Electric type speed meter

Details Electric type speed meter Electric type speed meter

G - Physics

01

P

73/62, 340/148.7

G01P 3/42 (2006.01) G01P 3/489 (2006.01)

Patent

CA 1158455

ABSTRACT OF THE DISCLOSURE The invention provides an electric speed meter com- prising pulse generating means arranged to generate a pulse signal dependent on vehicle speed, a control circuit arranged to count the number of output pulses of the pulse generating means in successive predetermined time intervals, determine the differ- ence between successive counts, the sign of said difference, and generate a number of output pulses corresponding to said difference, a pulse motor driving circuit arranged to distribute in sequence said output pulses of the control circuit to plural poles of a pulse motor so as to rotate the pulse motor in either a regular forward direction or the reverse direction according to the sign of said difference, and an indicator having a pointer arranged to be moved by the pulse motor to indicate the speed.

386335

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