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. 14, 1991
Filed:
May. 03, 1990
Applicant:
Inventors:
Gregory P Gee, Drayton Plains, MI (US);
Edward J Martin, Luxembourg-Belair, LU;
David P Prawdzik, Holly, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01M / ;
U.S. Cl.
CPC ...
731182 ; 7320418 ;
Abstract
A mass air flow meter has a time lag which varies according to the air flow rate. A digital filtering method enhances the raw meter output signal by calculating a correction term based on varying time constants which are dependent on the instantaneous raw signal. The correction term is added to the raw signal. Alternatively first and second order time constants are used to calculate first and second order correction terms.