Constant current vacuum regulator

Details Constant current vacuum regulator Constant current vacuum regulator

1990-10-10

1991-11-19

Michalsky, Gerald A.

Valves and valve actuation

Electrically actuated valve

Including solenoid

137 82, 137907, 25112918, 25112921, F16K 3106

Patent

active

050659790

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.

REFERENCES:
patent: 3433256 (1969-03-01), Stillhard et al.
patent: 3529620 (1970-09-01), Heiber
patent: 3982554 (1976-09-01), Saito et al.
patent: 4522371 (1985-06-01), Fox et al.
patent: 4534375 (1985-08-01), Fox
patent: 4567910 (1986-02-01), Slavin et al.
patent: 4610428 (1986-09-01), Fox
patent: 4715396 (1987-12-01), Fox
patent: 4741365 (1988-05-01), Van Ornum
patent: 4793372 (1988-12-01), Gauthier et al.

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