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:
Feb. 01, 2005
Filed:
Mar. 12, 2002
Mary B. Mccoy, Fayetteville, TN (US);
Larry Hiltunen, Rochester Hills, MI (US);
Simon Makar, Shelby Township, MI (US);
Rafael Cobas-asensio, Jalisco, MX;
Jason Mucha, Shelby Township, MI (US);
Changhong Zhang, Rochester Hills, MI (US);
Mary B. McCoy, Fayetteville, TN (US);
Larry Hiltunen, Rochester Hills, MI (US);
Simon Makar, Shelby Township, MI (US);
Rafael Cobas-Asensio, Jalisco, MX;
Jason Mucha, Shelby Township, MI (US);
Changhong Zhang, Rochester Hills, MI (US);
Siemens VDO Automotive Corporation, Auburn Hills, MI (US);
Abstract
A fuel injector system () calculates a first derivative filtered signal and a second derivative filtered signal from an unpowered spool valve coil signal. When the spool valve () reaches the end of travel, either open or closed position, a flat slope f is generated on the falling edge of the bell shaped signal. The second derivative provides a readily apparent determination of when the steep slope occurs. A comparator () thereby need only determine when the second derivative is zero to identify that the spool valve has reached the end of travel.