Adaptable engine tachometer device

Data processing: measuring – calibrating – or testing – Measurement system – Speed

Reexamination Certificate

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Details

C702S141000, C701S096000

Reexamination Certificate

active

06199027

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to engine monitoring devices, and more particularly to adaptable engine monitoring devices.
SUMMARY OF THE INVENTION
Engine monitoring is used throughout many industries to determine performance of an engine as well as to determine when servicing of an engine is needed. For example, the automotive industry examines such engine characteristics as the revolutions per minute of an engine over a period of time in order to assess the engine's performance and to determine when the engine might need servicing.
Industries use many different engine configurations that can range from one to eight cylinders and from two to four strokes. However, present engine monitoring devices are not adaptable for accurately monitoring these different configurations since they are specifically designed to monitor only one or two engine configurations.
Accordingly, it is a feature of the present invention to provide an engine tachometer device that is adaptable to all configurations of engines. It is another feature of the present invention to provide a device in a self-contained case that can accurately monitor all configurations of engines. It is yet another feature of the present invention to provide engine servicing indications based upon the monitored engine.
In accordance with one aspect of the present invention, an engine tachometer device is provided for determining the revolutions per minute of an engine which generates sparks and has a predetermined configuration. A computer memory is utilized for storing engine configuration data. The engine configuration data associates engine configurations with predetermined equations. An engine configuration selector selects from the computer memory one of the engine configurations which is indicative of the configuration of the engine. An engine characteristic calculator which is connected to the engine and to the engine configuration selector and to the computer memory determines the revolutions per minute of the engine based upon the generated sparks and upon the equation associated with the selected engine configuration.
Additional objects and advantages of the present invention will be apparent from the detailed description of the preferred embodiment, the appended claims in the accompanying drawings, or may be learned by practice of the invention.


REFERENCES:
patent: 3948039 (1976-04-01), Leveraus
patent: 4350952 (1982-09-01), Holt et al.
patent: 4611570 (1986-09-01), Nash
patent: 5353953 (1994-10-01), Sakaemura
patent: 5431134 (1995-07-01), Budde et al.

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