Constant current vacuum regulator
US5065979A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Oct 10, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2278
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.