DE102018215178A1 - Method and control device for operating a motor vehicle - Google Patents

Abstract

Method for operating a motor vehicle with a drive unit (1), with a four planetary gear sets, five shift elements and at least eight rotatable shafts having transmission (2), and with an output (14), wherein the transmission by selectively closing and opening the switching elements at least eight Provides forward gears and at least one reverse gear, and wherein three switching elements are designed as clutches and two switching elements as brakes. Then, when in the third forward gear, in which a trained as a brake switching element (10) and two formed as clutches switching elements (12, 13) are closed, is entered in the sailing mode, the switching elements designed as a brake (10) is opened so that in Entry-level sail the two switching elements formed as clutches (11, 13) are closed. Then, when a speed at the output (14) is smaller than a first limit, the league is tracked so that opened for the new league of one of the two closed, designed as clutches shift elements (11) and opened in the third forward gear, as a brake trained switching element (9) is closed.

Description

The invention relates to a method for operating a motor vehicle. Furthermore, the invention relates to a control device for carrying out the method.

From the DE 10 2005 002 337 A1 is designed as an automatic or automated transmission gearbox with four planetary gear sets, five switching elements and at least eight rotatable shafts known. By selective closing and opening of the switching elements, at least eight non-positive forward gears and at least one frictional reverse gear can be provided. Three of the five switching elements are designed as clutches and two of the five switching elements as brakes.

From the DE 10 2011 005 320 A1 a method for operating a motor vehicle is known, which comprises a drive unit, a transmission and an output, wherein the transmission is connected between the drive unit and the output. The transmission is an automatic or automated manual transmission. After DE 10 2011 005 320 A1 Depending on at least one operating condition of the motor vehicle, a sailing mode for the motor vehicle is activated or entered into it and subsequently the sailing mode is deactivated or exited therefrom depending on at least one operating condition of the motor vehicle. While the motor vehicle is running with the internal combustion engine coupled to the output, the sailing mode is activated when a driver request torque dependent on an accelerator operation or a driver torque predetermined driving torque is within a defined range for a defined time and if the current acceleration or deceleration continues of the motor vehicle is within a defined range.

From the DE 10 2010 000 857 A1 Another method for operating a motor vehicle is known. Thus, on the one hand details of a shift sequence for a gear layout for entry into a sailing operation and the other details of a shift sequence for a gear engagement to exit from the sailing operation are disclosed.

From the DE10 2015 220 999 A1 It is known that when entering a sailing mode, in the sailing mode of the motor vehicle, the respective closed and opened shift elements of the transmission depending on at least one operating condition of the motor vehicle nachzuführen or change. This serves to ensure that when it is to be stepped out of the sailing mode, as quickly and conveniently as a suitable non-positive gear in the transmission can be inserted. Then, when the respective closed or open switching elements are tracked in sail mode, therefore, takes place during the sailing mode, a change from an actual sail passage to a target sail passage, in each sail a switching element is more open than in a non-positive gear. To exit from the sailing mode, only a further switching element of the transmission has to be closed, starting from the current actual sail passage, in order to engage in a non-positive gear in the transmission.

The tracking of the sail passage is not possible so far over all sailing ranges with sufficient comfort. This is because switching elements designed as brakes are more sensitive, in particular when closing, than switching elements which are designed as clutches, as a result of which relatively long grinding times may be required for a switching element designed as a brake. This is disadvantageous and impairs the comfort in the tracking of leagues in the transmission. On this basis, the invention is based on the object to provide a novel method for operating a motor vehicle and a control device for operating a motor vehicle.

This object is achieved by a method according to claim 1.

According to the invention, when starting from a third non-positive forward gear, in which a switching element designed as a brake and two switching elements formed as clutches are closed, entering the sailing mode, the switching elements designed as a brake, which is closed in the third non-positive forward gear, are opened, so that in the entry-level sail, the two formed as clutches switching elements, which are closed in the third non-positive forward gear, are closed.

Then, when a speed at the output or a transmission output shaft is smaller than a first limit, the sail gear is tracked, namely such that opened for the new sailing gear of the two closed, designed as clutches switching elements and opened in the third non-positive forward gear, as a brake trained switching element is closed.

Then, if so starting from the third non-positive forward gear in the sailing mode is changed, for the purposes of the invention for this purpose a third non-positive forward gear specially adapted entry-level course is inserted, can be changed from the comfort of a sail passage, which can be changed to a second frictional forward gear fits, namely, when the speed at the output or the transmission output shaft reaches or falls below the first limit.

According to the invention, when the speed at the output or the transmission output shaft is smaller than a second limit and is to be sailed in particular to a standstill, the sail again tracked, namely such that for the new sail gear, the second non-positive forward gear and a first non-positive forward gear fits, the still closed, designed as a clutch switching elements open and the still open, designed as a brake switching elements is closed, so then both formed as brakes switching element closed and all switching elements designed as clutches are open. The second limit for the speed at the output or at the transmission output shaft is smaller than the first limit value for the speed at the output or the transmission output shaft. Then, when sailing with the prime mover stopped, a second limit is selected, which is a defined offset greater than zero. Then, when sailing with the drive unit running, a second limit is selected, which is dependent on an idle speed of the drive unit and a translation of the second non-positive forward gear. The tracking of the sails can be done so with high comfort.

According to an advantageous development, when in a higher than the third non-positive forward gear is entered in the sailing mode, and subsequently the speed at the output or at the transmission output shaft is smaller than a third threshold, a third non-positive forward gear suitable, non-positive league gear is inserted is closed, in which closed as a brake and closed in the third non-positive forward gear shift element and one of the two formed as clutches switching elements, which are closed in the third non-positive forward gear is open. Then, when the speed at the output or the transmission output shaft is smaller than a fourth limit, the league track is tracked, namely such that designed as a brake, closed in non-positive third forward gear switching element open and the other designed as a clutch, closed in non-positive third forward gear Switching element is closed, so that in the tracking sail gear those switching elements are closed, which are also closed when starting from the third non-positive forward gear in the sailing mode. Then, when subsequently the speed at the output or the transmission output shaft is smaller than the first limit, the sail passage is further tracked, namely such that opened for the new league gear one of the two closed, designed as clutches switching elements and opened in the third non-positive forward gear, formed as a brake switching element is closed. The third threshold and the fourth threshold are both greater than the first threshold, with the fourth threshold being less than the third threshold for. This development relates to the case in which a higher than the third non-positive forward gear has already entered the sailing mode. Depending on the speed at the output or the transmission output shaft, then, when the respective speed is smaller than the third limit, is changed to that sail passage, which is then inserted when entering from the third non-positive forward gear out in the sailing mode. From this sail passage is then with high comfort a gear tracking in a sail gear possible, which fits the second non-positive forward gear.

According to a further advantageous development, the gear tracking takes place until the first forward gear of the transmission. For this purpose, when the rotational speed at the output or at the transmission output shaft becomes smaller than a fifth limit value, which is smaller in magnitude than the second limit value, a non-positive leap gear suitable for the first non-positive forward gear is engaged. A distinction is made as to whether sailing is currently underway with the drive unit running or stopped. When sailing with the drive unit running, the first shift element (designed as a brake) and the second shift element (designed as a brake) remain closed in the new sail passage. If, however, sailed with stopped drive unit, the previously closed (designed as a brake) second switching element is opened to form the new sail and closed the previously opened (designed as a clutch) third switching element. If now a creep of the motor vehicle desired, the sailing mode is terminated and inserted in the transmission of the first non-positive forward gear. Was previously sailed with the drive unit running, the adhesion is in the transmission by closing the previously opened (designed as a clutch) third switching element. Was previously sailed with the drive unit stopped, the adhesion is in the transmission by closing the previously opened (designed as a brake) second switching element, at the same time or with a time delay, the drive unit is started. Advantageously, the proposed here gearing from the second to the first forward gear with stopped drive unit allows minimization of the effects of gearbox-specific tension in the transmission at the end of the sailing operation, which is reflected in a consistently high shift quality paired with reduced internal gear component wear.

The control device according to the invention is defined in claim 11.

• 1 ein Antriebstrangschema eines Kraftfahrzeugs mit einem Getriebe;
• 2 eine Schaltmatrix des Getriebes der 1 mit kraftschlüssigen Gängen;
• 3 eine Schaltmatrix des Getriebes der 1 mit nicht kraftschlüssigen Segelgängen;
• 4 ein Ablaufdiagramm zur Verdeutlichung der Erfindung;
• 5 ein Zeitdiagramm zur weiteren Verdeutlichung der Erfindung;
• 6 eine zur 3 alternative Schaltmatrix des Getriebes der 1 mit nicht kraftschlüssigen Segelgängen; und
• 7 eine zweite zur 3 alternative Schaltmatrix des Getriebes der 1 mit nicht kraftschlüssigen Segelgängen.

Preferred developments emerge from the subclaims and the following description. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

• 1 a powertrain diagram of a motor vehicle with a transmission;
• 2 a switching matrix of the transmission of 1 with non-positive gears;
• 3 a switching matrix of the transmission of 1 with non-positive sailing courses;
• 4 a flow chart to illustrate the invention;
• 5 a timing diagram for further illustrating the invention;
• 6 one to 3 alternative switching matrix of the transmission 1 with non-positive sailing courses; and
• 7 a second to 3 alternative switching matrix of the transmission 1 with non-positive sail courses.

The invention relates to a method and a control device for operating a motor vehicle and a control device for carrying out the method.

1 shows very schematically a drive train scheme of a motor vehicle with an automatic transmission 2 , The powertrain of 1 includes a drive unit 1 , the automatic transmission 2 and a downforce 14 , where the automatic transmission 2 between the drive unit 1 and the downforce 14 is switched.

The basic structure and the basic mode of operation of the gearbox 2 of the 1 is from the DE 10 2005 002 337 A1 known.

The gear 2 includes a transmission input shaft 7 , a transmission output shaft 8th , four planetary gear sets 3 . 4 . 5 . 6 and five switching elements 9 . 10 . 11 . 12 , and 13 , wherein the two switching elements 9 and 10 also as switching elements A and B be designated, and wherein the switching elements 11 . 12 and 13 also as switching elements C . D and e be designated. At the switching elements A and B as well as the switching elements C . D and e are each frictional switching elements, namely in the switching elements A and B about brakes and the shifting elements C . D and e around couplings.

All four planetary gear sets 3 . 4 . 5 . 6 are designed as simple minus planetary gear sets and arranged coaxially one behind the other. A minus planetary gearset has known planetary gears that mesh with sun and ring gear of this planetary gear set. The ring gears of the four planetary gear sets 3 . 4 . 5 . 6 are with HO3 . HO4 . HO5 and HO6 referred to, the sun gears with SO3 . SO4 . SO5 and SO6 using the planetary gears PL3 . PL4 . PL5 and PL6 , And the webs on which said planet gears are rotatably mounted, with ST3 . ST4 . ST5 and ST6 ,

With the five switching elements A to e is a selective shift of eight forward gears V1 to V8 and at least one reverse gear R1 realizable. The gear 2 has a total of at least eight rotatable shafts 19 . 20 . 21 . 22 . 23 . 24 . 25 . 26 on.

With regard to the coupling of the individual elements of the four planetary gear sets 3 . 4 . 5 . 6 with each other and the transmission input shaft 7 and transmission output shaft 8th is with the gearbox 2 provided the following: The bridge ST4 of the planetary gear set 4 and the transmission input shaft 7 are rotationally connected to each other and form a first wave 19 of the transmission 2 , The jetty ST6 of the planetary gear set 6 and the transmission output shaft 8th are rotatably connected to each other and form a second wave 20 of the transmission 2 , The sun wheel SO3 of the first planetary gear set 3 and the sun wheel SO4 of the planetary gear set 4 are rotationally connected to each other and form a third wave 21 of the transmission 2 , The ring gear HO3 of the planetary gear set 3 forms a fourth wave 22 of the transmission 2 , The ring gear HO5 of the planetary gear set 5 and the sun wheel SO6 of the planetary gear set 6 are rotationally connected with each other and form a fifth wave 23 of the transmission. The jetty ST3 of the planetary gear set 3 and the ring gear HO6 of the planetary gear set 6 are rotationally connected with each other and form a sixth shaft 24 of the transmission 2 , The sun wheel SO5 of the planetary gear set 5 and the ring gear HO4 of the planetary gear set 4 are rotationally connected to each other and form a seventh wave 25 of the transmission 2 , The jetty ST5 of the planetary gear set 5 forms an eighth wave 26 of the transmission 2 ,

With regard to the coupling of the five switching elements 9 to 13 or A to e to the waves so described 19 to 26 of the transmission 2 is with the gearbox 2 according to 1 the following is provided: a first switching element A is in the power flow between the third wave 21 and a transmission housing 27 arranged. A second switching element B is in the power flow between the fourth wave 22 and the transmission housing 27 arranged. A third switching element C is in the Power flow between the fifth shaft 23 and the first wave 19 arranged. A fourth switching element D is in the power flow between the eighth wave 26 and the second wave 20 is arranged. A fifth switching element e is in the power flow between the seventh wave 25 and the fifth wave 23 arranged. The fourth switching elements D can also alternate between the eighth wave in the power flow 26 and the sixth wave 24 be arranged. The fifth switching elements e can also be alternatively in the power flow between the fifth wave 23 and the eighth wave 26 be arranged.

In 2 is a circuit diagram of the transmission 2 according to 1 shown. In every forceful forward gear V1 to V8 three switching elements are closed and two switching elements open. The first forward gear V1 results from closing the brakes A and B and the clutch C , the second forward gear V2 by closing the brakes A and B and the clutch e , the third forward gear V3 by closing the brake B and the couplings C and e , the fourth forward gear V4 by closing the brake B and the couplings D and e , the fifth forward speed V5 by closing the brake B and the couplings C and D , the sixth forward speed V6 by closing the couplings C . D and e , the seventh forward gear V7 by closing the brake A and the couplings C and D , as well as the eighth forward gear V8 by closing the brake A and the couplings D and e , As can be seen from the circuit diagram, the reverse gear R results by closing the brakes A and B and the clutch D ,

The relative position of the four Platenradsätze 3 . 4 . 5 . 6 and the five switching elements A . B . C ,, D . e of in 1 illustrated transmission 2 within the transmission 2 can in principle be arbitrary and is only by the dimensions and the external shape of the gear housing 27 limited. This is from the DE 10 2005 002 337 A1 known.

1 shows that the drive unit 1 to a transmission input shaft 7 and the downforce 14 to a transmission output shaft 8th is coupled. Depending on the gearbox 2 engaged gear converts the transmission 2 Speeds and torques and thus provides the traction power supply of the drive unit 1 at the output 14 ready.

Between the drive unit 1 and the transmission input shaft 7 is in the 1 shown embodiment, a converter 15 connected. Such a converter 15 has a turbine 16 , where the turbine 16 to the transmission input shaft 7 is coupled. It also has a converter 15 via a pump 17 and a lockup clutch 18 , The structure of such a converter is familiar to the person skilled in the art. Instead of a converter can also be a starting clutch between the drive unit 1 and the transmission input shaft 7 be switched.

Like the switching matrix of 2 can be removed is in each zugkraftübertragenden or non-positive gear of the transmission 2 a first defined number of switching elements 9 to 10 closed or switched on and a second defined number of switching elements 9 to 13 opened or switched off. 2 it can be seen that in each non-positive gear three switching elements are closed and two switching elements are open.

It is already known that when in the transmission 2 a force-locking gear is engaged and the motor vehicle travels in this non-positive gear, is entered depending on at least one operating condition of the motor vehicle in a sailing mode, for entering into the sailing mode starting from a non-positive forward gear, a switching element of the transmission 2 , which is closed in non-positive gear, is controlled to open, so that in sailing mode, a single switching element less closed and thus a single switching element is more open than in a non-positive gear, so then the traction in the transmission 2 is interrupted. The shift elements of the transmission 2 , which are closed in sailing mode, form a non-positive sailing course.

Furthermore, it is already known, after the entry into a sailing mode below depending on at least one operating condition of the motor vehicle from the sailing mode again auszuschteigen. For this purpose, starting from the sailing mode, a switching element is closed to engage a non-positive gear.

Furthermore, it is already known that in the sailing mode of the motor vehicle, the respectively closed and opened switching elements of the transmission 2 be tracked or changed depending on at least one operating condition of the motor vehicle. As a result, the non-positive sailing course is tracked in sailing mode. This tracking of the sails allows a spontaneous and comfortable exit from the sailing mode.

As already stated above, in every non-positive gear of the transmission 2 a first number of the switching elements 9 to 13 closed and a second number of switching elements 9 to 13 open. Then, when the sailing mode of the motor vehicle is active, in sailing mode is a single switching element of the transmission 2 more open than in a non-positive gear. The closed in sail mode switching elements define the so-called non-positive sailing gear, can be changed from the starting, by closing a further switching element in a non-positive gear to exit the sailing mode.

While in the switching matrix the 2 in each frictional forward gear V1 to V8 as well as the closed in the positive reverse gear R switching elements are marked with a dot, are in the switching matrix of the 3 and in the alternative switching matrix the 6 for non-positive sailing courses S1 to S8B those switching elements marked with a point that are closed in the respective non-positive sailing course. From the switching matrix of 3 . 6 It follows again that in each non-positive league a single switching element is more open than in a non-positive gear. The switching matrices of 3 and 6 differ only in not relevant to the invention sail S4A.

Then, if in the third non-positive forward gear V3 is driven, in which one as a brake B trained switching element 10 namely, the second switching element 10 , and two as couplings C . e trained switching elements 11 . 13 namely, the third switching element 11 and the fifth switching element 13 , are closed, and starting from the third non-positive forward gear V3 is entered in the sailing mode, this is as a brake B trained, in the third non-positive forward gear V3 closed switching element, so the second switching element 10 , so that in the non-positive entry-level sail S3B the two as clutches C . e trained switching elements 11 . 13 in the third non-positive forward gear V3 are closed, kept closed, so the third switching element 11 and the fifth switching element 13 ,

In 4 visualizes an arrow 28 the entry into the sailing mode from the third non-positive forward gear V3 , In the corresponding entry-level sailing course S3B are the two clutches C and e closed, which also in the third non-positive forward gear V3 are closed. For this purpose, as already stated, starting from the third non-positive forward gear V3 the brake B , So the second switching element 10 , open.

Then, if below a speed at the output 14 or the transmission output shaft 8th less than a first limit G1 is, the sail passage is tracked and thus changed, in which case starting from the sail passage S3B , the third non-positive forward gear V3 fits in the sail passage S2B is changed, the second non-positive forward gear V2 fits.

For this tracking of the sail passage starting from the sail passage S3B in the sails S2B falling below the first limit G1 for the speed at the output 14 or the transmission output shaft 8th , one of the two closed at the sail S3B, designed as clutches switching elements is opened, namely the third switching element C respectively. 11 , wherein in the third non-positive forward gear V3 opened, designed as a brake switching element 9 So the brake A , is closed.

The transition from the sail S3B in the sail S2B takes place with the second switching element open 10 respectively. B , so that inertia effects in the transmission 3 are less than when the first switching element 9 respectively. A when the second switching element is closed 10 respectively. B would be closed.

Then, if below the speed at the output 14 or the transmission output shaft 8th continues to drop and less than a second limit G2 is, the sail course is tracked again and thus changed again, in which case a change from the sail passage S2B in the sails S2A he follows. Sail S2A fits both the second non-positive forward gear V2 as well as the first non-positive forward gear V1 ,

To change from the sail passage S2B in the sails S2A is the still closed, designed as a coupling switching element e , so the fifth switching element 13 , opened and still open, as a brake B trained second switching element 10 closed, so then in again tracked sail passage S2A both as brakes A . B trained switching elements, so the first and the second switching element 9 and 10 , are closed, whereas all as clutches C . D and e trained switching elements, so the third switching element 11 , the fourth switching element 12 and the fifth switching element 13 , all are open.

The transition to the sailing course S2A starting from the sail passage S2B when reaching or falling below the second limit G2 for the speed at the output 14 or for the speed at the transmission output shaft 8th takes place in particular when as the target state of the transmission 2 or the motor vehicle, a stand decoupling of the drive unit 1 in the style of the motor vehicle is aimed, so if in particular to continue to sail until it stops. Even if the target state is an engine stop in the sense of a start-stop system when sailing with a running drive unit 1 is sought, preferably when reaching or falling below the second limit G2 from the sail passage S2B in the sails S2A changed and also the drive unit 1 stopped. The Shutting down the drive unit 1 can also be done before.

If, on the other hand, the target state is a creep, then it is preferable to reach or fall below the second limit value G2 the transition to the sailing course S2A but stopped the sailing mode and in the second non-positive forward gear V2 changed. When sailing with stopped drive unit 1 will then reach or fall below the second limit G2 the drive unit 1 started at the end of sailing mode.

Then, if in a higher than the third non-positive forward gear V3 is entered in the sailing mode and therefore in the transmission 2 a non-positive league gear is engaged, and if subsequently the speed at the output 14 or the transmission output shaft 8th less than a third limit G3 and a third non-positive forward gear V3 will request a suitable sail passage, the non-positive sailing course S3A inserted, in which as a brake B trained and in the third non-positive forward gear V3 closed, second switching element 10 is closed, and in which further one of the two formed as clutches switching element 11 . 13 in the third non-positive forward gear V3 are closed, whereas the other of these two switching elements 11 . 13 closed is.

So shows in particular 4 that in the non-positive sail passage S3A the second switching element 10 which as a brake B is executed, as well as the third switching element 11 which as a clutch C is executed, are closed, whereas the fifth switching element 13 which as a clutch C executed and in the third non-positive forward gear V3 is closed, is open.

Below is the speed at the output 14 or the speed of the transmission output shaft 8th less than a fourth limit G4 , so the sail course is tracked, namely by changing the sail passage S3A in the sails S3B , where the sail passage S3B the one sail is that is also inserted when starting from the third non-positive forward gear V3 entering the sailing mode. In the case of an automatic start-stop system, the fourth limit value can also be reached or fallen below G4 the drive unit 1 be shut down.

For updating the sail passage from the sail passage S3A in the sails S3B is therefore the third non-positive forward gear V3 closed second switching element 10 namely the brake B , open, whereas the fifth, as a clutch e trained switching element 13 is closed.

Below is the speed at the output 14 or the transmission output shaft 8th less than the first limit G1 , As described above in detail, the tracking of the sail passage from the sail passage S3B in the sails S2B , if appropriate below when the second limit value is exceeded G2 a tracking of the sail passage from the sail passage S2B in the sails S2A ,

From the above explanations follows that the second limit G2 for the speed at the output 14 or the transmission output shaft 8th less than the first limit G1 for the speed at the output 14 or the transmission output shaft 8th is.

The third limit G3 and the fourth limit G4 for the speed at the output 14 or the transmission output shaft 8th Both are greater than the first limit G1 , where the fourth limit G4 for the speed output 14 or the transmission output shaft 8th less than the third limit G3 is.

The gear tracking of the leagues with active sail mode described above can both in drive mode stopped in sailing mode 1 as well as in sailing mode running drive unit 1 respectively.

Depending on whether with the drive unit running 1 or stopped drive unit 1 is sailed, becomes the second limit G2 for the change from the sail passage S2B in the sails S2A selected.

Then, when sailing in the sails S2B the drive unit 1 is stopped, becomes a second limit G2 chosen, which is a defined offset greater than zero, so so the transition from the sail passage S2B in the sails S2A and thus closing the second, as a clutch B trained switching element 10 still takes place while rolling the motor vehicle.

Will be in the sailing course S2B with running drive unit 1 sailed, so will be the second limit G2 a limit selected by an idling speed of the drive unit 1 and a translation of the second non-positive forward gear V2 is dependent, in particular such that when sailing with the drive unit running 1 the passage following the course of the sail S2B in the sails S2A then takes place when a differential speed on the brake B formed second switching element 10 Zero. The differential speed on the as a brake B formed second switching element 10 is then zero when the synchronous speed of the second non-positive forward gear V2 of the current speed at the transmission input shaft 7 or the current speed of the drive unit 1 equivalent.

Further details of the gear tracking while sailing with the drive unit running 1 will be referred to below with reference to 5 described, in 5 over the time t several waveforms 29 . 30 . 31 and 32 are shown. The waveform 29 visualizes the course of a speed at the output 14 or the transmission output shaft 8th , The waveform 30 visualizes the synchronous speed of the third non-positive forward gear V3 , the waveform 31 the synchronous speed of the second non-positive forward gear V2 , The waveform 32 shows an engine idle speed of the running drive unit 1 ,

At time t1, the speed becomes 29 at the output 14 less than the first limit G1 so the change from the sail passage S3B in the sails S2B takes place, namely as described above.

At time t2 the 5 , visualized by a circle, the differential speed on the as a brake B formed second switching element 10 Zero, the product of the speed 29 at the output 14 or the transmission output shaft 8th and the translation of the second non-positive forward gear V2 then corresponds to the idle speed 32 of the drive unit 1 , which then the speed of the transmission input shaft 7 certainly. At this time t2 then the tracking of the sail passage from the sail passage S2B in the sails S2A ,

The invention further relates to a control device for carrying out the method, ie for operating a motor vehicle with a drive unit 1 , a gearbox 2 and a downforce 14 , where the gear 2 the four planetary gear sets 3 . 4 . 5 and 6 , the five switching elements 9 . 10 . 11 . 12 and 13 and the at least eight rotatable shafts 19 . 20 . 21 . 22 . 23 . 24 . 25 and 26 which are linked together in the manner described above, the transmission of torque, starting from the transmission input shaft 7 in the direction of the transmission input shaft 8th to provide, namely, providing at least eight non-positive forward gears V1 to V8 and at least one non-positive reverse R. The control unit, which is in particular an electronic transmission control unit, controls the implementation of the method according to the invention, the switching elements of the transmission 2 for the control-side execution of the above-described gear tracking or for entry into the sailing mode.

For this purpose, the control unit has data interfaces in order to exchange data with the modules involved in carrying out the method according to the invention, that is to say the switching elements of the transmission 2 to drive, in response to a provided by a speed sensor speed of the output 14 , which can also be calculated. Furthermore, the control unit has a processor for data processing and a memory for data storage. Program modules implemented in the control unit serve to carry out the method according to the invention.

A second to 3 alternative switching matrix of the transmission 1 with non-frictional sailing gears is in 7 shown. From the switching matrix of 7 It follows again that in each non-positive league a single switching element is more open than in a non-positive gear. The switching matrices of 3 and 7 differ in the transition from the second to the first league.

In the switching matrix of 7 Two options for the formation of the first leap are provided, namely the already out 3 known sailing course S1A and a new sail passage S1C , In the sail passage S1A are that as a brake A trained first switching element 9 as well as the brake B trained second switching element 10 closed. In the sail passage S1C however, they are as a brake A trained first switching element 9 as well as the clutch C trained third switching element 11 closed. It is envisaged that if the speed at the output 14 or at the transmission output shaft 8th becomes smaller than a fifth limit G5 which is smaller in value than the second limit G2 , starting from the currently inserted sail passage S2A a gear track in a first non-positive forward gear V1 appropriate, non-frictional sail passage takes place. The choice in which of the two sailing courses S1A or S1C the gear tracking takes place, is dependent on the current operating state of the drive unit 1 , Is in the presence of said speed criterion with running drive unit 1 sailed, so is starting from the sail passage S2A in the sails S1A changed, with the two as a brake A . B trained switching elements 9 . 10 stay closed. On the other hand, when the aforementioned speed criterion exists, with the drive unit stopped 1 sailed, so is starting from the sail passage S2A in the sails S1C changed by the previously closed, as a brake B trained second switching element 10 opened and the previously opened, as a clutch C trained third switching element 11 is closed.

If subsequently a creeping of the motor vehicle is desired, the sailing mode is terminated and in the transmission the first non-positive forward gear V1 inserted, if then before with running drive unit 1 sailed, that was still open, as a clutch C trained third switching element 11 is closed, whereas, if previously with shutdown drive unit 1 sailed that was still open, as a brake B trained second switching element 10 closed and at the same time or staggered the drive unit 1 is started.

Of course, the in 7 proposed gear tracking depending on the operating state of the drive unit 1 in one of the two for the first non-positive forward gear V1 appropriate, non-positive sailing courses S1A . S1C also with the in 6 combine proposed switching matrix.

LIST OF REFERENCE NUMBERS

1

power unit

2

automatic transmission

3

first planetary gear set

HO3

Ring gear first planetary gear set

PL3

Planetary gear first planetary gear set

ST3

Bridge first planetary gear set

SO3

Sun gear first planetary gear set

4

second planetary gear set

HO4

Ring gear second planetary gear set

PL4

Planetary gear second planetary gear set

ST4

Bridge second planetary gear set

SO4

Sun gear second planetary gear set

5

third planetary gear set

HO5

Ring gear third planetary gear set

PL5

Planet wheel third planetary gear set

ST5

Bridge third planetary gear set

SO5

Sun gear third planetary gear set

6

fourth planetary gear set

HO6

Ring gear fourth planetary gear set

PL6

Planet wheel fourth planetary gear set

ST6

Bridge fourth planetary gear set

SO6

Sun gear fourth planetary gear set

7

Transmission input shaft

8th

Transmission output shaft

9

first switching element

A

brake

10

second switching element

B

brake

11

third switching element

C

clutch

12

fourth switching element

D

clutch

13

fifth switching element

e

clutch

14

output

15

converter

16

turbine

17

pump

18

Converter lockup clutch

19

first wave

20

second wave

21

third wave

22

fourth wave

23

fifth wave

24

sixth wave

25

seventh wave

26

eighth wave

27

gearbox

28

Entry sailing mode

29

Speed output

30

Synchronous speed

31

Synchronous speed

32

Idle speed

G1

first limit

G2

second limit

G3

third limit

G4

fourth limit

G5

fifth limit

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 102005002337 A1 [0002, 0018, 0025]
• DE 102011005320 A1 [0003]
• DE 102010000857 A1 [0004]
• DE 102015220999 A1 [0005]

Claims (12)

Method for operating a motor vehicle with a drive unit (1), with one four planetary gear sets (3, 4, 5, 6), five shift elements (9, 10, 11, 12, 13) and at least eight rotatable shafts (19, 20, 21 , 22, 23, 24, 25, 26) having gear (2), and with an output (14), wherein the transmission (2) is formed as an automatic or automated transmission, between the drive unit (1) and the output (14 ) and provides by selectively closing and opening the switching elements (9, 10, 11, 12, 13) at least eight positive forward gears and at least one frictional reverse gear, and wherein three of the five shift elements as clutches (C, D, E) and two the five switching elements are designed as brakes (A, B), wherein in each inserted, non-positive gear of the transmission (2) a first number of switching elements (9, 10, 11, 12, 13) of the transmission (2) closed and a second Number of switching elements (9, 10, 11, 12, 13) of the transmission (2) is opened, being entered depending on at least one operating condition of the motor vehicle in a sailing mode, starting for entering the sailing mode of the motor vehicle, starting from a non-positive forward gear, a switching element of the transmission (2) is driven to open so that in a non-positive sailing gear a switching element less closed and thus a switching element is more open than in a non-positive gear, wherein in the sailing mode of the motor vehicle each closed and open switching elements of the transmission (2) depending on at least one operating condition of the motor vehicle for tracking the Sails are changed, characterized in that when starting from a third non-positive forward gear (V3), in which a brake (B) formed switching element (10) and two as clutches (C, E) formed switching elements (11, 13) are closed, in the Seg elmodus is opened, which is opened as a brake (B) switching elements (10) is opened, so that in the non-positive entry-level sail (S3B), the two as clutches (C, E) formed switching elements (11, 13) are closed, then that If a speed at the output (14) or at a transmission output shaft (8) is less than a first limit (G1), the sail gear is tracked, namely such that for the new sail gear (S2B) one of the two closed, as clutches (C ) formed switching elements (11) open and in the third non-positive forward gear (V3) open, designed as a brake (A) switching element (9) is closed, and that when the rotational speed at the output (14) or at the transmission output shaft (8) smaller than a second limit value (G2), the sail passage is tracked again, namely such that for the new sail passage (S2A), the still closed, designed as a clutch (E) switching elements (13) open and the still open, designed as a brake (B) switching elements (10) is closed, so then both as brakes (A, B) formed switching element (9, 10) closed and all as clutches (C, D, E) formed switching elements (11 , 12, 13) are opened. Method according to Claim 1 , characterized in that when the speed at the output (14) or at the transmission output shaft (8) is less than a second threshold (G2) and subsequently creep of the motor vehicle is desired, the sailing mode is terminated and this in the transmission a second force-locking forward gear (V2) is inserted, and then, when it is sailed with the drive unit stopped (1), the drive unit (1) is started. Method according to Claim 1 or 2 characterized in that, when entering the sailing mode in a higher than the third non-positive forward gear (V3) and the rotational speed at the output (14) or at the transmission output shaft (8) becomes smaller than a third limit value (G3), a sail gear (S3A) is inserted, in which the brake element (B) formed and in the third non-positive forward gear (V3) closed switching element (10) closed and one of the two as clutches (C) formed switching elements (11) in the third non-positive Forward gear (V3) are closed, is open. Method according to Claim 3 , characterized in that when the speed at the output (14) or at the transmission output shaft (8) is less than a fourth limit (G4), the league is tracked, namely such that the brake (B) formed in the closed third gear (V3) closed switching element (10) open and the other as a clutch (E) formed in the non-positive third forward gear (V3) closed switching element (10) is closed. Method according to one of Claims 1 to 4 , characterized in that the second limit value (G2) for the rotational speed at the output (14) or at the transmission output shaft (8) is smaller than the first limit value (G1) for the rotational speed at the output (14) or the transmission output shaft (8). Method according to one of Claims 1 to 5 , characterized in that when it is sailed with the drive unit stopped (1), a second limit (G2) for the speed at the output (14) or at the transmission output shaft (8) is selected, which is a defined offset greater than zero. Method according to one of Claims 1 to 5 , characterized in that when, with the drive unit running (1) is sailed, a second limit (G2) for the rotational speed at the output (14) or at the transmission output shaft (8) is selected, the idling speed of the drive unit (1) and a translation of the second non-positive forward gear (V2) is dependent. Method according to one of Claims 4 to 7 , characterized in that the third limit value (G3) and the fourth limit value (G4) for the rotational speed at the output (14) or at the transmission output shaft (8) are both greater than the first limit value (G1) for the rotational speed at the output (14). or at the transmission output shaft (8), and that the fourth limit value (G4) for the rotational speed at the output (14) or the transmission output shaft (8) is less than the third limit value (G3) for the rotational speed at the output (14) or at the Transmission output shaft (8). Method according to one of Claims 1 to 8th , characterized in that when, with the drive unit running (1) is sailed and the speed at the output (14) or at the transmission output shaft (8) is smaller than a fifth threshold (G5) is less than the second threshold (G2), the sail passage is tracked so that for the new league (S1A) the two brake (A, B) formed switching elements (9, 10) remain closed, whereas when it is stopped with the drive unit (1) and the speed at the output (14 ) or at the transmission output shaft (8) is smaller than the fifth limit (G5), the sail passage is tracked so that the previously closed, designed as a brake (B) second switching element (10) opened for the new sail passage (S1C) and the previously opened, designed as a clutch (C) third switching element (11) is closed. Method according to Claim 9 , characterized in that when subsequently a creeping of the motor vehicle is desired, the sailing mode is terminated and in the transmission a first positive forward gear (V1) is inserted by then, when sailing with the drive unit running (1), the still open, third switching element (11) formed as a clutch (C) is closed, whereas when the drive unit (1) is stopped, the drive unit (1) is started and the second switching element (10) still open, designed as a brake (B) is closed. Control device for operating a motor vehicle with a drive unit (1), with a four planetary gear sets (3, 4, 5, 6), five switching elements (9, 10, 11, 12, 13) and at least eight rotatable shafts (19, 20, 21 , 22, 23, 24, 25, 26) having gear (2), and with an output (14), wherein the transmission (2) is formed as an automatic or automated transmission, between the drive unit (1) and the output (14 ) and provides by selectively closing and opening the switching elements (9, 10, 11, 12, 13) at least eight positive forward gears and at least one frictional reverse gear, and wherein three of the five shift elements as clutches (C, D, E) and two the five switching elements are designed as brakes (A, B), wherein the control unit in each inserted, non-positive gear of the transmission (2) a first number of switching elements of the transmission (2) for closing and a second number of switching elements of the Getri ebes (2) controls to open, the control unit depending on at least one operating condition of the motor vehicle, the transmission (2) for transferring the same in a sailing mode, the control unit for entering the sailing mode starting from a non-positive forward gear a switching element of the transmission (2) Open activates, so that in a non-positive leaking a switching element less closed and thus a switching element is more open than in a non-positive gear, the control unit in sailing mode of the motor vehicle each closed and open switching elements of the transmission (2) depending on at least one operating condition of the motor vehicle for the tracking of the sail gear changes, characterized in that when starting from a third non-positive forward gear (V3) in which a brake (B) formed switching element (10) and two as clutches (C, E) formed switching elements (12, 13) ge are closed, is entered in the sailing mode and the control unit as the brake (B) trained switching elements (10) controls to open, so in the non-positive entry-level gear (S3B), the two as clutches (C, E) formed switching elements (11, 13) are closed, wherein the control unit, if a speed at the output (14) or at a transmission output shaft (8) is smaller than a first limit value (G1), tracks the league, namely such that the control unit for the new league gear ( S2B) one of the two closed, as clutches (C) formed switching elements (11) for opening and in the third non-positive forward gear (V3) open, designed as a brake (A) switching element (9) drives to close, and wherein the control unit then, when the speed at the output (14) or at the transmission output shaft (8) is smaller than a second limit value (G2), the leaflet tracked again, namely such that the Steuerger t for the new sailing gear (S2A) the still closed, designed as a clutch (E) switching elements (13) for opening and the still open, designed as a brake (B) switching elements (10) for closing drives, so then both as brakes (A, B) formed switching element (9, 10) are closed and all coupling elements (C, D, E) formed switching elements (11, 12, 13) are opened. Control unit after Claim 11 , characterized in that the same the method according to one of Claims 1 to 10 on the control side.

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