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:
Jun. 06, 1989
Filed:
Jun. 14, 1988
Applicant:
Inventor:
Mark K Krage, Royal Oak, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01M / ;
U.S. Cl.
CPC ...
731172 ; 364558 ;
Abstract
A method of determining the compression ratio of a cylinder of an internal combustion engine. While the engine is being driven by a prime mover a PV curve is developed which is stored in the memory of a microprocessor. The unswept volume of the cylinder is determined by trying various values of unswept volume in the function PV.sup.n =C and determining which value of unswept volume causes the curve developed by this function to best fit the stored curve. Compression ratio is determined after the unswept volume is determined.