Digital indication type speedometer

Details Digital indication type speedometer Digital indication type speedometer

1980-12-22

1983-01-11

Nelms, David C.

Electricity: measuring and testing

Electrical speed measuring

Speed comparing means

235 92FQ, G01P 348

Patent

active

043684270

ABSTRACT:
A digital indication type speedometer comprising a speed counter for counting speed pulses emitted in proportion to a vehicle speed for a given gate time, an indication register for latching a value to be indicated commensurate to an output from said speed counter and an indicator for indicating the value latched in said indication register is of such an arrangement that a hysteresis processing circuit is provided, which rewrites the value latched in said indication register in accordance with an output of said speed counter only when a difference between the output of said speed counter and the value latched in said indication register is not within tolerance limit upon comparison therebetween, so that response of the indication is excellent during acceleration or deceleration, and no flickering is observed during running at a constant speed.

REFERENCES:
patent: 4151466 (1979-04-01), Boyer et al.
patent: 4204157 (1980-05-01), Javeri
patent: 4243938 (1981-01-01), Bliven et al.

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