Electronic device for indicating engine speed

Details Electronic device for indicating engine speed Electronic device for indicating engine speed

1978-11-21

1980-09-09

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

324169, 340 52R, G01M 1500

Patent

active

042211263

ABSTRACT:
An electronic indicator device for providing an audible or visible indication when an internal combustion engine to which the device is fitted reaches a predetermined rotational speed so that the driver can, if he wishes, change gear or reduce speed in order to save fuel. The device includes a detector for sensing electrical impulses generated by the engine ignition circuit in operation thereof and for producing an output signal the frequency of which is related to engine speed. This frequency signal is converted to an analogue voltage signal in a frequency-to-voltage converter and the output of the converter is compared with a reference voltage to provide an electrical output signal to a lamp, buzzer or the like when the engine speed reaches the value determined by the reference voltage level.

REFERENCES:
patent: 3781656 (1973-12-01), Glew
patent: 3925753 (1975-12-01), Auman et al.
patent: 3983480 (1976-09-01), Meserow et al.
patent: 3983533 (1976-09-01), Goszyk et al.

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