Exhaust gas recirculation valve having a centered solenoid...

F - Mech Eng,Light,Heat,Weapons – 02 – M

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F02M 25/07 (2006.01) F16K 31/06 (2006.01) H01F 7/16 (2006.01)

Patent

CA 2300299

A valve assembly (10) for introducing exhaust gas into the intake manifold of an internal combustion engine, preferably, an electric exhaust gas recirculation valve assembly. The valve assembly (10) includes an actuator (16) having a centered solenoid assembly (18) that reciprocates a floating valve mechanism (14) to provide a substantially constant flow rate of exhaust gas regardless of the reciprocating direction of the floating valve mechanism (14). That is, the valve assembly (14) delivers a gas flow rate that is substantially free of hysteresis because the valve assembly provides substantially the same exhaust gas flow rate for a given percentage of a pulse width modulated duty cycle when the floating valve mechanism (14) is reciprocating in a valve opening direction or a valve closing direction.

L'invention concerne un système de soupape (10) permettant d'introduire des gaz d'échappement dans le collecteur d'admission d'un moteur à combustion interne, de préférence un système de soupape de recirculation des gaz d'échappement. Ce système de soupape (10) comprend un actionneur (16) comportant un solénoïde centré (18) qui imprime un mouvement de va-et-vient à un mécanisme de soupape flottante (14), afin d'assurer un débit sensiblement constant de gaz d'échappement, indépendamment de la direction de va-et-vient du mécanisme de soupape flottante (14). Cela revient à dire que le système de soupape (14) fournit un débit de gaz d'échappement sensiblement exempt d'hystérèse, du fait que le système de soupape fournit sensiblement le même débit de gaz d'échappement pour un pourcentage donné d'utilisation à modulation d'impulsions en largeur, si le mécanisme de soupape flottante (14) effectue un mouvement de va-et-vient dans un sens d'ouverture ou dans un sens de fermeture de la soupape.

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