Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1976-11-03
1978-04-18
Heyman, John S.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
328 48, 328129, 180105E, 307233A, H03K 906
Patent
active
040853730
ABSTRACT:
A speed governing system utilizing a magnetic pickup for sensing speed with a frequency-to-voltage transducer of the type in which each input signal initiates a counting cycle by a digital counter receiving relatively high, constant frequency input pulses to measure off a predetermined time interval, and characterized in that the output signal from the counter itself forms a variable duty cycle squarewave signal whose dc. or average value varies according to changes in the input signal frequency. The counter output signal also controls termination of each counting cycle. The transducer may include means for converting the transducer output signal to a failsafe level in the event that sensed speed and the input signal frequency become so great that there is an erroneous attempt for the system to stabilize at twice the set point speed.
REFERENCES:
patent: 3050708 (1962-08-01), Van Alstyne et al.
patent: 3226568 (1965-12-01), Samwel
patent: 3564426 (1971-02-01), Anderson et al.
patent: 3944935 (1976-03-01), Plant
patent: 4025868 (1977-05-01), Miki et al.
Heyman John S.
Woodward Governor Company
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