DE102007050596A1 - Sensor system for lock cylinder for determining closure and locking condition of door or lock casing, has multiple actuators or acoustic sensors which are placed in core or housing or fitting of lock cylinder - Google Patents

Abstract

The sensor system has multiple actuators or acoustic sensors (B) which are placed in a core or housing (C) or fitting of a lock cylinder (A). The actuators or acoustic sensors are coupled with component in oscillating manner in such a way that a propagation of the generated sound field is enabled by all solid objects coupled together up to the outside of a door. The actuators or the acoustic sensors are designed as vibration engine.

Description

Characteristic for the Operation of access control systems in widely branched buildings is the Request for feedback on the closure and locking status of the doors ("night watchdog function"). Passes the access control system of wirelessly interconnected electronic locking cylinders, This requirement extends to the structural integration the "night watchdog function" in the lock cylinder.

The previous attempts at solution for detecting the closure and locking position of doors see the use of magnetic closing contacts on the door frame or in the strike plate before, however, which mean a high construction cost. Another approach consists in the integration of optical sensors in the lock cylinder or the strike plate, which, however, relatively easy to be manipulated (for example by covering or gluing). But just this low security is a major disadvantage in the operation of electronic locking cylinders, the usual be monitored and controlled wirelessly from a central point should.

The explained above Problem is due to the integration of the sensor in a wireless communicating be solved electronic lock cylinder. The structural system of different vibrationally coupled solid consisting of cylinder, lock case, Door panel, door fittings and door frames forms the physical basis for this.

each individual component has a different natural frequency. Exactly this Effect is now used in the invention to be described to a Statement about the solids involved in the measured resonance frequency meet, d. H. for example, a closed door position to investigate.

The The invention relates to a sensor system, in particular a by a Actuator and a microphone system shown in a lock cylinder, his core, his case or the associated one door fittings is integrated so that one or several acoustic transmitters generate a vibration that points to a solid is coupled.

The resulting wave propagation, bezw. the sound is transmitted to all connected Solids. The term "sound" means mechanical Vibrations and waves of an elastic medium. The medium can Air, water or a solid be.

If a sound source (actuator, encoder), the medium adjacent to it (in this case a solid) stimulates to resonate, arises around the sound source a propagating sound wave, the sound field. Just be informed mentioned, that without a medium, so in a vacuum, no sound field can be generated.

The The sensor system described in the invention generates very specifically a diffuse sound field, which often reflects on the mechanically connected solids, bent, scattered and bundled becomes. In the resulting diffuse sound field are practical many different free sound fields are superimposed statically on each other. For the description of a sound field is the indication of the location and time dependency two sound field sizes necessary - in the Practice mostly pressure and speed (movement speed the particles).

Low Frequencies are becoming common in solids least weakened. The low frequency range is between 20 and 500 Hz chosen very effective excitation frequency of 20 Hz for a solid, so can the transmitted Frequency in the adjacent solid by suitable isolation measures dampened by up to 90 percent become. These insulators are called VIMs or vibration isolation Modules called.

The inventive sensor system let yourself from the principle of operation with those in modern submarines used panoramic sonar or even Plane Position Indication Sonar (PPI) compare.

sensors in lock cylinders are known from various products offered on the market. Next already described above problem of high construction costs or the low burglary security is especially the limited Significance of the determined measurement results disadvantageous. So must for everyone to be detected parameters, such as door position and locking a separate sensor will be installed.

The The operating principle of this sensor system is an electronics to realize which is capable of the generated free sound field to characterize against the recorded diffuse sound field. The defined encoder frequency is used to one - depending on the nature and condition and the closure and Verriegetungszustandes the door - different Receive response frequency. By comparison with a in an electronic library stored empirically Determined response frequencies can each measured signal pattern assigned to a specific state of the door become.

Of the strong signal spacing, which is thus between two different closing positions a door can now be used to authenticate the correct building closure at a certain time from a central control unit to make out.

pictures:

The invention will be described below with reference to 1 to 3 described in more detail.

It demonstrate:

1 the lock cylinder according to the invention with an actuator BEZW. an acoustic transducer and a microphone BEZW. a vibration sensor

2 the propagation of the sound field in the cylinder core and in the vicinity of the cylinder

3 a typical expected frequency distribution on an office door depending on the closed or open state

In 1 there is an embodiment of the lock cylinder (A) according to the invention with a sensor system in plan and section. The acoustic sensor (B) is designed as a vibration motor, as it is known from mobile phones. The acoustic sensor is BEZW to the cylinder housing (C). the door fitting (D), which is usually carried out metallic, coupled in a sound field. Thus, the vibration generated by the encoder can propagate unhindered in adjacent solids BEZW. before it is then reflected on the surrounding solids (lock case, door leaf, etc.), diffracted and bundled. It spreads out over the door leaf, which is usually fixed in the door frame, into the open. The reflection of the entire sound field is recorded by the microphone (E) placed in the cylinder and characterized by the integrated electronics.

In 2 There is a representation of the planned sound field propagation via cylinder (A), lock case (B), door fitting (C), door leaf (D) and door frame (E), as can be expected according to the embodiment of the sensor system.

In 3 there is a representation of the sound field characteristic on the supervision of a room door (A) with built-in lock cylinder (B) in the open and closed state.

Claims (8)

Sensor system for a lock cylinder, characterized in that one or more actuators or acoustic encoders are placed in the core, in the housing or in the fitting of a lock cylinder and vibrationally coupled to the respective component, such that a propagation of the generated sound field over all coupled together solids until to the exterior of the door is made possible. Sensor system for a lock cylinder, characterized in that a or several microphones or vibration sensors in the core, in the housing or in the fitting of a lock cylinder placed and vibrationally with the respective component are coupled so that the Propagation of an actively generated sound field via coupled together solid up to the microphone bezw. Vibration sensor is enabled. Sensor system for a lock cylinder, characterized in that a or several microphones or vibration sensors in the core, in the housing or in the fitting of a lock cylinder placed and vibrationally with the respective component are coupled so that the Propagation of an event-induced sound field over each other coupled solids up to the microphone bezw. Vibration sensor is enabled. Sensor system for a lock cylinder, characterized in that the Actuator or the acoustic encoder is designed as a vibration motor. Sensor system for a lock cylinder, characterized in that the Actuator or the acoustic sensor as electromechanical, piezoceramic, metallurgically active or magnetically induced vibrator accomplished is. Sensor system for a lock cylinder, characterized in that the lock cylinder in DIN standards or comparable dimensions. Sensor system for a lock cylinder, characterized in that a Electronics the input signals according to the type and condition of the measured Analyze the door and with several already stored state and type specific Signal patterns can compare, with the goal, statements about the closure and lock state of the door hold true. Sensor system for a lock cylinder, characterized in that a Electronics detects the number and direction of the cylinder core rotations and characterized together with the recorded signal patterns, with the goal of making statements about the closure and lock state of the door hold true.