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US 12,146,461 B2Granted
Dual valve fuel metering systems
AssigneeHamilton Sundstrand Corporation
InventorsSachin Ramprashad, Todd Haugsjaahabink
Life of this patent
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Abstract
A dual valve fuel metering system comprising a flow path defined between a fuel inlet and a fuel outlet. The flow path includes a primary flow path and a secondary flow path, wherein the fuel outlet is configured and adapted to be in fluid communication with at least one engine fuel manifold. A primary flow metering valve configured and adapted to meter flow on the primary flow path. A secondary flow metering valve configured and adapted to meter flow on the secondary flow path.
Claims17
A dual valve fuel metering system comprising:
- a flow path defined between a fuel inlet and a fuel outlet, wherein the flow path includes a primary flow path and a secondary flow path, wherein the fuel outlet is configured and adapted to be in fluid communication with at least one engine fuel manifold;
- a primary flow metering valve configured and adapted to meter flow on the primary flow path;
- a primary electrohydraulic servo valve configured to control a position of a piston of the primary flow metering valve;
- a secondary flow metering valve configured and adapted to meter flow on the secondary flow path;
- and
- a secondary electrohydraulic servo valve configured to control a position of a piston of the secondary flow metering valve;
- a supply line fluidically connected to the primary electrohydraulic servo valve and to the secondary electrohydraulic servo valve, wherein the supply line is fluidically connected to the flow path upstream from a split between the primary flow path and the secondary flow path;
- and
- a servo pressure regulating valve in the supply line, and
- wherein the flow path is free from valve or metering devices between the servo pressure regulating valve and the split.
7 more elements
An engine fuel control system comprising:
- a pump;
- a dual valve fuel metering system downstream from the pump, wherein the dual valve fuel metering system includes:
- a flow path defined between a fuel inlet and a fuel outlet, wherein the flow path includes a primary flow path and a secondary flow path, wherein the fuel outlet is configured and adapted to be in fluid communication with at least one engine fuel manifold;
- a primary flow metering valve configured and adapted to meter flow on the primary flow path;
- a primary electrohydraulic servo valve configured to control a position of a piston of the primary flow metering valve;
- a secondary flow metering valve configured and adapted to meter flow on the secondary flow path;
- a secondary electrohydraulic servo valve configured to control a position of a piston of the secondary flow metering valve;
- a supply line fluidically connected to the primary electrohydraulic servo valve and to the secondary electrohydraulic servo valve, wherein the supply line is fluidically connected to the flow path upstream from a split between the primary flow path and the secondary flow path;
- and
- a servo pressure regulating valve in the supply line;
- an engine downstream from the dual valve fuel metering system;
- and
- an engine computer operatively coupled to the dual valve fuel metering system to control the dual valve fuel metering system.
10 more elements
Dependencies are inferred from the claim text.