Measuring and testing – Internal combustion engine or related engine system or... – Compression
Patent
1980-05-09
1981-05-12
Myracle, Jerry W.
Measuring and testing
Internal combustion engine or related engine system or...
Compression
G01M 1500
Patent
active
042664276
ABSTRACT:
Method and apparatus for timing combustion events in the combustion chamber of an internal combustion engine wherein a piezoelectric transducer is utilized to develop a signal corresponding to the first derivative of pressure within the cylinder being monitored. A signal processing circuit detects that change in polarity of the first derivative signal which occurs at the transition between compression and expansion of cylinder volume during the combustion cycle of the piston. Circuitry is provided for effectively disregarding all other polarity changes or "zero crossings" of the transducer output signal which are not related to the achievement of the top dead center position by the piston within the cylinder. This directly derived indication of a transition from compression to expansion in the combustion chamber is combined with other timing signals for the monitoring or controlling of injection or ignition timing for the engine.
REFERENCES:
patent: 3183708 (1965-05-01), Roddick
patent: 3389599 (1968-06-01), Beale
patent: 3943759 (1976-03-01), Kato et al.
Creative Tool Company
Myracle Jerry W.
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