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:
Oct. 11, 1977
Filed:
Jun. 24, 1976
Ronald L Colling, Millington, MI (US);
Myron U Trenne, Utica, MI (US);
Timothy R Schlax, Rochester, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
The output signal pulses of a constant frequency oscillator are counted between successive timing signals, each of which corresponds to a cylinder of an associated internal combustion engine. The total number of pulses counted during each count period is stored and employed to derive an engine speed advance binary code representation of the number of pulse counts corresponding to the predetermined number of degrees ignition spark engine speed advance for the speed at which the engine is operating. Vacuum advance binary code representation of the number of pulse counts corresponding to the predetermined number of degrees ignition spark vacuum advance is also produced and added to the engine speed advance binary code representation. The difference between the sum of the engine speed and vacuum advance binary code representations and the stored total number of pulses counted during the previous count period and the running total of pulses being counted during the present count period are applied to a comparator circuit which produces an output ignition initiating signal upon the detection of an equality. The oscillator circuit output signal pulses are also counted in another counter circuit between successive ignition initiating signals. The total number of pulses counted between successive ignition initiating signals is employed to derive a dwell initiating signal.