Constant current vacuum regulator

F - Mech Eng,Light,Heat,Weapons – 16 – K

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F16K 31/06 (2006.01) F02M 25/07 (2006.01) G05D 16/20 (2006.01)

Patent

CA 2025494

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.

égulateur de vide pour véhicules automobiles du type comportant un système de recirculation des gaz d'échappement (RGE) commandé par ordinateur. Le régulateur commande le signal de vide acheminé à la soupape du RGE selon l'intensité du courant transmis par l'ordinateur de gestion du moteur. Le régulateur de vide comprend un solénoïde qui comporte, sur le trajet du flux magnétique, un entrefer secondaire situé à l'extrémité opposée de la pièce polaire de l'armature. Le trajet du flux magnétique divisé par l'entrefer secondaire est composé d'une partie fixe et d'une partie réglable, laquelle est réglée pendant l'étalonnage du régulateur. L'étalonnage représente dès lors une opération beaucoup moins délicate, permettant des réglages beaucoup plus précis et diminuant les risques de dépassement de la valeur de consigne souhaitée.

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