Tachometer system picking up ignition signals from vehicle ground
First Claim
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1. A system for detecting a rotational speed of an engine in a vehicle, the system comprising:
- a probe for connection to a vehicular ground to detect signals emitted from an ignition system of the engine; and
a tachometer circuit operatively connected to the probe for identifying the detected signals representing ignition sparks of the engine and for providing an output representative of the rotational speed of the engine based on the identified signals, the tachometer circuit having a circuit common reference.
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Abstract
A ground pick-up tachometer for detecting a rotational speed of an engine in a vehicle includes a probe arranged for connection to a vehicular ground to detect signals emitted from an ignition system of the engine. A tachometer circuit is operatively connected to the probe to identify the detected signals representing ignition sparks and provide an output representative of the rotational speed of the engine based on the identified signals. The tachometer circuit includes a circuit common reference, separate from the vehicular ground.
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Citations
14 Claims
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1. A system for detecting a rotational speed of an engine in a vehicle, the system comprising:
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a probe for connection to a vehicular ground to detect signals emitted from an ignition system of the engine; and a tachometer circuit operatively connected to the probe for identifying the detected signals representing ignition sparks of the engine and for providing an output representative of the rotational speed of the engine based on the identified signals, the tachometer circuit having a circuit common reference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of detecting a rotational speed of an engine in a vehicle, the method comprising:
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connecting a probe to a vehicular ground to detect signals emitted from an ignition system of the engine; providing a circuit common reference; identifying the detected signals representing ignition sparks emitted from the ignition system of the engine; and providing an output representative of the rotational speed of the engine based on the identified signals. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification