DIGITAL FILTER FOR AN EVENT DRIVEN ENGINE CONTROLLER HAVING A VARIABLE SAMPLE RATE
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Oct 19, 2011
filing date -
Oct 19, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of implementing a digital filter in an event driven engine controller configured to sample an analog signal at a sample rate dependent on a time interval between engine events such as the time interval between pulses from a crank sensor signal. Since the sample rate is variable, the filter coefficients in the digital filter need to be adjusted or updated in response to changes in the sample so that the filter characteristic or transfer function remains consistent even though the sample rate varies.
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