Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1981-09-22
1984-02-07
Krawczewicz, Stanley T.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
G01P 3489
Patent
active
044306121
ABSTRACT:
The present invention is directed to an electric type speed meter which comprises a pulse generating means for generating a pulse signal corresponding to a vehicle speed. A control circuit means counts the number of output pulses of the pulse generating means during predetermined time intervals and discriminates between a positive and negative difference between the number of pulses counted during a predetermined time interval and the number of pulses counted in a preceding time interval. The control circuit means generates a pulse signal corresponding to the difference therebetween. A pulse motor driving circuit applies the output of the control circuit means to a pulse motor for controlling the pulse motor in either a forward or reverse direction. An indicator means is operable in response to the pulse motor for indicating a speed corresponding to the speed thereof.
REFERENCES:
patent: 4083052 (1978-04-01), Metcalf
patent: 4227150 (1980-10-01), Widl
Fukamachi Masaaki
Onitsuka Nobuyuki
Sueyoshi Masahiko
Kabushiki Kaisha Honda Rukku
Krawczewicz Stanley T.
Solis Jose M.
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