Frequency responsive speed control apparatus

Details Frequency responsive speed control apparatus Frequency responsive speed control apparatus

G - Physics

01

P

340/148, 341/86

G01P 3/54 (2006.01) B60L 3/08 (2006.01) B61L 3/00 (2006.01)

Patent

CA 1043437

Abstract of the Disclosure A speed control apparatus for sensing over speed conditions of a vehicle. A signal source which produces signals at a frequency which are proportional to vehicle speed feeds an electronic high pass filter whose cut-off frequency is variable and settable to a frequency which is proportional to the predetermined speed above which an over speed condition exists. A relay driver is operated in re- sponse to signals passed by the electronic high pass filter to operate a relay. In order to check the cut-off frequency of the high pass filter, a check oscillator is provided which is turned to a frequency slightly in excess of the desired cut-off frequency of the high pass filter. The relay driver operates an electronic switch which intermittently provides the signals from the check oscillator to the elec- tronic high pass filter.

204936

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