EP3980615A1

EP3980615A1 - Motor vehicle lock

Info

Publication number: EP3980615A1
Application number: EP20737338.2A
Authority: EP
Inventors: Christian Sturm
Original assignee: Kiekert AG
Current assignee: Kiekert AG
Priority date: 2019-06-06
Filing date: 2020-05-29
Publication date: 2022-04-13
Also published as: DE102019115273A1; WO2020244708A1

Abstract

The invention relates to a motor vehicle lock (10), in particular a motor vehicle lock that can be electrically operated, for a movable part (110) of a vehicle (100), comprising: a locking mechanism (20) which has at least one rotary latch (21) and at least one pawl (22) for blocking the rotary latch (21) in at least one latching position (I); an opening drive (30) which comprises at least one motor (31) and at least one transmission (32) for electromechanically unlocking the locking mechanism (20); and a load opening drive (40) for electromechanically unlocking the locking mechanism (20) in a load case, wherein the load opening drive (40) can be activated by a user from outside of the vehicle (100).

Description

Motor vehicle lock

description

The present invention relates to the field of motor vehicle locking systems and relates to a motor vehicle lock for a movable part of a vehicle having a locking mechanism with at least one rotary latch and a pawl for blocking the rotary latch in at least one latching position and an opening drive for electromechanical unlocking. The invention further relates to a method for unlocking in a load case and a motor vehicle with a motor vehicle lock according to the invention for a movable part.

Nowadays, for reasons of comfort, motor vehicle locksmiths are increasingly being equipped with electronics that enable the locks to be operated purely electronically. In the case of a motor vehicle lock with electrical opening, it is necessary to enable opening even with increased forces, as typically occur after accidents or when objects are trapped when closing the door. Furthermore, it must be possible to open the lock when the on-board voltage of the vehicle e.g. failed after an accident. The opening drive for the normal opening of the lock consists of a motor and a gear mechanism that acts on the pawl and must usually be able to open very quickly in order to ensure a valuable feel when the door is opened.

One problem with conventional motor vehicle locksmiths is that opening is not possible if the on-board network fails.

There is therefore a need for a motor vehicle lock, in particular an electrically operated motor vehicle lock with electrical redundancy to maintain the comfort as much as possible and at the same time ensure safety.

It is the object of the invention to at least partially remedy the above disadvantages known from the prior art. In particular, it is the object of the present invention to safely unlock the motor vehicle lock when it is loaded.

In addition, it is the object of the invention to provide a structurally simple and inexpensive solution for improving the motor vehicle lock.

The above object is achieved by a motor vehicle lock with the features of claim 1 and a method with the features of the independent method claim and a motor vehicle with the features of claim 10.

Further features, details, advantageous developments and improvements of the invention emerge from the subclaims, the description and the drawings. The features described in the patent claims, the description, the drawings and the subclaims can be combined or varied with one another in any technologically sensible manner and show further embodiments of the invention. It should be noted that the exemplary embodiments described below to explain the Invention are not limiting. Features and details that have been described in connection with the motor vehicle lock according to the invention naturally also apply in connection with the method according to the invention and / or the motor vehicle according to the invention and in each case vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is always made to each other or . can be.

According to the invention, the motor vehicle lock for a movable part of a vehicle has a locking mechanism with at least one rotary latch and at least one pawl for blocking the rotary latch in at least one latching position, as well as an opening drive. The motor vehicle lock also includes at least one Motor and at least one gearbox for electromechanical unlocking of the locking mechanism. Furthermore, a load opening drive is provided, which is provided for electro-mechanical unlocking of the locking mechanism in a load case, the load opening drive being able to be activated by a user at least from outside the vehicle. Actuation from the interior of the vehicle is also conceivable. In particular, according to the invention, it is an electrically operated motor vehicle lock. This means in particular that the motor vehicle lock can be actuated and / or driven electrically. This can be understood to mean motor vehicle fitters who have at least one drive motor for actuating the locking mechanism. Such locks can be operated electronically and / or electromechanically and / or mechanically. In this case, for example, a purely electrical actuation of the motor vehicle lock can be activated by means of an ID transmitter carried by the user. In addition, it is conceivable that the motor vehicle lock is acted upon mechanically with a force, for example via a handle, for example in the form of an outside door handle, so that the locking mechanism can be unlocked. According to the invention, an opening drive is provided which can lift the locking mechanism, in particular the at least one pawl, out of the locking position in which the rotary latch is blocked. For this purpose it is conceivable, for example, that the opening drive acts on a release lever, a release wheel or a motor-driven cable pull. In addition, it is conceivable within the scope of the invention that the opening drive acts directly on the at least one pawl. For this purpose, the opening drive has a motor with at least one gear, which can transmit a force to the locking mechanism, so that it can be unlocked and / or locked.

According to the invention, a load opening drive is also provided, which can be activated by a user from outside the vehicle, the load opening drive enabling the locking mechanism to be unlocked and / or locked. Within the scope of the invention, a load case is intended to include, for example, an emergency, that is to say an accident of the vehicle or a trapping of the door of the motor vehicle. Accordingly, the load case covers application situations in which a higher load acts on the locking mechanism, so that unlocking the locking mechanism is difficult or cannot be achieved for the conventional opening drive.

Compared to the prior art, the load opening drive according to the invention enables access to the vehicle to be made possible by unlocking the motor vehicle lock even with increased forces necessary to unlock the locking mechanism, which typically occurs after accidents or when objects are trapped when closing the door. Accordingly, a load opening drive according to the invention enables the lock to be opened / unlocked whenever an increased force or an increased opening moment has to be made available.

If, within the scope of the invention, a motor vehicle lock for a moving part is referred to as a motor vehicle, this should be understood to mean at least side door locks, wing door locks, swing doors, rear door locks, trunk lid locks and hood locks or hood locks. These all fall under the generic term motor vehicle lock.

Motor vehicle mechanics can have several locking positions. For example, a motor vehicle lock according to the invention can have at least one pre-locking position and one main locking position as well as an opened / unlocked position. In addition, generic motor vehicle locksmiths can have at least one lock housing, a lock cover and a lock case (subsumed under the term lock housing in the following), the locking mechanism thus being essentially enclosed / closed by the lock housing.

In the context of the invention, at least one energy source can be provided, the energy source being designed in particular as a battery or supercapacitor and serving to supply energy to the opening drive and / or the load opening drive. It is particularly preferred if the energy source, in particular in the form of a battery or a supercapacitor, is kept constantly or at least temporarily in the charged state during normal operation of the motor vehicle. So can it is ensured that in the case of load, sufficient energy can be made available to supply the opening drive and / or load opening drive with electrical energy. Supercapacitors, also called ultracapacitors, are electrochemical capacitors and have an increased power density compared to commercially available accumulators, so that they can be charged much faster.

A switching means, in particular a mechanical circuit breaker, is advantageously provided for activating the load opening drive, the switching means being able to be arranged at a location on the movable part that the user can reach outside the vehicle. By means of the switching means according to the invention, which is designed in particular as a mechanical power switch, it is thus possible for a user to operate the at least the load opening drive from outside the vehicle in a load case. Thus, for example in the event of a trapping or after an accident of the motor vehicle, a user can unlock the door from the outside so that access to the interior of the vehicle is made possible. In particular in connection with the energy source according to the invention, access to the vehicle can thus be made possible after a failure of the on-board network / the vehicle's energy supply. The energy source can provide the correspondingly required electrical energy for the load opening drive as soon as a user activates the switching means after a load case has been recognized.

It is conceivable that the switching means is arranged on a handle or in the area of a handle of the movable part of the motor vehicle. It is also conceivable that the circuit breaker / the switching means is integrated into the handle. The handle can be designed, for example, in the form of an outside door handle, so that a user outside the vehicle can operate the outside door handle and thus trigger the switching means, which leads to the activation of the load opening drive. In this way, intuitive activation of the load opening drive can be made available, in particular after an accident with the vehicle. For the user, nothing changes in handling to operate the motor vehicle lock compared to a conventional actuation system for a motor vehicle lock. If an accident or a trapping is detected and a user operates the switching means from outside the vehicle, the load opening drive can be activated so that the load opening drive enables the locking mechanism to be unlocked electromechanically. It is also conceivable that the switching means, in particular the mechanical circuit breaker, is arranged in an area on the movable part or at another point on the vehicle body that is accessible to a user outside the vehicle. This can be in the area of the A, B or C pillar, for example.

In the context of the invention, the load opening drive can comprise a load opening gear, the gear ratio of the load opening gear being greater than the gear ratio of the gear of the opening drive. This means that the motor vehicle lock according to the invention has a second gear in addition to the gear of the opening drive, this load opening gear being designed for opening under high loads. According to the invention, the load opening drive can have a separate load opening motor. The load opening motor interacts with the load opening gear, the load opening gear having a greater gear ratio than the gear of the opening drive. An opening drive usually has a gear ratio that aims to open the door quickly in order to ensure a high-quality feel when the door is opened. However, this implies that forces cannot be achieved that are sufficiently large to enable opening under high loads, for example in the event of a trapping or after an accident. The load opening drive, which is provided according to the invention, can thus also open the lock when very large loads act on the locking mechanism.

It can be advantageous if the load opening drive, in particular the load opening gear, is in operative connection with the motor of the opening drive so that the load opening gear can be driven by the motor of the opening drive. Accordingly, only one motor is required for “normal opening” and opening under load. The load opening drive is arranged in the motor vehicle lock in such a way that it is in operative connection with the motor of the opening drive. This means that the output shaft of the motor is connected to the opening drive and to the load opening drive, in particular to the load opening gear of the load opening drive. This mechanical operative connection enables the opening drive to apply a force or a torque to the load opening gear so that the motor can unlock the lock even at high loads with the interposition of the load opening gear. By using only one opening motor, installation space and component costs can be reduced.

Furthermore, it can be advantageous that the gear of the opening drive or the load opening gear can be driven as a function of the direction of rotation of the motor of the opening drive. This development thus makes it possible that, depending on the direction of rotation of the motor of the opening drive, either the gear of the opening drive, which has a small gear ratio, is driven or that, in the case of an opposite direction of rotation of the motor or the output shaft of the motor, the gear of the load opening gear is driven with a higher Translation is driven so that the lock can be unlocked under heavy loads. This enables the motor vehicle lock to be designed in a simple manner, since both “normal” opening and opening under greater load are made possible only by energizing or controlling the motor of the opening drive. As a result, installation space in the motor vehicle lock can be saved.

Within the scope of the invention, the load opening drive can have a separate load opening motor for driving the load opening gear, the load opening motor being connected to the energy source and thus being able to be supplied with electrical energy. Accordingly, by means of the electrical energy of the energy source, the load opening motor can drive the load opening gear and unlock the lock even under high loads. This separate motor for the load opening drive case is optimized according to the invention so that it can be operated with low electrical power and at the same time provides sufficient power to open the locking mechanism under load. This is done, in particular by means of the load release gear and, for example, the motor winding of the Load opening engine achieved. With the appropriate selection of the gear ratio of the load opening gear and the motor winding of the load opening motor, high forces can be achieved even with low electrical powers. As a result, the electrical energy supply, ie the electrical energy source, can be carried out inexpensively.

According to the invention, the load opening drive can be signal-connected to a control unit, the control unit cooperating with a detection unit so that the load opening drive can be activated in the event of a collision detection or jamming. For this purpose, according to the invention, the control unit is advantageously designed with a circuit / switch which only allows activation of the load opening drive in the event of a collision. The switch in the control device is advantageously permanently open, so that emergency opening is prevented in normal operation. Only when a load case is detected, for example an accident or a trapping of the moving part, does the control device close the switch it contains. This takes place immediately after the detection unit has detected a load case, for example an accident or a trapping case, before the on-board power supply fails, for example as a result of the battery being torn down. By operating the switching means from outside the vehicle, the door can now be opened from the outside, the necessary electrical energy being taken from the energy source.

If an object is trapped when the door is closed, a higher force acts on the lock, which can result in the opening drive not working for normal opening. If this is recognized by the recognition unit, the switch contained in the control is closed so that the operator can open the door from outside the vehicle with the aid of the switching means.

A control unit for carrying out a method of personal protection means for a vehicle (e.g. an airbag control device) or a door-related or lock-related control unit with an interface to a control unit of the personal protection means or e.g. a Environment sensor, shown because it is real-time capable and, thanks to its design, meets the highest demands, for example in terms of robustness, availability, etc. It is also conceivable that

For this purpose, the control unit can have at least one processing unit for processing signals or data, at least one memory unit for storing signals or data, at least one interface to a sensor, a detection unit or an actuator for reading in sensor signals from the sensor or for outputting data or data Control signals to the actuator and / or at least one communication interface for reading in or outputting data, which are embedded in a communication protocol. The computing unit can be, for example, a signal processor, a microcontroller or the like, wherein the storage unit can be a flash memory, an EEPROM or a magnetic storage unit. The communication interface can be designed to read in or output data wirelessly and / or wired, with a communication interface that can input or output wired data, for example, feed this data electrically or optically from a corresponding data transmission line or output it into a corresponding data transmission line.

For this purpose, at least one sensor signal is advantageously received by at least one detection unit, for example an environment sensor or an airbag control of the vehicle. An environment sensor is a sensor system / sensor that includes environment information, such as information from radar and / or lidar systems, for example, as well as vehicle dynamics information in order to achieve an optimal protective function for the occupant in the event of a collision. Depending on the function, optimal means that a very fast reaction time for triggering / activating safety systems is made possible. In the present case, an environment sensor should also be understood to mean a sensor or a plurality of sensors that detect physical effects in the environment or on the vehicle itself. This also includes video and / or ultrasonic sensors. These Systems are also known from the prior art under the term pre-crash systems.

If an environmental sensor now reports that a collision is imminent or that a collision has already occurred, the control unit according to the invention can be activated in response to the received sensor signal.

Furthermore, it is conceivable that, in addition to an environment sensor, at least one crash sensor of the vehicle supplies the sensor signal or an additional sensor signal to the environment sensor. Accordingly, the crash sensor can detect a crash / collision that has already been initiated or carried out and can supply additional sensor signals for activating the closing module.

The environment sensor and / or the crash sensor can be arranged in the host vehicle or in another vehicle involved in a collision.

Accordingly, different vehicles involved in the collision can communicate with one another according to the invention, so that the signals of the

Environment sensors or crash sensors enable redundant signal processing. This ensures that the

Load opening drive is completed.

It is also advantageous if the environment sensor provides collision information for a possible collision of the vehicle. The environment sensor can thus provide a collision prognosis and trigger the control unit before a collision of the vehicle with another vehicle or the environment occurs, thus enabling the load opening drive. Such a collision prediction makes it possible that even before a force acts as a result of a collision, the

To release the load opening drive so that only the switching means must be actuated from outside the vehicle so that the load opening drive unlocks the lock. As a result, forces acting in the motor vehicle lock as a result of an accident can have a less negative impact on the functions of the motor vehicle lock. The collision information provided by the environment sensor can be in Dependency of the vehicle speed or vehicle acceleration as well as the detected distances to another vehicle or the surroundings, which are possible for a collision. Accordingly, the collision information can also consist of vehicle dynamics information, radar, lidar, ultrasound or video sensors. On the basis of the collision information, a collision prognosis can thus be created, the collision prognosis also being designed in such a way that activation is not carried out if it is predicted that a collision is not sufficiently strong that the locking mechanism / the locking mechanism will be affected. In this way, a malfunction or a false activation / misuse can be reduced.

The control unit according to the invention, which is in signal connection with a detection unit and the switching means according to the invention, which is at least accessible from outside the vehicle, thus provides a motor vehicle lock which only activates the load opening drive when the load case is detected and the switching means is actuated by a user can be. The security and convenience for the motor vehicle lock are thus considerably increased.

According to a further aspect of the invention, a load opening method for the electromechanical unlocking of an electrically operated motor vehicle lock is claimed. The electrically operated motor vehicle lock is preferably designed according to the claimed motor vehicle lock. The method according to the invention has at least the following steps:

- Detection of a load case, in particular a vehicle collision or a trapping case by a detection unit,

- actuation of a switching means by a user of the motor vehicle,

- Actuation of the load opening drive by the control unit and thus

- Unlocking the locking mechanism by the load opening drive, whereby the moving part can be opened. The method steps, processes and operations described here are not to be regarded as necessarily requiring their implementation in the particular order discussed or illustrated, unless this is specified as an order of implementation. The method steps can run at least partially simultaneously or one after the other, the sequence of the method steps not being limited to the sequence defined by the list, so that individual steps can be carried out in different sequences.

For the load opening method according to the invention, there are all the advantages that have already been explained in connection with the motor vehicle lock according to the invention.

According to a further aspect of the invention, a motor vehicle with at least one movable part, in particular a door, sliding door, flap, tailgate or front flap is claimed. The movable part is assigned a motor vehicle lock, as it is claimed and can be designed within the scope of the finding. In addition, at least one switching means is arranged on the movable part, the switching means being actuatable from outside the motor vehicle so that the motor vehicle lock can release the moving part when a user actuates the switching means and a load case has been recognized, in particular by the detection unit.

In addition, it should be pointed out that “comprising” and “having” do not exclude any other elements or steps and that “a” or “an” does not exclude a plurality. It should also be pointed out that features or steps that have been described with reference to one of the above exemplary embodiments can also be used in combination with other features or steps of other exemplary embodiments described above. Reference signs in the claims are not to be regarded as restrictions. If an exemplary embodiment comprises an “and / or” link between a first feature and a second feature, this should be read in such a way that the exemplary embodiment according to one embodiment has both the first feature and the second feature and, according to a further embodiment, either only the has the first feature or only the second feature.

Further measures improving the invention emerge from the following description of some exemplary embodiments of the invention, which are shown schematically in the figures. It should be noted that the figures are only of a descriptive character and are not intended to restrict the invention in any way. There are thus also embodiments to be regarded as encompassed and disclosed by the invention, which are not explicitly shown or explained in the figures, but emerge from the explained embodiments and can be generated by separate combinations of features. In the figures, the same reference symbols denote the same or functionally identical components, unless stated otherwise.

Show it:

1 schematically shows a possible embodiment of a motor vehicle lock according to the invention,

Fig. 2 is a more detailed view of the embodiment shown in Fig. 1 and

3 shows a possible embodiment of a motor vehicle according to the invention.

Fig. 1 shows a possible embodiment of the motor vehicle lock 10 according to the invention as well as a possible switching means 42, a control unit 15 and a recognition unit 60. The motor vehicle lock 10 is shown schematically in FIG an energy source 41. The opening drive 30 is operatively connected to the locking mechanism 20, so that the opening drive 30 also engages the locking mechanism 20 a force or a moment can be applied so that this can be unlocked or locked. The locking mechanism 20 is also in operative connection with the load opening drive 40. This is also designed at least in such a way that the locking mechanism 20 can be locked and / or unlocked. The energy source 41 is connected in terms of energy to the opening drive 30 and the load opening drive 40, so that the energy source 41 can supply the load opening drive 40 and / or the opening drive 30 with electrical energy.

The energy source 41 can be connected via the control unit 50, which is advantageously connected to the energy supply of the motor vehicle, so that it is charged during normal operation. Accordingly, in normal operation of the motor vehicle, i. H. if no jamming or accident was detected, the energy source 41 can be charged or kept in the charged state.

The control unit 50 has a switch which, as shown in FIG. 1, is open in regular operation, so that the load opening drive 40 is deactivated in the normal case. The control unit 50 is signal-connected to the recognition unit 60. This means that when the detection unit 60 detects an accident and / or trapping, the switch of the control unit 50 is closed. The control unit 50 is also signal-connected to the switching means 42. The switching means 42 is also not actuated in normal operation and is therefore in an open state, so that the switch is closed only after the switching means 42 has been actuated by a user, in particular from outside the vehicle. As can be seen in the figure, the switching means 42, the energy source 41 and the load opening drive 40 are connected in series. Accordingly, the load opening drive 40 can only be activated when the control unit 50 receives a signal from the detection unit 60 that there is a load case, so that the switch of the control unit 50 is closed. The load opening drive is only activated when the switch of the switching means 42 is also actuated and a user of the vehicle makes an opening request. This means that only when the switches of the control unit 50 and the switching means 42 are actuated, the load opening drive 40 does Lock 20 can unlock. Misuse of the load opening drive 40 is thus prevented.

The switching means 42 is preferably designed as a mechanical power switch. Thus, in contrast to a contact or proximity sensor, it can connect the energy source 41 directly to the load opening drive 40 even if the vehicle electrical system fails. The electrical switching means arranged on the outer surface of the movable part is accordingly suitable for switching the current necessary to open the load directly.

FIG. 2 shows the exemplary embodiment from FIG. 1 in more detail. Accordingly, it can be seen from FIG. 2 that the locking mechanism 20 has a rotary latch 21 and a pawl 22. The opening drive 30 has a motor 31 and a gear 32, the gear 32 having a translation ii. The opening drive 30 is functionally connected to the locking mechanism 20 so that the opening drive, in particular the gear 32 of the opening drive 30, acts on the pawl 22 of the locking mechanism 20, so that the pawl 22 can be lifted out of the locking position and the rotary latch 21 is released. It is also conceivable that the opening drive can be actuated for locking so that the pawl 22 can be pivoted into the locking position. The load opening drive 40 is also operatively connected to the locking mechanism 20, in particular the locking pawl 22. The load opening drive 40 has a load opening motor 44 and a load opening gear 43, the load opening gear 43 having a transmission. According to the invention, it is now provided that the gear ratio ii of the opening drive 30, and thus of the gear 32, is smaller than the gear ratio of the load opening gear 43. This allows greater forces on the locking mechanism via the load opening drive 40 due to the greater gear ratio of the load opening gear 43 20, in particular the pawl 22, can be exercised so that higher forces can be made available for unlocking in the event of a load. The load opening drive 40 and the opening drive 30 are connected to the energy source 41, so that electrical energy can be transmitted from the energy source 41 both to the load opening drive 40 and to the opening drive 30.

FIG. 3 shows a possible exemplary embodiment of a motor vehicle 100 according to the invention. The motor vehicle 100 has, for example, moving parts 110, on the one hand a front hood 110 and a side door 110 of the motor vehicle being shown. A motor vehicle lock 10 is assigned to each of the moving parts. Furthermore, the motor vehicle 100 has a recognition unit 60 and a control unit 50, the control unit 50 being in signal connection with the recognition unit 60. Furthermore, the control unit 50 is signal-connected to the motor vehicle lock 10 and the switching means 42.

List of reference symbols

10 motor vehicle lock

20 lock

21 rotary latch

22 pawl

30 opening drive

31 engine

32 transmission

40 Load opening drive

41 Energy source

42 switching means

43 Load opening gear

44 Load opening motor

50 control unit

60 recognition unit

100 motor vehicle

1 10 moving part

11 Gear ratio 30

12 Transmission of load opening gear 43

Claims

1. Motor vehicle lock (10), in particular electrically operated motor vehicle lock, for a movable part (1 10) of a vehicle (100), comprising a locking mechanism (20) with at least one rotary latch (21) and at least one pawl (22) for blocking the rotary latch (21) in at least one latching position (I), an opening drive (30) comprising at least one motor

(31) and at least one gear (32) for electro-mechanical unlocking of the locking mechanism (20), further comprising a load opening drive (40) for electromechanical unlocking of the locking mechanism (20) in a load case, the load opening drive (40) by a User can be activated from at least outside the vehicle (100).

2. Motor vehicle lock (10) according to the preceding claim, characterized in that at least one energy source (41) is provided, in particular a battery or a super capacitor, for supplying energy to the opening drive (30) and / or the load opening drive (40).

3. Motor vehicle lock (10) according to one of the preceding claims, characterized in that a switching means (42), in particular a mechanical circuit breaker, is provided for activating the load opening drive (40), the switching means (42) being connected to a user outside the vehicle (100) accessible point of the movable part (1 10) can be arranged.

4. Motor vehicle lock (10) according to one of the preceding claims, characterized in that the load opening drive (40) is a

Load opening gear (43) comprises, the translation (12) of the

Load opening gear (43) is greater than the translation (11) of the gear

(32) of the opening drive (30). 5. Motor vehicle lock (10) according to the preceding claim, characterized in that the load opening drive (40) is in operative connection with the motor (31) of the opening drive (30) so that the load opening gear (43) can be driven by the motor (31).

6. Motor vehicle lock (10) according to one of the preceding claims, characterized in that the gear (32) of the opening drive (30) or the load opening gear (43) can be driven as a function of the direction of rotation of the motor (31).

7. Motor vehicle lock (10) according to one of the preceding claims, characterized in that the load opening drive (40) has a separate load opening motor (44) for driving the load opening gear (43), the load opening motor (44) being connected to the energy source (41) and can thereby be supplied with electrical energy.

8. Motor vehicle lock (10) according to one of the preceding claims, characterized in that the load opening drive (40) with a

Control unit (50) is signal-connected and the control unit (50) interacts with a detection unit (60) so that the load opening drive (40) can be activated in the event of a load detection by the detection unit (60).

9. Load opening method for the electro-mechanical unlocking of an electrically operated motor vehicle lock (10), in particular with the features of one of the preceding claims, comprising the steps:

- Detection of a load case, in particular a vehicle collision, by a detection unit (60),

- Actuation of a switching means (42) by a user of the vehicle

(100),

- Actuation of the load opening drive (40) by the control unit (50),

- Unlocking the locking mechanism (20) by the load opening drive (40), whereby the movable part (110) can be opened. 10. Motor vehicle (100) with at least one movable part (1 10), in particular a door, sliding door, flap, tailgate or front flap, with a motor vehicle lock (10) assigned to the movable part, in particular according to one of claims 1 to 8, and a switching means (42) arranged on the movable part (1 10), the switching means (42) being actuatable from outside the motor vehicle (100) so that the motor vehicle lock (10) can release the movable part (1 10) when a user uses the switching means (42) actuated and a load case was recognized.