DE4135931C1 - Pressure supply system for providing positioning elements with differing pressures - has controllable compressor connected to elements via feed line, pressure sensor and control switches - Google Patents

Abstract

A pressure supply system for supplying at least two positioning elements (5,6) with different operating pressures which are both connected to a controllable pressure generator (2) via a feed line. The elements (5,6) both have a positioning member. They are separate and independently controllable. The first element (5) performs its function as part of a central locking system at a first pressure level. The second element (6) operates at a second level. The system includes a generator (2) which is controllable by at least one pressure sensor (DS) for generating different pressure levels. This is alternately actuable by a control switch (7) associated with the central locking system (ZVA) to commonly operate several similar elements with low levels. The second element (6) is part of a door lock assist device (TSH). The generator (2) is actuable by a second switch (8) to operate at a low pressure level. USE/ADVANTAGE - Esp. for use in motor vehicles, e.g. as common pneumatic feed system for central locking system and door lock whose elements operate at different pressure levels.

Description

The invention relates to a pressure supply system the features of the preamble of claim 1, which DE 39 15 861 A1 emerge. The actuator described there for a central locking system includes in a common housing (first) central locking actuator and a (second) Anti-theft control element, each with a diaphragm piston. Due to differences in effective area between the membrane pistons get a ranking control that ensures that at locking the vehicle always the central locking before the theft protection becomes effective. The said pressure scripture deals essentially with the constructive on build the actuator itself and does not go to one Pressure control or modulation of the bi-pressure generator and on its special activation.

In another such system (DE 26 47 789 A1), which as Type of print exclusively modulatable pneumatic vacuum uses, are two two-stage work elements (DE 26 40 561 A1) provided. The two diaphragm piston actuators each Work elements act on a common actuator Lock or locking linkage. You are inside an egg nes uniform housing and arranged on the same connect to a common line for a vacuum equalization container or suction pipe connected and are ge common return spring applied which is an unpressurized reason position and the targeted setting of an intermediate  position supported. By setting this intermediate position - starting from the Basic position in which the lock is unlocked - with a small one rem ("modulated") negative pressure becomes an assigned lock locked while the same lock is activated by the second actuator of the actuator with the full bottom be brought into an anti-theft position can. The first actuator is in the intermediate position further movement in the same direction is supported in the housing, whereas the second actuator is still movable.

A great advantage of these pressure supply systems is one fold structure, which on the control elements no distributor or Branch valves required.

In a known central locking system for motor vehicle Door and flap locks (DE 31 15 387 A1) are every door lock assigned two double-acting pneumatic actuators, whose actuators act on different lock levers and which are attached separately from each other. There are different variants for the pressure supply of the two groups of Control elements disclosed, but which is common that each Group is acted on via its own line system. This was deemed necessary for a reversible ranking tion of the timing of the control element groups to be able to achieve.

It is known that a single vehicle door lock has a dop pelt-acting pneumatic actuator (DE 35 28 123 C1) a central locking system (ZVA) to unlock it and locking and a single acting against spring force Another pneumatic control element (DE 88 09 151 U1) Door locking device (DE 40 06 126 A1) can be assigned can. These two types of control elements each work with their own  Actuators on different lock levers and must therefore be spatially separated from each other. The door closing aid control element is only used for ent locked door and only pressurized. The assigned ZVA control element is in the position in which it is placed by pressurization, in Contrary to the locking position in which it is through sub controlled pressurization of its single working chamber can be. The overpressure for actuating the control element of the door lock aid device must be higher (approx. 2,500 hPa) than that for the (unlocking) operation of the ZVA not agile overpressure (approx. 1,300 hPa). In addition, in the opposite Individual control for the ZVA control elements to be possible. Therefore, for the two plants are so far under different pressure generators and separate hose line systems intended. This brings a high assembly and material wall with itself.

Pneumatic supply systems are also known (DE 35 26 763 C2, DE 38 28 776 A1), in which in one with over or Negative pressure of different pressure levels of main feed line, which is also referred to as a pneumatic bus line a pressure sensor to control the pressure generator - a bi-pressure pump - is provided. Different pneuma tables, which in turn each have a delivery with specific pressure levels can be switched over Valves are connected to the main wiring harness. With such a system, a single (controllable) Pressure generator turned on for several different consumers be put, which is also a certain simplification in the lei relocation, but the control of the elec tromagnetically switchable valves still relatively expensive, and  also the centrally controllable valves themselves, along with their sales ventilation represent a considerable cost factor.

Also from the post-published DE 40 20 108 A1 corresponding to the older patent application P 40 20 108.2 Pneumatic control system known, in that of a bi-pressure pump pumped pressure medium with the help of several pre-controllable Solenoid directional valves to several consumers, u. a. also one Central locking, is controlled. To monitor the pressure in the consumers representing an open system and for Monitoring the overpressure or vacuum in a ge closed system is a multiple pressure sensor on the ladder plate of an evaluation circuit arranged.

The invention has a simple task Pressure supply system of the type specified in the preamble of claim 1 to the concerns of a central lock equipment and door locking device Adapt vehicle.

This task is carried out with the characteristic features of Pa Claim 1 solved according to the invention.

The characteristic features of the subclaims give advantage adhesive developments of the pressure supply according to the invention plant.  

Further details and advantages are shown in the drawing Embodiment and their subsequent here detailed description.

Show it

Fig. 1 is a hydraulic pressure supply system, shown only schematically for actuating elements of a central locking system and a door closing aid device,

Fig. 2 shows a detail of FIG. 1 with a schematic diagram of each one of the actuating elements of both systems,

Fig. 3 shows the detail of Fig. 2 with an additional switchable valve for individual activation of an actuating element of the door closing aid device.

In the form of an electropneumatic circuit diagram, Fig. 1 shows essential components of a central locking system (ZVA) and a door closing aid device (TSH) in a motor vehicle.

The core of both systems is a central control unit 1 with voltage supply from the vehicle electrical system, which in addition to an electronic control circuit with various inputs - which will be explained later - also includes a driver stage and an electric motor which acts as a drive for a controllable pressure generator 2 with a reversible ( Bi-pressure) pump BiP is used. The latter is connected on one side - via a filter Fi - to the atmosphere and on the other hand to a pneumatic introduction system 3 , which serves as a common, here annular supply line for the two aforementioned systems ZVA and TSH. Of course, a central line could also be provided as the supply line. It should be noted to clarify the term that "single-line system" here means a system with a single supply line connected to a pump outlet, which can be acted upon alternately with positive and negative pressure.

The control unit 1 is also connected to at least one pressure sensor DS, which detects the actual pressure level in the induction system. Its signal is used in particular for the control and regulation of the pressure generator 2 , and also for its end stop. It goes without saying that several decentralized pressure sensors could also be provided, in particular to monitor pressure build-up times and to detect any leaks.

Various branches 4 , each with a (first) actuating element 5 of the ZVA, are provided in the introduction system 3 . In a known manner, these are each assigned to a door or flap lock of different locking points, in particular the locking point FT on a driver's door, BT (passenger door), PTL or PTR (left or right passenger or rear door) and HD (trunk lid). At each of the door locking points, a (second) actuating element 6 of the TSH is arranged separately from the first actuating element 5 , which is connected via the corresponding branch 4 mentioned above to the actuating system parallel to the actuating element 5 of the ZVA. It is essential that the two control elements 5 and 6 can be pressurized simultaneously. For the sake of simplicity, the drawing of the structurally identical control elements in the passenger doors has been omitted; rather, these have only been indicated by dashed branches 4 .

The locking points FT, BT and HD are also each assigned a control switch 7 for a multi-point condition of the ZVA, which are designed here as change-over contacts with a neutral middle position. These control switches 7 are connected in parallel to each other; their fixed contacts are each connected to an unlocking and a locking control line (EL, VL) to the control unit 1 . The grounded switching contacts of the control switch 7 can NEN each z. B. in a known manner by keying actuation of a locking cylinder assigned to one of the fixed contacts to effect a central unlocking or locking of all closures via the corresponding inputs of the control unit 1 .

Each with an actuating element 6 of the TSH locking point is additionally assigned a control switch 8 designed as a single-pole button, all control switches 8 being connected via separate lines to each input of control unit 1 . These control switches are also provided and shown in the passenger door closing points. In a known manner, each of them detects a specific position of the lock coupled to the actuating element of the actuating element 6 , for. B. he sums up whether a catch of the lock is in the pre-locked position.

The TSH is intended to support the closing (closing) of vehicle doors, support being provided when the corresponding door is ajar or when the lock falls into the commonly used pre-locking position. The actuating element 6 then pulls the lock into the main rest position, for what purpose its actuator z. B. attacks via a lever on the rotary latch. Normally, an individual pneumatic activation is desired to keep the response and running times relatively short; however, switchable valves are necessary for this.

Such a system is in the state of the art mentioned at the beginning sufficiently described, so that it is not discussed in more detail here to be walked.

Fig. 2 shows a schematic sectional view of one control element 5 of the ZVA and one control element 6 of the TSH. It is evident that both are arranged in separate housings and in a known manner, each with an actuator 5 S or 6 S and with Membrankolben-actuators, each having a working chamber, in which a pneumatic pressure and vacuum can be passed. The actuator 5 is double-acting and bistable, that is, its working chamber must be alternately pressurized and depressurized to control the actuator 5 S between its stable end positions back and forth. Intermediate positions are undesirable with regard to compliance with defined lock locking states.

In contrast, the control element 6 is designed to be single-acting. It is operated with excess pressure to extend its actuator and is returned to its basic position by spring force without performing mechanical work on the lock as soon as the excess pressure is released. For this purpose, a decoupling from the lock component to be moved is possible or a play in the power transmission that enables this idle stroke is provided. For rapid pressure reduction, it is known that either the bi-pressure pump has a flow short-circuit at a standstill or can be briefly driven in the opposite sense, or a vent valve must be provided.

It should also be noted that the separation of the housing of the two actuating elements 5 and 6 is not necessarily functionally necessary, but is preferred here for adaptation to the special effects. As such, the actuators 5 S and 6 S, which can be moved independently of one another, could also be designed from a common housing.

While the overpressure and underpressure for operating the control elements 5 of the ZVA deviates only relatively little from the atmospheric pressure (approx. 1,300 and 700 hPa), the TSH control elements 6 are operated with overpressure of approx. 2.5 bar. The response thresholds of the two types of actuators therefore differ significantly from one another.

The function of the control switch in this context should also be mentioned that an activation of the pressure generator 2 to generate overpressure / underpressure of the aforementioned lower levels by actuating one of the control switches 7 , depending on its direction of operation, is possible (central locking operating mode). By actuating one of the control switches 8 , the pressure generator is only activated to generate the higher excess pressure (door closing aid operating mode). The pressure level control is carried out by the pressure sensor DS and the control unit 1 .

A connection of the two control element groups without the interposition of controllable group valves to the same Einleitungssy system and their simultaneous action is now possible on the one hand by the use of the adjustable pressure generator 2 and the design of the control elements selected here. As can be seen from the qua litative schematic representation in Fig. 2, the effective area of the actuating element 5 is larger than that of the actuating element 6 , so that a sufficient actuating force can be built up even at low pressure. On the other hand, due to its smaller effective area and the spring restoring force that has to be overcome, the adjusting element 6 can only work at higher pressure, ie its response threshold is significantly higher.

Advantageously, in the application described here, as already mentioned, the ZVA actuating elements 5 are regularly in the position of one or more TSH actuating elements 6 in the position into which they were brought by pressurization.

Consequently, when the higher pressure level is generated by the pressure generator 2 at the ZVA actuating elements 5, no further actuating action is triggered, because their actuators are already in their end position. Damage is of course excluded here, since sufficient security against overuse, e.g. B. operated in a blocked castle or Winterbe, are already considered constructively.

It would even be possible in principle with the system described here, in certain accidents, e.g. B. with stiffness of lock release levers and corresponding problems with the central unlocking of locks of the vehicle, the control elements of the ZVA operate exceptionally with the higher pressure of the TSH, in order to possibly achieve a breakaway effect. In such a case, in which all door locks are in their "closed" position, it is also irrelevant whether the actuating elements of the TSH are additionally activated. This "high pressure release" could, for. B. automatically after repeated unsuccessful switching operations on the control switches 7 or ineffective normal operation of the Stellele elements 5 - what z. B. could be reported by an electrical detection of the entry position entie - be activated. On the other hand, a negative pressure on the pneumatic induction system does not affect the control elements 6 of the TSH, because these are held in the basic position by their return springs.

As already mentioned, an individual or demand-controlled loading of the actuating elements 6 of the TSH is preferable to the joint loading. Fig. 3 shows a possi bility to implement such a method of operation with also simple means without leaving the basic idea of the simultaneous loading of all control elements. The section is the same as in Fig. 2, but in the connec tion between the branch 4 and the actuator 6 of the TSH a preferably designed as a rotary valve, mechanically drivable 2/2 valve 9 is installed. The valve 9 is coupled with a rotary latch 10 of the associated door lock, not shown, such that it takes the drawn locking position when the rotary latch is in the "closed" position, while it is in the "release" position of the rotary latch the Stellele ment 6 connects to the branch. In addition, it should be noted that conventional rotary latches are biased towards their release position and are held in the closed position by a pawl.

In contrast to the prior art, the valve 9 is not intended to prevent the actuating element 6 from being subjected to an incorrect pressure level. Rather, the arrangement according to FIG. 3 has the effect that a closing aid is only available as needed at the open or in the pre-locked position, the door locks are offered, while the actuating elements 6 remain on the closed doors in their relief position. Of course, in this variant it is to be considered constructively that the rotating latch position changing when the lock is closed does not lead to an obstruction of the compressed air loading of the associated actuating element 6 on the valve 9 . This can e.g. B. can be achieved by a gear, not shown, between the rotary latch 10 and valve 9 , which allows switching of the valve 9 into its locking position only immediately before or after the pawl engages in the main catch of the rotary latch.

In another, somewhat more complex variant, which is not shown here, the individual activation of the actuating elements 6 of the TSH could also be achieved electrically with electromagnetic switchable valves, these in turn using the already existing, the "release" or Vorraststel development of the lock signaling control switch 8 could be switched on in order to connect the respective control element 6 to the induction system 3 . With a delayed switch-off of these valves compared to the disappearance of the switch signal into their blocking rest position, the pneumatic connection would also be ensured until the pawl engages.

It should be expressly noted that deviating from the execution example also play an "island solution" with only one first and two each th actuator could be realized, for example on a trunk lid lock an actuator to support the Closing and opening the lock and the other one for opening and retracting a dirt-free handle could. Both control elements would then be double kender design.

In addition, one can not be shown in the induction system ter diagnostic connection for a leak test using a external testing and diagnostic devices can be provided.

Deviating from the exemplary embodiment, there are also further variations anten conceivable. For example, both control elements could also be simple acting and spring-loaded, being to Ar processing only one type of printing required. The most The second type of pressure available for the pressure generator could then be used acceleration of the return of the control elements in their discharge position, d. H. for quick system or ventilation be exploited.

Furthermore, the significant differentiation of the An speech thresholds instead of in the overpressure range or in addition to this is also in the vacuum range. Beyond that combinations of the variants are also possible. When executing Such a combination is essential for its functionality mainly on the fact that when actuating an actuator with a "wrong" type of printing undesirable side effects can be reliably prevented, as described above for the TSH control elements with regard to their application of Un terdruck and for the ZVA control elements with regard to the Be surcharge with higher overpressure was described.

Claims (13)

1.Pressure supply system, in particular in a motor vehicle, for at least two actuating elements which can be acted upon at the same time by a pressure generator for the pressure types positive pressure and negative pressure with the same pressure type, each with its own actuator for different functional purposes, which can be moved independently of one another, for at least two
wherein the first control element as part of a central locking processing system fulfills its purpose at a first pressure level and the second control element fulfills its purpose at a second pressure level, characterized
that the pressure generator ( 2 ) which can be regulated by means of at least one pressure sensor (DS) for generating different pressure levels with modulatable pressure by means of at least one first control switch ( 7 ) assigned to the central locking system (ZVA) for the joint operation of a plurality of identical first actuating elements ( 5 ) with over low pressure and low pressure can be activated alternately,
that the second actuating element ( 6 ) is part of a door closing aid device (TSH), wherein the pressure generator can be activated by means of at least one control switch ( 8 ) assigned to the second actuating element of the door closing aid device (TSH) for operating at least this second actuating element ( 6 ) with an overpressure of higher levels is. 2. Pressure supply system according to claim 1, characterized in that the first actuating element ( 5 ) is designed as a double-acting, with positive and negative pressure bistable working element with a working chamber. 3. Pressure supply system according to claim 1 or 2, characterized in that the second actuating element ( 6 ) is designed as a single-acting, working only with one type of pressure and with spring force in a discharge position prestressed working element. 4. Pressure supply system according to claim 1, 2 or 3, characterized in that the two control elements ( 5 , 6 ) are arranged separately from each other in their own housing. 5. Pressure supply system according to claim 1 or 4, characterized in that the first actuating element ( 5 ) and its actuator ( 5 S) by supplying the induction system ( 3 ) with the first Druckni level of the pressure generator ( 2 ) can be brought into an end position, the far Actuating element ( 6 ) and its actuator ( 6 S), however, is not movable, and that the second actuating element ( 6 ) can only be moved when the induction system ( 3 ) is supplied with the second pressure level, the first actuating element ( 5 ) not being above it assumed final position is movable. 6. Pressure supply system according to claim 1 or 5, characterized in that an actuator of each actuating element ( 6 ) from a plurality of second actuating elements ( 6 ) with a lock lever of an assigned lock to support the closing of this lock ses is decoupled and that a switchable valve ( 9 ) is connected in a feed line ( 4 ) between the introduction system ( 3 ) and every second control element ( 6 ), which connects the second control element ( 6 ) only in positions of the lock that differ from the closed position (rotary latch 10 ). and the introduction system ( 3 ), in the closed position of the lock, however, interrupts this connection. 7. Pressure supply system according to claim 6, characterized in that the valve ( 9 ) via a gear with a lock component of the castle (rotary latch 10) coupled and mechanically switchable by this. 8. Printer supply system according to claim 6, characterized in that the valve ( 9 ) is electromagnetically switchable and can be activated by a signal of a certain lock position detecting electrical switch (control switch 8 ). 9. Pressure supply system according to claim 8, characterized in that a delay circuit for the temporary holding of the Ven valve ( 9 ) is provided in the switched position after the disappearance of the electrical activation signal. 10. Pressure supply system according to claim 7 or 8, characterized in that the valve ( 9 ) is a rotary slide valve. 11. Pressure supply system according to claim 1 or 5, characterized in that the first actuating element ( 5 ) can be acted upon in some cases with the higher pressure level if the lower pressure level is insufficient for its actuation. 12. Pressure supply system according to claim 1 or 2, characterized, that both control elements are double-acting. 13. Pressure supply system according to claim 1, characterized in that in the induction system ( 3 ) at least one connection for a leak test is provided by means of an external test and diagnostic device.