FR2819865A1 - Clutch device for drive train of motor vehicle allows reactivation of creep-process switch-off device when presence of driver is detected - Google Patents

Abstract

The clutch device effects a creeping process in which a substantially reduced torque can be transmitted from the drive shaft to the driven shaft. The creep function is de-activatable and re-activatable. A creep-process switch-off device is connected and/or programmed so that it can only transmit a re-activation signal if the presence of the driver in the vehicle is detected. Independent claims are also included for: (a) a clutch device (b) the use of the clutch device in or for manufacturing a motor vehicle (c) a method of operating a clutch device.

Description

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dispositif de commande peut produire à nouveau (signal de t, réactivation) de tels signaux de sortie. The invention relates to a clutch device which, in the kinematic chain of a motor vehicle equipped with an automated or non-automated gearbox, can be arranged between an input shaft and an output shaft and which can be engaged in different engaged positions, and which includes at least one control device which can at least partially send output signals which, under certain predetermined conditions, cause the clutch device to be engaged in a predetermined engaged position , according to a predetermined characteristic, engagement position in which a substantially reduced torque can be transmitted (creeping running process), where the control device produces in particular the output signals, at least partially taking account of predetermined driving parameters . In addition, the clutch device contains at least one device for cutting off the creeping process which, under certain predetermined conditions, can transmit an input signal to the control device, which input signal causes the control device , regardless of the predetermined driving parameters, no longer produces (deactivation) such output signals which initiate a creeping process, until the device for cutting off the creeping process transmits a signal to the control device, which signal indicates that the

control device can again produce (t signal, reactivation) such output signals.

Such a clutch device is known from the publication DE 100 29 618 Al.

 According to the meaning of the present invention, it is to be understood under the concept of clutch device, in particular a device which can execute a creeping walking process.

 A creeping process, in accordance with the meaning of the invention, is given when the clutch device

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 can transmit essentially reduced torque. Such a creeping walking process is triggered in particular when a motor vehicle fitted with a clutch device according to the invention begins to move at least slowly, while a gear is engaged, while the engine is running. and that the brake device is not actuated, where the clutch device can transmit a reduced torque which corresponds to the drive torque or which is a part of the drive torque. Here, there can occur, under certain predetermined conditions, in particular a slip in the clutch device. The torque which can be transmitted or which is transmitted by the clutch device, during a creeping process, is designated, in the sense of the present invention, as creeping torque.

 A clutch device in the sense of the present invention can in particular carry out a starting process. By starting process, it should be understood that a motor vehicle fitted with a clutch device, when the fuel measuring device, in particular the accelerator pedal, is operated, operates with an engine speed which is substantially higher than idling speed, where the motor vehicle starts at least slowly, the clutch device being at least slightly closed.

 The control device can, under certain predetermined conditions, receive an input signal from the device for cutting off the creeping process. The control device can also send an output signal which can trigger an actuation of the clutch device in a predetermined engagement position, according to a predetermined characteristic.

 These output signals can in particular cause the clutch device to be engaged in a practically open engagement position in which the clutch device cannot transmit any torque or

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 in a practically closed engagement position in which the clutch device can transmit a torque which is greater than a predetermined torque and which, in particular, corresponds to the torque introduced into the clutch device by a drive device. In addition, the output signal from the control device can in particular ensure that the clutch device can only transmit a predetermined creeping torque when predetermined triggering conditions are given.

 In particular, a creeping process is introduced or carried out when a transmission device of a motor vehicle, which has a clutch device mentioned above, is engaged in a gear and that a drive device, forming part of the motor vehicle, is in operation, for example that the engine is running, and that the speed of the motor vehicle is less than a predetermined speed limit and that a device for measuring fuel, such as an accelerator or gas pedal , is not activated. It is preferable that the speed of the motor vehicle, which is lower than a predetermined speed limit, be practically zero, so that the vehicle is stationary or that it is moving at low speed.

 In the context of the present invention, a drive device is in particular an engine, an internal combustion engine or an engine of similar type.

 In the sense of the present invention, a transmission device is in particular a device which can be engaged in stages or continuously in different engagement positions in which the transmission device produces a different transmission ratio between two shafts. The drive can be configured as a step change transmission or as a belt and belt drive or as an analog transmission. Gear changes

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 transmission device between different speed levels can be performed in particular automatically or manually or partially automatically or automatically with the additional possibility of manual intervention. When changing from a first engagement position to a second engagement position, an interruption of the pulling force may or may not take place.

 The transmission device is configured in particular as an automatic transmission or as an automated gearbox.

 An automatic transmission in the sense of the present invention is in particular a transmission device in which the gear changes can be controlled automatically without interruption of the traction force, which transmission device comprises in particular a planetary gear.

 By automated gearbox, in the sense of the present invention, it should be understood in particular a transmission device in which the gear changes can be triggered automatically with interruption of the traction force. The automated gearbox may include at least one electric motor for performing gear changes.

 A gear or gearbox bearing, in the sense of the present invention, is an engaged position in which a predetermined gear is engaged, where the concept of gear applies as well to a step transmission device as 'to a continuous transmission device.

 The control device, which produces output signals for actuating the clutch device, can produce these output signals at least partially taking into account predetermined driving parameters.

 By driving parameter, in the sense of the present invention, it should be understood in particular a

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 parameter which can be modified during the operation of a motor vehicle or its components such as the transmission device or the clutch device.

 The device for cutting off the creeping process can, under certain predetermined conditions, transmit an input signal to the control device.

When the control device receives a predetermined input signal from the ramping process cut-off device, this causes the control device to no longer engage the clutch device in predetermined engagement positions or prevent a pre-determined sequence of switching positions over time. In particular, the control device, after reception of a predetermined input signal coming from the device for cutting off the creeping process, can no longer produce such output signals, at least for a certain predetermined period of time, which output signals would otherwise trigger a creeping clutch process.

 An electronically controlled clutch device is in particular a clutch device which is described or proposed by the applicant under the designation "electronic clutch management (EKM)".

 In this regard, document DE 40 11 850 A1 discloses a method for controlling an automated friction clutch operating between a drive machine and a transmission, for at least one of the operating states such as starting, changing gears , driving, acceleration, braking, reverse, parking or other similar conditions, such as switching between different operating states.

 In addition, document DE 44 26 620 A1 discloses an automated and electronically controlled clutch device for a motor vehicle, which clutch device is connected or programmed in a manner

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 such that when a gear is engaged, the engine is running, the vehicle is stationary or practically stationary, and also that the accelerator pedal is not actuated (power supply measuring element fuel), the clutch can be closed in such a way that reduced torque can be transmitted from the engine to the transmission, whereby a creeping start of the vehicle is triggered.

 In addition, document EP 1 018 606 A2 discloses an electronically controlled clutch device for a vehicle, a clutch device in which a safety device is implemented with a warning indication in the event of starting. with inappropriate speed.

 Clutch devices, such as electronically controlled clutch devices which can initiate a creeping start of an electronically controlled motor vehicle, have been proven in the market and have been found to provide a good opportunity to assist the driver of a motor vehicle during parking maneuvers.

 The known clutch devices have the following drawback, however: since the creeping function triggers a certain amount of energy entering the clutch device, the creeping function is deactivated in the event of an excessive temperature of the clutch is detected, whether this is done by a direct measurement of the temperature or indirectly by a calculation model serving as a basic element. By deactivation, the behavior of the motor vehicle changes. In particular, the driver is no longer automatically "alerted" by the creeping start of the vehicle when he leaves the motor vehicle stationary, a gear being engaged. In normal cases, the vehicle, due to the adjustment (programming) of the clutch electronics, starts in particular

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 immediately by a creeping movement which should alert the driver. When the creep function is deactivated, this is no longer the case. Now, it can relatively easily happen that the driver leaves the motor vehicle, a gear being engaged and the engine continuing to run, without his attention having been drawn to this state.

 It can then happen that the creeping function, following a cooling of the clutch, is activated again and that the motor vehicle starts to move autonomously.

 Another reason for starting autonomously - even if the creeping function is deactivated - is a fault (leak, break) in the clutch release system.

 The object of the invention therefore consists in producing a clutch device which does not have these drawbacks.

 This object is achieved, in accordance with the invention, by a clutch device of the type mentioned initially, which is characterized in that the device for cutting off the creeping process is connected and / or programmed in such a way that it can only send the reactivation signal if the presence of the driver in the motor vehicle is detected.

 This object is further achieved by a clutch device of the type mentioned initially, comprising an automated gearbox, which clutch device is characterized in that the device for cutting off the creeping process is connected or programmed in such a way. , that in the event of deactivation, the neutral gear is engaged automatically.

 The object is also achieved by the use and process claims.

 The object of the invention is therefore a clutch device which, in the kinematic chain of a motor vehicle with an automatic or non-automatic gearbox

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 automated, can be arranged between an input shaft and an output shaft and which can be engaged in different engagement positions, comprising at least one control device which can at least partially send output signals which, under certain conditions predetermined, cause the clutch device to be engaged in a predetermined engagement position, according to a predetermined characteristic, engagement position in which a substantially reduced torque can be transmitted (creeping running process), where the control device produces in particular the output signals, at least partially taking into account predetermined driving parameters; and comprising at least one device for cutting off the creeping process which, under certain predetermined conditions, can transmit an input signal to the control device, which input signal causes the control device to be independent of the predetermined driving parameters , no longer produces (deactivation) such output signals which initiate a creeping process, until the cutoff device of the creeping process transmits a signal to the control device, which signal indicates that the control device can generate again (reactivation signal) such output signals, characterized in that the cut-off device for the creeping process is connected and / or programmed in such a way that this cut-off device cannot transmit the reactivation signal only if the presence of the driver in the vehicle is detected.

 The object of the invention is also a clutch device which, in the kinematic chain of a motor vehicle, can be arranged between an input shaft and an output shaft and which, by means of a box automatic gearbox, can be engaged in different engagement positions, comprising at least one control device which can at least partially send signals

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 output which, under certain predetermined conditions, cause the clutch device to be engaged in a predetermined engagement position, according to a predetermined characteristic, engagement position in which a substantially reduced torque can be transmitted (creeping process) , where the control device produces in particular the output signals, at least partially taking account of predetermined driving parameters; and comprising at least one device for cutting off the creeping process which, under certain predetermined conditions, can transmit an input signal to the control device, which input signal causes the control device to be independent of the predetermined driving parameters , no longer produces (deactivation) such output signals which initiate a creeping process, until the cutoff device of the creeping process transmits a signal to the control device, which signal indicates that the control device can generate again (reactivation signal) such output signals, characterized in that the cut-off device for the creeping process is connected or programmed in such a way that, in the event of deactivation, the neutral gear is engaged automatically.

 Preferred configurations are disclosed in the dependent claims. Individual characteristics or several characteristics disclosed in the independent claims represent, in themselves, or in any combination whatsoever with the characteristics of either of the independent claims, inventive solutions to the problem constituting the basis of the invention .

 In a first preferred configuration of the clutch device according to the invention, the presence of the driver is detectable by recognizing the actuation of the accelerator pedal and / or the brake pedal and / or the

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 handbrake and / or gearshift lever and / or transmission / gearshift device, each with or without gearshift. To do this, sensors can be applied to these actuation means, which sensors, upon actuation of one or more of these actuation means, can send electrical signals to the electronic control device of the device. 'clutch (see for example the document DE 40 11 850 A1, FIG. 1, and the document EP 1 018 606 A2, FIG. 1).

 In a second preferred configuration, the device for cutting off the creeping process is connected and / or programmed in such a way that the neutral gear can only be engaged when the system has detected that the driver has left the motor vehicle. Advantageously, the fact that the driver has left the motor vehicle is detected by actuating the door switch placed on the driver's side of the motor vehicle.

 In a third preferred configuration, the device for interrupting the creeping process is connected or programmed in such a way that when the neutral gear is engaged, the engagement of a gear again is only possible if the presence of the driver in the motor vehicle is detected.

 In a fourth preferred configuration, the device for cutting off the creeping process is connected or programmed in such a way that the reactivation signal can only be sent if the vehicle has started to move, in particular if the vehicle speed automobile is greater than or equal to 5 km / h.

 In addition, preferably, the reactivation signal can only be sent if the actuation of the accelerator pedal and / or the release of the handbrake has been detected.

 In another preferred configuration, the device for cutting off the creeping process is connected or

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 programmed so that upon successful deactivation a warning signal, preferably an audible signal, is provided to the driver when the driver's door is opened.

que la réduction commence à 200oC et que le couple d'embrayage à 300oC est limité à 0 Nm. On peut en arriver ici à la situation suivante : le véhicule est arrêté en ayant une température d'embrayage supérieure à 300oC. Comme conséquence de la limitation du couple d'embrayage, la fonction de marche rampante est en principe coupée, c'est-à-dire qu'en théorie, le conducteur peut quitter le véhicule lorsque la vitesse est enclenchée, le frein de service n'ayant pas été actionné. Le véhicule ne devrait pas pouvoir partir en marche rampante. Si l'embrayage se refroidit et que la température de l'embrayage passe au-dessous de la limite de 300oC, il se constitue, par exemple pendant 6 secondes, un couple de marche rampante. Ce couple d'embrayage est ici limité, correspondant à la fonction de limitation prédéterminée, de sorte qu'après un laps de temps de 6 secondes, on a un couple d'embrayage par exemple de 1,6 Nm. Si le point de prise de l'embrayage n'est pas réglé exactement, ce couple d'embrayage de 1,6 Nm peut provoquer un départ du véhicule se mettant à rouler. In the single figure, the clutch torque is shown according to a ramp function passing through the clutch temperature. To do this, a strategy is implemented in the control software for electronic clutch management (EKM) / automated gearbox (ASG), strategy according to which the wear of the clutch at a temperature of clutch too high is limited. To do this, the clutch torque MR Setpoint value (MRsoll) is reduced according to the ramp function passing through the clutch temperature, function shown in the figure. The ramp is for example configured in such a way,

that the reduction starts at 200oC and that the clutch torque at 300oC is limited to 0 Nm. This can lead to the following situation: the vehicle is stopped with a clutch temperature above 300oC. As a consequence of limiting the clutch torque, the creeping function is in principle cut off, i.e. in theory, the driver can leave the vehicle when gear is engaged, the service brake n 'having not been activated. The vehicle should not be able to start on creep. If the clutch cools down and the temperature of the clutch drops below the limit of 300oC, a creeping torque is generated, for example, for 6 seconds. This clutch torque is limited here, corresponding to the predetermined limitation function, so that after a lapse of 6 seconds, there is a clutch torque for example of 1.6 Nm. If the point of engagement of the clutch is not adjusted exactly, this clutch torque of 1.6 Nm can cause the vehicle to start rolling away.

 The first solution to the problem, mentioned above, can be carried out in particular as follows: if the clutch temperature exceeds a value

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pouvant être choisie à l'avance de façon déterminée, par exemple 300oC, cette valeur est mémorisée dans le logiciel de commande, par exemple par le fait qu'un élément binaire est activé. Si cet élément binaire est activé, pour rester dans l'exemple, aucun couple d'embrayage ne peut plus être constitué. L'élément binaire n'est effacé, du côté du logiciel, que lorsque la présence du conducteur est détectée.

can be chosen in advance in a determined manner, for example 300oC, this value is stored in the control software, for example by the fact that a binary element is activated. If this binary element is activated, to remain in the example, no clutch torque can no longer be formed. The binary element is only deleted on the software side when the presence of the driver is detected.

inférieure (par exemple 200oC) jusqu'à une température limite supérieure (par exemple 300oC), de façon linéaire ou non linéaire, à partir d'une valeur réglée préalablement jusqu'à zéro, dans le cas de la température limite supérieure. Si la température d'embrayage dépasse à présent la température limite inférieure, cette température est mémorisée dans le logiciel de commande, par exemple par le fait qu'un élément binaire est activé. Si cet élément binaire est activé, pour rester dans l'exemple, le couple d'embrayage maximum ne peut être réduit que du côté du logiciel. Une augmentation du couple d'embrayage maximum n'est pas possible lorsque l'élément binaire est activé. L'élément binaire peut être effacé après une détection sans équivoque de la présence du conducteur, de sorte qu'une augmentation du couple d'embrayage maximum est à nouveau possible. Another solution to this problem can in particular be implemented as follows: in the clutch control software, a strategy can be implemented, according to which the transmissible clutch torque is limited to a value Max. In order not to allow the clutch wear to become too great at too high a temperature, the maximum value can be lowered as the temperature increases, for example a maximum value in which the wear can be reduced in the temperature range from of a limit temperature

lower (for example 200oC) to an upper limit temperature (for example 300oC), linearly or non-linearly, from a value previously set to zero, in the case of the upper limit temperature. If the clutch temperature now exceeds the lower limit temperature, this temperature is stored in the control software, for example by the fact that a binary element is activated. If this binary element is activated, to remain in the example, the maximum clutch torque can only be reduced on the software side. An increase in maximum clutch torque is not possible when the binary element is activated. The binary element can be deleted after an unequivocal detection of the presence of the driver, so that an increase in the maximum clutch torque is again possible.

 The claims provided with the application are proposed formulations without prejudging the obtaining of extended patent protection. The depositor reserves the right to claim still others

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combinaisons de caractéristiques divulguées jusqu'à présent seulement dans la description ou d'autres combinaisons quelconques de caractéristiques divulguées dans la description.

combinations of features disclosed to date only in the description or any other combinations of features disclosed in the description.

 References used in subclaims refer to the alternate configuration of the subject matter of the main claim; these references should not be understood as a renunciation of obtaining protection independent of the subject, for the combination of characteristics of the subclaims to which reference is made.

caractéristiques par"ou", ce"ou"est à chaque fois à comprendre d'une part comme un"ou"mathématique et d'autre part à chaque fois comme l'autre possibilité d'un"ou" exclusif. It should be noted that with regard to

characteristics by "or", this "or" is each time to be understood on the one hand as a "or" mathematical and on the other hand each time as the other possibility of an "or" exclusive.

 It should furthermore be indicated that the achievements concerning all known arrangements which do not relate to defined publications, which are known first of all to the applicant or the inventor, so that the applicant or the inventor reserves the right the right of protection for these achievements insofar as they are not known to the public either.

 It should also be indicated that the concept of control as well as the concept which results from it in the sense of the invention are to be understood by being taken in the broad sense.

The concept includes in particular regulation and / or control in the sense of the German industrial standard (DIN).

 The claims provided with the application are proposed formulations without prejudging the obtaining of extended patent protection. The applicant reserves the right to claim yet another combination of features disclosed so far only in the description and / or in the drawings.

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 References used in subclaims refer to the other configuration of the subject matter of the main claim, by the features of the respective subclaim; these references should not be understood as a waiver of obtaining object-independent protection for the combinations of features of the subclaims to which reference is made.

 Since the subject-matter of the sub-claims may constitute, with regard to the current state of the art, own and independent inventions on the priority date, the applicant reserves the right to be the subject of independent claims or make declarations of division. These claims may also further contain independent inventions which include a form independent of the subject matter of the preceding sub-claims.

 The exemplary embodiments should not be understood as being a limitation of the invention. Furthermore, many changes and modifications are possible within the scope of this disclosure, in particular variations, elements, combinations and / or materials such as those which, for example by combination or by variation, may be taken from features or individual elements described in the general description, in association with the embodiments as well as with the claims, and contained in the drawings, or taken from process steps for those skilled in the art relating to the solution of the invention and which, by characteristics which can be combined, lead to a new object or to new process steps or to new sequences of process steps, insofar as they also relate to manufacturing processes , control and work.

Claims (19)

CLAIMS 1. Clutch device which, in the kinematic chain of a motor vehicle equipped with an automated or non-automated gearbox, can be disposed between an input shaft and an output shaft and which can be engaged in different engagement positions, including at least one control device which can at least partially send output signals which, under certain predetermined conditions, cause the clutch device to be engaged in a predetermined engagement position, according to a characteristic predetermined, engagement position in which a substantially reduced torque can be transmitted (creeping process), where the control device produces in particular the output signals, at least partially taking into account predetermined driving parameters; and comprising at least one device for cutting off the creeping process which, under certain predetermined conditions, can transmit an input signal to the control device, which input signal causes the control device to be independent of the predetermined driving parameters , no longer produces (deactivation) such output signals which initiate a creeping process, until the cutoff device of the creeping process transmits a signal to the control device, which signal indicates that the control device can generate again (reactivation signal) such output signals, characterized in that the cut-off device for the creeping process is connected and / or programmed in such a way that this cut-off device cannot transmit the reactivation signal only if the presence of the driver in the vehicle is detected. <Desc / Clms Page number 16> 2. A clutch device according to claim 1, wherein the presence of the driver can be detected by recognizing the actuation of the accelerator pedal and / or the brake pedal and / or the hand brake and / or the gear shift lever and / or a transmission / gear change device. 3. Clutch device according to claim 1 or 2, wherein the device for cutting off the creeping process is connected or programmed in such a way that, in the event of deactivation, the neutral gear is engaged automatically. 4. Clutch device which, in the kinematic chain of a motor vehicle, can be arranged between an input shaft and an output shaft and which, by means of an automated gearbox, can be engaged in different engagement positions, comprising at least one control device which can at least partially send output signals which, under certain predetermined conditions, cause the clutch device to be engaged in a predetermined engagement position, according to a predetermined characteristic , engagement position in which a substantially reduced torque can be transmitted (creeping process), where the control device produces in particular the output signals, at least partially taking account of predetermined driving parameters; and comprising at least one device for cutting off the creeping process which, under certain predetermined conditions, can transmit an input signal to the control device, which input signal causes the control device to be independent of the predetermined driving parameters , <Desc / Clms Page number 17>  no longer produces (deactivation) such output signals which initiate a creeping process, until the cutoff device of the creeping process transmits a signal to the control device, which signal indicates that the control device can generate again (reactivation signal) such output signals, characterized in that the device for cutting off the creeping process is connected or programmed in such a way that, in the event of deactivation, the neutral gear is engaged automatically . 5. The clutch device according to claim 4, in which the device for cutting off the creeping process is connected and / or programmed in such a way that the cutting device can only send the reactivation signal if the presence of the driver in the motor vehicle is detected. 6. Clutch device according to one of claims 3 to 5, where the device for cutting off the creeping process is connected and / or programmed in such a way that the neutral gear can only be engaged if the system has detected that the driver has left the motor vehicle. 7. The clutch device according to claim 6, in which the fact of having left the vehicle can be detected by actuation of the door switch placed on the driver's side of the motor vehicle. 8. Clutch device according to one of claims 3 to 7, where the device for cutting off the creeping process is connected or programmed in such a way that, when the neutral gear is engaged, a speed does not <Desc / Clms Page number 18>  can be re-engaged only if the presence of the driver in the motor vehicle is detected. 9. A clutch device according to claim 8, in which the presence of the driver can be detected by recognizing the actuation of the accelerator pedal and / or the brake pedal and / or the hand brake and / or the gear shift lever and / or a transmission / gear change device. 10. Clutch device according to one of the preceding claims, in which the reactivation signal can only be sent if the vehicle has started to move. 11. The clutch device according to claim 10, wherein the reactivation signal can only be sent if the vehicle speed is greater than or equal to 5 km / h. 12. The clutch device according to claim 10 or 11, wherein the reactivation signal can only be sent if the actuation of the accelerator pedal or the release of the handbrake has been detected. 13. Clutch device according to one of the preceding claims, in which the device for cutting off the creeping process is connected or programmed in such a way that, upon successful deactivation, a warning signal is supplied to the driver when from the driver's door opening. 14. Use of clutch devices according to one of the preceding claims in or for the manufacture of motor vehicles. <Desc / Clms Page number 19> 15. Method for operating a clutch device which, under certain predetermined conditions relating to a motor vehicle, can trigger a creeping start process, method in which this creeping process can be deactivated and reactivated, thereby that reactivation can only be carried out if the presence of the driver in the motor vehicle has been detected. 16. Method for operating a clutch device which, under certain predetermined conditions relating to a motor vehicle equipped with an automated gearbox, can trigger a creeping start process, method in which this creeping process can be deactivated or reactivated, by the fact that, during deactivation, the neutral gear is engaged automatically. 17. The method of claim 16, wherein the neutral gear can only be engaged if the system has detected that the driver has left the motor vehicle. 18. Method according to any one or more of claims 15 to 17, in which reactivation can only be carried out if the presence of the driver in the motor vehicle has been detected. 19. The method of claim 18, wherein the presence of the driver is detected by recognition of the actuation of the accelerator pedal and / or the brake pedal and / or the hand brake and / or the change lever and / or a transmission / gear change device.