SOC signal analysis
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United States of America Patent
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-
Mar 24, 1987
Grant Date -
N/A
app pub date -
Mar 26, 1986
filing date -
Mar 26, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
According to the invention, the time for start of combustion in an engine cylinder is provided by disposing a sensor in the combustion chamber of the cylinder, said sensor providing a signal indicative of the amplitude/time of the combustion event within the cylinder. Two signal levels are measured, a first level which is above the noise in the signal and a second level which is below the maximum amplitude of the signal which may be attenuated by carbon buildup on the sensor. By extrapolating backwards from these two sensed levels, a reference time for start of combustion is calculated.
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