Automotive engine signal digitization
First Claim
1. Apparatus for digitizing a cyclical automotive cylinder ignition signal having a maximum value occurring at spark and varying frequency and amplitude thereafter, comprising:
- sensor means, for providing a sensed signal indicative of the actual value of an automotive cylinder ignition parameter; and
signal processing means, responsive to said sensed signal, for sampling of said sensed signal at first predetermined time intervals and providing signals indicative of the value of said sensed signal sampled thereat, for comparing each said sampled first interval signal to a predetermined threshold signal to determine a transition occurrence of said sensed signal towards a maximum spark value, for sampling of said sensed signal, following said sensed signal transition occurrence, at said second intervals for a predetermined number of said second intervals and providing signals indicative of the value of said sensed signal sampled thereat, for determining a maximum spark value signal from among said sampled second interval signals, for sampling of said sensed signal, following said predetermined number of second intervals, at said third intervals and providing signals indicative of the value of said sensed signal sampled thereat, said first, second and third intervals being shorter in duration than a fourth predetermined time interval, and for determining a maximum displacement signal during each said fourth interval as the one of said sampled third interval signals sampled during an associated one of said fourth intervals having the greatest absolute value displacement from a maximum displacement signal determined during a preceding one of said fourth intervals.
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Accused Products
Abstract
A vehicle ignition signal is sensed and digitized for subsequent display on a display device, the digitization comprising sampling the sensed signal at a number of predetermined time intervals, all shorter in duration than an interval determined by the display device resolution, to determine a signal transition to a maximum spark value, to determine the maximum spark value, and to determine the sample within each display resolution interval having the greatest absolute value displacement from that of the determined sample from the previous resolution interval, the determined sample and the maximum value sample being displayed on the display device.
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Citations
17 Claims
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1. Apparatus for digitizing a cyclical automotive cylinder ignition signal having a maximum value occurring at spark and varying frequency and amplitude thereafter, comprising:
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sensor means, for providing a sensed signal indicative of the actual value of an automotive cylinder ignition parameter; and signal processing means, responsive to said sensed signal, for sampling of said sensed signal at first predetermined time intervals and providing signals indicative of the value of said sensed signal sampled thereat, for comparing each said sampled first interval signal to a predetermined threshold signal to determine a transition occurrence of said sensed signal towards a maximum spark value, for sampling of said sensed signal, following said sensed signal transition occurrence, at said second intervals for a predetermined number of said second intervals and providing signals indicative of the value of said sensed signal sampled thereat, for determining a maximum spark value signal from among said sampled second interval signals, for sampling of said sensed signal, following said predetermined number of second intervals, at said third intervals and providing signals indicative of the value of said sensed signal sampled thereat, said first, second and third intervals being shorter in duration than a fourth predetermined time interval, and for determining a maximum displacement signal during each said fourth interval as the one of said sampled third interval signals sampled during an associated one of said fourth intervals having the greatest absolute value displacement from a maximum displacement signal determined during a preceding one of said fourth intervals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for digitizing an automotive engine signal having varying frequency and amplitude, comprising:
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sensor means, for providing a sensed signal indicative of the value of an automotive engine parameter; and signal processing means, responsive to said sensed signal, for sampling the value of said sensed signal at first predetermined time intervals and providing signals indicative of the value of said sensed signal sampled thereat, said first interval being shorter in duration than a second predetermined time interval, and for determining a maximum displacement signal during each said second interval as the one of said sampled first interval signals sampled during an associated one of said second intervals having the greatest absolute value displacement from a maximum displacement signal determined during a preceding one of said second intervals. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification