Automatic door opening device and motor vehicle with automatic door opening device

Abstract

The invention relates to an automatic door opening device, in particular for use in a motor vehicle, comprising a housing (20), a tappet (22) which is mounted in the housing (20) in a longitudinally movable manner, and an electric tappet drive (24) which is designed to move the tappet (22) back and forth between a rest position in which the tappet (22) is retracted into the housing (20) and an actuation position out of the housing (20), the automatic door opening device is characterized in that a mechanical auxiliary drive (26) is provided in addition to the electric tappet drive (24), which auxiliary drive is designed to be able to displace the tappet (22) from the rest position into the actuation position when activated.

Description

Technical Field

[0001] The invention relates to an automatic door opening device according to the preamble of claim 1, in particular for use in a motor vehicle. The invention also relates to a motor vehicle according to claim 8, comprising a vehicle body and at least one door with an electrically actuable door lock and at least one such automatic door opening device. Background Art

[0002] The requirements for the increased aerodynamics of motor vehicles have resulted in the fact that in many motor vehicles today, the exterior door handles are already recessed and are only moved out of the door by an electric motor when necessary. However, even such recessed door handles still cause air resistance, which people would rather avoid.

[0003] Motor vehicles are being developed in which the doors no longer have any external door handles at all. Instead, for example, only a small actuation point is provided in or under the door skin, but no or not sufficiently high traction can be applied to the door via this actuation point in order to be able to open the door from the outside. An electric door opening mechanism is usually activated via this actuation point, which presses the door slightly out of the door opening of the vehicle body when the door lock is unlocked, so that the door can be grasped at the door edge and pulled open. This is well known on the market, for example in body covers for luggage compartments or in tailgates of vans that are not used for passengers to get on and off.

[0004] Such an opening mechanism for a vehicle body bonnet or a vehicle door has an automatic door opening device, a so-called door presenter, which is arranged in the vehicle door and which opens the vehicle door a small gap by pressing a tappet against the lock bow of a door lock or against a side frame at the edge of the vehicle body door opening. The tappet is driven by a small and compact electric motor and is designed only to apply a relatively small force, which is sufficient to press the door slightly out of the door opening of the vehicle body in the normal state. If, for example, the door freezes in winter or if the vehicle is switched to a de-energized state due to an accident, the electric tappet drive no longer works in the desired manner. Therefore, this known door presenter can neither generate large forces nor is it ready for use when the vehicle is powered off; it can only work when the onboard power supply of the motor vehicle is functioning normally. Summary of the invention

[0005] The object of the present invention is to provide an improved automatic door opening device which can operate reliably even when a large opening force is required and after a vehicle collision. In addition, the object of the present invention is to provide a motor vehicle with such an automatic door opening device, at least one door of which can be opened reliably even under difficult conditions and also after an accident.

[0006] The part of this object which is directed to an automatic door opening device is achieved by an automatic door opening device having the features of claim 1 .

[0007] An automatic door opening device, in particular for use in a motor vehicle, comprises a housing, a tappet mounted in the housing so as to be longitudinally movable, and an electric tappet drive, which is designed to move the tappet back and forth between a rest position retracted in the housing and an actuation position extending out of the housing. According to the invention, the automatic door opening device is characterized in that, in addition to the electric tappet drive, a separate, preferably mechanical auxiliary drive is provided, which is designed to be able to move the tappet from the rest position into the actuation position when activated.

[0008] In normal operation, the electric tappet drive, which forms an electromotive or electromagnetic actuator for actuating the tappet, ensures that during the opening process the tappet moves from its rest position when the door is completely closed into its actuating position and exerts a relative force between the door and the body so that the door opens by the tappet stroke and is placed in a so-called gripping position, in which the door can be gripped from the outside with one hand and fully opened. However, if the force of the electric tappet drive is no longer sufficient to push the door into the gripping position in the event of an overload, for example because the door or the door seal freezes in winter, an auxiliary drive separate from the electric tappet drive can be activated and can assist the electric tappet drive in auxiliary operation with the opening force additionally exerted by the auxiliary drive.

[0009] The auxiliary drive does not require any electrical energy to move the tappet, but rather has an energy accumulator, preferably a mechanical energy accumulator, for this purpose. Instead of a mechanical energy accumulator, a pneumatic or hydraulic pressure accumulator can be provided as an energy accumulator, which, when the auxiliary drive is triggered, actuates, for example, a piston-cylinder unit by means of the pressure fluid stored therein, which exerts an axial force on the tappet and moves the tappet axially. Alternatively, the energy accumulator can have a pyrotechnic actuator, which—as in an airbag, for example—generates an expanding pressure fluid by igniting a chemical substance, which then also actuates, for example, a piston-cylinder unit.

[0010] If the electric tappet drive is no longer operational during a power failure, the auxiliary drive provided according to the invention can be activated for emergency operation of the automatic door opener, which uses its stored energy to move the tappet from the rest position into the actuated position.

[0011] Other preferred and advantageous design features of the automatic door opening device according to the present invention are the technical solutions of dependent claims 2 to 7.

[0012] It is particularly advantageous if the electric tappet drive has an electric or electromagnetic drive. This electric or electromagnetic drive, for example an electric motor or an electromagnet, generates the forces required to move the tappet from its rest position into the actuating position and also from the actuating position back into the rest position during normal operation. Preferably, the electric or electromagnetic drive also drives a mechanical transmission arranged between the electric or electromagnetic drive and the tappet for this purpose.

[0013] It is also particularly advantageous if the auxiliary drive has or is formed by a spring, which acts between the housing and the tappet and which, in the ready position, is prestressed toward the actuating position of the tappet and is held in this prestressed state by the restraining device. The spring forms a mechanical energy store which can apply the necessary force for displacing the tappet independently of the electrical energy supply. It is advantageous if the spring is a compression spring. The restraining device can be triggered mechanically or electrically to release the spring.

[0014] It is particularly advantageous if the restraining device can be electrically triggered to release the spring. This reduces the mechanical complexity of the construction and simplifies the design of the triggering device for the restraining device, which can be formed, for example, by an electric button or switch arranged in the door skin or in the body skin for electrically actuating the restraining device, which, when actuated, triggers the restraining device of the automatic door opening device of the associated door or preferably centrally triggers the restraining devices of the automatic door opening devices of all doors.

[0015] In a preferred further improvement of the automatic door opening device according to the present invention, the tappet drive is configured to move the tappet from the operating position to the rest position against the force of the spring when the auxiliary drive is triggered and to secure the spring in a pre-tensioned state by means of a restraining device. Thus, after the spring of the auxiliary drive is triggered, the tappet drive can tension the spring again and the auxiliary drive can return from the position triggered in the emergency operation to its ready position.

[0016] A further development of the invention is particularly preferred, in which a locking device is provided, which is designed to lock the tappet in the actuated position, which is moved into the actuated position by the activated auxiliary drive during the emergency operation. This locking ensures that the door opened during the emergency operation can no longer be completely closed again, even with great effort, and can therefore only be returned to the gripping position at most.

[0017] The part of this object which is directed to a motor vehicle is achieved by a motor vehicle having the features of claim 8 .

[0018] A motor vehicle comprising a vehicle body and at least one door with an electrically operable door lock and at least one automatic door opening device according to the invention is characterized in that the at least one automatic door opening device is arranged in a force-effective manner between the vehicle door and a door frame on the vehicle body side or other components fixed to the vehicle body. The automatic door opening device can be installed on the door or on the vehicle body or other components fixed to the vehicle body. A vehicle door in the sense of the invention can be understood as any openable cover of a vehicle body opening, in particular a typical swing door, a sliding door or other vehicle body flap (such as a rear flap or a front flap). The automatic door opening device according to the invention is suitable for all these types of openable covers of vehicle body openings. An automatic door opening device can be provided for each vehicle door or flap, or a plurality of automatic door opening devices can also be provided for one vehicle door or flap.

[0019] Preferably, an electric control device is provided, which is designed to supply electric energy to the electrically actuatable door lock and the tappet drive when the electric contact transmitter is actuated, and the control device is designed to unlock the electrically actuatable door lock and to electrically or electromechanically trigger the restraint device and thereby activate the auxiliary drive when the electric contact transmitter is actuated in the event of an overload of the tappet drive () or after receiving a crash signal representing a vehicle accident. If, for example, in winter, under high air humidity and very cold conditions, the door freezes, so that the force of the tappet drive is no longer sufficient and the tappet drive is overloaded, the auxiliary drive is additionally activated to be able to put the door into the gripping position. If, on the other hand, a crash signal is triggered in the event of an accident, the control device transitions to an emergency mode, in which the electric contact transmitter (for example, an electric button or switch arranged in the door skin or the body skin) no longer activates the electric tappet drive when actuated, but triggers the restraint device and thereby activates the auxiliary drive, which then puts the vehicle door into the gripping position using mechanical energy.

[0020] In a preferred embodiment of the motor vehicle designed according to the invention, an emergency power supply is provided, which supplies electrical energy to at least the electrical control device, the electrically operable door locks and the restraint devices in the event that the onboard electrical system of the motor vehicle is disconnected due to an accident or in the event of a failure of the onboard electrical system in the motor vehicle. For example, such an emergency power supply can be formed by local current storage devices, which are preferably associated with the respective vehicle door and which store sufficient electrical energy for a predetermined period of time to unlock the electric door locks and trigger the associated restraint devices.

[0021] The principle of the invention is to combine the electric door presenter with an additional auxiliary drive which is separate from the electric tappet drive, i.e. redundant thereto, and has a mechanical energy accumulator (e.g. with a spring) or an energy accumulator designed as a pressure accumulator or a pyrotechnic energy accumulator. The spring-loaded mechanical door presenter tensions the spring with a force of approximately 1000 Newtons and keeps the spring permanently tensioned.

[0022] In the event of a crash, the energy storage device (e.g., a spring) is released via an electrical pulse when the door is opened. As a result, significantly less electrical energy must be stored in advance, which saves construction space, weight, and costs, since the electrical system only releases the energy stored in the energy storage device and does not have to generate this energy first. This also has the advantage that in the event of a crash, the door presenter remains extended and prevents the door from closing again. In addition, in normal operation, the electric door presenter can work with significantly less force and the electric tappet drive does not have to be designed for normal operation with higher forces (e.g., 1000 N).

[0023] This solution is also suitable for situations where the door is frozen. Here, the electric tappet drive can slightly slow down the mechanical force of the auxiliary drive so that the door does not open suddenly.

[0024] The described solution can also be used for vehicle access with power off, for example when the vehicle battery is empty. The solution can be implemented directly in the lock or as a separate component. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Preferred embodiments of the present invention together with additional implementation details and further advantages will be described and illustrated in more detail below with reference to the accompanying drawings.

[0026] In the figure:

[0027] Figure 1 A partially cutaway schematic diagram showing an automatic door opening device provided in a motor vehicle in a rest position;

[0028] Figure 2 Show Figure 1 The automatic door opening device in the vehicle is in the operating position during normal operation; and

[0029] Figure 3 Show Figure 1 The automatic door opening device in the emergency operation is in the operating position. DETAILED DESCRIPTION

[0030] Figure 1 A vertical cross-sectional view of a portion of a door 12 of a motor vehicle 1, which is formed around a door opening by the body 10 of the motor vehicle 1, and of a corresponding portion of a door frame 14 is shown. The door 12 is here in its closed position, in which the door inner wall 13 lies in the immediate vicinity of the door frame wall 11, so that a narrow air gap S1 is formed between the two. For the sake of clarity, the door seal which is usually provided is not shown here. The door 12 is delimited on its outer side by a door outer skin 15.

[0031] The automatic door opening device 2 is arranged in the interior of the vehicle door 12 as a component of the door opening mechanism. The automatic door opening device 2 has a housing 20, which is firmly connected to the structure of the vehicle door 12, for example, fixed on the door inner wall 13 with a housing end wall 20" facing the door inner wall 13.

[0032] A tappet 22 is provided in the interior of the housing 20 and is movable in its longitudinal direction (here in the vehicle transverse direction y). The reciprocating motion of the tappet 22 is Figure 1 The double arrow P in the figure symbolizes. The tappet 22 is driven by a tappet drive 24 arranged in the housing 20, which is formed by an electromagnetic drive 25 in the example shown, which is annular and the tappet 22 is inserted into the central opening 25' of the electromagnetic drive with a first end 22' pointing to the door outer skin 15 as an armature. Of course, other electric drives can also be provided instead of the electromagnetic drive, such as a worm driven by an electric motor, for the axial movement of the tappet 22. The tappet 22 passes through the housing opening 20' in the housing end wall 20'' and the opening 13' in the door inner wall 13 concentric therewith with its second end 22'' facing the door frame wall 11. In the example shown, the inner end face 22''' of the tappet 22 facing the door frame wall 11 is flush with the inner wall 13 and opposite to the door frame wall 11 in the static position of the automatic door opening device 2.

[0033] In the region of its second end 22 ″, the tappet 22 is provided with a circumferential collar 23 at a distance from the inner end face 22 ′″, the radius of which is greater than the radius of the tappet 22 , so that the circumferential collar 23 projects radially outwards beyond the circumferential wall of the tappet 22 .

[0034] On the side of the surrounding collar 23 facing away from the inner end face 22''', at least one restraining device 28 is provided in the interior of the housing 20, fixed to the housing peripheral wall 20''', and the restraining device is only schematically shown in the figure. The restraining device 28 has an annular restraining housing 28' firmly connected to the housing 20 and at least one restraining arm 28" which can move radially inwardly from the restraining housing 28' toward the tappet 22. Figures 1 to 3 In the example, two restraining arms 28" are shown, but there may be fewer or more restraining arms. Each restraining arm 28" can be moved, for example, by an electric motor or electromagnetic means. Figure 1 The radially inward position shown and the Figure 3 Movement between positions in the radially outward retraction restraint housing 28' is shown in FIG.

[0035] In the restraint arm 28" Figure 1 and Figure 2In the extended position shown, its radially inner free end 28''' is located in the immediate vicinity of the outer circumference of the tappet 22, but does not contact the tappet. Figure 1 The static position shown is also Figure 2 In the operating position shown in normal operation, a compressed spring 27 designed as a compression spring is arranged between the respective restraining arms 28 ″ of the respective restraining device 28, which is supported with its end on the body side against the restraining arm 28 ″ of the restraining device 28 and with its end facing away from the body against the annular housing inner wall 21 of the housing 20 through which the tappet 22 passes. The housing inner wall 21 simultaneously defines an installation space for an electromagnetic drive 25, which is located on the side of the annular housing inner wall 21 facing away from the spring 27. The spring 27 designed as a compression spring is therefore supported in its prestressed state between the annular housing inner wall 21 and the restraining arm 28 ″ of the restraining device 28.

[0036] In the interior of the housing 20, a locking device 30 of the safety mechanism 3 is provided between the restraining device 28 and the housing end wall 20" facing the door inner wall 13. The locking device 30 is configured to be comparable to the restraining device 28. The locking device - similar to the restraining device 28, has a surrounding annular locking housing 30' and at least one locking arm 30" that can be moved out and retracted from the locking housing 30' in a radial direction. Figures 1 to 3 In the example shown in FIG. 2 , two locking arms 30 are shown, but there may be fewer or more locking arms. Figure 1 The static position shown is also Figure 2 In the actuation position shown in normal operation, the locking arm 30 ″ is pulled radially outward into the annular locking housing 30 ′ and thus does not hinder the longitudinal mobility of the tappet 22 .

[0037] in accordance with Figure 2 The normal operation of the automatic door opening device 2 is described below, assuming that the associated door lock has previously been unlocked to such an extent or has been unlocked at the same time that the locking bolt can come out of the bolt of the door lock.

[0038] If the electrical contact transmitter 16 (e.g., a button or a sensor or a contact transmitter hidden behind the door outer skin 15 and activated without contact) arranged in the door outer skin 15 is operated during normal operation of the automatic door opening device 2, the operating signal is transmitted to the control device 4, which is only schematically shown in the figure, and the electromagnetic drive unit 25 of the tappet drive device 24 is charged with electrical energy from the onboard power supply 18 of the motor vehicle 1. Then, the tappet 22, which forms the armature of the electromagnet for the electromagnetic drive unit 25, is activated. Figure 2The push rod 22 moves to the right, i.e., toward the door frame wall 11. The second end 22'' of the push rod 22 here protrudes from the opening 13' of the door inner wall 13 and overcomes the gap S1, so that the end face 22''' of the push rod 22 abuts against the door frame wall 11. The push rod 22 moves to the right to such an extent that the surrounding shaft ring 23 abuts against the inner side of the annular housing end wall 20". Here, the vehicle door 12 is pressed away from the door frame wall 11 of the door frame 14 on the vehicle body side, wherein the gap S2 formed between the door inner wall 13 and the door frame wall 11 increases. Therefore, the gap S2 is larger than the gap S1. The vehicle door 12 that has been slightly pressed out of the door opening in this way can now be grasped from the outside at the edge of the door outer skin 15 from behind and the vehicle door 12 can thus be pulled from the outside into its open position. As shown from Figure 2 As can be seen in FIG. 2 , the spring 27 of the auxiliary drive 26 remains prestressed in its position between the annular housing inner wall 21 and the restraining arm 28 ″ of the restraining device 28 .

[0039] The following will be based on Figure 3 The emergency mode and overload mode of the automatic door opener 2 are described, wherein it is also assumed here that the associated door lock has previously been unlocked or is unlocked simultaneously to such an extent that the locking bolt can come out of the bolt of the door lock.

[0040] In emergency operation, i.e. when there is no or no longer enough electrical energy in the onboard power supply 18 to actuate the electromagnetic drive 25 of the tappet drive 24, because, for example, the onboard power supply 18 of the motor vehicle 1 has been disconnected after an accident or, for example, when the vehicle battery is discharged, the auxiliary drive 26 of the automatic door opener 2 is activated by emergency operation.

[0041] If the electrical contact transmitter 16 is actuated during emergency operation, the emergency power supply 40 (e.g., a battery or a supercapacitor) activated for a limited period of time, but at least for one hour, preferably for 24 hours, supplies electrical energy to the control device 4, the electric door lock and the restraint device 28, and the locking device 30 of the safety mechanism 3. In this case, when the electrical contact transmitter 16 is actuated, the restraint device 28 receives the restraint actuator activation signal from the control device 4 and then the actuator device (not shown) of the restraint device 28 pulls the restraint arm 28" radially outward into the annular restraint housing 28'. They thereby release the compressed spring 27, which then expands, comes to bear against the surrounding collar 23 of the tappet 22 and causes the tappet 22 (at Figures 1 to 3As in normal operation, the second end 22'' of the tappet 22 here protrudes from the opening 13' of the door inner wall 13 and overcomes the gap S1, so that the end face 22''' of the tappet 22 abuts against the door frame wall 11 and presses the vehicle door 12 away from the door frame wall 11 of the door frame 14 on the vehicle body side, as is also the case in normal operation under the influence of the electric tappet drive. In this way, also in emergency operation, the vehicle door 12, which was slightly pressed out of the door opening by the force of the spring 27 when the gap S1 increases to the gap S2, can now be grasped from the outside at the edge of the door outer skin 15 from behind and can thus be pulled from the outside into its open position.

[0042] In contrast to normal operation, the locking device 30 is now also charged with electrical energy, wherein the locking device 30 receives a locking actuator activation signal from the control device 4, whereupon an actuator device (not shown) of the locking device 30 moves the locking arm 30' radially inward out of the locking housing 30' and grips the surrounding collar 23 of the tappet 22 from behind at the annular end face 23'" of the surrounding collar 23 facing away from the tappet 22 and thereby prevents the tappet 22 from moving back into the housing 20. As a result, the vehicle door 12 cannot be retracted again. Figure 1 Shown in fully closed position.

[0043] In the case of overload, i.e. when the force of the electric tappet drive 24 is insufficient, in addition to supplying the electric tappet drive 24 with power from the onboard power supply 18 and activating the electric tappet drive 24, the restraining device 28 is also supplied with power and thereby activated, so as to additionally release the spring 27 of the mechanical auxiliary drive 26, which then moves the tappet 22 toward the door frame wall 11 and presses it against the door frame wall, as in the case of emergency operation, together with the force applied by the electric tappet drive 24. However, in the case of overload, the tappet 22 is not locked by the locking device 30. The tappet 22 remains free to move in the axial direction and can be pulled back again by the electric tappet drive 24, wherein the spring 27 is tensioned again and is fixed again in its tensioned position by the restraining device 28.

[0044] Even in the example described above where the automatic door opener 2 is arranged in the vehicle door 12 , it is just as well possible and also included in the present invention to arrange the automatic door opener 2 to be fixed to the vehicle body and to press the tappet 22 against the vehicle door 12 .

[0045] The invention is not limited to the mechanical energy accumulator formed by a compression spring as exemplified above, but a pneumatic or hydraulic energy accumulator may alternatively be provided as the energy accumulator for the separate auxiliary drive, or the auxiliary drive may be drivable by means of pyrotechnically generated pressurized gas.

[0046] The present invention is not limited to the above-described embodiment, which serves only to generally illustrate the core concept of the present invention. Rather, within the scope of the protection scope, the device according to the present invention may also adopt other designs than those described above. In this case, the device may in particular have features that constitute a combination of the individual features of the claims.

[0047] Reference signs in the claims, description and drawings serve only for a better understanding of the invention and shall not limit the scope of protection. Reference numerals list

[0048] 1Motor Vehicle

[0049] 2Automatic door opening device

[0050] 3. Security Agency

[0051] 4 Control device

[0052] 10 Body

[0053] 11 Door frame wall

[0054] 12 doors

[0055] 13. Inner wall of door

[0056] Opening in 13'13

[0057] 14 Door frame on the body side

[0058] 15 Door Skin

[0059] 16 electrical contact transmitter

[0060] 18 Vehicle Power Grid

[0061] 20 Shell

[0062] 20' shell opening

[0063] 20" shell end wall

[0064] 20''' Shell wall

[0065] 21 Shell inner wall

[0066] 22 Tappet

[0067] 22' First end

[0068] 22" Second end

[0069] 22''' end face

[0070] 23 surrounding collar

[0071] 23'23 annular end face

[0072] 24 Electric tappet drive device

[0073] 25 Electromagnetic drive

[0074] Central opening of 25'25

[0075] 26 Separate auxiliary drive

[0076] 27 Spring

[0077] 28 Restraint Devices

[0078] 28' restraint shell

[0079] 28" restraint arm

[0080] 30 Locking device

[0081] 30' Locking Housing

[0082] 30" Locking Arm

[0083] 40 Emergency Power Supply

[0084] S1 Small air gap

[0085] S2 Large air gap

Claims

1. An automatic door opening device, in particular an automatic door opening device for use in a motor vehicle, comprising: A housing (20), a tappet (22) mounted in the housing (20) so as to be longitudinally movable, and an electric tappet drive (24) designed to move the tappet (22) back and forth between a rest position retracted in the housing (20) and an actuated position out of the housing (20), In addition to the electric tappet drive (24), an auxiliary drive with an energy store is provided, which is prestressed in the actuated position. The invention is characterized in that an auxiliary drive (26) which is arranged separately from the electric tappet drive (24) is designed to be activated independently of the electric tappet drive (26) and when activated can move the tappet (22) from a rest position into an actuating position by releasing energy stored in an energy storage device.

2. The automatic door opening device according to claim 1, characterized in that: The electric tappet drive (24) has an electric or electromagnetic drive (25).

3. The automatic door opening device according to claim 1 or 2, characterized in that: The auxiliary drive (26) has a spring (27) or is formed by a spring which acts between the housing (20) and the tappet (22) and which, in the ready position, is in a prestressed state toward an actuating position of the tappet and is held in this prestressed state by a restraining device (28).

4. The automatic door opening device according to claim 3, characterized in that: The spring (27) is a compression spring.

5. The automatic door opening device according to claim 3 or 4, characterized in that: The restraining device (28) can be electrically triggered to release the spring (27).

6. The automatic door opening device according to any one of claims 3 to 5, characterized in that: The tappet drive (24) is designed to move the tappet (22) from an actuated position into a rest position against the force of a spring (27) when the auxiliary drive (26) is triggered and to secure the spring (27) in a preloaded state via a restraining device (28).

7. The automatic door opening device according to any one of the preceding claims, characterized in that A locking device (30) is provided, which is designed to lock the tappet (22) in the actuated position after being displaced into the actuated position by the activated auxiliary drive (26).

8. Motor vehicle (1) comprising a vehicle body (10) and at least one door (12) with an electrically actuable door lock and at least one automatic door opening device (2) according to one of the preceding claims, It is characterized in that The at least one automatic door opening device (2) is arranged in a force-effective manner between a vehicle door (12) and a door frame (14) on the vehicle body side or another component fixed to the vehicle body.

9. The motor vehicle according to claim 8, characterized in that An electric control device (4) is provided, which is designed to supply electric energy to an electrically actuatable door lock and a tappet drive (24) when an electric contact transmitter (16) is actuated, and the control device (4) is designed to unlock the electrically actuatable door lock and electrically or electromechanically trigger a restraint device (28) and thereby activate the auxiliary drive (26) when the electric contact transmitter (16) is actuated in the event of an overload of the tappet drive (24) or after receiving a crash signal representing a vehicle accident.

10. The motor vehicle according to claim 8 or 9, characterized in that: An emergency power supply (40) is provided, which supplies electrical energy to at least the electrical control device (4), the electrically operable door locks and the restraint device (28) when the onboard power supply of the motor vehicle (1) is disconnected due to an accident or when the onboard power supply of the motor vehicle (1) fails.

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