Battery tach
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United States of America Patent
Stats
-
Apr 2, 1991
Issued Date -
N/A
app pub date -
Mar 16, 1990
filing date -
Nov 3, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A signal representing the RPM of an internal combustion engine is produced by a signal processor connected to the battery of the vehicle. The signal processor derives an electrical signal from the battery which contains signal components produced by operation of the vehicle ignition system, as well as components from a multitude of other sources such as the voltage regulator, fans, air conditioning and other electrical systems of the vehicle. The signal processor filters and signal processes the signal derived from the vehicle battery to produce a signal having a frequency which is related to the RPM of the engine.
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