Patent ID: 6651442
Filing Date: 2003-11-25
Classification: F02C,F02D,F02M

Abstract:
An apparatus for determining the status of a shut-off valve arrangement forming part of a fuelling system of an engine, the shut-off valve arrangement being operable between open and closed positions, the apparatus comprising:a metering valve arrangement comprising a metering valve member for regulating fuel flow from a pump forming part of the fuelling system to the engine and position sensor for monitoring the position of the metering valve member; wherein the metering valve member is operable between a maximum flow position in which there is a maximum flow of fuel through the metering valve arrangement to the shut-off valve arrangement, and a minimum flow position in which there is a minimum flow of fuel through the metering valve arrangement to the shut-off valve arrangement, the position of the metering valve member being controlled by controlling fuel pressure acting on the metering valve member; a port for varying fuel pressure acting on the metering valve member upon closure of the shut-off valve arrangement; and a sensor for monitoring the response of the metering valve arrangement to the variation in fuel pressure applied to the metering valve member so as to provide an indication that the shut-off valve arrangement has closed.