DE102005034525A1 - Motor vehicle gear device controlling method, involves engaging power train, and selecting and engaging preset target gear in one subgear, where power train is continued to be engaged during engagement of target gear - Google Patents

Abstract

The method involves engaging a power train by releasing two torque transmission devices, and selecting and engaging a preset target gear (14) in a subgear. The target gear is selected and engaged in another side of the subgear. The power train is continued to be engaged during the engagement of the gear. The transmission devices provided on a gear input shaft of the subgear is locked. An independent claim is included for a gear control unit for a motor vehicle device.

Description

The Invention relates to a method for operating a motor vehicle, and in particular for controlling one, preferably as a dual-clutch transmission designed, transmission device of a motor vehicle, and a in particular designed as a double-clutch transmission, motor vehicle transmission device.

Known are already automated transmissions for motor vehicles. For controlling of gear changes is an electronic in such automated transmissions control unit or given an electronic control. In general, this is electronic control unit or this electronic control with one or more actuators in signal connection. Such actuators are usually each an electric motor. Furthermore, the actuators can be hydraulic or pneumatic switching cylinder, by means of a corresponding Switching valves from a pressure supply unit with pressure be charged. The electronic control unit or the electronic control then controls these actuators, for example, the electric motors or the voltage supply of such electric motors or valves and their pressure supply devices with corresponding control signals be charged. By means of these actuators then gears can be inserted and designed become. It is also known that there are also couplings, such as start-up clutches or the like, in particular by means of electrical, hydraulic or hydrostatic actuators can be controlled electronically, and in particular also in the context of the installation and design of aisles and / or to interrupt or close the drive train of Motor vehicle or sections or branches of the drive train.

Known is further that in motor vehicle transmission devices, and in particular in automated transmissions, formed exactly one drivetrain branch can be, such as in an automated transmission (ASG), or several, in particular two, parallel drivetrain branches, such as in a dual-clutch transmission (DKG) or Parallel gearbox (PSG) or under load switchable automated gearbox (Uninterruptible gearbox, USG) or in an automated, from an electric machine support manual transmission (ESG).

Of the Applicant is - at least internal - continue known to improve ride comfort in automated Driven depending on the application in some or all gears of Drive train is opened by the clutch or by the couplings, as soon as the driver pulls the train, for example by reducing the accelerator pedal position or on a downhill descent, leaves to to prevent the engine or the internal combustion engine by the movement of the vehicle is driven. As a result, the falls Engine speed down while the input shaft speed of adjusting when the vehicle is rolling Speed follows. This functionality is called freewheeling function (English free wheels or neutral idle) referred.

In the current - at least Applicant's internally known applications will be the gear selection During the freewheeling function is not changed; So there is always a target gear engaged, the input shaft speed well above idle speed (typical for a diesel engine 2000 +/- 500 rpm) guaranteed. If the freewheel function is to be left in the direction of train operation, because the driver increases the load lever position, so can only be engaged be when the engine speed over the input shaft speed has increased; otherwise, despite Acceleration request of the driver first for a short time in the thrust mode changed, so the vehicle is delayed for a short time.

To the engine speed over the input shaft speed has risen, is in the described Proceed no moment transfer So the vehicle does not accelerate. Especially with turbo diesel engines, Their speed due to the special engine characteristics ("turbo-hole") even when the drive train is only relatively sluggish this increase the accelerator pedal position responds, the delay between acceleration request in fact Onset of acceleration felt annoying. The vehicle This makes it very sluggish. In - at least the applicant internally known - known transmission software for parallel gearbox When an acceleration request during freewheeling both clutches are initially (almost) kept open until the engine speed over the speed of the transmission input shaft with has risen to the inserted target gear. After that, for comfort reasons, the belonging to the target gear Clutch slowly closed and at the same time a negative engine torque intervention made, for larger engine speed overshoots to avoid. The full engine torque requested by the driver is available so only significantly (typically about 1.5 s) after increasing the Pedal value for the acceleration of the vehicle available.

The invention has for its object to provide a design or a method, which is made possible that motor vehicles can be accelerated quickly and conveniently, if corresponding, for example, by the driver by pressing an accelerator pedal displayed, acceleration request with the drive train is open.

short presentation the invention

In particular, according to the invention a method according to claim 1 or according to claim 21 proposed. An inventive control device is the subject of claim 19. A motor vehicle according to the invention is the subject of claim 20.

According to one inventive idea is a method for operating a motor vehicle or to Control proposed a transmission device of a motor vehicle, as a multi-clutch transmission or as a dual-clutch transmission is designed.

One Such dual-clutch transmission (DCT) is designed in particular so that it has a first partial transmission, and a second partial transmission, wherein the first partial transmission has a first transmission input shaft and wherein the second partial transmission, a second transmission input shaft having. At this first transmission input shaft of the first sub-transmission In this case, a first torque transmission device is provided in particular. This first torque transmitting device is in particular the motor side of this first transmission input shaft intended. The first partial transmission further comprises a plurality of wheelsets, in particular Gear sets, for the formation of adjustable and interpretable gears. It can be provided be that these passages, or one wheel each of these wheelsets, is arranged on the first motor input shaft.

It is provided in particular that the second partial transmission a second Has transmission input shaft, and one at this second transmission input shaft arranged second torque transmission device. This second torque transmitting device is in particular arranged on the motor side. The second partial transmission also has several wheelsets, in particular gear sets, for Formation of tunable and layable tunnels. Again, can be provided be that these passages or in each case a gear of the corresponding wheelsets on the second transmission input shaft are arranged.

The first torque transmitting device or the second torque transmission device is in each case in particular designed so that it is opened and can be closed. This first torque transfer device or this second torque transmitting device In particular, a clutch, preferably friction clutch, be or have such. You can in each case in particular so be designed so that it can be switched to a state in which they are complete open is, as well as in a state in which it is so closed, that they each have a current torque applied to it in the substantially completely transferred can. It is preferably provided that this torque transmission device or clutch can also be closed or opened so that they a partly present or applied limited to their current torque can. It is particularly provided that the clutch slips. Further preferred and exemplary designs of such Dual clutch transmissions are also elsewhere in this disclosure described.

It be noted in this context, however, that instead of a such dual-clutch transmission and a multiple clutch transmission used may be more than two clutches or more than two parallel having switched driveline branches. In current applications In the automotive sector, such multiple clutch transmissions with more than two clutches - so far the applicant known - yet not used, it being noted that the invention related with such designs is also preferred.

According to the addressed Thought of the invention is now provided that the drive train by opening the first and the second torque transmitting device is opened. However, it can also be provided that the process only is started or initiated when the drive train already open is or the first and the second torque transmitting device are open. In this context, it should be noted that in such designs, as a multiple-clutch transmission with more than three parallel connected powertrains are trained, each about also have a clutch, all of these Clutches open are.

The drive train is open in particular via this first and second clutch when no torque can be transmitted via the first clutch and the second clutch, that is to say that the transmittable torque "0" Nm corresponds. However, it can also be provided that in this respect a certain tolerance is allowed, so that the drive train or the corresponding clutch is considered to be open even if this corresponding clutch can transmit a very low torque. This very low, transmittable torque can depend in particular on the design of the engine or the internal combustion engine, which the drive strand with the transmission device drives. It can be provided in particular that the drive train or the corresponding clutch is then considered to be open when the transmittable torque of the respective clutch or clutches is lower than the drag torque of the engine. In particular, in designs in which further consumers, such as air conditioning or the like, can be driven by the engine or the engine on the motor side of the relevant clutch, it can also be provided that the drive train or the first or the second clutch is then opened applies if the transferable from the corresponding clutch or clutches torque is smaller than the sum of the momentum from the engine drag torque and the current acting on this drive train load moments of such consumers, such as air conditioning or the like.

It For example, it can also be provided that the addressed "tolerance" is such that the drive train or the corresponding torque transmission device then as open considered to be transferable by the coupling concerned Torque less than 50 Nm, preferably less than 40 Nm, more preferably less than 30 Nm, more preferably less than 20 Nm, especially preferably less than 10 Nm.

In preferred design is provided that this addressed opening - especially if it is part of the process of the invention is - of Drive train by opening the first and the second torque transmitting device at moved motor vehicle. But it can also be provided that it is done when the vehicle is stationary.

It can also be provided that this opening the drive train by opening the first and the second torque transmitting device outside of gear changes takes place or is not part of gear changes. In this context, however, it should be noted that preferably is anyway provided that in such a dual-clutch gear change operations traction interruption-free, so that as a rule not both torque transmission devices at the same time anyway open are. It is in particular - in particularly preferred embodiment - provided, that opening of the drive train by opening the first and the second torque transmission device for Prevention or reduction of Shear operating phases occur when it is determined that - conditional by a reduction in the value of the accelerator pedal - a train operation (of the motor vehicle) is left in the direction of a push operation.

in this connection For example, it may be provided that the first and the second Torque transfer device then open will, if already - in particular initially - in the Push mode was changed. But it can also be provided that For example, based on the speed or the torque ratios It is determined whether such a push operation is imminent, and the first and second torque transmitting devices are opened, before this pushing operation actually given is. It is particularly preferred, however, that if a decrease in the accelerator pedal value is detected, immediately the first and the second torque transmitting device is opened.

As is known the positions of an accelerator pedal usually associated with accelerator pedal values, the For example, it is such that the accelerator pedal value is assigned to "0" when the accelerator pedal is not under load, and when it is fully depressed Accelerator pedal is assigned the value "1", whereby in the intermediate positions the values increase from "0" to "1".

It It should be noted, however, that the method according to this aspect of the invention in preferred embodiments, regardless of an accelerator pedal or independently of accelerator pedal values can be used. Nowadays, motor vehicles usually have an accelerator pedal or a load lever. It can also be provided be that the inventive method according to this Thoughts are also used on vehicles that are independent of Such an accelerator pedal can be accelerated. Next can be provided be that the procedure according to this Thoughts of the invention is used in designs that, although have an accelerator pedal, where in addition but - for example through an electronic control - the engine can be accelerated or this acceleration be withdrawn can. This is conceivable, for example, in such motor vehicles, where a signal communication between different vehicles or motor vehicle external objects, such as crash barriers or the like, takes place. For example be implemented in such a motor vehicle control functionality, the one kind of distance control to a preceding vehicle represents, and in the internal combustion engine also in the way it can be intervened that there is a withdrawal of the accelerator pedal or Accelerator pedal value, if it is determined that a distance to a vehicle ahead based on certain criteria is too low.

According to the inventive method According to the mentioned idea, it is provided that a signal is monitored, which indicates whether an acceleration request is given.

This may be, for example, a signal which depends on the position or position change an accelerator pedal is generated. As already indicated above, can this, however, also be a signal that is independent of Such an accelerator pedal can be generated. In a design with accelerator pedal, the acceleration request, for example, from the position change depend on this accelerator pedal. This may in particular be such that an increase in the accelerator pedal value or a "further passage" of the accelerator pedal one Acceleration request corresponds to or causes a corresponding Signal is displayed. It can be provided that after a such "continue Passing through "the Accelerators the acceleration request considered as given for so long is, as long as the appropriate torque, speed or gear ratios of the motor vehicle not yet indicated by the acceleration request Situation are adjusted.

According to the inventive method is further provided in particular that a predetermined target gear is selected and inserted at one of the two sub-transmission and that in the other partial transmission, a predetermined gear selected and is inserted. This selected in the other partial transmission and inlaid gear is an intermediate target gear or is called an intermediate target gear. In this selection and Insertion of the target gear or the intermediate target gear is the drive train or the first and the second clutch still open.

It For example, it may be provided that initially the intermediate target gear selected and / or is inserted and then the target gear is engaged or selected or that first the target gear selected or is inserted, and then the intermediate target gear. It is especially provided that the intermediate target gear is selected that it is higher is the target gear or the target gear is selected to be lower as the intermediate target gear, so that the speed of the transmission input shaft of the sub-transmission in which the current target gear is engaged is greater than the speed of the transmission input shaft of the partial transmission is, in where the current intermediate target gear is engaged. For example it is provided that the target gear is selected in each case that driving or starting after re-engagement in the middle speed range allows becomes.

Of the Target gear can in particular - too in addition - be chosen that he depends on the current speed of the motor vehicle is selected. The intermediate target gear can for example be chosen like this be that the speed of the transmission input shaft of the partial transmission, in which this intermediate target gear is selected, after the input this intermediate target gear less than or equal to the speed of the Wave is or would be, in the torque transfer device engages the motor side, which is connected to the transmission input shaft of this sub-transmission with this particular chosen or to be inserted intermediate target gear is arranged. Especially preferred is doing that for the case that there are several gears in the relevant partial transmission, that meet the above condition, the smallest of these gears as Intermediate target gear selected becomes.

The Shaft, the motor side in the first torque transmission device of the first partial transmission engages, preferably corresponds to the shaft, the motor side in the second torque transmission device of the second gear engages, or is integrally connected thereto. It may be provided that said shaft is the motor output shaft is or one with the motor output shaft firmly connected or translated 1: 1 Wave. But it can also be provided that between the engine output shaft and the mentioned, motor side in the first and second torque transmission engaging shaft provided one or more translation stages are.

In In a preferred embodiment, it is provided that the intermediate target gear so chosen that the speed of the transmission input shaft of the partial transmission, in who chose this intermediate target gear is, with inserted intermediate target gear less than or equal to Speed of the shaft is the motor side in the torque transmission device of the Transmission input shaft engages with the intermediate target gear, if in this sub-transmission there exists a gear which fulfills this condition, and that in the case that such a gait fulfilling this condition is not is given, the highest Gear is selected and engaged in this partial transmission as an intermediate target gear.

In a preferred embodiment, it is provided that, after inserting an intermediate target gear and a target gear, this target gear is designed and another target gear is engaged, the drive train still being open. It can therefore be provided in particular that the target gear or target gears are adapted to operating conditions of the motor vehicle. It is further preferred that, after inserting an intermediate target gear and a target gear, the intermediate target gear is laid out and another intermediate target gear is engaged, whereby in this case as well the drive train is still open. It is thus provided in particular that in the phase in which the drive strand or the first and the second torque transmission device are still open, the target gear and the intermediate target gear are each adapted to operating conditions of the motor vehicle. This can for example be such that the adaptation always takes place in such a way that the target gear is adapted as a function of the current vehicle speed or is adjusted in such a way that it is possible to start or continue driving in the medium speed range (in particular when the target gear is engaged).

In a particularly preferred design is provided that the Inter-target gear - at least the first inserted intermediate-target gear - from The course is the last one before the opening of the Drive train or the two torque transmission devices in the sub-transmission was engaged, over which last transmitted from the engine torque input has been. It is particularly preferred that the target gear or the first Inlaid target gear corresponds to the gear, the last before opening the Powertrain was inserted in the aforementioned manner.

According to the inventive method according to the mentioned Thought is provided in particular that the engine of the motor vehicle, which is designed in particular as an internal combustion engine accelerates if it is determined that an acceleration request is displayed becomes. It can be provided in particular that the acceleration the engine started immediately or promptly after detecting the acceleration request becomes.

It can be provided in particular that, if an acceleration request is determined and the insertion of the intermediate target gear and / or Targeting is still ongoing, accelerating the engine already started, in particular immediately or in a timely manner after recognizing the desired acceleration.

Further is then when it is determined that an acceleration request is displayed, that torque transmission device, the the transmission input shaft of the partial transmission is arranged, in which the intermediate target gear is engaged, closed when detected is that an acceleration request is displayed. This closing this Torque transfer device takes place, however, only so far that this torque transmission device slips or that the speed of the motor side in this torque transmission device engaging shaft, especially motor output shaft, faster increases as the speed of the transmission input shaft of the partial transmission with the interim target gear. This closing of this torque transmission device, at the transmission input shaft of the partial transmission with the target gear is arranged, takes place in particular only when the intermediate target gear is inserted. It may be provided in particular that in in the event that an acceleration request is detected, the appropriate intermediate target gear, however, not yet inserted is, the closing the torque transmission device, which is arranged on the transmission input shaft with the intermediate target gear is not, or not always immediately, but that waited until this intermediate target gear is engaged. Furthermore, it is provided in particular in that the torque transmission device, which is arranged on the transmission input shaft with the target gear, first open remains.

In preferred design is - in particular there - the Torque transfer device, the at the transmission input shaft with the current intermediate target gear is arranged, then closed or closed so that this torque transmission slips when the engine side in this torque transmission device engaging shaft or the motor output shaft has a speed, which is bigger as the speed of this transmission input shaft, so in particular a train operation is given.

In a particularly preferred design is provided that after the closing the at the transmission input shaft of the partial transmission with the intermediate target gear provided torque transmission device arranged the speed of the input side of this torque transmission device and in the torque transmitting device engaging shaft, in particular motor output shaft, increases, and in particular, the fact that the engine as a result of the acceleration request is accelerated. It is particularly preferred that then, when the speed of the motor output shaft is greater than the speed of the transmission input shaft the other sub-transmission, so the transmission input shaft of the sub-transmission with the current target gear, which is the partial transmission with the current Between-target gear assigned torque transmission device open and the torque transmission device, the at the transmission input shaft of the partial transmission with the current Target gear is arranged, is closed. This opening and Shut down takes place in particular simultaneously. The opening and closing can for example, in the manner of an overlap circuit take place, as for example for gear changes in dual-clutch transmissions is known. It is in particular of the intermediate target gear Traction interruption free in the target gear changed.

It should be noted that in principle it can also be provided that the input side of the a torque transmission device engages a different shaft than the input side of the other torque transmission device. If this is provided, however, provision is made in particular for the two shafts, which are arranged on the input side of these two torque transmission devices, to be coupled in such a way that they are simultaneously rotated, for which purpose, for example, a transmission stage can be provided. In such a case, it is provided in particular that the above-mentioned change from the intermediate target gear in the target gear with a traction interruption-free circuit is triggered when the speed of the input side engaging in the torque transmission device of the sub-transmission with the target gear shaft is greater than the rotational speed of the transmission input shaft this subtransmission. However, it can also be provided that the motor output shaft is the shaft which engages in the torque transmission device of the first partial transmission, and the shaft which engages in the torque transmission device of the second partial transmission on the motor side.

It It should be noted that in particular it is provided that the torque transmission device, the at the transmission input shaft of the partial transmission with the intermediate target gear is arranged, between the mentioned, as a result of an acceleration request caused closure this torque transmission device and later in time opening this torque transmission device to switch to the target gear is always closed only so far, that they do not completely transmit the torque introduced at the motor side can, so in particular slips.

Especially it is preferably provided that when changed to the target gear is, the torque transmission device, at the transmission input shaft of the partial transmission with the current Target gear is arranged, as far as it is concluded that the engine side in this torque transmission device introduced torque is transmitted substantially completely, or that the Speed of the input side and output side of this torque transmission device engaging wave is identical.

Prefers is provided that after generation or detection of an acceleration signal of the Engine is accelerated at least until the target gear is engaged is.

According to one Another idea is a method of controlling a powertrain system proposed a motor vehicle. This shows the powertrain system a powertrain, an engine, such as internal combustion engine, for driving this drive train as well as a transmission device. The transmission device has several wheelsets for the formation of adjustable and interpretable gears. Furthermore, the Transmission device on at least one torque transmission device, which may be designed, for example, in the manner already mentioned above can. It is particularly preferred that this transmission device is designed as a double clutch transmission. Exemplary designs such a dual-clutch transmission, which is particularly preferred are already mentioned and will be discussed below addressed. Furthermore, it is provided in particular that the drive train system has a drive axle, which on the motor side facing away the drive train is arranged and by means of the engine over the Powertrain is drivable. It is also envisaged that the Powertrain system has an electronic control device and a device, such as accelerator pedal, by means of which an acceleration request can be displayed. The device by means of which an acceleration request can be displayed, but can also be designed in other ways be, for example, as already exemplified above was explained.

According to this further thoughts according to the invention is provided that the drive train by means of or via the torque transmitting devices open What, for example, to prevent or reduce thrust operation phases can be done if it is determined that the vehicle is the train operation in the direction of the pushing operation leaves. This can be, for example be indicated by a reduction of the accelerator pedal value, or by determining that such an accelerator pedal value is reduced, triggered become. There have already been various other exemplary preferred ones above Designs described in the context of this opening, too here in the method according to this Thoughts can be given. In particular, it can also be provided that the method only when open Powertrain is started.

According to the method according to this idea, it is provided in particular that the electronic control device, such as electronic control unit, and for example electronic engine control unit, after opening the at least one torque transmission device or the two torque transmission devices or the drive train and / or if - especially renewed and in particular is displayed by increasing the accelerator pedal value or conditional - acceleration request, generates at least one signal, thereby causing the speed of a located on the engine side of this open torque transmitting device located and in particular in this torque device engaging shaft, such as engine output shaft, is held in the vicinity of or greater than the speed of a lying on the motor side facing away from the same open torque transmitting device transmission input shaft, wherein further is ensured by means of the electronic control device that the transmission input shaft coupled via an engaged gear with this drive axle is. In transmissions with parallel drivetrain branches, these speed ratios preferably relate to one of the transmission input shaft of the partial transmission.

It It should be noted that any combination of the claimed by the dependent claims objects are preferred, and by or described in the description further developments or features shown in the figures could be. Furthermore, can also the inventive method be combined. A motor vehicle according to the invention can also provided with a control device according to the invention be.

Short description the figures

1 an exemplary inventive motor vehicle with an exemplary control device according to the invention in a schematic representation, with reference to this illustration, an exemplary inventive method is explained; and

2 an enlarged section 1 in the area of the dual-clutch transmission.

description further preferred embodiments

1 shows an exemplary motor vehicle according to the invention 1 with an exemplary control device according to the invention 2 ,

This in 1 shown motor vehicle 1 has a designed as an internal combustion engine engine 10 , in particular turbo diesel engine ,. on top of a powertrain 12 can drive. In the drive train 12 is a transmission device 14 arranged, which is a first partial transmission 16 has, and a second partial transmission 18 ,

The first partial transmission 16 and the second partial transmission 18 are arranged or switched parallel to each other. The transmission device 14 is designed as a dual-clutch transmission. Dual-clutch transmissions have two transmission input shafts, each with a clutch to the engine, on which the gears are alternately arranged in size. Adjacent passages can thus be inserted at the same time, so that a change between them takes place solely by opening one and closing the other coupling. It is also possible that the gears are arranged so that they are not arranged alternately on these transmission input shafts. In the embodiment, however, the gears are arranged alternately on the transmission input shafts.

These are gears 20a . 20b on the first transmission input shaft 22 of the first partial transmission 16 - In particular rotationally fixed - arranged. Each of these gears 20a . 20b is part of a separate wheelset 24a . 24b , which is each intended to form a corridor.

In a corresponding manner are on or at the second transmission input shaft 26 of the second partial transmission 18 gears 28a . 28b . 28c - In particular rotationally fixed - arranged - each part of a wheelset 30a respectively. 30b respectively. 30c are.

The wheelsets 24a . 24b . 30a . 30b . 30c are intended for the formation of corridors.

Each of the wheelsets 24a . 24b . 30a . 30b . 30c also has a gear 32a respectively. 32b respectively. 34a respectively. 34b respectively. 34c on, with these gears on a shaft 36 and rotatable relative to this shaft 36 are. The wave 36 is on the engine 10 opposite side of the transmission input shafts 22 . 26 arranged.

The wave 36 is - for example via gear stages - or a differential or other intermediate components with at least one drive axle 38 coupled the motor vehicle. The gears 32a . 32b . 34a . 34b . 34c are, as mentioned, on the wave 36 each rotatably arranged and can via sliding sleeves or gear clutches 40 each connected to the shaft. The speed clutches 40 For example, may be or have sliding sleeves or the like.

To operate the gear clutches 40 is a gear actuator 42 intended. This gear actuator 42 has two electric motors 44 . 46 on, wherein one of these electric motors, a movement for the selection and the other of these electric motors can generate a movement for the switching. The electric motors 44 . 46 be from the electronic control unit 2 driven.

The dual-clutch transmission 14 has two torque transmitting devices 48 . 50 on, which are each designed here as clutches, in particular as friction clutches. These torque transmitting devices can be opened and closed and in one Condition in which they transmit an applied torque partially. The first torque transmitting device 48 is towards the engine or motor side to the first transmission input shaft 22 arranged, and the second torque transmitting device 50 is motor side or to the engine 10 towards the second transmission input shaft 26 arranged.

Motor side engages in these two clutches 48 . 50 respectively the motor output shaft 52 of the motor 10 one. To control the first clutch 48 is a first clutch actuator 54 provided a third electric motor 56 having. In a corresponding manner is for actuating the second clutch 50 a second clutch actuator 58 provided, a fourth electric motor 60 having. The gear actuators and the clutch actuators or their respective electric motors are provided by the transmission control unit 2 driven.

There is also an accelerator pedal 62 provided by the driver of the motor vehicle 1 can be operated. The accelerator pedal 62 can be moved to different positions, which each accelerator pedal values are assigned. Increasing the accelerator pedal value can indicate that an acceleration request is given. This is in particular such that when the accelerator pedal is not loaded by the driver, the accelerator pedal value is "0" and the pedal value "1" is given when the accelerator pedal is fully depressed, the accelerator pedal value correspondingly increasing in the intermediate positions.

It can be provided as through the line 64 indicated that the accelerator pedal value the electronic control unit 2 is displayed, in particular as or by means of an electronic signal. It can be provided that the internal combustion engine 10 from the electronic control unit 2 is controlled.

In the following, an exemplary method according to an idea of the invention will now be explained with reference to the figures:
There is a functionality that opens the powertrain in some or all gears by opening the first clutch and the second clutch as soon as the vehicle leaves the train operation, for example, by reducing the accelerator pedal position or when driving downhill, thereby switching to overrun is prevented, the motor is therefore not driven by the movement of the vehicle. As a result, then falls the engine speed, for example, down to the idle speed, while the input shaft speed is adjusted to the value determined by the engaged gear and, if necessary, the driver influenced by the brake pedal vehicle speed value. In particular, this functionality is also referred to as free-running function.

According to the method is now during the freewheeling function based on or depending on the current vehicle speed despite the open powertrain 12 A target gear has always been selected and engaged in which it would be possible to drive in the middle speed range when the powertrain is closed. The transmission input shaft of the two transmission input shafts, on which this gear is located, is referred to below as transmission input shaft A. It should be noted in this context that both transmission input shafts - alternatively - the transmission input shaft A can form, but not at the same time.

On the other of the two transmission input shafts, each of the Transmission input shaft A is different, and as a transmission input shaft B is called, now a higher gear is engaged, ie a gear of the higher is as the target gear. This gait is also called an intermediate target gait. this leads to cause the transmission input shaft B to turn slower than the transmission input shaft A, on which the target gear is arranged is.

at a sudden Acceleration request of the driver can thus already at low engine speed on this higher Gang or the intermediate target gear traction be transmitted. The delay between the increase the accelerator pedal value and the onset of the train resulting that the engine before closing a clutch only over the speed of the clutch input to the transmission input shaft has to accelerate, is correspondingly smaller.

The Choice of the gear on the transmission input shaft B is preferred so that the speed of this shaft is less than or equal to the current one Engine speed is. If this is not possible, the biggest gear will be placed on this transmission input shaft B. If there are several Gears up the transmission input shaft B is that a shaft speed smaller than allow current engine speed, then the smallest of these gears (as Inter-target gear) to the difference between the engine speed and the shaft speed of the transmission input shaft B, so that the Energy input of the clutch when coupling to keep as low as possible.

If the driver requests an acceleration during the coasting function by increasing the accelerator pedal value, initially both clutches remain 48 . 50 open until the engine 10 a slightly higher speed than the slower of the two transmission input shafts 22 . 26 , So the respective transmission input shaft B has reached. As soon as the motor input shaft 52 has reached a speed the at least the speed of the slower of the two transmission input shafts 22 . 26 , So transmission input shaft B, corresponds to or greater than this speed, the clutch on the shaft B is closed so far that it transmits a calibratable portion of the delivered engine torque. Depending on the driving situation, this can already be the moment when the accelerator pedal is raised. From this point on, ie when the clutch is closed accordingly, the driver already feels an acceleration.

There the clutch on the transmission input shaft B only a part of engine torque is increasing the engine speed continues. As soon as it is greater than the speed of the Transmission input shaft A, placed on the actual target gear is, according to an overlapping circuit, such as for example, such a crossover circuit, that is known from parallel transmissions (PSG overlap circuit), simultaneously the clutch on the shaft B is opened and the shaft A is closed. After this overlap is the full engine torque over the target gear, or over the Partial gear with the target gear, transmitted. The entire engine torque stands for an acceleration of the vehicle thereby available. This full or entire Engine torque is especially what is currently for the drive of the motor vehicle is determined or retrievable, if the engine torque also for other consumers or aggregates, such as air conditioning, provided.

This Procedure allows a much more uniform and much sooner beginning construction of the vehicle acceleration at acceleration requirements while the freewheel as the previously used functionality that the Applicant is known at least internally. There - so in the known design - is no Acceleration noticeable, as long as the engine speed, the speed of the transmission input shaft with the target gear has not yet reached. To larger overshoots of engine speed to avoid when engaging, there - also in the known design - also from reaching this target speed, a negative engine torque intervention be made or very quickly - and thus uncomfortable - engaged become. The acceleration is either significantly slower than theoretically possible or extremely uncomfortable.

The proposed design or the proposed strategy however, a fast acceleration response that is also comfortable is generated, no significant engine speed overshoot and that required by the driver engine torque does not have to cut.

In preferred design is the transmission as a parallel shift transmission (PSG) designed. It can also be provided that the transmission device as automated manual transmission with a driveline assigned Electric machine (ESG) is designed. Also, a design of the transmission device as so-called uninterruptible gearbox (USG) in the sense an automated transmission in which during a switching operation the interrupted between transmission and drive unit torque transmission at least a partial moment over a so-called power shift clutch is transmitted is preferred. The inventive method especially in a vehicle with such a transmission be implemented.

In the following, exemplary designs for a method according to the invention of a further idea will now be explained which, for example, also apply to an in 1 shown motor vehicle can be used. To achieve a quick response to acceleration requirements with the freewheeling function active, the engine speed must be maintained near or above the speed of the transmission input shaft with gear engaged since a positive accelerating torque can be transmitted only with positive slip on the clutch. This can be achieved, for example, by raising the engine speed above the idling speed. This can be done for example by a request to the engine speed. It can therefore be provided that instead of or in addition to the use of target gear and intermediate target gear, so in particular a gearbox side engagement - an engine-side engagement takes place, which is such that the engine speed even during the free-wheeling function or when the clutch is "artificial" is raised so that it is not kept in particular at its idle speed. Another possibility is that initially a high target gear is engaged when entering the freewheeling function, in which optionally after request of an acceleration request, the clutch is actually closed so that the engine torque is completely transmitted, which is then switched back without traction interruption in a lower gear.

The variants according to the invention-preferably-can also be combined with a functionality for normal operation or for gear changes, which is designed as follows. The traction is replenished according to this functionality in a dual-clutch transmission in certain switching situations on a higher gear than the actual target gear. It may in particular in the so-called. Intermediate circuits between two gears of the same transmission input shaft 22 respectively. 26 During the actual gear change part of the engine torque on a (usually higher) gear on the be transferred to other shaft slipping clutch. So a traction interruption can be prevented. So this is a functionality that is not related to the re-engagement after the state "freewheel". A method according to this functionality can, for example, additionally be controlled by the control unit for the corresponding situations. This functionality can also be omitted.

The inventive method, in particular the method according to the first inventive idea, allows a spontaneous and comfortable change from the driving state "freewheel" to the driving state "train" in dual-clutch transmissions, especially for Vehicles that are relatively sluggish Have internal combustion engines. It will be especially in the phase during which the internal combustion engine still at its target or Einkuppeldrehzahl is accelerated over a higher one Transmit gear as the target gear traction. Compared to the applicant at least internally known design is enabled that accelerating the vehicle on the driver's request more spontaneous at the same or even higher Comfort is done.

It In particular, a method for rapid change of Freewheeling created in the train operation with dual clutch transmissions. In particular, also allows be that sudden Acceleration requirements by increasing the accelerator pedal position while the freewheeling function one possible caused rapid and comfortable acceleration response of the vehicle becomes.

1

motor vehicle

2

electronic control unit

10

engine (Internal combustion engine)

12

powertrain

14

transmission device

16

first partial transmission of 14

18

second partial transmission of 14

20a

gear

20b

gear

22

first Transmission input shaft

24a

wheelset

24b

wheelset

26

second Transmission input shaft

28a

gear

28b

gear

28c

gear

30a

wheelset

30b

wheelset

30c

wheelset

32a

gear

32b

gear

34a

gear

34b

gear

34c

gear

36

wave

38

Drive axle of 1

40

clutch

42

gear actuator

44

electric motor

46

electric motor

48

first Torque transfer device

50

second Torque transfer device

52

Motor output shaft

54

first clutch actuator

56

third electric motor

58

second clutch actuator

60

fourth electric motor

62

accelerator

64

dashed line

Claims (21)

Method for operating a motor vehicle, and in particular for controlling a transmission device of a motor vehicle, said transmission device is integrated or integrated in a motor vehicle driveline drivable by a motor and is designed as a multi-clutch transmission, in particular dual-clutch transmission, so that the transmission device comprises: - a first partial transmission with a first transmission input shaft and with a plurality of sets of wheels for forming engageable and extendable gears, wherein at this first transmission input shaft, a first torque transmitting device is provided; - A second partial transmission with a second transmission input shaft and with a plurality of sets of wheels for the formation of tunable and interpretable gears, wherein at this second transmission input shaft, a second torque transmitting device is provided; comprising the steps of: - opening the drive train by opening the, in particular first and second, torque transmission devices; - monitoring a signal indicating whether an acceleration request is given; Selecting and inserting a predetermined target gear in one of the two partial transmissions, wherein the drive train is still open during this engagement of the target gear, and selecting and engaging a predetermined gear, which is referred to as intermediate target gear, in the other of the two subtransmissions, wherein the drive train is still open in this insertion, wherein the intermediate target gear is selected so that it is higher than the target gear, so that the rotational speed of the transmission input shaft of the sub-transmission in which the current target gear is engaged, is greater than that Rotational speed of the transmission input shaft of the partial transmission, in which the current intermediate target gear is engaged; and - Accelerating the engine and closing the torque transmitting device, which is provided on the transmission input shaft of the partial transmission, in which the intermediate target gear is engaged, if it is determined that an acceleration request is displayed, this torque transfer device is only so far closed that it slips or that the speed of the motor side engaging in this torque transfer device shaft, in particular motor output shaft, faster than the rotational speed of the transmission input shaft of the sub-transmission, in which the intermediate target gear is engaged. Method according to claim 1, characterized in that that this opening of the drive train by opening the first and the second torque transmitting device at moved motor vehicle. Method according to claim 1, characterized in that that this opening of the drive train by opening the first and the second torque transmitting device outside of gear changes he follows. Method according to claim 1, characterized in that that open of the drive train by opening the first and the second torque transmission device for Prevention or reduction of Thrust operating phases occur when it is determined that conditionally by a decrease in the accelerator pedal value, a train operation in the direction a thrust operation is left. Method according to claim 1, characterized in that that signal indicating whether an acceleration request is given by the position change a positionable in different positions accelerator pedal of the motor vehicle depends, are associated with these positions accelerator pedal values, and wherein by an increase the accelerator pedal value an acceleration request is displayed. Method according to claim 1, characterized in that that the target gear is selected in each case so that driving in the medium speed range allows becomes. Method according to claim 1, characterized in that that the respective target gear, which is selected with the powertrain open and is inserted, depending on is selected from the current speed of the motor vehicle. Method according to claim 1, characterized in that that the intermediate target gear is selected such that the speed the transmission input shaft of the sub-transmission in which this intermediate target gear is selected, when the intermediate target gear is less than or equal to the speed the shaft which engages in the torque transmission device on the motor side, arranged on the transmission input shaft of this sub-transmission is. Method according to claim 8, characterized in that that if in the partial transmission in which the intermediate target gear can or should be inserted, several gears exist in which the speed the transmission input shaft of this sub-gear clotting ger or the same The speed of the shaft is in the on this transmission input shaft provided torque transmission device engages the engine side, the smallest of these gears is selected as an intermediate target gear. Method according to claim 1, characterized in that that the intermediate target gear is selected such that the speed the transmission input shaft of the sub-transmission in which this intermediate target gear is selected when the intermediate target gear is less than or equal to the speed the shaft which engages in the torque transmission device on the motor side, arranged on the transmission input shaft of this sub-transmission is, if there is a gear in this part of the gear this Condition met, and the highest Gear of this subtransmission is selected as an intermediate target gear, if there is no gear in this partial transmission of this condition Fulfills. Method according to claim 1, characterized in that after inserting an intermediate target gear and a target gear this Target gear designed and another target gear is inserted, the Drive train still open is. Method according to claim 1, characterized in that after inserting an intermediate target gear and target gear this Intermediate target gear designed and another intermediate target gear is inserted, wherein the drive train is still open. Method according to claim 1, characterized in that that the inter-target gear is different from the gear that as last before opening the drive train was inserted in the partial transmission, via which last a torque introduced by the engine, in particular essentially complete has been. A method according to claim 1, characterized in that after the determination that an acceleration request is displayed, this first and second torque transmission remains open, and the one of these two torque transmitting devices, which is provided on the transmission input shaft of the partial transmission, in wel Chem, the current intermediate target gear is engaged, only when the speed of the motor side engaging in this torque device shaft is greater than or equal to the speed of this transmission input shaft of this sub-transmission in which the current intermediate target gear is engaged, is closed, in such a way that the speed of the motor side engaging in this torque transmission device shaft increases faster than the speed of this transmission input shaft. Method according to claim 1, characterized in that that after closing the torque transmission device, provided on the engine input side of the transmission input shaft of the partial transmission is, in which the intermediate target gear is engaged, and if the Rotational speed of the shaft, which engages in the torque transmission device, in the on the motor side facing away from the transmission input shaft engages the sub-transmission, in which the current target gear is greater as the speed of this transmission input shaft of the sub-transmission, where this current target gear is, the torque transfer device of the sub-transmission is opened with the current intermediate target gear and the torque transmitting device the sub-transmission is closed with the current target gear, wherein this opening and closing is done so simultaneously that the change from the intermediate target gear into the target gear traction interruption free. Method according to claim 15, characterized in that in that the torque transmission device, at the transmission input shaft of the partial transmission with the current Target gear is arranged, at least as far as it is concluded that she does not slip or that the full engine torque over the Transfer target gear becomes. Method according to claim 1, characterized in that that only the target gear selected and is inserted and then the intermediate target gear selected and is inserted. Method according to claim 1, characterized in that that only the intermediate target gear is selected and inserted and subsequently the target gear selected and is inserted. Transmission control device for a motor vehicle transmission device, as an electronic control unit is formed and a memory, a computer unit and a Comprises means for transmitting and receiving signals, by means of this device for sending and receiving Signals signals for controlling a transmission device can be emitted are and where in the memory of this electronic a control program stored in cooperation with the computer unit and the means for transmitting and receiving signals a method according to one of the preceding claims can control. Motor vehicle with a drive train and a Motor for driving this drive train and further with at least a arranged on the motor side facing away from the drive train motor vehicle drive axle, from the engine over the drive train is drivable, wherein in the drive train a Multiple clutch transmissions, in particular dual-clutch transmissions, is arranged, which is a first partial transmission and a second partial transmission and two clutches, wherein further an electronic control unit is provided for driving the multiple clutch transmission, this control unit a method according to a the claims 1 to 18 controls. A method of controlling a drive system of a motor vehicle, said drive system comprising: a powertrain a motor for driving said drive train; - A transmission device with a plurality of sets of wheels for the formation of tunable and interpretable gears, said transmission means comprises at least one torque transmitting device, by means of which the drive train or a respective drive train branch can be opened and closed, - at least one drive shaft, which is arranged on the motor side facing away from the drive train is and is drivable by the engine via the drive train; An electronic control device; - A device such as accelerator pedal, by means of which an acceleration request can be displayed, wherein the drive train is opened by means of at least one torque transmission device for preventing or shortening thrust operating phases, if it is determined that the motor vehicle due to an acceleration request the train operation in the direction leaves the thrust mode, and wherein the electronic control device after this opening of the at least one torque transmitting device and before an acceleration request is displayed at least generates a signal, thereby causing the speed of a motor on the side facing in an open torque transmitting device engaging shaft, in particular motor output shaft , is held in the vicinity or greater than or equal to the speed of a motor on the remote side in this open torque transmitting device engaging transmission input shaft, wherein further with Is ensured by means of the electronic control device, that this transmission input shaft ge via an inserted gear with this drive axle is coupled.