Tachograph including means for recording engine speed
AssigneeVeeder-Root Company
InventorFrank Clish
Life of this patent
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Abstract
A tachograph includes stylus recorder (4,5,6) responsive to a signal related to engine speed for recording an indication of the engine speed on a chart (1). The stylus recorder is conditioned to provide a bar trace having different and readily distinguishable levels. Each level represents a threshold of engine speed which indicates that the engine speed is at or below the respective threshold and within a predetermined range. Threshold selector (8 or 9) are provided for adjusting the relationship between the levels and the predetermined thresholds so that the bar trace levels stay substantially the same but represent engine speed thresholds which are adjustably predetermined by the threshold selector.
Claims9
In a vehicle tachograph for recording vehicle engine speed and comprising chart drive means for driving a tachograph chart with respect to time and recording means operable for receiving signals representing engine speed and for recording an indication of engine speed in the form of a bar trace on a tachograph chart as it is driven by the chart drive means, the improvement wherein the recording means is operable to record a bar trace with a plurality of different, readily distinguishable levels, each level representing a threshold of engine speed, said threshold indicating that said engine speed is at or below the respective threshold and within a predetermined range, and selector means for selectively setting said thresholds so that the bar trace levels stay the same but represent different engine speed thresholds.
Dependencies are inferred from the claim text.