METERING DEVICE FOR A FUEL FEED CIRCUIT OF AN ENGINE

摘要

A metering device for an engine fuel feed circuit, the device including a metering valve, and a pressure regulator device maintaining a constant pressure difference from downstream to upstream across the metering valve, wherein the metering valve includes a seat provided with an inlet orifice and an outlet orifice, a shutter arranged within the seat, and an actuator controlling the position of the shutter, and wherein, between the inlet orifice and the outlet orifice the shutter defines a passage of minimum section that is variable as a function of the position of the shutter along a stroke extending between a bottom abutment and a top abutment and passing via a threshold position.

主权项

1. A metering device for an engine fuel feed circuit, the device comprising:
a metering valve; and a pressure regulator device maintaining a constant pressure difference from downstream to upstream across the metering valve; wherein the metering valve comprises:
a seat provided with an inlet orifice and an outlet orifice;a shutter arranged within the seat; andan actuator controlling the position of the shutter; and wherein, between the inlet orifice and the outlet orifice, the shutter defines a passage of minimum section that is variable as a function of the position of the shutter along a stroke extending between a bottom abutment and a top abutment and passing via a threshold position; wherein the shutter is configured in such a manner that, firstly, the minimum section of said passage, and thus the flow rate of fuel passing through the valve, increases linearly as a function of the position coordinate of the shutter between the bottom abutment (b2) and the threshold position, and that, secondly, the minimum section of said passage, and thus of the fuel flow rate, increases quadratically or more rapidly, as a function of the position coordinate of the shutter between the threshold position and the top abutment.