and explained.

In 1 is a running according to the prior art dual-clutch transmission 1 represented, wherein the partial transmissions are executed in Vorgelegebauweise.

The dual-clutch transmission shown comprises a first partial transmission 2 and a second partial transmission 3 with different gear pairs for generating the gear ratios, a first part of the transmission 2 assigned power shift clutch 4 and a second partial transmission 3 assigned power shift clutch 5 , An unillustrated, with the engine, which is usually designed as an internal combustion engine, connected drive shaft and a countershaft 9 as well as unsynchronized claw switching elements 6 , The couplings 4 and 5 Here are summarized structurally to a double clutch.

Referring to 1 includes the dual-clutch transmission 1 a first input shaft designed as a solid shaft 7 for the first partial transmission 2 connected to the output side of the clutch 4 is connected and a second designed as a hollow shaft input shaft 8th for the second partial transmission 3 , which with the output side of the clutch 5 connected is.

In the example shown are on the countershaft 9 the loose wheels 13 . 14 . 15 . 16 . 17 , and 18 of the dual-clutch transmission 1 arranged with corresponding fixed wheels 19 . 20 . 21 . 22 . 23 respectively. 24 the input shafts 7 . 8th comb.

In such running gearboxes are usually both on the input side, ie on the input shaft 7 of the first partial transmission 2 and the input shaft 8th of the second partial transmission 3 - As well as on the output side, ie on the countershaft 9 preferably as Hall sensors 10 . 11 . 12 executed speed sensors used, which determine the phase position of a respectively evaluated encoder teeth; disadvantageously, this information can not due to the gear stages and the different numbers of teeth between the sensors and the claws for the phase position of the claws of the jaw switching elements 6 be used to each other.

According to the invention, the phase positions of the loose wheels of a shaft 7 . 8th . 9 a dual-clutch transmission 1 rotatably connected parts of the claw switching elements 6 as well as the phase angles of a wave 7 . 8th . 9 of the dual-clutch transmission 1 rotatably connected parts of the claw switching elements 6 determined, in which case the phase positions of the non-rotatably connected to a shaft parts of the claw switching elements 6 and the non-rotatably connected to the idler gears parts of the jaw switching elements 6 to each other, ie the phase angles of the claws of the jaw switching elements are determined to each other.

According to a variant of the method is proposed for determining the phase position of a loose wheel of a shaft 7 . 8th . 9 a dual-clutch transmission rotatably connected part of a claw switching element 6 in the event that the idler gear and the non-rotatably connected to the idler gear part of the jaw switching element 6 have the same number of teeth to use the signals of a arranged directly on the idler speed sensor. The phase angle of the shaft 7 . 8th . 9 rotatably connected corresponding part of the claw switching element 6 is based on one with the wave 7 . 8th . 9 rotatably connected sensor 10 . 11 . 12 determined, so that the phase angles of the parts of the jaw switching elements 6 can be determined to each other.

Here, the idler wheels associated speed sensors can also be placed directly on the corresponding fixed gear, the phase position of the associated with the respective idler gear parts of the jaw switching elements based on the signals of the speed sensors and the number of teeth of the fixed wheels and the respective idler gears is determined.

In the event that the idler gear does not have the same number of teeth as the non-rotatably connected to the idler gear part of the claw switching element, the signals of a the phase position of a arranged on the idler gear measuring wheel sensor to determine the phase position of a idler gear rotatably connected part of a claw switching element used, wherein the measuring wheel has the same number of teeth as the non-rotatably connected to the idler gear part of the claw switching element.

In the event that all arranged on a shaft idler gears have the numbers of teeth associated with the respective idler gear rotatably connected parts of the jaw switching elements, it is proposed to use the signal of a speed sensor which is rotatably mounted on the shaft on which the idler gears associated Fixed wheels are arranged; this sensor can advantageously be provided according to the prior art anyway, the shaft associated Hall sensor.

At the in 1 Example shown is therefore to determine the phase position of the loose wheels 13 . 14 . 15 of the second partial transmission 3 rotatably connected parts of the associated claw switching elements 6 the signal of the already existing sensor 10 used, wherein to determine the phase position of the loose wheels 16 . 17 . 18 of the first partial transmission 2 rotatably connected parts of the associated claw switching elements 6 the signal of the already existing sensor 11 is used.

The phase position of the associated with the respective idler gear parts of the claw switching elements is determined based on the signals of the respective speed sensor and the numbers of teeth of the fixed gears and the associated idler gears.

The phase of the with a wave 7 . 8th . 9 the gear rotatably connected parts of the claw switching elements 6 is based on one with the respective wave 7 . 8th . 9 rotatably connected sensor 10 . 11 . 12 determined. Here exists for the phase position with a wave 7 . 8th . 9 the transmission rotatably connected parts of the claw switching elements in gear engaged a finite number of states, by unique phase relationships between the on the respective shaft 7 . 8th respectively. 9 rotatably mounted sensor and the one with a shaft 7 . 8th . 9 the gear rotatably connected parts of the claw switching elements 6 are determined.

Is in a partial transmission 2 . 3 a gear is engaged, so is the associated phase relationship between that on the respective shaft 7 . 8th respectively. 9 rotatably mounted sensor 10 . 11 . 12 and the one with a wave 7 . 8th . 9 the gear rotatably connected parts of the claw switching elements 6 known in this sub-transmission, whereby the phase angles of the shaft non-rotatably connected parts of the claw switching elements 6 and the non-rotatably connected to the idler gears parts of the jaw switching elements 6 can be determined to each other.

In an automated manual transmission, the procedure according to the invention presented for a dual-clutch transmission procedure. An automated manual transmission corresponds to a partial transmission of a dual-clutch transmission.

In 2 is an automated manual transmission 25 shown in a simple countershaft design, which claw switching elements 26 includes that on the countershaft 27 are arranged and the non-rotatable connection of the countershaft 27 arranged loose wheels 28 serve; with the output side of the clutch 29 connected input shaft on which the loose wheels 18 assigned fixed wheels 30 are arranged, is denoted by the reference numeral 31 Mistake. On the input shaft 31 is a speed sensor 32 arranged; furthermore, is on the counterwave 27 another speed sensor 33 intended.

If all on the counter-wave 27 arranged loose wheels 28 the number of teeth of the associated with the respective idler gear 28 rotatably connected parts of the claw switching elements 26 have, as already explained for the case of a dual-clutch transmission, to determine the phase position of the idler wheels 28 connected parts of the claw switching elements 26 the signal of the on the input shaft 31 arranged speed sensor 32 and the numbers of teeth on the input shaft 31 arranged fixed wheels 30 and the respective loose wheels 28 for the calculation of the phase position relative to the loose wheels 28 used.

The determination of the phase position of the countershaft 27 rotatably connected parts of the claw switching elements 26 takes place in that when engaged gear, the associated phase relationship between the on the countershaft 27 rotatably mounted sensor 33 and the one with the countershaft 27 rotatably connected parts of the claw switching elements 26 is known.

From the thus known phase position with the countershaft 27 rotatably connected parts of the claw switching elements 26 and the determined phase position of the loose wheels 28 connected parts of the claw switching elements 26 can the phase angle of the parts of the jaw switching elements 26 be determined to each other.

It is particularly advantageous if, during a gear change, the signals of the sensors are further tracked, whereby the phase position between the parts of the switching element required for the new gear is already known during meshing. The values of the sensor signals can also be stored when the vehicle is parked and used to restart the vehicle.

According to the invention, the timing of the operation of a claw switching element in the closing direction in dependence on the phase angle of the jaws of the jaw switching element to each other and the difference in the rotational speeds of the primary and secondary side is determined such that a tooth-on-tooth position is avoided; the axial movement of the shift sleeve of the claw switching element takes place until the track is reproducible in a narrow time window.

In a further development of the invention, the course of the axial position of the shift sleeves of the claw switching elements can be detected after the triggering of a circuit, wherein deviations from the desired course either by correcting the operation of the claw switching elements themselves, for example, when electromotive actuation via a position or speed control, or alternatively be corrected by a controllable brake or an electric machine on one of the involved shafts of the transmission.

According to a further embodiment of the invention and with reference to 3 the meshing behavior of the claws of the claw switching elements can be improved by the fact that the claw geometry of the axially non-displaceable part 34 the jaw switching elements is convex and has a contour which the relative movement of the axially displaceable part 35 the claw switching element to the axially non-displaceable part 34 with successful meshing corresponds to the in 3 through the arrow 36 is illustrated.

LIST OF REFERENCE NUMBERS

1

Double clutch

2

first partial transmission

3

second partial transmission

4

first power shift clutch

5

second power shift clutch

6

Claw shifting element

7

Input shaft of the first sub-transmission 2

8th

Input shaft of the second partial transmission 3

9

Countershaft

10

Hall sensor

11

Hall sensor

12

Hall sensor

13

Losrad

14

Losrad

15

Losrad

16

Losrad

17

Losrad

18

Losrad

19

fixed gear

20

fixed gear

21

fixed gear

22

fixed gear

23

fixed gear

24

fixed gear

25

automated manual transmission

26

Claw shifting element

27

Countershaft

28

Losrad

29

clutch

30

fixed gear

31

Input shaft of the automated manual transmission 25

32

Speed sensor

33

Speed sensor

34

axially non-displaceable part of a claw switching element

35

axially displaceable part of a claw switching element

36

Relative movement of the axially displaceable part 35 the claw switching element to the axially non-displaceable part 34

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 19756637 A1 [0006]
• DE 102009000254 A1 [0007]

Claims (7)

Method for avoiding a tooth-on-tooth position when closing a jaw switching element (US Pat. 6 . 26 ) of a dual-clutch transmission ( 1 ) or an automated manual transmission ( 25 ) in Vorgelegebauweise, characterized in that the difference in the rotational speeds of the primary and secondary side of the claw switching element ( 6 . 26 ) and the phase position of the claws of the jaw switching element to each other are determined, wherein the time of actuation of the jaw switching element ( 6 . 26 ) in the closing direction as a function of the phase position of the claws of the jaw switching element ( 6 . 26 ) To each other and the difference in the rotational speeds of the primary and secondary side is determined such that a tooth-on-tooth position is avoided. Method for avoiding a tooth-on-tooth position when closing a jaw switching element (US Pat. 6 . 26 ) of a dual-clutch transmission ( 1 ) or an automated manual transmission ( 25 ) in Vorgelegebauweise, according to claim 1, characterized in that the phase positions of the with the loose wheels of a shaft ( 7 . 8th . 9 . 27 . 31 ) of the dual-clutch transmission ( 1 ) or the automated manual transmission ( 25 ) in countershaft construction rotatably connected parts of the claw switching elements ( 6 . 26 ) and the phase positions of a wave ( 7 . 8th . 9 . 27 . 31 ) of the dual-clutch transmission ( 1 ) or the automated manual transmission ( 25 ) in countershaft construction rotatably connected parts of the claw switching elements ( 6 . 26 ), wherein subsequently the phase positions of the shaft non-rotatably connected parts of the claw switching elements ( 6 . 26 ) and the non-rotatably connected to the idler gears parts of the claw switching elements ( 6 . 26 ) are determined to each other. Method for avoiding a tooth-on-tooth position when closing a jaw switching element (US Pat. 6 . 26 ) of a dual-clutch transmission ( 1 ) or an automated manual transmission ( 25 ) in Vorgelegebauweise, according to claim 2, characterized in that for determining the phase position of a loose wheel of a shaft ( 7 . 8th . 9 . 27 . 31 ) of a dual-clutch transmission ( 1 ) or an automated manual transmission ( 25 ) in countershaft construction rotatably connected part of a claw switching element ( 6 . 26 ) in the event that all on a wave ( 7 . 8th . 9 . 27 . 31 ) arranged idler gears, the numbers of teeth of the associated with the respective idler gear rotatably connected parts of the claw switching elements ( 6 . 26 ), the signal of a speed sensor ( 10 . 11 . 32 ) is used, which is rotatably mounted on the shaft on which the loose wheels associated fixed wheels are arranged, wherein the phase position of the associated with the respective idler gear parts of the claw switching elements ( 6 . 26 ) based on the signals of the respective speed sensor ( 10 . 11 . 32 ) and the number of teeth of the fixed wheels and the associated loose wheels is determined, wherein the phase position of a shaft ( 7 . 8th . 9 . 27 ) of a dual-clutch transmission ( 1 ) or an automated manual transmission ( 25 ) rotatably connected parts of the claw switching elements ( 6 . 26 ) based on one with the respective wave ( 7 . 8th . 9 . 27 ) non-rotatably connected sensor ( 10 . 11 . 12 . 33 ) is determined when the gear is engaged, wherein when in a partial transmission ( 2 . 3 ) of a dual-clutch transmission ( 1 ) or in the automated manual transmission ( 25 ) a gear is engaged, the associated phase relationship between that on the respective shaft ( 7 . 8th . 9 . 27 ) non-rotatably arranged sensor ( 10 . 11 . 12 . 33 ) and with a wave ( 7 . 8th . 9 . 27 ) of the transmission ( 2 . 3 . 25 ) rotatably connected parts of the claw switching elements ( 6 . 26 ), whereby the phase positions of the parts of the claw switching elements (2) 6 . 26 ) and the non-rotatably connected to the idler gears parts of the claw switching elements ( 6 . 26 ) are mutually determinable. Method for avoiding a tooth-on-tooth position when closing a jaw switching element (US Pat. 6 . 26 ) of a dual-clutch transmission ( 1 ) or an automated manual transmission ( 25 ) in countershaft design, according to claim 3, characterized in that the sensors ( 10 . 11 . 12 . 32 . 33 ) existing speed sensors of the transmission ( 1 . 25 ) are. Method for avoiding a tooth-on-tooth position when closing a jaw switching element (US Pat. 6 . 26 ) of a dual-clutch transmission ( 1 ) or an automated manual transmission ( 25 ) in countershaft design, according to claim 3 or 4, characterized in that during a gear change, the signals of the sensors ( 10 . 11 . 12 . 32 . 33 ), whereby the phase position between the parts of the switching element required for the new gear is already known during meshing. Method for avoiding a tooth-on-tooth position when closing a jaw switching element (US Pat. 6 . 26 ) of a dual-clutch transmission ( 1 ) or an automated manual transmission ( 25 ) in Vorgelegebauweise, according to claim 3, 4 or 5, characterized in that the course of the axial position of the sliding sleeves of the claw switching elements ( 6 . 26 ) is detected after the triggering of a circuit, wherein deviations from the desired course either by the correction of the actuation of the claw switching elements ( 6 . 26 ) itself or by a controllable brake or an electric machine on one of the involved shafts of the transmission ( 1 . 25 ) Getting corrected. Method for avoiding a tooth-on-tooth position when closing a jaw switching element (US Pat. 6 . 26 ) of a dual-clutch transmission ( 1 ) or an automated manual transmission ( 25 ) in Vorgelegebauweise, according to one of the preceding claims, characterized in that the Einspurverhalten the claws of the claw switching elements ( 6 . 26 ) is improved by the fact that the claw geometry of the axially non-displaceable part ( 34 ) of claw switching elements ( 6 . 26 ) is convex and has a contour that the relative movement of the axially displaceable part ( 35 ) of the claw switching element to the axially non-displaceable part ( 34 ) corresponds to successful Einspuren.

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