| 摘要 |
The present invention relates to a system of encoded (5) infrared volume sensors (1) and (2), situated above each car space (10) in an underground car park, in order to make it possible to manage the free and occupied spaces using a microcomputer (15), by knowing their geographical situation in the car park. The data from the sensors (1) and (2) are transmitted in frequency multiplexing by a central unit (12) in a coaxial bus (13). The system also makes it possible to continuously monitor the occupation of preindicated spaces over time and to trigger an alarm if the space becomes free before the limit fixed with the computer. <IMAGE>
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