Park lock actuating system, drive device and actuating method with electro-mechanical locking function

Abstract

The invention relates to a parking lock actuation system (1) for a motor vehicle, comprising: an actuating element (2) which is movable between a locked position and an unlocked position, in which locked position the parking lock (3) of the motor vehicle is enabled and in which unlocked position the parking lock (3) is disabled; a locking element (4) which is designed to fix the actuating element (2) in the unlocked position in a form-fitting manner; and an electric actuator (5) which has an adjusting action on the locking element (4), wherein an electric current circuit (7) with an autonomous power supply (6) is connected to the electric actuator (5), and a bistable switch (8) and a monostable disconnector (9) arranged in series with the bistable switch (8) are used in the electric current circuit (7). The invention also relates to a drive device (15) comprising the parking lock actuation system (1) and a method for actuating the parking lock actuation system (1).

Description

Field of the Invention

[0001] The present invention relates to a parking lock actuation system for a motor vehicle, preferably for a hybrid or pure electric motor vehicle, the parking lock actuation system having: an actuating element which can be moved between a locking position and an unlocking position, in the locking position, the parking lock of the motor vehicle is enabled / the output component of the motor vehicle is locked against rotation, and in the unlocking position, the parking lock is deactivated / the rotation of the output component of the motor vehicle is released, wherein the locking element is designed to fix / hold the actuating element in its unlocking position in a form - fitting manner; and an electric actuator which has an adjusting action on the locking element. Furthermore, the present invention relates to a drive device for a motor vehicle having the parking lock actuation system and a method for actuating the parking lock actuation system. Background Art

[0002] Generic parking lock actuation systems are known from the prior art. For example, DE 10 2017 102 804A1 discloses a device and a method for actuating a parking lock.

[0003] Other parking lock actuation systems are known from DE 10 2006 049 639 A1, DE 10 2007 006 354 A1, DE 10 2006 053762A1 and DE10 2008 011 898 A1, in particular other parking lock actuation systems having a locking element and corresponding connecting means for realizing, for example, a bistable parking lock state.

[0004] With these designs known from the prior art, it has been found that although the automatic closing of the parking lock is ensured in principle by means of the parking lock actuation system, it is not possible for the motor vehicle to be in a transport state in which the vehicle electrical system is switched off or undercharged and the parking lock remains closed. Summary of the Invention

[0005] Therefore, the object of the present invention is to provide a parking lock actuation system which allows the motor vehicle to be transported in a simple manner independently of the charge state of the vehicle electrical system of the motor vehicle.

[0006] According to the present invention, this is achieved by connecting an electrical circuit having an autonomous (first) power source to the electric actuator and using a bistable switch and a monostable disconnector arranged in series with the bistable switch in the electrical circuit.

[0007] The monostable disconnector enables the parking lock to be actuated in a conventional manner while the motor vehicle is in operation and ensures its automatic closing function. By means of a bistable switch, it is also possible to reliably open / unlock the parking lock while the motor vehicle is in transit. The autonomous current circuit of the electric actuator decoupled from the vehicle electrical system can be operated independently, such that the parking lock can be unlocked independently of the voltage of the vehicle electrical system during transit.

[0008] Other advantageous embodiments are claimed in the dependent claims and are explained in more detail below.

[0009] It is thus also advantageous if the current circuit is equipped with connection elements for connection to an external power source. Preferably, the connection elements extend into the interior / passenger compartment of the motor vehicle in order to be able to actuate the parking lock by connecting an external power source and to close the parking lock in the event of a failure of all power sources.

[0010] Furthermore, it is advantageous if the locking element is provided with a mechanical button for manual operation. This also enables reliable control of the parking lock and, in particular, manual closing of the parking lock in the absence of electrical energy.

[0011] It is also advantageous if the monostable disconnector is designed such that it is closed in its spring-supported basic position. The current circuit can thus be actuated independently of the voltage of the vehicle electrical system.

[0012] It is thus also advantageous if the locking element is spring-loaded such that when the actuating element is operated, the locking element automatically locks itself in the open position of the parking lock and / or the locking element presses against the actuating element in the basic position. In the rest position of the system, the locking element thus forces the actuating element to be fixed / held in the corresponding displacement position in a form-fitting manner.

[0013] More preferably, the actuating element is hydraulically actuated. This results in a reliably operating parking lock.

[0014] Furthermore, the invention relates to a drive device for a motor vehicle, which drive device has a parking lock actuating system according to at least one of the above-described embodiments and a control unit, which control unit can be coupled or connected to the vehicle electrical system and is connected to actuate the bistable switch and the monostable disconnector independently.

[0015] In this regard, it is also advantageous if the first sub-circuit of the control unit controlling the monostable disconnector enables a direct connection of the vehicle electrical system power supply to the monostable disconnector. The connection of the parking lock actuating system is thus achieved in the simplest possible way.

[0016] Alternatively, it is advantageous if a first sub - circuit of the control unit that controls the monostable disconnector realizes an indirect connection of the vehicle electrical system power supply to the monostable disconnector via a control device and / or a monostable closer. This results in reliable actuation of different operating states.

[0017] If a second sub - circuit of the control unit is also directly connected to the electric actuator, the actuation of the parking lock actuation system is further simplified.

[0018] Furthermore, the invention relates to a method for actuating a parking lock actuation system according to at least one of the above - mentioned embodiments, wherein, in a first operating state, the bistable switch is closed and the monostable disconnector is open, such that the current circuit is interrupted and the locking element engages with the actuating element in a form - fitting manner, wherein the actuating element is fixed in its unlocked position, and in a second operating state in which the voltage of the vehicle electrical system has dropped to zero or below a specific limit, the monostable disconnector automatically closes, such that the current circuit is closed, and the electric actuator is driven by breaking the form - fitting between the locking element and the actuating element, such that the actuating element automatically moves to its locked position.

[0019] In this regard, it is also advantageous if the transport state is switched from the first operating state (starting) by disconnecting the bistable switch.

[0020] In other words, according to the invention, a parking lock module (parking lock actuation system) with an electromechanical locking function and a method for actuating it are realized. The normal P - function (normally - enabled parking lock) can be achieved in the case of power failure of the open parking lock. For this purpose, it is proposed that the actuator is energized via a bistable switch and at least one monostable disconnector to open the holding element (locking element) of the actual parking lock actuator. If the bistable switch is closed, in the case of a power failure or when the parking lock is to be actuated, the actuator is powered by a redundant battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The invention will now be described in more detail with reference to the various figures, in which various exemplary embodiments are also shown.

[0022] In the drawings:

[0023] Figure 1 A schematic view of a parking lock actuation system according to the invention designed according to a first exemplary embodiment is shown, in which the basic structure of the parking lock actuation system can be seen, and the locking element fixes the actuating element in its unlocked position.

[0024] Figure 2 Shown is similar to Figure 1Schematic diagram of a parking lock actuation system, in which the electric actuator for adjusting the locking element is now actuated via the vehicle electrical system such that the actuating element acting on the parking lock is released,

[0025] Figure 3 Shows a schematic diagram of a parking lock actuation system according to the invention designed according to a second exemplary embodiment, in which the electric actuator is now connected to a single current circuit and the system is in a stationary position with the parking lock enabled,

[0026] Figure 4 Shows Figure 3 Schematic diagram of the parking lock actuation system in a first operating state, in which the monostable disconnector included in the current circuit is disconnected via the vehicle electrical system, wherein the actuating element moves into its unlocking position such that the locking element engages in the actuating element in a form-fitting manner,

[0027] Figure 5 Shows Figure 3 Schematic diagram of the parking lock actuation system, in which, compared with Figure 4 the actuating element is not subjected to hydraulic pressure, but is prevented from moving back into the locked position by the locking element,

[0028] Figure 6 Shows Figure 3 Schematic diagram of the parking lock actuation system, in which the parking lock actuation system is in a second operating state, in which the current circuit is closed and the energized actuator moves the locking element from the position fixed to the actuating element in a form-fitting manner such that the actuating element independently reaches the locked position,

[0029] Figure 7 Shows Figure 3 Schematic diagram of the parking lock actuation system, in which the actuator is now enabled by means of a connecting element to an external power source in order to again achieve Figure 6 the state of

[0030] Figure 8 Shows Figure 3 Schematic diagram of the parking lock actuation system, in which the locking element is unlocked by a mechanical button,

[0031] Figure 9 Shows Figure 3 Schematic diagram of the parking lock actuation system for illustrating the transport state, in which the bistable switch is enabled via the vehicle electrical system such that the bistable switch is disconnected and at the same time the actuating element is pressed into its unlocking position and the locking element engages in the actuating element,

[0032] Figure 10 Shows similar to Figure 9 Schematic diagram of the parking lock actuation system, in which, compared withFigure 9 In contrast, the actuating element is not subject to hydraulic pressure but is blocked by the locking element before moving back to the locked position, such that in the case of a discharged (first) power source or an undersupplied vehicle electrical system, the locking element holds the actuating element in its unlocked position.

[0033] Figure 11 FIG. shows a schematic illustration of a parking lock actuating system according to the invention designed according to a third exemplary embodiment, in which, compared to the first exemplary embodiment, the vehicle electrical system controls the disconnector not by inserting a monostable closer but via the control unit of the vehicle electrical system, and

[0034] Figure 12 FIG. shows a schematic illustration of a parking lock actuating system according to the invention designed according to a fourth exemplary embodiment, in which the vehicle electrical system power supply is directly connected to the monostable disconnector.

[0035] The drawings are in essence purely schematic and are intended solely for the purpose of understanding the invention. Identical elements are provided with the same reference signs. In principle, the different features of the various exemplary embodiments can also be freely combined. Detailed Description

[0036] Figure 1 FIG. shows a parking lock actuating system 1 according to the invention used in a drive unit 15 of an electric or hybrid motor vehicle. According to Figure 1 and Figure 2 the first exemplary embodiment of the parking lock actuating system 1 is designed to actuate a parking lock 3 and is thus used to adjust the parking lock 3 between an enabled state and a disabled state of the parking lock.

[0037] The parking lock actuating system 1 has an actuating element 2 which is mechanically coupled to the parking lock 3 whose position is identified and which acts directly on the parking lock 3. The actuating element 2 is operated / actuated hydraulically. The actuating element 2 is embodied in this embodiment as a push rod 27 with an integral piston 28 (to form a hydraulic pressure cylinder 26).

[0038] From Figure 2 it can also be seen that the actuating element 2 is spring-loaded by means of a return spring 24 such that it assumes a basic position in the pressureless state and is released for displacement, which corresponds to the locked position of the parking lock 3. Thus, the actuating element 2 is automatically implemented in a locking manner. Although in Figure 2 the locked position of the actuating element 2 can be seen, in Figure 1 the unlocked position of the actuating element 2 has already been implemented since the parking lock 3 is disabled.

[0039] A locking element 4 is provided for locking the actuating element 2 in its unlocked position. The locking element 4, which is embodied as a pin, is prepared for form-fitting engagement in a recess 25 / groove of the actuating element 2. The locking element 4 is aligned and can be moved transversely to the longitudinal direction of the actuating element 2. The locking element 4 is biased by a biasing spring 21 towards the (radial) outer part 23 of the actuating element 2. Thus, the locking element 4 bears against the actuating element 2 or presses against the outer part 23 of the actuating element 2 in the basic position / rest position.

[0040] As Figure 1 can be seen, in the corresponding axial position of the actuating element 2 corresponding to the unlocked position, the locking element 4 thus engages in the actuating element 2 in a form-fitting manner and, against the spring force of the return spring 24, prevents the actuating element from automatically returning to the locked position.

[0041] An electric actuator 5 is provided for moving / shifting the locking element 4 from its basic position to a second position / force-receiving position in which it is disengaged from the actuating element 2 according to Figure 2 . Here, the actuator 5 is embodied as a linear actuator in the form of an electric lifting magnet. The actuator 5 is designed and coupled to the locking element 4 such that the actuator can move the locking element 4 against the biasing spring 21.

[0042] The actuator 5 is connected to an autonomous current circuit 7. According to the invention, the current circuit 7 is provided with its own (first) power supply 6 and two switches 8, 9 connected in series. The first switch 8 is embodied as a bistable switch 8 and is hereinafter referred to as the bistable switch, while the second switch 9 is embodied as a monostable disconnector 9 and is hereinafter referred to as the monostable disconnector.

[0043] Thus, the bistable switch 8 is stable in two different switching positions (closed position and open position). The monostable disconnector 9 is biased towards its closed position. Thus, when the monostable disconnector 9 is actuated, the force-receiving position corresponds to the open position of the monostable disconnector.

[0044] To control the two switches 8, 9 of the current circuit 7, the switches 8, 9 are connected to corresponding sub-circuits 13, 22 of the vehicle electrical system 16. The vehicle electrical system 16 is shown in Figure 1 in a simplified form and can be seen from the vehicle electrical system power supply 18 and the control means 19 of the control unit 17. In a first exemplary embodiment, the monostable disconnector 9 is actuated indirectly via a monostable closer 20, which in turn is controlled via the control unit 19. The monostable closer 20 is biased towards its open position. Thus, when the monostable closer 20 is actuated, the force-receiving position corresponds to the closed position of the monostable closer.

[0045] In Figure 1In the open position (basic position) of the monostable closer 20 implemented therein, the monostable opener 9 is thus not enabled and is in its closed position. If the monostable closer 20 is actuated by the control unit 19 and accordingly supplied with current, the monostable closer closes and the monostable opener 9 opens. Thus, the monostable closer 20 is used to selectively open and close the first sub-circuit 13 of the vehicle electrical system 16, which is implemented to control the monostable opener 9.

[0046] The bistable switch 8 is connected / can be actuated via another (third) sub-circuit 22 of the vehicle electrical system 16 and has Figure 1 an open position therein. By appropriately actuating the third sub-circuit 22, the bistable switch 8 is switched between its open position and its closed position.

[0047] Furthermore, the second sub-circuit 14 of the vehicle electrical system 16 is connected to the actuator 5. Thus, in this embodiment, the actuator 5 can also be driven independently of the current circuit 7. By Figure 2 , the actuator 5 is even actuated via this second sub-circuit 14 / vehicle electrical system 16.

[0048] Figure 1 and Figure 2 also identified in are the connecting element 10 and the existing button 12, which can be used together or jointly in the parking lock actuating system 1. The connecting element 10 is used to connect an external power supply 11, which is preferably located inside the motor vehicle. Thus, the actuator 5 can also be actuated directly via this connecting element 10 and independently of the first power supply 6 and the vehicle electrical system 16. To this end, alternatively or additionally, there is a mechanical / manual operating button 12. The button 12 is mechanically directly coupled to the locking element 4 and thus allows the locking element 4 to be manually operated from the outside.

[0049] Figures 3 to 10 shows another second exemplary embodiment, by means of which the various operating states of the parking lock actuating system 1 can be seen particularly clearly. This second exemplary embodiment is basically constructed and operates according to the first embodiment, and therefore, for the sake of brevity, only the differences are described below.

[0050] As Figure 3 can first be seen in, in the rest position / basic position of the parking lock actuating system 1, in this embodiment, there is no direct connection between the actuator 5 and the vehicle electrical system 16. Thus, the actuator 5 can only be actuated via the current circuit 7 or via the optional connecting element 10.

[0051] By Figure 3, first, a state is achieved in which the parking lock 3 is enabled and the actuating element 2 is thus in its locked position. The locking element 4 is pressed into its basic position and contacts the outer part 23 of the actuating element 2, but does not engage with the actuating element 2 in a form - fit manner. Neither the first power source 6 nor the second power source in the form of the vehicle electrical system power supply 18 is enabled, and thus the monostable closer 20 is open and the monostable opener 9 is closed. The bistable switch 8 is in its open position.

[0052] Figure 4 and Figure 5 Also shown is the normal (first) operating state during the driving state of a motor vehicle. In Figure 4 , first, the parking lock 3 is released. For this purpose, the actuating element 2 is pressed from its locked position into its unlocked position by hydraulic pressure, wherein the locking element 4 engages automatically with the actuating element 2 in a locking / latching manner upon reaching the unlocked position. Thus, in the unlocked position of the actuating element 2, the locking element 4 engages automatically with the recess 25 / the actuating element 2 in a form - fit manner. According to Figure 5 , after a subsequent partial pressure reduction of the actuating element 2, the actuating element 2 is supported in the unlocked position by the locking element 4.

[0053] In Figure 4 and Figure 5 , both the vehicle electrical system power supply 18 and the first current 6 have a sufficient charge / voltage value state. The monostable closer 20 is enabled and thus closed, such that the current circuit 7 is opened by the enabling / disabling of the monostable opener 9. The bistable switch 8 is in its closed position, such that the parking lock 3 can be automatically closed in the event of a drop in the vehicle electrical system voltage.

[0054] Combined with Figure 6 shows the process of automatically closing the parking lock 3 in a second operating state in which the voltage of the vehicle electrical system 16 has dropped to zero or below a specific limit. If the drop in the vehicle electrical system voltage causes the monostable opener 9 to automatically close, the current circuit 7 is closed, and the actuator 5 is driven by the first power source 6, such that the locking element 4 disengages from the form - fit locking with the actuating element 2. Then, the actuating element 2 automatically moves into its locked position.

[0055] Figure 7 and Figure 8 show the functions of the connecting element 10 and the button 12 in more detail again. Thus, the actuator 5 can be connected to the connecting element 10 and driven by an external power source 11 both when the vehicle electrical system power supply 18 discharges and when the first power source 6 discharges, such that the form - fit between the locking element 4 and the actuating element 2 is eliminated. The locking element 4 can also be actuated directly using the button 12.

[0056] Figure 9 andFigure 10 illustrates the corresponding transport states of a motor vehicle. For this purpose, the bistable switch 8 first enters its open position from the first operating state by being enabled via the vehicle electrical system 16 ( Figure 9 ). Thereby, the current circuit 7 is interrupted and the actuator 5 is deactivated; when the parking lock 3 is open, the locking element 4 fixes the actuating element 2 in a form-fitting manner. Finally, if both the vehicle electrical system power supply 18 and the first power supply 6 are completely discharged, the motor vehicle can still be moved ( Figure 10 ).

[0057] Then, Figure 11 illustrates a third exemplary embodiment that is substantially based on the first exemplary embodiment. Compared with the first exemplary embodiment, the monostable closer 20 is omitted in this embodiment, and the control unit 19 is directly connected to the monostable opener 9 via the first sub-circuit 13. Therefore, the monostable opener 9 is actuated directly via the control unit 19.

[0058] According to Figure 12 , as an alternative, it is advantageous to directly connect the vehicle electrical system power supply 18 to the monostable opener 9, and to directly operate the monostable opener 9 via the vehicle electrical system power supply 18 and to keep it in its open position when the vehicle electrical system power supply 18 is switched on and fully charged.

[0059] In other words, it is preferably proposed that the locking element 4 (pin, hook, pawl, etc.) is transverse to the actuating element 2 of the parking lock 3, which locking element can be electrically disengaged by means of an electromechanical linear actuator 5 (for example, a lifting magnet) and is located passively (for example, spring-loaded) in a corresponding recess 25 (transverse groove, optionally a projection, usually form-fitting) in the actuating element 2. The position of the form-fitting element 25 is selected such that once the locking element 4 engages, the parking lock 3 remains open against the force of the return spring 24.

[0060] In addition to the vehicle electrical system current supply circuit of the vehicle, the actuation of the parking lock also includes a separate (redundant) circuit 7 for the parking lock 3, which does not require any electronic components. Therefore, two batteries (also referred to as the first power supply 6 and the vehicle electrical system power supply 18) can be used as voltage sources. The actuation is achieved via three electrical switches 8, 9, 20 (for example, relays / relay switches).

[0061] In a first variant, the current circuit 7 for DC supply (to unlock the actuating element 2 and thus close the parking lock 3) runs via a redundant battery (first power supply 6), a monostable opener 9 and a bistable switch 8. The bistable switch 8 is actuated via the vehicle electrical system battery (vehicle electrical system power supply 18) and the parking lock control unit 19.

[0062] The actuation of the monostable disconnector 9 occurs via the vehicle electrical system battery and the monostable closer 20, which is actuated via the vehicle electrical system battery and the parking lock control device.

[0063] For normal driving, the switch 8 will close or switch to closed (stable). To open the parking lock 3, the closer 20 first closes via the parking lock control device 19. As a result, the current circuit 13 for actuating the disconnector 9 closes, causing the disconnector 9 to open. Consequently, the current circuit 7 for driving the linear actuator 5 opens. If the parking lock 3 is now hydraulically opened, the holding element (also known as the locking element 4) can engage under spring loading (since it is not held open by the linear actuator 5; Figure 4 )

[0064] Since the parking lock 3 is now held open by the locking element 4 ( Figure 5 ), the pressure in the parking lock actuator cylinder 26 can now be removed to open the parking lock 3.

[0065] Normal - P function: If a fault occurs in the vehicle electrical system 16 (no current from the vehicle electrical system power supply 18), the closer 20 opens; causing the current circuit 13 of the disconnector 9 to open, making it close. When the disconnector 9 closes, the current circuit 7 is closed to the linear actuator 5 via the redundant battery (first power supply 6), thereby causing the locking element 4 to disengage, and thus closing the parking lock 3 ( Figure 6 )

[0066] The conventional closing process can also be carried out in the same way. For this purpose, the current supply to the closer 20 is actively interrupted by the parking lock control unit 19 ( Figure 6 )

[0067] Optionally, a connection option 10 (e.g., inside the vehicle) is provided for an external (e.g., 12V) power supply 11 parallel to the linear actuator 5. If all the batteries in the vehicle fail completely, the external power supply 11 can close the parking lock 3 by pulling out the locking element 4 ( Figure 7 )

[0068] The parking lock 3 can also be closed purely mechanically via an optional manual operation button 12, which directly causes the locking element 4 to disengage ( Figure 8 )

[0069] The transport mode (opening the parking lock 3 regardless of the charge state of all the power supplies in the vehicle) is enabled by disconnecting the bistable switch 8. This interrupts the current circuit 7 for actuating the linear actuator 5, such that no current can flow to the linear actuator 5 regardless of the charge state of all the other buttons and all the batteries present ( Figure 9 )

[0070] The parking lock 3 can now be opened hydraulically, such that the locking element 4 engages and holds the parking lock 3 open passively. Regardless of which battery is charged or in which order a fault occurs, the parking lock 3 remains open and the vehicle can roll freely( Figure 10 ).

[0071] A second extended variant( Figure 1 and Figure 2 ) provides the possibility of closing the parking lock 3 not only via the battery (first power source 6) but also via the vehicle battery (vehicle power source 18). For this purpose, another circuit 14 is provided, which connects the linear actuator 5 to the vehicle battery (vehicle power source 18) and the parking lock control unit 19. Thus, redundancy related to opening the parking lock can also be achieved. All other states are retained.

[0072] In two further variants, only two switches 8, 9 (relays) are required. In a first additional variant( Figure 11 ), the disconnector 9 is directly supplied via the vehicle electrical system battery (vehicle electrical system power source 18) and the electrical controller 19.

[0073] In a second additional variant( Figure 12 ), the disconnector 9 is only supplied via the vehicle electrical system battery and is no longer actuated actively via the electrical controller 19. This is possible because the active closing of the parking lock 3 can occur directly via the actuation of the linear actuator 5 for unlocking via the current circuit 7 passing through the vehicle electrical system battery, the electrical controller 19, and the linear actuator 5.

[0074] List of reference signs

[0075] 1 Parking lock actuation system

[0076] 2 Actuating element

[0077] 3 Parking lock

[0078] 4 Locking element

[0079] 5 Actuator

[0080] 6 First power source

[0081] 7 Current circuit

[0082] 8 Bistable switch

[0083] 9 Monostable disconnector

[0084] 10 Connecting element

[0085] 11 External power source

[0086] 12 Button

[0087] 13 First sub - circuit

[0088] 14 Second sub - circuit

[0089] 15 Driving device

[0090] 16 Vehicle electrical system

[0091] 17 Control unit

[0092] 18 Vehicle electrical system power supply

[0093] 19 Control device

[0094] 20 Monostable closer

[0095] 21 Biasing spring

[0096] 22 Third sub - circuit

[0097] 23 Outer part

[0098] 24 Return spring

[0099] 25 Recess

[0100] 26 Pressure cylinder

[0101] 27 Push rod

[0102] 28 Piston

Claims

1. A parking lock actuation system (1) for a motor vehicle, the parking lock actuation system: having an actuating element (2) which is movable between a locking position and an unlocking position, in the locking position the parking lock (3) of the motor vehicle is enabled, and in the unlocking position the parking lock (3) is disabled; having a locking element (4) designed to positively fix the actuating element (2) in the unlocking position of the actuating element; and having an electric actuator (5) which acts on the locking element (4), characterized in that a current circuit (7) having an autonomous power source (6) is connected to the electric actuator (5), and a bistable switch (8) and a monostable disconnector (9) arranged in series with the bistable switch (8) are used in the current circuit (7).

2. The parking lock actuating system (1) according to claim 1, characterized in that, The current circuit (7) is equipped with a connecting element (10) for connection to an external power source (11).

3. The parking lock actuating system (1) according to claim 1 or 2, characterized in that, The locking element (4) is provided with a mechanical button (12) for manual actuation.

4. The parking lock actuating system (1) according to one of claims 1 to 3, characterized in that, The monostable disconnector (9) is designed such that the monostable disconnector is closed in the spring-supported basic position of the monostable disconnector.

5. The parking lock actuating system (1) according to one of claims 1 to 4, characterized in that, The locking element (4) is spring-loaded such that when the actuating element (2) is actuated, the locking element automatically locks the actuating element in the open position of the parking lock (3) and / or in the basic position, and the locking element bears against the actuating element (2).

6. A drive device (15) for a motor vehicle, having a parking lock actuating system (1) according to one of claims 1 to 5 and a system which can be coupled or connected to the vehicle electrical system power source (18) to independently actuate the bistable switch (8) and the monostable disconnector (9) to which the control unit (17) is connected.

7. The drive device (15) according to claim 6, characterized in that, A first sub-circuit (13) of the control unit (17) which controls the monostable disconnector (9) effects a direct connection of the vehicle electrical system power source (18) to the monostable disconnector (9) or an indirect connection of the vehicle electrical system power source (18) to the monostable disconnector (9) via a control device (19) and / or a monostable closer (20).

8. The drive device (15) according to claim 6 or 7, characterized in that, A second sub-circuit (14) of the control unit (17) is also directly connected to the electric actuator (5).

9. A method for actuating a parking lock actuating system (1) according to one of claims 1 to 5, wherein, In a first operating state, the bistable switch (8) is closed and the monostable disconnector (9) is open, such that the current circuit (7) is interrupted and the locking element (4) engages positively with the actuating element (2), wherein the actuating element (2) is fixed in the unlocking position of the actuating element, and in a second operating state in which the voltage of the vehicle electrical system (16) has dropped to zero or below a specific limit, the monostable disconnector (9) automatically closes, such that the current circuit (7) is closed, and the electric actuator (5) is driven by breaking the positive engagement between the locking element (4) and the actuating element (2), such that the actuating element (2) automatically moves into the locking position of the actuating element.

10. The method according to claim 9, characterized in that, Switching to the transport state by disconnecting the bistable switch (8) from the first operating state.

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