DE102009026625A1 - Method for operating a drive train - Google Patents

Abstract

The invention relates to a method for operating a drive train of a motor vehicle, wherein the drive train is a drive unit (1), an automatic or automated transmission (2) connected between the drive unit (1) and an output drive (3) and an engine-side power take-off (5 ), wherein the drive unit (1) is associated with a motor control device (6) for controlling and / or regulating the operation of the drive unit and the transmission (2) a transmission control device (7) for controlling and / or regulating the operation of the transmission. According to the invention, an engine torque signal provided by the engine control device (6) is corrected on the basis of a torque extraction of the engine-side power take-off (6), whereby the operation of the transmission (2) is controlled and / or regulated on the basis of the engine torque signal corrected by the torque extraction of the power take-off (5) ,

Description

The The invention relates to a method for operating a drive train of a motor vehicle according to the preamble of claim 1 or 11.

The Main components of a drive train of a motor vehicle are a drive unit and a transmission. The transmission converts speeds and torques and so sets the traction power supply of the drive unit and provides the same at an output of the drive train ready. The drive unit of a drive train is a motor control device for controlling and / or regulating the operation of the drive unit and the transmission of a drive train is a transmission control device assigned to the control and / or regulation of the operation of the transmission. The Engine control unit exchanges this with the drive unit and the transmission control device with the transmission data or Signals off. Furthermore, the engine control device and the transmission control device mutually data or signals change.

Out The prior art further discloses that a powertrain a motor vehicle may include a power take-off, wherein a power take-off also known as Power Take Off (PTO). In a power take-off it can be a transmission-side power take-off or a act on the engine-side power take-off. An engine-side power take-off branches off immediately from the drive unit a moment. A transmission-side power take-off on the other hand, the transmission gives off a moment.

From the DE 10 2004 027 294 A1 a method for coupling a power take-off to a transmission is known in which it is checked whether predetermined conditions are met for the coupling process, wherein depending on the coupling process is approved or rejected.

The in the DE 10 2004 027 294 A1 As already mentioned, the disclosed measures all relate to a method for operating a drive train with a transmission-side power take-off.

Of these, Based on the present invention, the problem underlying a novel method for operating a drive train of a To provide motor vehicle with a power take-off on the engine side.

This Problem becomes according to a first aspect of the invention by a method solved according to claim 1. After that it will on the basis of a torque extraction of the engine-side power take-off engine torque signal provided by the engine control device corrected, the operation of the transmission based on the order the torque extraction of the PTO corrected engine torque signal controlled and / or regulated.

To In a second aspect of the invention, this problem is addressed by A method according to claim 11 solved. hereafter is in the transmission control device based on driving state data and driver request data determines whether an activated, motor-side Power take-off based on a torque extraction of the same allowed or not, and if it is determined that an activated, motor-side power take-off is inadmissible when an activation request for the engine-side PTO, the activation of the same being affected.

With In both aspects of the present invention, the operation may a powertrain with an engine-side PTO improved become. According to the first aspect of the invention is based on a torque extraction of the engine-side PTO, the engine torque signal corrected so as to be based on the corrected engine torque signal to control and / or regulate the transmission.

In the transmission control device implemented control functions and / or control functions are based on the corrected engine torque signal performing, for example, decisions of a shift strategy the transmission control device based on which, for example, circuits be triggered, can be taken more accurately. Furthermore, adaptations of the transmission control device, which depend on the engine torque, more precisely executed become.

To The second aspect of the invention determines the transmission control device based on driving condition data as well as driver request data, whether an activated engine-side power take-off based on a Torque extraction is permitted. Is an activated, motor-side PTO inadmissible, so is at a Activation request for the PTO the activation of the same, in particular in that activation of the power take-off delayed by a defined period of time is and / or the torque removal of the power take-off limited so is that an activation of the same is allowed. hereby can be avoided that by a torque extraction of the engine side PTO critical or unfavorable driving conditions for the motor vehicle.

The two aspects of the present invention may be used alone or in combination be used together.

preferred Further developments of the invention will become apparent from the dependent claims and the description below. An embodiment The invention is but not limited to Hand of the drawing explained in more detail. Showing:

1 a block diagram of a drive train of a motor vehicle, in which the inventive method for operating a drive train can be used.

1 shows very schematically a drive train scheme of a drive train of a motor vehicle, wherein the in 1 shown drive train a drive unit 1 as well as a transmission 2 includes, which between the drive unit 1 and a downforce 3 is switched. Between the drive unit 1 and the gearbox 2 is a starting clutch 4 connected. On the drive unit 1 engages a power take-off 5 at. The power take-off 5 is therefore as a motor-side power take-off 5 educated. With the drive unit 1 it can be an internal combustion engine or a hybrid drive. In the transmission 2 it is preferably an automatic or automated manual transmission.

According to 1 is the drive unit 1 an engine control device 6 assigned by means of which the operation of the drive unit 1 can be controlled or regulated. The transmission 2 is a transmission control device 7 assigned by means of which the operation of the transmission 2 can be controlled and / or regulated. The transmission control device 7 exchanges with the gearbox 2 and the engine control device 6 with the drive unit 1 Data or signals off. 1 further clarifies that the engine control device 6 and the transmission control device 7 exchange data with each other.

According to a first aspect of the invention, a method for operating a drive train with a power take-off on the engine side 5 is concerned, it is proposed that on the basis of a torque extraction of the engine-side power take-off 5 one from the engine control device 6 provided engine torque signal is corrected, and that the operation of the transmission 2 based on the torque extraction of the engine-side power take-off 5 corrected engine torque signal is controlled and / or regulated.

According to a development of the first aspect of the invention, the torque extraction of the engine-side power take-off is 5 so determined that based on one of the power take-off 5 provided signal, which gives information about whether the power take-off 5 is active or not, and based on a model of the power take-off 5 the torque extraction of the same is determined by calculation. Based on the mathematically determined torque extraction of the engine-side power take-off 5 Then, the engine torque signal can be corrected to the operation of the transmission based on the corrected engine torque signal 2 more precisely to control and / or to regulate.

Preferably, the torque extraction of the engine-side power take-off in the transmission control device 7 determined, namely such that the transmission control device 7 either directly from the power take-off 5 according to the dash-dotted lines of the 1 or with the interposition of the engine control device 6 according to the dashed lines of the 1 the signal is provided about which gives information about whether the engine-side power take-off 5 is active or not. The transmission control device 7 then determines based on this signal and one in the transmission control device 7 deposited model of the power take-off 5 the torque extraction of the same, so in the transmission control device 7 that of engine control device 6 provided engine torque signal to the torque extraction of the engine-side power take-off 5 to correct.

Alternatively, it is also possible that the torque extraction of the engine-side power take-off 5 in the engine control device 6 is determined, namely the fact that the engine control device 6 from the power take-off 5 the signal is provided about which gives information about whether the engine-side power take-off 5 is active or not, in which case the engine control device 6 based on this signal and one in the engine control device 6 deposited model of the engine-side power take-off 5 the torque extraction of the engine-side power take-off 5 determined.

The correction of the engine torque signal to the torque extraction of the engine-side power take-off 5 can then by the transmission control device 7 or the engine control device 6 be performed.

According to a further variant of the first aspect of the present invention, it can be provided that the engine-side power take-off 5 independently determines its torque extraction and the transmission control device 7 or the engine control device 6 provides. In this case, then no model in the transmission control device 7 or the engine control device 6 required. In this case, then the correction of the engine torque signal to the momen tapping of the engine-side power take-off 5 in the transmission control device 7 or the engine control device 6 respectively.

According to a further advantageous development of the first aspect of the invention, it is proposed that the transmission control device 7 Checks whether the torque extraction of the engine-side power take-off 5 can be determined with sufficient accuracy, so if the engine torque signal can be corrected with sufficient accuracy. Represents the transmission control device 7 determines that the engine torque signal can not be corrected with sufficient accuracy, it is proposed that the transmission control device 7 in this case control functions and / or control functions of the transmission control device 7 disabled.

Only when the engine torque signal can be corrected with the required accuracy should the execution of control functions and / or control functions in the transmission control device 7 be admitted, namely on the basis of a correspondingly accurately corrected engine torque signal.

at the control functions and / or control functions, which then when the Engine torque signal not corrected with sufficient accuracy can be disabled, it can be security-related Act control functions and / or control functions. It is about but neither mandatory nor primarily safety-related control functions and / or control functions. They are generally such control functions and / or control functions that makes sense only with a correct one Engine torque signal can be performed, so z. B. the adaptation of a clutch characteristic. Consequences of a wrong one Adaptation with incorrect motor torque signal would be particular Loss of comfort, because then a momentum / torque reduction the clutch is not at the desired speed he follows. Then, if the torque build-up is too low, the drive unit tends in a circuit design to spin. Then, when The moment structure is too high or too low, tooth-on-tooth positions can not or only badly resolved. At another Control function and / or control function that makes sense only with a correct Motor torque signal can be performed, it is a traction help function. With incorrect motor torque signal If necessary, a starting speed is calculated incorrectly and / or a release of a brake is too late or too early.

The core of the first aspect of the present invention is therefore to correct engine torque signals, namely based on the torque extraction of an engine-side power take-off 5 to provide control functions and / or control functions in the transmission control device on the basis of a corrected engine torque signal 7 to execute more precisely or to deactivate in extreme cases. The determination of the torque extraction of the engine-side power take-off 5 may be based on a in the engine control device 6 and / or the transmission control device 7 deposited model of the engine-side power take-off 5 respectively. Alternatively, it is possible that the engine-side power take-off 5 determined its torque extraction independently.

Can the torque extraction of the engine-side power take-off 5 can not be determined with sufficient accuracy, so control functions and / or control functions of the transmission control device 7 be deactivated. According to the first aspect of the invention is therefore based on the torque extraction of the engine-side power take-off 5 the operation of the gearbox 2 affected.

According to a second aspect of the present invention, which can be used in combination with the first aspect of the invention described above, is in the transmission control device 7 based on driving condition data, such as vehicle speed and / or vehicle acceleration and / or vehicle inclination, as well as based on driver input data, such as accelerator operation and / or brake pedal operation, verifies that an activated, engine-side PTO 5 based on a snapshot of the same is allowed or not. If this is determined that an activated, engine-side power take-off 5 is permissible, so influences the transmission control device 7 at an activation request for the engine-side power take-off 5 its activation is not. Furthermore, an optionally already activated, engine-side power take-off 5 unaffected.

On the other hand, represents the transmission control device 7 on the basis of the driving condition data as well as driver's request data as well as on the basis of the torque extraction of the engine-side power take-off 5 determines that an activated, engine-side power take-off is inadmissible, so is in an activation request for the engine-side power take-off 5 the activation of the same influenced, and preferably by the fact that the activation of the engine-side power take-off 5 Delayed by a defined period of time and / or the torque extraction of the engine-side power take-off 5 is limited so that an activation of the same is allowed.

Likewise, in this case, in the case of an already activated power take-off, the activation of the same can be influenced in such a way that the already activated power take-off fourth power take-off is disabled and / or the torque extraction of the already activated power take-off 5 is limited so that the activation of the same is allowed again.

The second aspect of the present invention is based on the finding that it is for the function of a power take-off on the engine side 5 , For example, a refrigerated box of the motor vehicle, can be harmless to delay the activation of the same by a defined period of time and / or influence the activation thereof so that a torque extraction is reduced so that the activation of the same is allowed. In an analogous manner, an already activated, engine-side PTO 5 deactivated for a defined period of time and / or its torque extraction can be reduced.

According to the second aspect of the present invention, it is possible, for example, that when it is determined from driving state data that the drive unit 1 of the motor vehicle is not started, the activation of the engine-side accessory 5 is suppressed because when the drive unit is stopped 1 no moment can be taken from this anyway, so that the activation of the engine-side accessory 5 would have no effect for the same.

Rather, disadvantages for a subsequent starting the drive unit with simultaneously activated motor-side power take-off 5 be avoided as a drive unit 1 with activated, engine-side power take-off 5 can only be started with lower efficiency.

Likewise, according to the second aspect of the present invention is possible when it is detected based on driving condition data that the motor vehicle is operated in a slope on the mountain, and based on driver's desired data, a start or a shift in the mountain is detected, the activation of the engine side PTO 5 to suppress, so as to allow a trouble-free starting or shifting in the mountain at low coupling load.

According to an advantageous development of the second aspect of the present invention, it is proposed that the transmission control device 7 initiated influencing of the activation of the engine-side power take-off 5 from the engine-side power take-off 5 is suppressed, namely, when the of the transmission control device 7 initiated influencing the activation of the power take-off 5 is inadmissible. For example, in a trained as a refrigerated box power take-off 5 from the transmission control device 7 initiates a delayed activation of the same, but the same notes that its contents heated excessively, it may by the transmission control device 7 initiated influencing the activation of the refrigerated box are suppressed by the same itself.

To The second aspect of the present invention is prioritized the driving performance and / or the driving comfort compared to the engine-side PTO made. Then, if a function, which met with an activated motor-side power take-off should be or is met, compared to the mileage and / or the ride comfort a higher priority or importance, then the activation of the engine side PTO approved. For this purpose, a control device of the engine side PTO or the engine-side PTO itself a deactivation the engine-side power take-off z. B. overwrite by the transmission control device.

A Deviating handling is possible if at activated motor-side PTO as a result of its power extraction the vehicle his driving ability would lose the vehicle but has to be moved. In this case, then would have the Driving ability a higher priority or Importance than the activation of the engine-side power take-off.

The present invention relates, as already stated several times, a method for operating a drive train with a power take-off on the engine side 5 , Such a motor-side power take-off 5 engages directly on the drive unit 1 So before the start clutch 4 , on the powertrain.

The engine-side power take-off 5 is preferably via a hydraulic pump or an electric generator to the drive unit 1 coupled, so a time delay in the activation of the engine-side power take-off 5 and / or a temporal deactivation of the engine-side power take-off 5 and / or a reduction in the torque extraction of the engine-side power take-off 5 via a corresponding influencing of the hydraulic pump or the electric generator in each operating state of the motor vehicle, that is, during the drive thereof. This is a significant difference to such power take-offs, which can be mechanically coupled to the output, in particular to a transmission, or decoupled from the same only at standstill of the motor vehicle, as for such power take-offs a time delay of activation or a time deactivation can not be realized.

1

power unit

2

transmission

3

output

4

clutch

5

PTO / Power Take off

6

Motor controller

7

Transmission control device

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102004027294 A1 [0004, 0005]

Claims (15)

A method for operating a drive train of a motor vehicle, wherein the drive train comprises a drive unit, an interposed between the drive unit and an output, automatic or automated transmission and an engine-side power take-off, wherein the drive unit, a motor control device for controlling and / or regulating the operation of the drive unit and the transmission is associated with a transmission control device for controlling and / or regulating the operation of the transmission, characterized in that based on a torque extraction of the engine-side power take-off, an engine torque signal is corrected, and that controls the operation of the transmission based on the corrected by the torque extraction of the power take-off engine torque signal and / or regulated. Method according to claim 1, characterized in that that the torque extraction of the power take-off is determined in such a way that based on a signal, which sheds light on it indicates whether the power take-off is active or not, and based on a model of the power take-off the torque extraction of the power take-off is determined. Method according to claim 2, characterized in that that the torque extraction of the power take-off in the transmission control device is determined, namely such that the transmission control device from the power take-off or from the engine control device the signal about which is provided about it indicates whether the PTO is active or not, and that the transmission control device based on this signal and one in the transmission control device deposited models of the power take-off the torque extraction of the power take-off determined. Method according to claim 3, characterized that the engine torque signal to the torque extraction of the power take-off is corrected in the transmission control device. Method according to claim 2, characterized in that that the torque extraction of the power take-off in the engine control device is determined, namely such that the engine control device the signal is provided by the power take-off over it, which gives information about whether the power take-off is active or not, and that the engine control means based on this signal and one stored in the engine control device Models of the power take-off determines the torque extraction of the power take-off becomes. Method according to claim 5, characterized in that that the engine torque signal to the torque extraction of the power take-off in the transmission control device and / or in the engine control device is corrected. Method according to claim 1, characterized in that that determines the torque extraction of the PTO from the PTO and the transmission control device is provided, wherein the engine torque signal to the torque extraction of the PTO in the transmission control device is corrected. Method according to claim 1, characterized in that that determines the torque extraction of the PTO from the PTO and the engine control device is provided, wherein the Motor torque signal to the torque extraction of the PTO in the Transmission control device and / or in the engine control device is corrected. Method according to one of claims 1 to 8, characterized in that the transmission control device based on corrected by the torque extraction of the power take-off Motor torque signal controls the operation of the transmission and / or regulates that control functions and / or control functions, for the engine torque signal does not provide the required accuracy can be corrected, disabled. Method according to one of claims 1 to 9, characterized in that the transmission control device based on corrected by the torque extraction of the power take-off Motor torque signal controls the operation of the transmission and / or regulates that control functions and / or control functions, for which corrects the engine torque signal with the required accuracy can be performed based on the corrected engine torque signal become. A method for operating a drive train of a motor vehicle, wherein the drive train comprises a drive unit, an interposed between the drive unit and an output, automatic or automated transmission and an engine-side power take-off, wherein the drive unit, a motor control device for controlling and / or regulating the operation of the drive unit and the transmission is associated with a transmission control device for controlling and / or regulating the operation of the transmission, characterized in that it is determined in the transmission control device based on driving condition data and driver request data, whether an activated, engine-side power take-off based on a torque extraction of the same is permissible or not, said then, if it is determined that an activated PTO is inadmissible is an activation request for the engine-side PTO, the activation of the same is affected. Method according to claim 11, characterized in that that the activation of the power take-off is influenced in such a way that the activation of the power take-off is delayed by a defined period of time becomes. Method according to claim 11 or 12, characterized that the activation of the power take-off is influenced in such a way that the torque extraction of the power take-off is limited so that an activation of the same is allowed. Method according to one or more of the claims 11 to 13, characterized in that when determined is that an already activated power take-off inadmissible is disabled, the already activated power take-off and / or the Torque removal of the already activated PTO so limited is that an activation of the same is allowed. Method according to one or more of the claims 11 to 14, characterized in that the of the transmission control device initiated influencing the activation of the PTO from the PTO is then suppressed when influencing the activation of the power take-off is inadmissible.