Tracking unit signal filter
First Claim
1. A signal filter for a global positioned tracking unit which also transmits data relating to at least one vehicle operational parameter, the filter having at least one voltage signal input for receiving a respective signal indicative of a respective vehicle parameter and processor means operable to pass a parameter signal after a predetermined time delay if said signal is stable, and which is also operable to maintain said stable signal if the signal is interrupted for less that a predetermined time interval, thereby blocking erroneous parameter signals from the tracking unit.
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Accused Products
Abstract
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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Citations
11 Claims
- 1. A signal filter for a global positioned tracking unit which also transmits data relating to at least one vehicle operational parameter, the filter having at least one voltage signal input for receiving a respective signal indicative of a respective vehicle parameter and processor means operable to pass a parameter signal after a predetermined time delay if said signal is stable, and which is also operable to maintain said stable signal if the signal is interrupted for less that a predetermined time interval, thereby blocking erroneous parameter signals from the tracking unit.
Specification