CAR SPEED DETECTING METHOD

摘要

PURPOSE:To obtain an inexpensive device which requires no operation, by obtaining a gate time being proportional to a car speed, counting the number of clock pulses in this gate time, and obtaining a pulse being proportional to the car speed. CONSTITUTION:A frequency divider 2 divide a pulse from a car speed pulse generator 1, and obtains T1 being the first gate time. A monostable multivibrator 3 obtains T2 being the second gate time which is set by rise of the pulse from the frequency divider 2 and is reset after a constant interval of time. An RS flip- flop 4 obtains T3 being the third gate time which is set by fall of the pulse from the frequency divider 2 and is reset by fall of the pulse from the monostable multivibrator 3. A car speed signal is obtained by counting a clock in this third gate time.