Tachometer based on electrical ripple and calibrated by mechanic

Details Tachometer based on electrical ripple and calibrated by mechanic Tachometer based on electrical ripple and calibrated by mechanic

1995-09-01

1997-06-17

O'Shea, Sandra L.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

73115, 731172, 324161, G01P 348

Patent

active

056400861

ABSTRACT:
The tachometer includes a microphone for disposition next to the exhaust of the vehicle and an accelerometer for disposition adjacent to its engine. A selected one of the outputs is connected to an ADC which provides digital samples to a central processing unit. Also, the ripple from the battery is sampled and provided to the CPU. The CPU calculates a constant representing the relationship of the frequencies of the ripple samples and the mechanical samples and responds to the ripple samples and the constant to provide output signals corresponding to the speed of the engine. The speed is displayed.

REFERENCES:
patent: 3603878 (1971-09-01), Himmelstein
patent: 3765233 (1973-10-01), Germann
patent: 3978719 (1976-09-01), Hadden et al.
patent: 4152580 (1979-05-01), LeBouder
patent: 4237371 (1980-12-01), LeBouder
patent: 4263578 (1981-04-01), Fukuhara et al.
patent: 4439721 (1984-03-01), Mura
patent: 5004979 (1991-04-01), Marino et al.
patent: 5087881 (1992-02-01), Peacock
patent: 5216881 (1993-06-01), Anlauf et al.

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