DE4205271C1 - Control circuit for central locking installation - uses switch to change potential to change state of control switch for remote operation of motor vehicle doors or boot - Google Patents

Abstract

A circuit is provided for matching of importance at the common input of the central control circuit, of the wireless remote operating control signals transmitted from a transmitter to at least one receiver and led to the control unit. The central control circuit (3) has a single input (3F, 3B, 3H) for each control circuit (1), influenced across a potential change, by the change-over of the control switch (1) or the assigned control lead (2) between opposing poles of the voltage source. With several inputs (3F, 3B, 3H), only one of them is the common input (3F). An electrical matching circuit (7-0) is provided between the control unit (6) and the central control circuit (3), which matches a signal path at the output of the control unit (6) of the remote operation to the signal upon changeover of the control switch (1) connected to the common input. An output (9A) of the matching circuit (7-9) is connected to the control lead (2) and the common input of the central control circuit (3) via a logic linking circuit (4), for reciprocal electrical locking by control signals, activated by a control circuit and by a remote control. ADVANTAGE - Maintains information ICs of central control circuit. Additionally, remote control unit can be connected.

Description

The invention relates to a control circuit with the Features of the preamble of claim 1.

A control circuit with these features is known (DE 40 06 122 A1), which includes a central locking system (ZVA) controls and a central control circuit with common inputs for generated by switches and for wireless, e.g. B. by means of In infrared carrier waves, transmitted remote control signals includes.

The switches are in this control circuit as a single-pole button switch executed, and the central control circuit has only two control inputs, one for locking, one for entry control signals necessary for the normal operation of the ZVA in Change to a certain, equal potential. It is a separate control unit for evaluating and adjusting the Remote control signals are provided, which at least one NEN code comparator and amplifier includes and also an adapt solution of the wirelessly transmitted signals to the needs of the on central control circuit.

The details of signal matching are given in the However, the document was not discussed further.

It is also an electrical control circuit for a central locking system known (EP 04 60 986 A1), in which also side-by-side key-operated control switches and one not Remote control device shown are used can. The control switches used there have three switches positions over at least two control lines one all Ver control switch together with a central control circuit binding data bus and transmitted by different electrical potentials (voltage levels one at each control switch provided voltage divider) from each other are cash. The remote control device is there via a separate input connected. It is not disclosed how the different signals from control switches and Fernbe service to be internally matched.

By installation in Zen-made and manufactured by the applicant tral locking system (ZVA) equipped vehicles of construction series W 124 and z. B. from DE 40 32 613 C1 of the applicant Another ZVA design is also known, in the purpose of more  position control provided three control switches and each a single control line with an associated input of Central control circuit are connected. The control switches are designed as a bistable changer, the ZVA by poten tial change from plus to ground (lock) or vice versa (ent lock) controlled at the inputs of the central control circuit becomes. They are operated by the lock cylinder switchable, but are built into ZVA control elements, so at the end of each ZVA operating cycle a uniform Potential state at the three inputs of the central control panel tion is present.

The control switches that are not operated manually are therefore switched on the control elements tracked so that the radio to be executed tion affects the control switch signal transmitter.

A remote control of the central locking is for this driving have not been provided for.

The applicant's other vehicle series (R 129, W 140) used remote control with infrared code word transmission proven itself. Your control unit - that on the outside of the vehicle attached receivers downstream - has an output signal with tri-state behavior that directly the central tax circuit is fed to the ZVA. However, this contains zen tral control circuit different from that mentioned above a microchip that also directly evaluates the tri State signals.

The aforementioned central control circuit with potential change Control of the ZVA essentially includes one from a customer specific IC (integrated circuit) existing computing unit. Should also be inexpensive, d. H. building on the existing one hardware, a remote control are offered the desired linkage of different control signals  types (switch / remote control) to meet several conditions len.

During the execution of the function, the on do not change the current state of the functional unit to ensure full implementation.

Manual countermeasures are possible, e.g. B. can be a current ZVA locking cycle at any time by a ge actuation of a locking cylinder in the unlocking meaning canceled or reversed.

Furthermore, of course, under no circumstances can the link Short circuit are caused, and the respective passive signal encoder must be disabled to avoid undefined states - for example, if both signal transmitters overlap - to ver avoid.

The invention has the task of a generic control scarf training so that while maintaining the customer-specific ICs of the central control circuit additionally a remote control can be connected.

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

In order to make no changes in the central control circuit of the ZVA need an adjustment of the output signal of the Fernbe serving to their usual (potential change) input signals made what for one own Input for the remote control and secondly a logical evaluation of signal levels Locking the signal generator, i.e. by means of a control switch triggered signals and triggered by remote control possible.  

The characteristic features of the subclaims give advantage sticky developments of the control circuit according to the invention.

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

Show it

Fig. 1 is a block diagram of the interconnection of the Fernbedie voltage initially gear with the existing control switching means,

FIG. 2 shows a circuit diagram for the block diagram according to FIG. 1.

In a highly schematic block diagram, FIG. 1 shows the essential components of a circuit for combining a remote control signal input IR with a control switch signal input FT in a central locking system (ZVA) for a vehicle.

In the prior art FT, with which a control switch 1 in the form of a bistable changer - z. B. by means of a lock cylinder, not shown, in the driver's door switchable between plus and ground - is connected via a control line 2 , an input of a central control circuit (hereinafter ZS) 3 . These are arranged via output lines 3 A, not shown, control elements of the ZVA, which, for. B. elec trically or electropneumatically operated in the known manner.

Here, however, the control line 2 is initially led to an input of a logic block 4 , the output 4 A of which is in turn connected directly to an input 3 F of the ZS 3 . The latter has two other inputs, indicated by 3 and B 3 H, which is not shown with, the control switch erschaltern 1 equivalent STEU, z. B. in the passenger door and on the boot lid of the vehicle, are connected via control lines.

The remote control of the ZVA here also has three receivers 5 shown as Fototran sistors, which enable multi-point remote control of the ZVA and are all connected to a control unit 6 . This contains a comparator and evaluation device which decodes each signal arriving via a receiver 5 , here an infrared signal, a handheld transmitter or infrared key, and compares it with a stored pattern.

Only on receipt of a signal that can be recognized as suitable does a control signal go to the ZVA via an output 6 A of the control device 6 , this control signal having a tri-state behavior, ie the signal level is normally at a certain voltage level (e.g. + 6 V high-resistance) and can deviate from this for certain short periods (600 ms) upwards (+12 V) or downwards (0 V). The deviating voltage levels or their starting edges can be detected exactly and form the actual control signals. Due to the existing design of the central control circuit, it is not possible to apply it directly to one of its three inputs.

The output 6 A of the control unit 6 is now connected to an impedance converter 7 . Its output 7 A is branched to an amplifier 8 with an output 8 A and to a pulse generator 9 with an output 9 A. The output 8 A forms the already mentioned remote control signal input FT, which is connected to a second input of the logic block 4 .

The logic block 4 enables a mutual electrical locking of the inputs fed to it by logically combining signal levels.

The output 9 A of the pulse generator 9 is also connected to the logic block 4 and provides a temporary output signal, which reliably prevents mutual interference or interference of the signal inputs FT and IR.

The circuit diagram according to FIG. 2 now specifies an embodiment for the block diagram from FIG. 1. As can be seen, the control line 2 is connected to an input of a NAND gate 4.1 (4093), which forms a first component of the logic block 4 and to the second input of which a first output 9.1a of a monoflop 9.1 is connected. The latter is an integral part of the pulse generator 9th

The output of the NAND gate 4.1 is connected to an input of a further NAND gate 4.2 , the second input of which is connected to an output of a third NAND gate 4.3 . The output 4 A of the NAND gate 4.2 is connected according to FIG. 1 to the input 3 F of the ZS 3 .

A first input of the third NAND gate 4.3 is connected to a second output 9.1b of the monoflop 9.1 , while a second input of the same NAND gate is connected to an output of a Schmitt trigger 8.1 (e.g. LM 2902 or LM 2904 , i.e. OP -The stronger in Schmitt trigger function) is connected.

The configuration of the logic block 4 shown with three structurally NAND gates is drawn for the sake of component standardization; it would also be possible to provide an AND gate instead of NAND gates 4.1 and 4.3 and an OR gate instead of NAND gate 4.2 .

The output 6 A of the control unit 6 of the remote control is connected to a first (negative) input of an operational amplifier 7.1 (likewise, for example, LM 2902 or LM 2904 ), with one formed by resistors R 1 and R 2 On-board voltage of the vehicle-connected voltage divider, a quiescent potential is provided at this amplifier input.

The reference voltage of the amplifier 7.1 is formed by a white direct voltage divider, also connected to on-board voltage, from resistors R 3 and R 4 .

The quiescent potential set by R 1 and R 2 corresponds to the reference voltage from R 3 and R 4 . A resistor R 5 bridging the amplifier 7.1 is never derohm in relation to R 1 and R 2 and determines the input impedance of the amplifier 7.1 . If a current flows through R 5 , there is a corresponding voltage level at the amplifier output.

R 1 and R 2 must have a low resistance to the tri-state behavior of the output 6 A; the idle current defined by them may not exceed 0.3 mA to protect the limited capacity of the on-board voltage source.

On the one hand, a further voltage divider consisting of resistors R 6 and R 7 is connected to the output 7 A of the amplifier 7.1 , the output signal of the amplifier 7.1 reaching an (positive) input of the aforementioned Schmitt trigger 8.1 via R 6 . This also receives a reference voltage from a voltage divider formed from resistors R 8 and R 9 .

On the other hand, the input of the monoflop 9.1 is connected to the output 7 A via a capacitance C. In the idle state, this is also set to a defined input potential by means of a voltage divider comprising resistors R 10 and R 11 .

The monoflop is connected as a positive edge triggered univibrator. Its output pulse must be present until a complete operating cycle of the ZVA is safely completed after activation via remote control or control switch, ie for approx. 5 seconds. In the idle state, that is with the range defined by R 10 and R 11 input potential, is located on the output 9.1 a a HIGH level, that is logic "1", and on the output b 9.1 a LOW level, that is logic "0".

If the signal at 6 A oscillates positively from the idle state (upper "half-wave" of the tri-state signal), the impedance converter 7 converts this signal into a negative pulse at the output 7 A. Accordingly, a negative decay at 6 A becomes a positive pulse at output 7 A. Both pulses are of limited duration and each have a positive edge. With a positive impulse it runs ahead, with a negative impulse it runs after.

The capacitor C is used for AC voltage coupling of the mono flop to the 7 A output, which only evaluates the positive edges of the signal at the 7 A output. Through R 10 and R 11 , the input of the monoflop 9.1 is set to a level of approximately 1.5 V, which enables reliable detection of positive input signal edges.

This means that the monoflop 9.1 is triggered by both a positive and a negative pulse at 7A (in the latter case with a slight delay compared to the start of the pulse) and then the signal state at its two outputs for the specified time constant reverses. When the monoflop is set, there is a LOW level on output 9.1 a, ie logic "0", and a HIGH level, ie logic "1" on output 9.1 b.

In the idle state of monoflop 9.1 (output 9.1 a HIGH), NAND gate 4.1 is enabled for both states of switch 1 ; The control of the ZVA is possible in the conventional way.

When the monoflop 9.1 (output 9.1 a LOW) is set, which only occurs for a limited time after receipt of a remote control signal, the NAND gate 4.1 blocks any effect of a switching operation at switch 1 .

In contrast, the NAND gate 4.3 is locked in the idle state of the mono flop 9.1 , however, unlocked in the set state.

In this circuit, the Schmitt trigger 8.1 only serves as a buffer or holding element for the respective logic level of the signal at 7 A; this is necessary above all with regard to the aforementioned delayed triggering of the monoflop 9.1 in the case of negative switching pulses at 7 A. Otherwise it could happen that the pulse level has already disappeared before the monoflop is set and the NAND gate 4.3 has been activated. The NAND gate 4.2 only performs a logical reversal of the inputs fed to it; a level "HIGH" from switch 1 is z. B. on the NAND gate 4.1 to LOW, on the NAND gate 4.2, however, again converted to HIGH. This configuration is the result of a conversion under the de Morgan law; de facto here is the combination of two AND gates and one OR gate mentioned above.

With the matching circuit discussed above, in be an existing one is particularly simple and cost-effective Remote control unit with an existing ZVA Hardware that is in itself not for a remote control connection was designed to be combined.

Since the inputs of the customer-specific IC in the central control circuit are low-resistance, a driver operation may be necessary if the output of the be written blocks is not sufficient.

Claims (7)

1. Control circuit for a central locking system for Ver closings of doors and / or flaps of a vehicle with a central control circuit, which

• - has inputs connected to control lines and
• - depending on control signals,
• which can be fed to it via at least one common input both from a control switch assigned to a mechanical locking point of a door or flap and from a control device of a remote control device,
  operates the locking elements assigned to the locks in the unlocking or locking direction,

A circuit for adapting remote control signals transmitted wirelessly from a transmitter to at least one receiver and directed to the control device to the requirements of the common input of the central control circuit is provided, characterized in that the central control circuit ( 3 ) for each control switch ( 1 ) has a single input ( 3 F, 3 B, 3 H) which can be influenced via potential change by switching the control switch ( 1 ) or the associated control line ( 2 ) between opposite poles of a voltage source, with several inputs ( 3 F, 3 B , 3 H) only one of these is the common input ( 3 F),
that between the control unit ( 6 ) and the central control circuit ( 3 ) an electrical adaptation circuit ( 7 , 8 , 9 ) is provided, which a signal curve at the output of the control unit ( 6 ) of the remote control to the signal curve when switching the control switch connected to the common input ( 1 ) adapts, and
that an output ( 9 A) of the adaptation circuit ( 7 , 8 , 9 ) with the control line ( 2 ) and the common input of the central control circuit ( 3 ) via a logic logic circuit ( 4 ) for mutual electrical locking by ter control switch and by remote control triggered control signals is connected. 2. Control circuit according to claim 1, characterized in that the adaptation circuit comprises an impedance converter ( 7 ; 7.1 ) in order to implement a control signal supplied to it by the control unit ( 6 ) after receipt of a wirelessly transmitted control signal, of a defined, non-zero rest potential tri-state input signal that can be swung out on both sides into defined positive or negative voltage levels. 3. Control circuit according to claim 1 or 2, characterized in that the adaptation circuit comprises a trigger signal which can be triggered by a remote control control ( 9 ; 9.1 ), the output signal of which is fed into the control line ( 2 ) and logic logic circuit ( 4 ) and a signal transmission from the control switch ( 1 ) via the control line ( 2 ) to the central control circuit ( 3 ) is prevented for a certain period of time. 4. Control circuit according to claim 1 or 2 or 3, characterized in that the logic combination circuit ( 4 ) is constructed from three identical NAND gates ( 4.1 , 4.2 , 4.3 ), the outputs of two NAND gates ( 4.1 and 4.3 ) are brought together at the inputs of the third NAND gate ( 4.2 ). 5. Control circuit according to claim 1, 2 or 3, characterized in that the logic combination circuit ( 4 ) consists of two AND gates and an OR gate, the outputs of the two AND gates being brought together at the inputs of the OR gate . 6. Control circuit according to claim 3, characterized in that the pulse generator ( 9.1 ) can be triggered by positive switching edges of an input signal and that the adaptation circuit comprises a buffer ( 8.1 ) which maintains an input level supplied to it for a certain period of time at its output.