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. 19, 1991
Filed:
Oct. 10, 1990
Charles A Detweiler, Durand, MI (US);
Richard A Schultz, Troy, MI (US);
Lectron Products, Inc., Rochester Hills, MI (US);
Abstract
A vacuum regulator for automotive vehicles of the type having a computer-controlled exhaust gas recirculation (EGR) system. The regulator controls the vacuum signal provided to the EGR valve in accordance with the current signal supplied to the regulator by the engine control computer. The vacuum regulator includes a solenoid structure having a secondary air gap in the flux path of the solenoid at the opposite end of the pole piece from the armature. The flux path across the secondary air gap is divided into a first fixed portion and second adjustable portion that is set during calibration of the regulator. The sensitivity of the calibration process is therefore substantially reduced, thereby enabling more accurate settings with less chance of overshooting the desired set point.