| 摘要 |
A safety system the structure of which is based on a microcontroller (1) which carries out readings of the orders to open (LA) and to close (LC), (together with the speed (V) of the vehicle), a relay for the order to close (2) governed by a transistor (5), and a relay for opening (3) governed by a transistor (6), these two relays and their transistors (5) and (6) being powered by another transistor (7). The system carries out periodical supervision thanks to clock signals generated by the microcontroller (1) of the state of the switching transistors, checking that the orders given are definitive and coincide with the action that has been brought about, entering if this is not the case into a routine of internal stoppage of the microcontroller (1), shutting off motor traction, and bringing the relay contacts into a safe position which prevents the untimely opening of an automatic door. In the case of a fault arising in the microcontroller the relays are deactivated. <IMAGE> |
