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:
Nov. 13, 1984
Filed:
Jun. 20, 1983
Philip A Karau, Anderson, IN (US);
Marshall W Littrell, Fortville, IN (US);
John S Brooks, Anderson, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An internal combustion engine with a spark timing control which varies spark timing to maintain a substantially constant peak combustion pressure timing includes a combustion pressure sensor generating a signal contaminated by high frequency noise and further apparatus which tracks the sensor signal only while it is increasing above a previous maximum and generates an output signal whenever it stops tracking to indicate the timing of a new maximum. Numbers representing the crankshaft rotational positions of the successive signals are stored in a storage element during a crankshaft rotational range in which peak combustion pressure is expected. At the end of the range, the last stored number is used to represent the timing of peak combustion pressure in the spark timing control and the apparatus reset for the next determination.