Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1999-04-07
2000-12-05
Lieu, Julie
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
340541, 340540, 307 102, 367 93, 367 94, 367103, 367104, 342 27, 342 28, B60R 2510
Patent
active
061572934
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to a device for detecting the intrusion of a body into a predetermined space and, more particularly, to a device of this type comprising a transmitter transmitting ultrasound into said space, a sensor which senses the echoes from the transmission by the transmitter into said space in order to deliver a signal representative of said echoes, and electronic means for processing said signal in order to diagnose the possible presence of a moving body in said space.
Such devices are known, designed in particular to trigger an alarm following detection of unauthorized intrusion into a space such as the interior of an automobile vehicle, for example. This is a situation encountered, in particular, when a thief enters by breaking into this interior.
In known detection devices, the ultrasound transmitter and the echo sensor are both mounted in fixed positions, inside the interior. In order to cover the entire volume of this interior optimally, it is then necessary to fix this transmitter and this sensor in positions of compromise between various positions which each provide optimum coverage of only a part of this volume. The result of this compromise is that certain parts are not monitored optimally. Designers are then forced either to focus the monitoring on particularly sensitive regions (that of the steering wheel, the car radio, the glove box, for example) to the detriment of others, or to increase the number of the transmitter/sensor pairs installed in the interior, which solution has the drawback of being expensive.
Further, document EP 0 293 004 discloses an ultrasonic detection device comprising a transmitter and a receiver which are fixed relative to one another, interacting with a turning reflector placed on the transmitter/receiver axis. Although it allows scanning of the plane perpendicular to this axis, such a device involves a moving reflector which is difficult and expensive to produce and adjust, and only allows those echoes produced on surfaces normal to the axis of the incident beam to be returned to the receiver. This limitation makes it problematic to use in a complexly shaped environment such as an automobile vehicle, in which the echoes occur only rarely in the direction of the reflector, thus making the received signal unusable.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to produce a device for detecting the intrusion of a body into a space such as the interior of an automobile vehicle, designed to effectively monitor all of this space while remaining inexpensive to manufacture and install.
This object of the invention, as well as others which will become apparent on reading the following description, are achieved with a detection device of the type described in the preamble of the present description, which is noteworthy in that it comprises means for scanning the space in question with the ultrasound beam out put by the transmitter and means for simultaneously moving the echo sensor so as to optimize the signal
oise ratio of the output of said sensor.
By virtue of the connection thus made between the movements of the transmitter and of the sensor, the device according to the invention produces a signal which allows all of the space to be monitored effectively, and economically, using a single transmitter/sensor pair.
Other features and advantages of the present invention will become apparent on reading the following description and on studying the appended drawing, in which the single FIGURE schematically represents an automobile vehicle equipped with the device according to the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
This FIGURE schematically represents the wheels 21 to 24 of the vehicle 1 which is powered by an engine 3 placed in a compartment 4 separated from the interior 5 of the vehicle by a firebreak partition 6.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The device for detecting intrusion into this interior according to the invention comprises an ultrasound
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patent: 4618948 (1986-10-01), Sakakibara et al.
patent: 4661936 (1987-04-01), Magee et al.
patent: 5438247 (1995-08-01), Kim et al.
International Publication No. WO 92/02831 (Muller et al.), dated Feb. 20, 1992.
Patent Abstracts of Japan No. 60-209348 (Yasunori), dated Oct. 21, 1985.
Greenberg Laurence A.
Lerner Herbert L.
Lieu Julie
Siemens Automotive S. A.
Stemer Werner H.
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