초록 ▼

This invention relates to a fuel supply system for an engine having a main fuel flow scheduling device, an auxiliary fuel flow scheduling device, a power demand adjuster operative to adjust both scheduling device, and a failure detector capable of detecting failure of the main scheduling device and

This invention relates to a fuel supply system for an engine having a main fuel flow scheduling device, an auxiliary fuel flow scheduling device, a power demand adjuster operative to adjust both scheduling device, and a failure detector capable of detecting failure of the main scheduling device and of making the auxiliary scheduling device operative to control fuel flow to the engine following such failure. In the past, fuel systems of this kind have given an abrupt change of fuel flow on changeover to the auxiliary scheduling device giving the possibility of damage to the engine and danger to human life. In the present invention a metering valve 201 forms part of the auxiliary scheduling device 201, 246, 209, 221, 222, 231, 232, 233, 234 for continuous adjustment of the flow to the engine permitted by the main scheduling device 184. Whenever the auxiliary scheduling device begins to control fuel flow, the flow remains constant at the instant of changeover at the value determined by the main scheduling device just prior to the changeover. The auxiliary scheduling device may be arranged for slow self-variation after the changeover to alter the relation between fuel flow to the engine and the setting of the power demand adjuster.

대표청구항 ▼

In a liquid fuel supply system including: (a) a source of fuel under pressure, (b) a fuel outlet, (c) flow adjusting means for adjusting fuel flow from the source to the outlet, (d) a main fuel flow scheduling means normally controlling said flow adjusting means, (e) an auxiliary fuel flow schedulin

In a liquid fuel supply system including: (a) a source of fuel under pressure, (b) a fuel outlet, (c) flow adjusting means for adjusting fuel flow from the source to the outlet, (d) a main fuel flow scheduling means normally controlling said flow adjusting means, (e) an auxiliary fuel flow scheduling means, comprising: (i) a metering valve having overlapping metering ports through which fuel flows to the outlet, the area of overlap being adjustable by a length movement and a width movement, (ii) pressure drop responsive means responding to pressure drop at the metering valve to adjust said area of overlap by one of said movements to tend to maintain a constant pressure drop across the metering valve, (f) a power demand adjuster connected to adjust the main scheduling means and also connected to adjust the said area of overlap of the metering valve ports by the other of said movements, (g) a failure detector responsive to failure of the main scheduling means to cause the auxiliary scheduling means to begin to control the flow adjusting means by connecting the pressure drop responsive means in substitution for the main flow scheduling means to adjust the flow adjusting means in the sense to maintain a constant pressure drop at the said metering valve ports; the improvement in which said overlapping ports are disposed in the path of fuel flow from said source of fuel to said outlet both when said main scheduling means controls said flow adjusting means and when said auxiliary scheduling means controls said flow adjusting means.