Tachometer kit with alternator pick up

Details Tachometer kit with alternator pick up Tachometer kit with alternator pick up

1984-02-29

1988-03-22

Chin, Peter

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73116, 73119R, 324166, 324167, 324173, 324176, 324179, 324208, G01P 342

Patent

active

047320346

ABSTRACT:
A vehicle tachometer kit including a pick up coil that is adapted to be mounted on the outside of the vehicle's alternator to sense its rotating field without any disassembly. An induced signal in the coil from alternator field leakage provides the normal input to a user calibrated r.p.m. display driving circuit in the tachometer that can be calibrated for different alternators and drive pulley ratios without another tachometer by selectively applying a simulated input reference signal to the display driving circuit and adjusting the r.p.m. display until a scheduled ratio is achieved between the displayed r.p.m. and the reference signal.

REFERENCES:
patent: 2887654 (1959-05-01), Strassman et al.
patent: 3404339 (1968-10-01), Mitchell
patent: 3983480 (1976-09-01), Meserow et al.
patent: 4138642 (1979-02-01), Mohr
patent: 4225006 (1980-09-01), Murray
patent: 4339713 (1982-07-01), Kago et al.
patent: 4503509 (1985-03-01), Becker et al.
Elektor, vol. 2, No. 9, pp. 916-920 (Sep. 1976).

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