Self contained multi-function engine monitor and timer for providing engine running time, job time, service time and tachometer functions
First Claim
Patent Images
1. An engine monitor for an internal combustion engine having at least one spark plug comprising:
- a substantially weather resistant case;
a spark detector within the case capacitively coupled to the engine through the case and having an input terminal, located adjacent to an outside wall of the case, and responsive to electro-magnetic radiation produced when the spark plug is fired;
a clamp on an outside wall of the case including a channel for forming a loop at the end of an antenna wire close to the input terminal for capacitively coupling a spark signal from the antenna wire through the case to the input terminal; and
a clock within the case, responsive to the spark detector for accumulating running time while the engine is running.
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Abstract
An engine monitor includes, in a self-contained preferably sealed unit, a spark sensor, inductively and capacitively coupled through the case to a spark pick up wire, a timer, and a running time detector, responsive to inputs from the spark pick up to provide total running time, job time, and service time metering. Preferably, storage means are included for storing maximum RPM and spark mode data, that is, data indicating the number of firings per RPM for the particular engine, as well as a preset service interval and one or more auxiliary timers.
67 Citations
28 Claims
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1. An engine monitor for an internal combustion engine having at least one spark plug comprising:
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a substantially weather resistant case; a spark detector within the case capacitively coupled to the engine through the case and having an input terminal, located adjacent to an outside wall of the case, and responsive to electro-magnetic radiation produced when the spark plug is fired; a clamp on an outside wall of the case including a channel for forming a loop at the end of an antenna wire close to the input terminal for capacitively coupling a spark signal from the antenna wire through the case to the input terminal; and a clock within the case, responsive to the spark detector for accumulating running time while the engine is running. - View Dependent Claims (2, 3)
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4. An engine monitor for an internal combustion engine having at least one spark plug comprising a substantially weather resistant case;
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a spark detector within the case capacitively coupled to the engine through the case for detecting the presence of an electrical signal produced when the spark plug is fired; a clock within the case responsive to the spark detector for accumulating running time while the engine is running; a display within the case for displaying the running time of the engine; means responsive to the spark detector for determining the RPM of the engine and displaying the RPM on the display; and a switch for switching the display between running time and RPM. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. An engine monitor for an internal combustion engine having one or more spark plugs comprising:
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a first input capacitively coupled to an engine and responsive to signals from the one or more spark plugs for generating an electrical signal each time a spark plug connected to the input fires; a clock for producing timing signals; a tachometer coupled to the first input and the clock for determining the RPM of the engine; a timer coupled to the clock and responsive to the first electrical signal for accumulating the timing signals while the electrical signal is present to provide an output representing the running time of the engine; a second timer coupled to the clock for accumulating timing signals, and a reset control for setting the second timer to zero; and a display coupled to the timer and the tachometer for displaying the running time and the RPM of the engine. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for monitoring the running time of an engine that includes a spark plug that fires only when the engine is running, comprising:
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providing a free running clock; capacitively coupling a detector to the engine and to said spark plug for detecting when the spark plug fires; and accumulating time from said free running clock as running time only while the detected electromagnetic radiation indicates that the engine is running. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification