Constant current vacuum regulator
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United States of America Patent
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-
Nov 19, 1991
Issued Date -
N/A
app pub date -
Oct 10, 1990
filing date -
Jan 10, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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