Electronic control for a variable delivery positive...

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

Patent

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Details

F02M 59/20 (2006.01) F02C 9/30 (2006.01) F02D 41/14 (2006.01) F02M 37/04 (2006.01) F02M 37/08 (2006.01)

Patent

CA 2206917

An electronic control for a variable delivery, positive displacement fuel pump includes a flow sensor located at the fuel outlet to the engine. The flow sensor provides a signal, indicative of actual fuel flow to the engine, to an electronic engine control. The electronic engine control compares actual fuel flow with desired fuel flow, and upon any difference therebetween commands an electrohydraulic servo valve to position a pump control actuator. The pump control actuator controls the amount of fuel delivered by the pump. Also, fuel flow upstream of the flow sensor is bypassed in a line to another section of the electrohydraulic servo valve. The electronic engine control commands a small amount of fuel to be bypassed back to the pump inlet during normal operating conditions. However, upon the occurrence of a transient condition, the electronic engine control causes more or less fuel to be bypassed back to the pump inlet. In this way, improved transient response of the pump is achieved by the electronic control of the present invention.

Cette invention concerne un dispositif de commande électronique de pompe à essence volumétrique à débit variable, comportant un capteur de débit placé en amont de l'admission de carburant au moteur et fournissant une indication du débit réel d'admission à un dispositif électronique de commande moteur. Ce dernier compare le débit réel au débit désiré et, en cas d'écart entre ces deux valeurs, commande une servovalve électrohydraulique qui agit sur le régulateur de la pompe. Ce dernier règle le débit de la pompe. Par ailleurs, une canalisation de dérivation relie la canalisation de refoulement de la pompe en amont du capteur de débit à une autre partie de la servovalve. En régime établi, le dispositif de commande électronique moteur commande le retour à l'entrée de la pompe d'une faible quantité de carburant. En régime transitoire, il commande le retour à l'entrée de la pompe d'une quantité plus ou moins grande de carburant. Le dispositif de commande électronique de cette invention autorise ainsi une réponse transitoire améliorée de la pompe.

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