| 摘要 |
A tracking unit signal filter (10) for a vehicle, typically tractor/trailer combinations, having at least one signal input (15-17) for receiving a respective signal A, B or C indicative of a respective vehicle parameter eg. signal C for sensing tractor/trailer coupling, and processor means (28) operable to pass the signal C after a predetermined time delay TC, if said signal is stable, and which is also operable to maintain said stable signal C if the signal is interrupted for less than a predetermined time interval tc.
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