The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 1983
Filed:
Jan. 26, 1981
Mark K Krage, Royal Oak, MI (US);
John H Lienesch, Bloomfield Hills, MI (US);
Robert M Storwick, Rochester, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
While the crankshaft of an internal combustion engine is rotating, an encoder device produces a reference signal pulse and a series of encoder signal pulses during each crankshaft revolution and a microwave signal of a substantially constant amplitude and frequency is coupled through a microwave probe into the combustion chamber of a selected reference cylinder of the engine. The microwave signal waveform reflected from the reference cylinder combustion chamber while the reference cylinder piston approaches, passes through and moves away from the top dead center position during the compression and power strokes is processed to determine the encoder signal pulse count at which the line of symmetry thereof, the piston top dead center position, occurs. Initial ignition timing angle is then set relative to the encoder signal pulse count corresponding to the piston top dead center position.