Method for resetting a parking lock operating system and parking lock operating system

Abstract

The invention relates to a method for resetting a parking lock operating system (1) for a motor vehicle, wherein the parking lock operating system (1) switches from both the basic position and the transport position to the basic position when the pressure in the hydraulic fluid supply line (7) of the parking lock operating system (1) increases above a second pressure threshold value twice in succession and drops below a first pressure threshold value at a pressure value lower than the second pressure threshold value after each increase in pressure above the second pressure threshold value. The invention also relates to a parking lock operation (1) for a motor vehicle.

Description

Field of the Invention

[0001] The present invention relates to a method for resetting a parking lock operating system for a motor vehicle, wherein the parking lock operating system has a basic position and a transport position, in which the parking lock of the parking lock operating system is enabled, and in the transport position, the parking lock is enabled. The present invention also relates to a parking lock operating system. Background Art

[0002] The disadvantages of the prior art are that when providing a so-called transport mode, in addition to the normal mode / driving mode after a power failure, it is also necessary to check the state / position of the parking lock operating system. Depending on when the power failure occurs, the parking lock operating system is in the basic position or the transport position, and in each of the basic position and the transport position (to ensure normal P function), the parking lock is enabled. However, when determining the position of the parking lock operating system switching by applying pressure, the current position of the parking lock operating system is decisive. It is known to provide a sensor for detecting the position of the parking lock operating system, but this is expensive and requires additional control work. Summary of the Invention

[0003] Therefore, the object of the present invention is to avoid or at least mitigate the disadvantages of the prior art.

[0004] The object of the present invention is achieved by a method for resetting a parking lock operating system having the features of claim 1 and by a parking lock operating system having the features of the dependent claims. Advantageous improvements form the subject matter of the dependent claims.

[0005] More precisely, if the pressure in the hydraulic fluid supply line of the parking lock operating system increases above a second pressure threshold twice in succession and drops below a first pressure threshold after each increase above the second pressure threshold, then the parking lock operating system switches from both the basic position and the transport position to the basic position, where the first pressure threshold is at a lower pressure value than the second pressure threshold. This means that the pressure in the parking lock operating system increases above the second pressure threshold for resetting, then drops below the first pressure threshold, then increases above the second pressure threshold, and then drops below the first pressure threshold again. In other words, by applying pressure above the second pressure threshold twice, a wake-up process is provided that advantageously allows the parking lock operating system to switch to its basic position in an operable manner after an error such as a power failure, regardless of the initial position, i.e., the basic position or the transport position.

[0006] According to one embodiment, when the pressure present in the hydraulic fluid supply line increases to be higher than a second pressure threshold, the parking lock operating system in the basic position can be switched to the drive position, in which the parking lock is deactivated and when the holding magnet of the parking lock operating system is energized, the enabling of the parking lock is prevented. According to one embodiment, when the pressure present in the hydraulic fluid supply line decreases to be lower than a first pressure threshold, the parking lock operating system in the drive position can be switched to the basic position. This means that if the parking lock operating system is in its basic position as the starting position, the parking lock is opened / switched to deactivated and closed / switched to enabled twice, such that after the wake-up process is achieved by applying pressure, the parking lock operating system is in its basic position.

[0007] According to one embodiment, when the pressure present in the hydraulic fluid supply line increases to be higher than a second pressure threshold and then decreases to be lower than a first pressure threshold, the parking lock operating system in the transport position can be switched to the latch position, in which the parking lock is deactivated and the enabling of the parking lock is prevented by the latch mechanism of the parking lock operating system.

[0008] According to one embodiment, when the pressure present in the hydraulic fluid supply line increases to be higher than a second pressure threshold and then decreases to be lower than a first pressure threshold, the parking lock operating system in the latch position can be switched to the basic position. This means that if the parking lock operating system is in its transport position as the starting position, the latch in the latch position is first enabled, in which for example a limp home is ensured, and then the latch is immediately deactivated again, so that after the wake-up process implemented when applying pressure, the parking lock operating system is in its basic position.

[0009] More precisely, this object is also achieved by a parking lock operating system for a motor vehicle, which parking lock operating system has a guide link and a latch element which is torsionally and axially displaceable relative to the guide link, wherein the position of the latch element relative to the guide link defines different positions of the parking lock operating system, and wherein the latch element and the guide link have corresponding inclined surfaces which match each other and interact with each other such that when the latch element is axially displaced along the inclined surface by the pressure present in the hydraulic fluid supply line of the parking lock operating system, the latch element is torsionally displaced relative to the guide link. The inclined surfaces are arranged such that: if the pressure present in the hydraulic fluid supply line increases twice in succession to above a second pressure threshold and drops below a first pressure threshold after each increase in pressure to above the second pressure threshold, the parking lock operating system switches from both the basic position and the transport position to the basic position, in which the parking lock of the parking lock operating system is enabled, and in the transport position, the parking lock is enabled, wherein the first pressure threshold is at a pressure value lower than the second pressure threshold. Thus, by the interaction of the inclined surfaces matched to the pressure thresholds and the control of the pressure application, the parking lock operating system switches to the basic position / basic positioning by a predefined wake-up process, regardless of the position of the latch element / the position of the parking lock operating system.

[0010] According to one embodiment, the first inclined surface of the guide link can be arranged such that when the pressure increases above the first pressure threshold, the latch element is torsionally displaced from the basic position defining the basic position of the parking lock operating system into a first intermediate position in a first rotational direction.

[0011] According to an embodiment, the second inclined surface of the guide link can be arranged such that when the pressure increases above the second pressure threshold, the latch element is torsionally displaced from the intermediate position into a drive position defining the drive position of the parking lock operating system in a second rotational direction opposite to the first rotational direction.

[0012] According to an embodiment, the third inclined surface of the guide link can be arranged such that when the pressure drops below the first pressure threshold, the latch element is torsionally displaced from the intermediate position into a transport position defining the transport position of the parking lock operating system in the first rotational direction.

[0013] According to an embodiment, the fourth inclined surface of the guide link can be arranged such that when the pressure increases above the second pressure threshold, the latch element is torsionally displaced from the transport position into a second intermediate position in the first rotational direction.

[0014] According to an embodiment, the fifth inclined surface of the guide link can be arranged such that when the pressure drops below the first pressure threshold, the latch element is torsionally displaced from the second intermediate position into a latch position defining the latch position of the parking lock operating system in the first rotational direction.

[0015] According to an embodiment, the sixth inclined surface of the guide link can be arranged such that when the pressure increases above the second pressure threshold, the latch element twists from the latched position in a first rotational direction into a third intermediate position.

[0016] According to an embodiment, the seventh inclined surface of the guide link can be arranged such that when the pressure decreases below the first pressure threshold, the latch element twists from the third intermediate position in a first rotational direction into the basic position.

[0017] Thus, the latch element twists in a first rotational direction or a second rotational direction by the interaction of the inclined surfaces matching the pressure thresholds and the control of the pressure application in order to switch between different positions / orientations.

[0018] According to another aspect which can exist independently of or in combination with the above aspects, the invention further relates to a parking lock operating system for a motor vehicle, preferably a hybrid or fully electric motor vehicle. The parking lock operating system has an operating element which can be coupled or is coupled to the parking lock. The operating element can be displaced between a blocking position and a non-blocking position, in which the parking lock is enabled, i.e., the output component of the motor vehicle is prevented from rotating, and in the non-blocking position, the parking lock is disabled, i.e., the output component of the motor vehicle is released for rotation. In particular, the operating element can be displaced along its longitudinal axis. In particular, the operating element can be displaced against the restoring force of a (first) spring element into its non-blocking position. The parking lock operating system has a locking element which can be coupled or is coupled to the operating element. The locking element can be displaced between a locking position and an unlocking position, in which the locking element fixes the operating element in a form-fitting manner in its non-blocking position, i.e., the locking of the operating element is enabled, and in the unlocking position, the operating element can be moved between its blocking position and its non-blocking position, i.e., the locking of the operating element is disabled. In particular, the locking element can be displaced along its longitudinal axis. In particular, the locking element can be displaced against the restoring force of a (second) spring element into its locking position. In other words, the locking element is designed to fix / hold the operating element in a form-fitting manner in its non-blocking position.

[0019] The operating element and the locking element are each operatively connected to a hydraulically operated cylinder. The pressure chambers of the two hydraulically operated cylinders are also connected to a common hydraulic fluid supply line and are matched to each other such that the locking element is displaced from the lower pressure value present in the hydraulic fluid supply line and the operating element is displaced from the higher pressure value present in the hydraulic fluid supply line, the higher pressure value being greater than the lower pressure value. In other words, the locking element has been displaced from a pressure value lower than that of the operating element present in the hydraulic medium supply line. This coupling of the two operating cylinders controlling the operating element and the locking element enables the parking lock to be constructed as simply as possible and also directly hydraulically controlled. In addition, the transport state of the motor vehicle can be reliably switched by using a simple method such that when the hydraulic supply is depressurized, the parking lock is blocked / kept deactivated. Thus, all other operating states of the parking lock operating system can also be easily controlled.

[0020] In addition, the locking element is located between a latched position / latch preparation position and a release position. In the latched position / latch preparation position, the release of the locking element from its locked position is prevented in a form-fitting manner, i.e., the locking element is fixed / locked / latched in its locked position in a form-fitting manner, in particular against the disengagement force / restoring force of a spring element. In the release position, the locking element can move / displace, reposition, preferably twist freely between its locked position and its unlocked position. In other words, the locking element can also enter the latched position / latch preparation position by repositioning, in particular by twisting the locking element, i.e., the stable position in which the locking element is fixed or can be fixed in a form-fitting manner, and can be released from the latched position / latch preparation position. This means that the locking element can reposition, preferably twist, between the latched position and the position released from the latched position / release position. In other words, the latching mechanism can be enabled and disabled by twisting the locking element. The locking element can be held in its locked position against the spring force of a locking spring by a mechanical latching mechanism.

[0021] The parking lock operating system has a latching mechanism for holding the locking element in its locked position in a form-fitting manner, the latching mechanism being designed such that the locking element is in the latch preparation position when the pressure present in the hydraulic medium supply line decreases from a pressure value between a first pressure threshold and a second pressure threshold to a pressure value below the first pressure threshold.

[0022] In other words, the locking element has a first degree of freedom for repositioning between its locking position and its unlocking position (e.g. by applying pressure), wherein the first degree of freedom is formed in particular by the axial displaceability of the locking element. Furthermore, the locking element has a second degree of freedom for repositioning between its latching ready position and its release position, wherein the second degree of freedom is formed in particular by a torsion about the longitudinal axis of the locking element. This means that the parking lock operating system / parking lock operating mechanism is designed such that the locking element can be twisted between its latching ready position and its release position by controlling the pressure present in the hydraulic fluid supply line, and the locking element can be locked without pressure, i.e. the locking element can be mechanically / form - fit fixed when the locking element is in the latching ready position.

[0023] Therefore, disadvantages can be avoided. With the known parking lock operating systems, the automatic closing of the parking lock is ensured in principle. The transport state of a motor vehicle with the on - vehicle network switched off, insufficient charge or the internal combustion engine switched off is not possible and the parking lock remains closed. Furthermore, the parking lock operating system is not very complex, i.e. the parking lock operating system consists of a small number of individual components. In addition, it can thus be ensured that a safe state is always guaranteed in all cases, i.e. the parking lock is always closed in the event of a power failure, even in the intermediate states that occur briefly during operation.

[0024] According to a preferred embodiment, the first pressure threshold can correspond to a lower pressure value from which the locking element is displaced, and / or the second pressure threshold can correspond to a larger pressure value from which the operating element is displaced. Thus, the repositioning of the locking element and / or the operating element for locking / non - blocking or unlocking / blocking is combined with the repositioning between the latching ready position and the release position.

[0025] Therefore, it is also advantageous that the two hydraulic operating cylinders match each other such that when the larger / higher pressure value in the hydraulic medium supply line is exceeded - at which time the locking element presses against the operating element - the operating element is displaced. Thus, the operation of the locking element is reliably achieved.

[0026] According to a particularly preferred embodiment, the latching mechanism can have a guide link and a latching element which can be twisted and axially displaced relative to the guide link. The latching element is in particular firmly connected to the locking element. The guide link can be firmly coupled to the locking cylinder. This has the advantage that the locking spring acting on the locking element also acts on the latching mechanism.

[0027] Also preferably, the latch element and the guide link have corresponding inclined surfaces that interact with each other such that when the latch element is axially displaced, the latch element twists relative to the guide link (about its longitudinal axis). In other words, the axial displacement of the locking element is combined with the twisting of the locking element. Thus, the twisting of the locking element can also be controlled via the hydraulic medium supply line. Therefore, for the second degree of freedom of the locking element, no separate actuating mechanism is required. An increase in the pressure value corresponds to the axial displacement of the locking element (and thus the latch element), such that the twisting of the locking element is combined with the repositioning of the locking element, in particular into its unlocked position.

[0028] According to a particularly preferred embodiment, the latch element and the guide link can be arranged and matched with the operating cylinder and / or the locking cylinder, in particular by forming a first inclined surface on the guide link, such that when the pressure value present in the hydraulic fluid supply line increases from a pressure value below the first pressure threshold to a pressure value above the first pressure threshold, the latch element twists in a first rotational direction. Alternatively or additionally, the latch element and the guide link can be arranged and matched with the operating cylinder and / or the locking cylinder, in particular by forming a second inclined surface (preferably perpendicular to the first inclined surface) on the guide link, such that when the pressure value present in the hydraulic fluid supply line increases from a pressure value below the second pressure threshold to a pressure value above the second pressure threshold, the latch element twists in a second rotational direction (opposite to the first rotational direction). This has the advantage that the twisting of the latch element can be controlled in a targeted manner, in particular in two rotational directions, by controlling the pressure in the hydraulic medium supply line. Thus, the parking lock operating system can operate functionally during normal operation without twisting the latch element (further in the first rotational direction) into the latch-ready position.

[0029] According to a preferred embodiment, the latch mechanism can be designed in the manner of an adjustment mechanism for a ballpoint pen refill. Such an adjustment mechanism is known, for example, from U.S. Patent No. 3,205,863A, so a detailed explanation is omitted.

[0030] According to a preferred embodiment, the locking element can be displaced against the restoring force of a spring element into its locking position, wherein the spring characteristic of the spring element is matched to the operating cylinder and / or the locking cylinder such that the spring force acting on the locking element above a lower pressure value is greater than the spring force below the lower pressure value. Thus, the force provided by the spring element and counteracting the hydraulic pressure increases with the axial displacement of the locking element.

[0031] According to a preferred embodiment, the spring element may have a first individual spring and a second individual spring, the first individual spring being arranged to resist displacement of the locking element at pressures below a lower pressure value, and the second individual spring being arranged to resist displacement of the locking element at pressures above the lower pressure value, wherein the first individual spring has a lower spring constant than the second individual spring. This means that the locking element first moves against the spring force of the weak spring and then (when pressure is applied, where the pressure is above a first pressure threshold) against the spring force of the strong spring.

[0032] For the purpose of facilitating the control of the operating element, it is also advantageous for there to be an electrically operated holding magnet that holds the operating element in its non-blocking position.

[0033] Furthermore, it is advantageous for the operating cylinder and the locking cylinder to be matched to each other such that: when the pressure starts to decrease from a pressure above a larger pressure value, the hydraulic pressure in the operating cylinder assigned to the operating element first drops below the higher pressure value (and thus the operating element is subjected to a pulling force towards its blocking position), and subsequently the hydraulic pressure in the locking cylinder associated with the locking element drops below the lower pressure value (and thus the locking element is subjected to a pulling force towards its unlocking position). This ensures the reliable function of the parking lock operating system.

[0034] In other words, the present invention relates to a hydraulic parking lock operating system in which a normal P function is achieved, i.e., the parking lock is automatically enabled in the event of a power failure, and in which a transport mode is achieved in which the parking lock / parking lock mechanism can be kept deactivated independently of the power supply and the hydraulic supply, i.e., in particular, the parking lock / parking lock mechanism can be de-energized and depressurized, and it can be adjusted via a simple control valve. In other words, the present invention relates to a parking lock operating system having a blocking element / locking element, the parking lock operating system having a first degree of freedom for the normal P function in order to automatically engage the parking lock in the event of a power failure, and the parking lock operating system having a second degree of freedom for the transport mode or the limp home function in order to be able to keep the parking lock open without current and without pressure. Here, the blocking element is latched by a ballpoint pen refill mechanism such that the blocking element is held in a stable position against the disengagement force of a spring member.

[0035] According to another aspect, which may exist independently or in combination with the above aspects, the invention further relates to a method for operating a parking lock operating system for a motor vehicle, wherein the parking lock operating system has an unpressurized basic position ("unpressurized I"), in which the parking lock is enabled, and wherein when the pressure increases above a first pressure threshold, the parking lock operating system switches from the basic position to a first intermediate position ("between the normal channel and the transport channel", low pressure), and wherein when the pressure exceeds a second pressure threshold at a pressure value higher than the first pressure threshold, the parking lock operating system switches from the first intermediate position to a drive position ("open parking position I", full pressure), in which the parking lock is deactivated, and wherein when the pressure drops below the first pressure threshold, the parking lock operating system switches from the first intermediate position to a transport position ("unpressurized II"), and wherein when the pressure increases above the second pressure threshold, the parking lock operating system switches from the transport position to a second intermediate position ("open parking position II", full pressure), in which the parking lock is deactivated, and wherein when the pressure drops below the first pressure threshold, the parking lock operating system switches from the second intermediate position to a latched position ("unpressurized III"), in which the parking lock is deactivated. Thus, the parking lock operating system can be operated in a normal mode (basic position - first intermediate position - drive position) or switched to a transport mode (basic position - first intermediate position - transport position - second intermediate position - latched position). In the transport mode, the parking lock operating system can be locked in the latched position without pressure and current.

[0036] According to a preferred embodiment, when the pressure increases above the second pressure threshold, the parking lock operating system can switch from the latched position to a third intermediate position ("between the transport channel and the normal channel", full pressure), and when the pressure drops below the first pressure threshold, the parking lock operating system can switch from the third intermediate position to the basic position. Thus, the parked position can be released, and the parking lock operating system can be reset from its transport mode to its normal mode.

[0037] According to a preferred embodiment, when the pressure drops below the first pressure threshold, the parking lock operating system can switch from the drive position to the basic position. Thus, the normal P mode is achieved without having to go through the transport mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be described below with reference to the accompanying drawings. In the drawings:

[0039] Figure 1 a longitudinal cross-section of the parking lock operating system is shown; and

[0040] Figures 2a to 13bSchematic diagram showing different positions of the parking lock operating system and the associated positions of the latch mechanism.

[0041] The drawings are only schematic in nature and are only used to understand the present invention. Identical elements have the same reference numerals. The features of the various embodiments may be interchanged. Detailed description of the specific embodiments

[0042] Figure 1 A longitudinal cross-section of the parking lock operating system 1 for a motor vehicle is shown. Based on Figures 2a to 13b the schematic diagram, the function of the parking lock operating system 1 will be described in more detail.

[0043] The parking lock operating system 1 has an operating element 2. The operating element 2 of the parking lock operating system 1 is directly used for the (mechanical) adjustment of the parking lock 3. The operating element 2 can be connected or coupled to the parking lock 3. The operating element 2 can be displaced between a blocking position and a non-blocking position. In the blocking position, the parking lock 3 is enabled. In the non-blocking position, the parking lock 3 is disabled.

[0044] The parking lock operating system 1 has a locking element 4. The locking element 4 can be connected or coupled to the operating element 2. The locking element 4 can be displaced between a locking position and an unlocking position. In the locking position, the locking element 4 fixes the operating element 2 in its non-blocking position in a form-fitting manner. In other words, the blocking of the operating element 2 is enabled, so that the operating element 2 cannot move (return) to its non-blocking position. In the unlocking position, the blocking of the operating element 2 is disabled / not enabled, so that the operating element 2 can move between its blocking position and its non-blocking position.

[0045] The operating element 2 is operatively connected / coupled to a hydraulically operated cylinder 5 and can be displaced thereby. The locking element 4 is operatively connected / coupled to a hydraulic locking cylinder 6 and can be displaced thereby. The operating cylinder 5 and the locking cylinder 6 are each connected to a common hydraulic medium supply line 7 located on one side of their pressure chambers. This means that the operating cylinder 5 is coupled to the hydraulic unit via the same hydraulic medium supply line 7 as the locking cylinder 6, so that the pressure chamber of the operating cylinder 5 always has the same hydraulic pressure as the pressure chamber of the locking cylinder 6.

[0046] The operating element 2 can be longitudinally displaced along its axial direction. The operating element 2 can be displaced against the restoring force / disengagement force / spring force of the first spring element / operating spring 8. The operating element 2 can be biased into its blocking position by the operating spring 8. When the operating cylinder 5 is subjected to a hydraulic pressure higher than the higher pressure value, the operating element 2 is pressed / repositioned from its blocking position against the spring force of the operating spring 8 into its non-blocking position. The locking element 4 can be longitudinally displaced along its axial direction (for adjustment between its unlocked position and its locked position). The locking element 4 can be displaced against the restoring force / disengagement force / spring force of the second spring element / locking spring 9. The locking element 4 can be biased into its unlocked position by the locking spring 9. When the locking cylinder 6 is subjected to a hydraulic pressure higher than the lower pressure value, the locking element 4 is pressed / repositioned from its unlocked position against the spring force of the locking spring 9 into its locked position. In other words, the locking element 4 is designed to fixedly hold / retain the operating element 2 in a form-fitting manner in its non-blocking position, preferably for achieving the transport state of a motor vehicle. The locking spring 9 has a first individual spring 9a and a second individual spring 9b. The first individual spring 9a is arranged such that it counteracts the displacement of the locking element 4 at pressures below the lower pressure value. The second individual spring 9b is arranged such that it counteracts the displacement of the locking element 4 at pressures above the lower pressure value. The first individual spring 9a has a lower spring constant than the second individual spring 9b.

[0047] The operating cylinder 5 and the locking cylinder 6 (e.g., by dimensioning the pressure chambers and / or by dimensioning the operating spring 8 and the locking spring 9) are each matched to one another such that: starting from the smaller / lower pressure value present in the hydraulic fluid supply line 7, the locking element 4 is displaced from a first pressure threshold, and the operating element 2 is displaced from a higher / greater pressure value present in the hydraulic medium supply line 7, which higher / greater pressure value is greater than the lower pressure value of the second pressure threshold. Thus, the operating cylinder 5 and the locking cylinder 6 are matched to one another such that: the operating element 2 is displaced only when the second pressure threshold in the hydraulic fluid supply line 7 is exceeded, at which time the locking element 4 is preferably already pressed against the operating element 2. At the same time, the operating cylinder 5 and the locking cylinder 6 are matched to one another such that: when the pressure in the hydraulic fluid supply line 7 drops from a pressure above the second pressure threshold, the hydraulic pressure in the operating cylinder 5 first drops below the second pressure threshold, and then, following closely behind, the hydraulic pressure in the locking cylinder 6 drops below the first pressure threshold.

[0048] The locking element 4 can be repositioned, in particular twisted, between a latched position / latched ready position and a release position. In the latched position, the release of the locking element 4 from its locked position is blocked in a form-fitting manner, i.e., the locking element 4 is fixed / locked / latched in its locked position in a form-fitting manner. The locking element 4 is held in a stable position, in particular against the disengagement force / restoring force of the locking spring 9. In the release position, the locking element 4 can move / shift (freely) between its locked position and its unlocked position. The locking element 4 can be twisted about its longitudinal axis (for adjustment between the latched position and the release position). In other words, the locking element has a first degree of freedom for adjustment between its unlocked position and its locked position, and a second degree of freedom for adjustment between its latched position and its release position.

[0049] During normal driving operation of the motor vehicle, the operating element 2 is held in its unblocked position by the holding magnet 10 which also serves as a stop. When the operating element 2 is held in the unblocked position by the energized holding magnet 10, the hydraulic pressure at the operating cylinder 5 can be reduced below a higher pressure value, or the operating cylinder 5 can be depressurized.

[0050] The parking lock operating system 1 has a latching mechanism for holding the locking element 4 in its locked position in a form-fitting manner. The latching mechanism can be designed in the manner of an adjustment mechanism for a ballpoint pen refill. The latching mechanism has a latching element 11 and a guide link 12. The latching element 11 is firmly connected to the locking element 4. The guide link 12 is firmly connected to the locking cylinder 6. The latching element 11 and the guide link 12 have corresponding inclined surfaces which interact with each other such that when the latching element 11 is axially displaced along the inclined surface, the latching element 11 is twisted relative to the guide link 12. Thus, a force in the axial direction generates a torque, i.e., a rotation about the longitudinal axis of the locking element 4.

[0051] The locking element 4 is embodied as a pin and can be displaced transversely to the operating element 2. At the end 13 of the locking element facing the operating element 2, the locking element 4 can engage with the operating element 2 in a form-fitting manner, in particular engage with a recess serving as a form-fitting locking element 14.

[0052] The function of the parking lock operating system 1 will be described below with reference to different positions of the parking lock operating system 1.

[0053] In Figure 2a is shown the basic position of the parking lock operating system 1 with power off and depressurized. The hydraulic pressure is below a first pressure threshold such that the spring force of the operating spring 8 holds the operating element 2 in its blocking position / the operating element 2 is retracted and the spring force of the locking spring 9 holds the locking element 4 in its unlocked position / the locking element 4 is retracted. The parking lock 3 is enabled. InFigure 2b shows the corresponding basic position of the latching mechanism. The latching element 11 is located in the normal passage 15 of the guide link 12.

[0054] In Figure 3a shows the first intermediate position of the de-energized parking lock operating system 1. The hydraulic pressure is higher than the first pressure threshold but lower than the second pressure threshold, such that the spring force of the operating spring 8 holds the operating element 2 in its blocking position, and the locking element 4 extends against the spring force of the locking spring 9, in particular the first individual spring 9a, until the end 13 abuts against the operating element 2 (or the outer contour of the operating element 2). The parking lock 3 is enabled. The locking element 4 is in its central position, since the contact of the locking element 4 with the operating element 2 and / or the spring force of the second individual spring 9b prevent the locking element from engaging in the form-fitting locking element 14 and the locking element cannot extend fully into its locking position. In Figure 3b shows the corresponding first intermediate position of the latching mechanism. By increasing the pressure (and the associated axial displacement) above the first pressure threshold, the latching element 11 is twisted in the first rotational direction by the first inclined surface 16 of the guide link 12.

[0055] Figure 4a shows the drive position of the parking lock operating system 1. The hydraulic pressure is higher than the second pressure threshold, such that the operating element 2 extends against the spring force of the operating spring 8 and is pressed into its non-blocking position. The parking lock 3 is deactivated. Since the operating element 2 is now in its non-blocking position and the pressure is higher than the second pressure threshold, the locking element 4 can extend further against the spring force of the locking spring 9, in particular the second individual spring 9b, engage in the form-fitting locking element 14 and assume its locking position. The holding magnet 10 is energized and holds the operating element 2 in its non-blocking position. In Figure 4b shows the corresponding drive position of the latching mechanism. Due to the increase in pressure above the second pressure threshold (and the associated axial displacement), the latching element 11 (starting from the first intermediate position) is twisted / rotated back in the second rotational direction (opposite to the first rotational direction) by the second inclined surface 17 of the guide link 12.

[0056] In Figure 5a and Figure 6a shows the position of the energized parking lock operating system 1. The hydraulic pressure is lower than the second pressure threshold, but the holding magnet 10 is energized, such that the operating element 2 is held in its non-blocking position by the holding magnet 10. The parking lock 3 is deactivated. The locking element 4 retracts by the spring force of the second individual spring 9b (see Figure 5a ) and the spring force of the first individual spring 9a (see Figure 6a ). In Figure 5b and Figure 6bshows the corresponding position of the latching mechanism. By reducing the pressure (and associated axial displacement) below a second pressure threshold (see Figure 5b ) and below a first pressure threshold (see Figure 6b ), the latching element 11 is placed in its basic position by the guide link 12.

[0057] In Figure 7a , the first intermediate position of the de-energized parking lock operating system 1 is shown again. The hydraulic pressure is above the first pressure threshold but below the second pressure threshold, such that the spring force of the operating spring 8 holds the operating element 2 in its blocking position, and the locking element 4 extends against the spring force of the locking spring 9, in particular the first individual spring 9a, until the end 13 abuts against the operating element 2. The parking lock 3 is enabled. The locking element 4 is in its central position, since the contact of the locking element 4 with the operating element 2 and / or the spring force of the second individual spring 9b prevent the locking element from engaging in the form-fitting locking element 14 and the locking element cannot fully extend into its locking position. In Figure 3b , the corresponding first intermediate position of the latching mechanism is shown. By increasing the pressure above the first pressure threshold, the latching element 11 (starting from the basic position) twists in a first rotational direction along the first inclined surface 16 of the guide link 12.

[0058] In Figure 8a , the transport position of the de-energized and depressurized parking lock operating system 1 is shown. The hydraulic pressure is below the first pressure threshold, such that the spring force of the operating spring 8 holds the operating element 2 in its blocking position, and the spring force of the locking spring 9 holds the locking element 4 in its unlocked position. The parking lock 3 is enabled. In Figure 8b , the corresponding transport position of the latching mechanism is shown. The latching element 11 is located in the transport channel 18 of the guide link 12. By reducing the pressure below the first pressure threshold, the latching element 11 (starting from the first intermediate position) twists in a first rotational direction along the third inclined surface 19 of the guide link 12.

[0059] In Figure 9a and Figure 10a , the second intermediate position of the parking lock operating system 1 is shown. The hydraulic pressure is first increased above the first pressure threshold (see Figure 9a ), such that the spring force of the operating spring 8 initially holds the operating element 2 in its blocking position, and the locking element 4 extends against the spring force of the locking spring 9, in particular the first individual spring 9a, until the end 13 contacts the operating element 2, but the locking element cannot fully extend into its locking position, since the contact of the locking element 4 with the operating element 2 and / or the spring force of the second individual spring 9b prevent it from engaging in the form-fitting locking element 14. The hydraulic pressure is then increased above the second pressure threshold (seeFigure 10a ), such that the actuating element 2 is extended against the spring force of the actuating spring 8 and is pressed into its non-blocking position, and the locking element 4 is further extended against the spring force of the locking spring 9, in particular the second separate spring 9b, engages in the form-fitting locking element 14 and assumes its locking position, since the actuating element 2 is now in its non-blocking position. In Figure 9b and Figure 10b , the corresponding second intermediate position of the latching mechanism is shown. By increasing the pressure above the second pressure threshold, the latching element 11 (starting from the transport position) is twisted in the first rotational direction along the fourth inclined surface 20 of the guide link 12.

[0060] In Figure 11a , the latched position of the parking lock operating system 1 with power off and pressure relief is shown. The hydraulic pressure is below the first pressure threshold, but the actuating element 2 is held in its non-blocking position by the locking element 4, and the locking element 4 is held in its locking position by the latched locking element 11, because due to the enabled latching mechanism, the locking element 4 cannot move back out of its locking position against the spring force of the locking spring 9, in particular the first separate spring 9a. The parking lock 3 remains deactivated. In Figure 11b , the corresponding latched position of the latching mechanism is shown. By reducing the pressure below the second pressure threshold, the latching element 11 (starting from the second intermediate position) is twisted in the first rotational direction along the fifth inclined surface 21 of the guide link 12. Due to the geometry of the guide link 12, the latching element 11 remains mechanically in the latched position that holds the locking element 4 in its locking position even in the pressure-relieved state.

[0061] In Figure 12a , the third intermediate position of the parking lock operating system 1 with power off is shown. The hydraulic pressure is above the second pressure threshold, such that the actuating element 2 is extended against the spring force of the actuating spring 8 and is pressed into its non-blocking position. The parking lock 3 is deactivated. Since the actuating element 2 is now in its non-blocking position and the pressure is above the second pressure threshold, the locking element 4 can be further extended against the spring force of the locking spring 9, in particular the second separate spring 9b, engages in the form-fitting locking element 14 and assumes its locking position. In Figure 4b , the corresponding third intermediate position of the latching mechanism is shown. By increasing the pressure above the second pressure threshold, the latching element 11 (starting from the latched position) is twisted in the first rotational direction along the sixth inclined surface 22 of the guide link 12.

[0062] In Figure 13aIn [the figure], the basic position of the parking lock operating system 1 with power off and pressure relieved is shown. The hydraulic pressure is below the first pressure threshold, such that the spring force of the operating spring 8 holds the operating element 2 in its blocking position, and the spring force of the locking spring 9 holds the locking element 4 in its unlocked position. The parking lock 3 is enabled. In Figure 13b In [the figure], the corresponding basic position of the latch mechanism is shown. By reducing the pressure below the first pressure threshold, the latch element 11 (starting from the third intermediate position) twists in the first rotational direction along the seventh inclined surface 23 of the guide link 12. The latch element 11 is again located in the normal passage 15 of the guide link 12.

[0063] Therefore, the latch mechanism or the parking lock operating system 1 is designed such that it switches from any position / setting to the basic position by applying pressure above the second pressure threshold twice.

[0064] List of reference numerals

[0065] 1 Parking lock operating system

[0066] 2 Operating element

[0067] 3 Parking lock

[0068] 4 Locking element

[0069] 5 Operating cylinder

[0070] 6 Locking cylinder

[0071] 7 Hydraulic fluid supply line

[0072] 8 Operating spring

[0073] 9 Locking spring

[0074] 10 Holding magnet

[0075] 11 Latch element

[0076] 12 Guide link

[0077] 13 End

[0078] 14 Form-fitting locking element

[0079] 15 Normal passage

[0080] 16 First inclined surface

[0081] 17 Second inclined surface

[0082] 18 Transport passage

[0083] 19 Third inclined surface

[0084] 20 Fourth inclined surface

[0085] 21 Fifth inclined surface

[0086] 22 Sixth inclined surface

[0087] 23 Seventh inclined surface

Claims

1. A method for resetting a parking lock operating system (1) for a motor vehicle, wherein, The parking lock operating system (1) has a basic position and a transport position. In the basic position, the parking lock of the parking lock operating system (1) is enabled. In the transport position, the parking lock is enabled. It is characterized in that when the pressure in the hydraulic fluid supply line (7) of the parking lock operating system (1) increases above a second pressure threshold twice in succession and drops below a first pressure threshold at a pressure value lower than the second pressure threshold after each increase in pressure above the second pressure threshold, the parking lock operating system (1) switches from both the basic position and the transport position to the basic position.

2. The method according to claim 1, characterized in that, When the pressure in the hydraulic fluid supply line (7) increases above the second pressure threshold, the parking lock operating system (1) in the basic position is switched to a drive position. In the drive position, the parking lock (3) is deactivated and the enabling of the parking lock (3) is prevented when the holding magnet (10) of the parking lock operating system (1) is energized.

3. The method according to claim 2, wherein When the pressure in the hydraulic fluid supply line (7) drops below the first pressure threshold, the parking lock operating system (1) in the drive position is switched to the basic position.

4. The method according to any one of claims 1 to 3, characterized in that, When the pressure in the hydraulic fluid supply line (7) increases above the second pressure threshold and then drops below the first pressure threshold, the parking lock operating system (1) in the transport position is switched to a latched position. In the latched position, the parking lock (3) is deactivated and the enabling of the parking lock (3) is prevented by the latching mechanism of the parking lock operating system (1).

5. The method according to claim 4, wherein When the pressure in the hydraulic fluid supply line (7) increases above the second pressure threshold and then drops below the first pressure threshold, the parking lock operating system (1) in the latched position is switched to the basic position.

6. A parking lock operating system (1) for a motor vehicle, having a guide link (12) and a latch element (11), which can be twisted and axially displaced relative to the guide link (12), wherein, A position of the latch element (11) relative to the guide link (12) defines different positions of the parking lock operating system, wherein the latch element (11) and the guide link (12) have corresponding inclined surfaces (16, 17, 19, 20, 21, 22, 23) that cooperate and interact with each other such that the latch element (11) twists when the latch element (11) is axially displaced relative to the guide link (12) along the inclined surfaces (16, 17, 19, 20, 21, 22, 23), the displacement being caused by the pressure present in the hydraulic fluid supply line (7) of the parking lock operating system (1), characterized in that the inclined surfaces (16, 17, 19, 20, 21, 22, 23) are arranged such that: when the pressure present in the hydraulic fluid supply line increases twice in succession above a second pressure threshold and after each increase in pressure above the second pressure threshold drops below a first pressure threshold at a pressure value lower than the second pressure threshold, the parking lock operating system (1) is switched from both the basic position and the transport position to the basic position, in which the parking lock (3) of the parking lock operating system (1) is enabled, and in the transport position, the parking lock (3) is enabled.

7. The parking lock operating system (1) according to claim 6, characterized in that, The first inclined surface (16) of the guide link (12) is arranged such that: when the pressure increases above the first pressure threshold, the latch element (11) twists from a basic position defining the basic position of the parking lock operating system (1) to a first intermediate position in a first rotational direction; and / or the second inclined surface (17) of the guide link (12) is arranged such that: when the pressure increases above the second pressure threshold, the latch element (11) twists from the first intermediate position in a second rotational direction opposite to the first rotational direction to a drive position defining the drive position of the parking lock operating system (1); and / or the third inclined surface (19) of the guide link (12) is arranged such that: when the pressure drops below the first pressure threshold, the latch element (11) twists from the drive position in the first rotational direction to a transport position defining the transport position of the parking lock operating system (1).

8. The parking lock operating system (1) according to claim 7, characterized in that, The fourth inclined surface (20) of the guide link (12) is arranged such that: when the pressure increases above the second pressure threshold, the latch element (11) twists from the transport position in the first rotational direction to a second intermediate position; and / or the fifth inclined surface (21) of the guide link (12) is arranged such that: when the pressure drops below the first pressure threshold, the latch element twists from the second intermediate position in the first rotational direction to a latch position defining the latch position of the parking lock operating system (1).

9. The parking lock operating system (1) according to claim 8, characterized in that, The sixth inclined surface (22) of the guide link (12) is arranged such that when the pressure increases above the second pressure threshold, the latch element (11) twists from the latched position in the first rotational direction to a third intermediate position; and / or the seventh inclined surface (23) of the guide link (12) is arranged such that when the pressure decreases below the first pressure threshold, the latch element (11) twists from the third intermediate position in the first rotational direction to the base position.

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