Circuit for driving the excitation coil of an...

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

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F02D 41/20 (2006.01) F01M 1/02 (2006.01) F02M 37/00 (2006.01) F02M 37/08 (2006.01) F02M 39/00 (2006.01) F02M 51/04 (2006.01) F02M 55/00 (2006.01) F02M 55/02 (2006.01) F02M 57/02 (2006.01) F02M 59/38 (2006.01) F02M 61/04 (2006.01) F02M 61/08 (2006.01) F02M 63/06 (2006.01) F02M 69/24 (2006.01) F02M 69/34 (2006.01) F02M 69/46 (2006.01) F02M 63/00 (2006.01)

Patent

CA 2127801

The invention pertains to a circuit for driving the excitation coil of an electromagnetically driven reciprocating pump used as an injection device, characterised by a circuit for driving the rotor excitation coil (600) which is connected to a power transistor (601) which is grounded via a measuring resistor (602), whereby the output of a comparator (603) is hooked on to the control input of the transistor (601), e.g. to the transistor base, and whereby a current setpoint is applied to the non-inverting input of the comparator (603). This setpoint is e.g. obtained from a microcomputer and the inverting input of the comparator (603) is connected to the side of the measuring resistor which isconnected with the transistor (601).

L'invention concerne un circuit de commande de la bobine d'excitation d'une pompe à piston alternatif commandée électromagnétiquement et utilisée comme dispositif d'injection de carburant. Cette invention se caractérise par un circuit de commande de la bobine d'excitation de l'induit (600), qui est reliée à un transistor de puissance (601) qui est mis à la terre par l'intermédiaire d'une résistance de précision (602). Un comparateur (603) est monté par sa sortie contre l'entrée de commande du transistor, par exemple à la base du transistor. Une valeur théorique de courant est appliquée à l'entrée du comparateur (603) n'effectuant pas d'inversion. Cette valeur théorique de courant peut par exemple être obtenue au moyen d'un micro-ordinateur. L'entrée du comparateur (603) effectuant une inversion est raccordée au côté de la résistance de précision qui est reliée au transistor (601).

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