Electronic control for a variable delivery, positive displacemen

Power plants – Combustion products used as motive fluid – Combined with regulation of power output feature

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60734, F02C 928

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active

058063005

ABSTRACT:
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.

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