FR2800784A1 - DEVICE FOR CONTROLLING A LOCKING MECHANISM OF A VEHICLE DOOR - Google Patents

Abstract

The present invention relates to a device for controlling a mechanism for locking a door of a practical, safe and improved vehicle, not requiring a permanent access zone to the manual actuating member, and making it possible to improve the aesthetics and aerodynamics of the door. This control device (100) is characterized in that said manual actuating member (12) comprises a handle (12a) movable between a rest position, in which a user cannot grasp the handle, and a position of use, in which a user can grasp the handle to bring it into an actuated position allowing the door to be unlocked. The handle (12a) comprises a rod (12b) slidably mounted in a transmission support (14), itself slidably mounted in a fixed guide rail (19). This support (14) is controlled in movement by a rack (16), a gear train (20) and a motor (26). The control device (100) comprises a push button (29) operable by the user, superimposed on the handle (12a) and cooperating with a switch (31) to transmit to the motor (26) an electrical signal for request for use. of the handle (12a).

Description

DEVICE FOR CONTROLLING A LOCKING MECHANISM

OF A DOOR OF A VEHICLE

  The present invention relates to a device for controlling a mechanism for locking a door of a vehicle, the control device being mounted in a housing formed in said door and comprising a manual actuation member, disposed on the side corresponding to an exterior surface of the door, this manual actuating member being coupled to said locking mechanism so as to unlock it manually

  io from outside the vehicle.

  Control devices of the type as described above are commonly used in the automotive field. Typically, the manual actuator comprises a pivoting handle or a lever, of the "trigger" type, pivotally mounted on a fixed support. The handle protrudes from the outer wall of the door or is arranged opposite a recess in this wall, this in order to define an access area, between the handle and the wall, which allows a user to spend his

fingers to operate the handle.

  The prior art control devices have various drawbacks. The access area required to operate the handle creates an aesthetic constraint. The stylist is forced to choose either one

  protruding handle is obviously in the outer wall of the door.

  This is a major drawback as we know the importance given to the style of a road vehicle, and in particular a car. A protruding handle can be dangerous. In addition, the presence of a protruding part or a recess generates, beyond a certain speed, disturbances in the air flow on the door, slightly affecting the aerodynamics of the

vehicle.

  The object of the present invention is to overcome these various drawbacks by providing a device for controlling a mechanism for locking a door of a practical, safe and improved vehicle, which does not require a permanent access area to the manual actuator, and allowing

  improve the aesthetics and aerodynamics of the door.

  This object is achieved by a control device as described in the preamble, characterized in that said manual actuation member comprises a handle movable between a rest position, in which said handle and said exterior surface of the door are substantially in the same plane so that a user cannot grasp the handle, and a position of use, in which said handle is spaced from said surface

  outside of the door so that a user can grasp the handle.

  In the rest position, the handle is advantageously retracted into said housing of the door to be flush with said exterior surface of this door. Preferably, the handle is coupled to the locking mechanism of the door so that it does not unlock this locking mechanism between said rest position and said position of use and so that, when the handle is actuated manually by a user of said position of use in an actuated position, it unlocks said door locking mechanism, the handle being further apart from the exterior surface of the door in said actuated position than it is in said position of use. In a manual embodiment variant of the invention, the handle is moved from its rest position to its use position under the effect of manual pressure exerted by the user on this handle in the rest position. In this variant, the control device may include a handle support mounted in the housing of the door and provided with an axis on which the handle is pivotally mounted, this axis being disposed approximately in a central region of the handle and separating it into two wings so that a simple torque can be applied

  manual pressure on at least one of the wings.

  In this alternative embodiment, the control device advantageously comprises at least one return member cooperating with the handle and the handle support, arranged to urge the handle towards its rest position. Preferably, this control device comprises braking means arranged to slow down and dampen the pivoting of the handle around its axis, these braking means comprising for example at least one damper. In accordance with this variant embodiment, the control device may also include at least one end-of-travel member mounted on said support and arranged to act as a stop for the handle in the actuated position and

  generate a corresponding electrical signal.

  In an alternative motorized embodiment of the invention, the control device may include a control mechanism coupled to said handle and arranged to drive in displacement in a predetermined manner

  said handle between said rest position and said use position.

  The control mechanism advantageously comprises a guide rail mounted in the housing and rigidly connected to the door as well as a transmission support coupled to the handle and arranged to slide in said guide rail, and said transmission support comprises a rack coupled to a drive shaft of a drive motor by a power transmission assembly so that the drive motor moves the transmission support in the guide rail in movement so as to move said handle between said position

  of rest and said position of use.

  In this alternative embodiment, the guide rail and the transmission support each have complementary forms of guide arranged to limit the travel of the transmission support relative to the rail.

guide.

  In this embodiment, the handle advantageously comprises a handle rod arranged to slide in a groove made in the transmission support so that the handle can be moved

  manually between the operating position and the actuated position.

  The control device may include return means arranged

  to urge the handle rod towards the inside of said groove.

  In order to limit the overall dimensions, the guide rail, the transmission support and the handle rod are curved longitudinally

  substantially in the shape of an arc of a circle.

  In the motorized embodiment, the control device comprises a control system arranged to transmit predetermined control signals to said control mechanism, this control system being able to comprise at least detection means, timers and a electronic block arranged to generate

said control signals.

  Preferably, said servo system comprises a user request member arranged to be actuated by a user from outside the vehicle and generate a user request signal for

  the handle towards said control mechanism.

  io This use request member advantageously comprises a flange resiliently coupled to said handle and arranged to cooperate with a

  switch mounted on said handle to form a push button.

  The servo-control system can be arranged to operate in conjunction with a vehicle interior control unit which transmits control signals representative of the state of the door locking mechanism, condemned and non-condemned states, to condemn

  and unlocking said control mechanism.

  However, the servo system can also include a separate electronic control unit arranged to lock and unlock

said control mechanism.

  The present invention and its advantages will appear better in the

  following description of two embodiments of the invention, with reference

  in the accompanying drawings in which: - Figure 1 is a side elevational view of an alternative embodiment of the manual control device of the invention, illustrating the rest position of the manual actuator; - Figure 2 is a side elevational view of the control device of Figure 1, illustrating the position of use of the actuator; - Figure 3 is a side elevational view of the control device of Figure 1, illustrating the actuated position of the actuator; - Figure 4 is a front view of the support alone of the control device of Figure 1; - Figure 5 is an exploded perspective view of a motorized alternative embodiment of the control device of the present invention; - Figure 6a is a side elevational view of the control device of Figure 5, illustrating the rest position of the manual actuator; - Figure 6b is a schematic perspective view illustrating the actuator in the rest position on a side door of a road vehicle; - Figure 7 is a side elevational view of the control device of Figure 5, illustrating the impulse of a user on the push button requesting use of the actuating member; - Figure 8a is a side elevational view of the control device of Figure 5, illustrating the position of use of the actuator; - Figure 8b is a schematic perspective view illustrating the actuator in the use position on the side door of the vehicle; and - Figure 9 is a side elevational view of the control device of the

  Figure 5, illustrating the actuated position of the actuator.

  The control device of the present invention makes it possible to unlock a mechanism for locking a door of a vehicle, in particular of a road vehicle, from outside the vehicle. This control device is adapted to a mechanism for locking a side door of the passenger compartment, the door or the tailgate of the boot, or the hood of the vehicle. The locking mechanism (not shown in the figures) is a conventional mechanism which comprises a lock, such as a mechanical or electric lock, and a keeper, known to those skilled in the art. The lock is secured to the door

  and the keeper is integral with bodywork elements of the vehicle for example.

  Referring to the figures, the control device 10, 100 is mounted in a housing 1a, 1 formed in the door 1, 1 1 of the vehicle. It includes a manual actuator 2, 12, such as a handle 2a, 12a, on the side corresponding to the exterior surface 1b, 11b of the door. The handle 2a, 12a is coupled to the lock of the locking mechanism so as to unlock it in particular by means of a cable or a switch, by

  o example, depending on whether the lock is mechanical or electrical.

  The handle 2a, 12a is movable between a rest position, illustrated by Figures 1 and 6a and 6b, and a position of use, illustrated by Figures 2 and 8a and 8b. In the rest position, the handle 2a, 12a and the outer surface 1b, 11b of the door 1, 11 are substantially contiguous so that a user cannot grasp the handle. This is flush with the outer surface 1b, 11b and has returned to the housing 1a, 11a of the door for example. In the position of use, the handle 2a, 12a is spaced from the outer surface l b, 11b so that the user can grasp it. Between these two positions of rest and use, the handle 2a, 12a does not unlock

the lock.

  The control device can be a manual device 10 as illustrated by FIGS. 1 to 4 or a motorized device 100 as illustrated by the

Figures 5 to 9.

  In the manual embodiment variant, the control device 10 comprises a handle support 3 mounted in the bottom of the housing 1a of the door 1o by two fixing screws 4a and 4b. The handle 2a is pivotally mounted around a fixed axis 5 supported by the support 3, in two end zones forming bearings. This axis 5 is disposed substantially in a median zone of the handle 2a separating it into two wings so as to be able to apply a torque by simple manual pressure on one of the wings to urge the handle 2a in the use position (cf. Fig. 2). A return member 6 in the form of a torsion spring having two free ends 6a, 6b is mounted around the axis 5. One of its ends 6a bears on the support 3 and the other end 6b takes support on handle 2a to urge it into the rest position (see fig. 1). In this position, the handle 2a o rests on a support surface of the support 3 which serves as an end stop

resting race.

  This control device 10 also includes braking means 7 arranged to slow down and dampen the pivoting of the handle. These means are provided with at least one grease damper 7a secured for example to the handle 2a meshing with a toothed pinion 7b secured to the support 3. Good

  heard any other equivalent braking device may be suitable.

  An end of travel member 8 is also provided on the support 3 to serve as a stop for the handle 2a in the actuated position (cf. FIG. 3) and generate a corresponding electrical control signal, arranged for example for

  unlock the door lock if it is electric.

  In the case where the lock of the locking mechanism is mechanical, the handle 2a is coupled to the lock by means of a connecting element such as a cable for example so that the handle unlocks the lock between

  the position of use and the position actuated by the travel of the cable.

  This manual control device 10 is very simple to use. When the user wants to unlock the door 1 of his vehicle, he exerts manual pressure, for example on the upper wing of the handle 2a to rotate it around its axis 5 to its position of use (cf. Fig. 2) so as to separate the lower wing of the handle 2a from the outer surface 1b of the door. Then, the user runs his fingers behind the lower wing of the handle 2a and rotates it around its axis 5 to its actuated position (see fig. 3). In this actuated position, the upper wing of the handle 2a is in abutment against the end of travel member 8 which generates the control signal to unlock the door lock. After unlocking the door 1, the user releases the handle 2a which returns to the rest position under the action of the torsion spring 6. The pivoting of the handle 2a is damped and braked automatically by the grease damper

  7a in engagement with the toothed pinion 7b.

  In the motorized variant embodiment, the control device 100 2.5 comprises a control mechanism 13 coupled to the handle 12a, which controls its movement between its rest position and its use position. In the embodiment described here, by way of example only, the actuating member 12 comprises the handle 12a, which is integral with a handle rod 12b. This rod 12b has an approximately T-shaped cross section for example. The control mechanism 13 comprises a transmission support 14 comprising a longitudinal groove 15 whose shape is approximately complementary to the shape of the handle rod 12b. The rod 12b is housed in this groove 15 and is arranged to slide therein. The handle rod 12b is held in position in the groove 15 by return or pushing means for example, arranged to urge the handle 12a towards the

transmission medium 14.

  The transmission support 14 has an approximately rectangular exterior profile. It has on its upper face teeth 16 arranged transversely, substantially over its entire length for example and forming

a rack.

  The control mechanism 13 comprises a body 17 rigidly connected to the door 11, by a fixing flange 18 screwed or riveted to the door 11 for example. The body 17 comprises a guide rail 19 of profile substantially

  rectangular and open green, the top is substantially U-shaped, for example.

  The guide rail 19 extends from the fixing flange 18 towards the outer surface 11l b of the door 11. The outer end of the rail 19 has an orifice 20. The transmission support 14 is housed in the rail guide 19, the rack 16 being opposite the upper opening of the rail 19. This support 14 is arranged to slide, through the orifice 20, in the guide rail 19. The latter comprises, for example, rectangular protrusions 21 arranged on its longitudinal walls, inside the rail, which form keys. These are housed in two corresponding longitudinal grooves 22 formed on the external longitudinal faces of the transmission support 14 to guide it in movement in said guide rail 19. The longitudinal grooves 22 have a length less than the length of the transmission support. 14 so as to limit its travel relative to the guide rail 19. The handle rod 12b, the transmission support 14 and the guide rail 19 are curved longitudinally, substantially in the form of an arc of a circle for example, to limit I '' space requirement longitudinally so that it can be accommodated

in the thickness of door 11.

  The body 17 of the control mechanism 13 includes a transmission casing 23, in which is mounted a power transmission assembly 24, such as a gear assembly for example. The assembly 24 comprises an output transmission member 24a, such as a gear for example, disposed above the rail 19 and coupled to the rack 16 of the transmission support 14. The body 17 also includes a motor housing 25 formed of two half-casings assembled to each other by i for example by fixing screws. The control mechanism 13 comprises a drive motor 26, such as an electric motor for example, housed in the motorization casing 25 of the body 17. The drive shaft 27 of the electric motor 26 is coupled to a member input transmission 24b, such as a gear, of the power transmission assembly 24. This assembly 24 is designed to couple the drive shaft 27 of the electric motor 26 to the rack 16 of the transmission support 14. The rotation of the drive shaft 27 controls the movement of the transmission support 14 in the guide rail 19, and therefore the movement of the handle rod 12b, coupled to the transmission support 14, between the rest position and the position of use. The control device 100 comprises in particular a member for requesting the use 29 of the handle 12a. This member 29 comprises a flange elastically coupled to the handle 12a by means of a spring leaf 30 and forms a push button in cooperation with a switch 31 mounted on said handle 12a, for example. This leaf spring and this switch can be replaced by any other suitable member. The flange has a shape and dimensions substantially similar to those of the handle 12a, for example, and is superimposed thereon and connected to it by pins 32 housed in corresponding holes 33. The push button 29 is arranged so that a pulse of a user on it in the direction of the arrow D, as shown in FIG. 7, generates an electrical signal requesting use of the handle 12a to the electric motor 26, so as to make

  pass the handle 12a from the rest position to the use position.

  In the position of use, illustrated by FIGS. 8a and 8b, the handle 12a can be actuated manually by a user. Under the effect of sufficient stress, exerted in the direction indicated by the arrow F, the handle rod 12b slides in the groove 15 of the support 14 and the handle 12a can S5 be brought to an actuated position, represented by Figure 9. In this actuated position, the handle 12a is further away from the surface

  exterior 11b of the door 11 that it is in the position of use.

  This additional stroke of the handle 12a allows the unlocking of the lock of the door locking mechanism 11. If the lock is 2o electric, the handle rod 12b is arranged to actuate a lock switch for example. If the lock is mechanical, it unlocks the lock by means of a connecting element, such as a cable for example, one of its ends being fixed to the handle rod 12b. These actuation means are known to those skilled in the art and are not shown here. It should be noted that the handle 12a automatically returns against the transmission support 14 by a spring effect, that is to say in the position of use, when the user releases the handle 12a. The control device 100 comprises a control system for the control mechanism 13. This control system is arranged to transmit predetermined control signals to the electric motor 26. The control system comprises detection means and a electronic unit 28 arranged to generate these control signals. The detection means may comprise means for detecting the state of the lock, locked and unlocked states, of the position of the handle 12a, in particular the positions of rest, use and actuated. The servo system can also include time delays, in particular a waiting time for locking the lock and a waiting time for actuating the handle. The servo system can also incorporate an electronic control unit which is arranged to transmit and receive signals representative of the state of the control device, locked or unlocked state. According to an alternative, the servo system can operate in conjunction with a passenger compartment control unit (electronic card), already present on the vehicle, which transmits and receives signals representative of the state of the lock, condemned and non-condemned states. The locking or unlocking of the lock and the control device can therefore be simultaneous or separate and be carried out by means of a key, an infrared remote control or an access badge.

electromagnetic for example.

  It should be noted that the member for requesting the use of the handle 12a, which generates an electrical signal to the electric motor 26 for passing the handle 12a from the rest position to the use position, may include a remote control. infrared or an electromagnetic access badge or any other equivalent means operating in conjunction with the electric motor servo system to generate such an electrical signal

of use request.

  We will now describe a preferred mode of operation of the

  control device 100 of the invention.

  It is assumed that the control device is in the position of

  rest (Figures 6a and 6b), and that the lock is locked (door 11 closed).

  As long as the passenger compartment control unit is in the locked state, the control system blocks the electric motor 26 and an impulse on the push-button 29 has no effect. When the vehicle is unlocked, the electric signal for requesting the use of the handle 12a, generated by an impulse on the push button 29 (FIG. 7), is transmitted to the electric motor 26, so as to pass the handle 12a from the rest position to the use position (Figures 8a and 8b). The servo system starts the waiting time for actuation of the handle 12b. If the handle is not actuated at the end of this time delay, the servo system transmits a signal to the electric motor to return the handle 12a and the control device to the rest position (Figures 6a and 6b). When the handle 12a is brought into its actuated position (FIG. 9), the lock unlocks and releases the door 11 which can be opened. The servo system starts the lock lock wait timeout. It should be noted that the handle 12a automatically returns to the position of use (FIGS. 8a and 8b) as soon as the user releases it. The servo system then generates a control signal to the electric motor 26 to return the control device 100 to the rest position (Figures 6a and 6b) either as soon as the lock is locked, when the door 11 is closed, or at the end of the lock lock waiting time delay, to avoid leaving the handle 12a unnecessarily in the use position for too long (Figure 8a and

  8b) when door 11 is open. A new push on the button-

  push-button 29 makes it possible to bring out the handle 12a in the position of use when the door 11 is open and the servo system restarts the lock lock waiting time delay, which brings the system back to

the previous state.

  The servo system can also include means arranged to detect an abnormal resistance on the handle 12a, when it passes from the use position to the rest position. These means are arranged to generate a priority control signal to the motor.

  electric 26 so that it brings the handle 12a into the position of use.

  io This prevents a user from pinching their fingers behind the handle 12a when

its return to the rest position.

  The control devices 10, 100 of the present invention have many advantages. They are suitable for any conventional locking mechanism for a side door of the passenger compartment, the trunk door or tailgate, or the hood of a vehicle. In the rest position, the handle 2a, i 2a and the outer surface 1b, 11b of the door 11 are substantially contiguous and the handle is flush with this surface. This makes it possible to have a smooth exterior profile of the door 1, 11 when the handle 2a, 12a is not used,

  allowing to improve safety, aesthetics and aerodynamics of the door.

  The device is sophisticated and very practical. The handle 2a, 12a becomes usable by a simple pressure or manual pulse of the user on the

  handle itself 2a or on the push button 29.

  The motorized control device 100 can also include various detection and timing means which allow operation

safe and efficient.

  The present invention is not limited to the embodiments described above, but extends to any modifications or variants obvious to those skilled in the art. In particular, the control mechanism 13 may be different. This may include a free nut mounted on a master screw driven by an electric reduction motor assembly, this nut being rigidly linked to the transmission support coupled to the handle to control the movement of the handle between the rest and use positions. . According to an alternative, the control mechanism may comprise an eccentric mounted on a drive shaft of a reduction motor assembly and cooperating with the transmission support coupled to the handle, the eccentric being arranged to move the lo handle between the rest and use positions when the drive shaft turns on itself. According to another alternative, the control mechanism may comprise a link articulated at one end to the transmission support coupled to the handle and rigidly connected at the other end to a drive shaft of a reduction motor assembly, the rotation of the drive shaft pivoting the link to move the handle in displacement between the rest and use positions. The handle can also be pivotally mounted on its transmission support, instead of being slidably mounted therein, and be brought manually from the position of use to the position actuated by -o pivoting. This technical solution is in fact a combination of the manual and motorized variants of the device according to the invention, in which a motor is used to move, for example, by sliding, the handle from its rest position to its use position, as for the device 100. However, the handle is manually pivoted until it

  position actuated as for device 10.

Claims (22)

Claims   1. Control device (10, 100) for a mechanism for locking a door (1, 11) of a vehicle, the control device being mounted in a housing (11a, 11a) formed in said door and comprising a manual actuator (2, 12), disposed on the side corresponding to an exterior surface (1b, 11b) of the door, this manual actuator being coupled to said locking mechanism so as to unlock it manually from the exterior of the vehicle, characterized in that said manual actuation member (2, 12) comprises a handle (2a, 12a) movable between a rest position, in which said handle (2a, 12a) and said exterior surface (lb , 1 lb) of the door are substantially contiguous so that a user cannot grasp the handle, and a position of use, in which said handle (2a, 12a) is spaced from said outer surface (lb, 11b) of the door (1, 11) so that a user can grab it.   2. Control device according to claim 1, characterized in that, when the handle (2a, 12a) is in the rest position, it is retracted into no said housing (1la, 11a) of the door (1, 11) and is flush with its surface exterior (lb, 11 b).   3. Control device according to claim 1, characterized in that said handle (2a, 12a) is coupled to said door locking mechanism (1, 11) so that it does not unlock this locking mechanism between said position of rest and said position of use and so that when the handle is actuated manually by a user of said position of use in an actuated position, it unlocks said   door locking mechanism (1, 11).   4. Control device according to claim 3, characterized in that said handle (2a, 12a) is further from the outer surface (1b, 11b) of the door (1, 11) in said actuated position it is not in said position of use.   -5 5. Control device (10) according to claim 3, characterized in that said handle (2a) is moved from its rest position to its position of use under the effect of manual pressure exerted by an operator on this handle in the rest position 6. Control device (10) according to claim 5, characterized in that it comprises a handle support (3) mounted in the housing (la) of the door (1) and provided with a pin (5) on which is pivotally mounted the handle (2a), this axis being disposed approximately in a central region of the handle and separating it into two wings so as to be able to apply a torque by simple manual pressure on at least one of the wings.   7. Control device according to claim 6, characterized in that it comprises at least one return member (6) cooperating with the handle (2a) and the handle support (3), arranged to urge said handle (2a) towards its rest position.   8. Control device according to claim 7, characterized in that it comprises braking means (7) arranged to slow down and dampen the   pivoting of the handle (2a) about its axis (5).   9. Control device according to claim 8, characterized in that   the braking means comprise at least one damper (7a).   10. Control device according to any one of claims   above 5 to 9, characterized in that it comprises at least one end of travel member (8) mounted on said support (3) and arranged to act as a stop for the handle (2a) in the actuated position and generate an electrical signal corresponding. 11. Control device (100) according to claim 3, characterized in that it comprises a control mechanism (13) coupled to said handle (1 2a) and arranged to drive in displacement in a predetermined manner said   io handle (12a) between said rest position and said position of use.   12. Control device according to claim 11, characterized in that said control mechanism (13) comprises a guide rail (19) mounted in the housing (11a) and rigidly connected to the door (11) as well as a support transmission (14) coupled to the handle (12a) and arranged to slide in said guide rail (19), and in that said transmission support (14) comprises a rack (16) coupled to a drive shaft ( 27) of a drive motor (26) by a power transmission assembly (24) so that the drive motor (26) moves the transmission support (14) in the guide rail (19) ) so as to move said handle (12a) between said position   of rest and said position of use.   13. Control device according to claim 12, characterized in that the guide rail (19) and the transmission support (14) each have complementary guide shapes (21, 22) arranged to limit the travel of the transmission support (14) relative to the rail guide (19).   14. Control device according to claims 3 and 12, characterized   in that the handle (12a) has a handle rod (12b) arranged to slide in a groove (15) formed in the transmission support (14) so that the handle (12a) can be moved manually between the position d use and actuated position. 15. Control device according to claim 14, characterized in that the guide rail (19), the transmission support (14) and the handle rod (12b) are longitudinally curved substantially in the form of an arc io of circle.   16. Control device according to claim 14, characterized in that it comprises return means arranged to urge the rod   handle (12a) towards the inside of said groove (15).   17. Control device according to any one of claims 11   16, characterized in that it comprises a servo system arranged to transmit predetermined control signals to said control mechanism (13).   18. Control device according to claim 17, characterized in that said control system comprises at least detection means, timers and an electronic unit (28) arranged to   generating said control signals.   19. Control device according to claim 17 or 18, characterized in that said servo system comprises a use request member (29) arranged to be actuated by a user from outside the vehicle and generate a signal request to use the handle (12a)   towards said control mechanism (13).   20. Control device according to claim 19, characterized in that said user request member comprises a flange (29) coupled elastically to said handle (12a) and cooperating with a switch (31) mounted on said handle ( 1 2a) so as to form a push button.   21. Control device according to any one of claims 17   to 20, characterized in that the servo system is arranged to operate in conjunction with a vehicle interior control unit io which transmits control signals representative of the state of the door locking mechanism (11), states condemned and not convicted, for   lock and unlock said control mechanism (13).   22. Control device according to any one of claims 17   to 20, characterized in that the servo system comprises a separate electronic control unit arranged to lock and   unlocking said control mechanism (13).