| 摘要 |
A control system 10 for a central locking arrangement comprising at least one locking mechanism (not shown) and a respective motor 14 for operating the or each locking mechanism. Upon initiation of a lock/unlock operation, the control system 10 sends an energising pulse 12 to the motor 14 so as to operate the locking mechanism. The motor 14 includes a 50% stroke switch (not shown) which sends a signal to the control system 10 via feedback connection 16 to indicate that 50% of the lock/unlock operation has been completed. The control system calculates the time taken for 50% of the operation to be completed and adjusts the pulse duration accordingly so as to ensure full stroke operation, while minimising energised stall conditions. In an alternative embodiment, the control system 10 checks whether a signal has been received from the stroke switch after 0.1 seconds from initiation of a lock/unlock operation. If a signal has been received, it maintains the pulse until total pulse duration is 0.4 seconds. If not, it maintains the pulse until total pulse duration is 0.7 seconds. <IMAGE>
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