Fuel control
AssigneeThe Bendix Corporation
InventorElmer A. Haase
Life of this patent
Estimating the term…
Abstract
An adjustable bellows mechanism in a fuel control apparatus for balancing the internal forces of a valve arrangement to establish a fuel flow from the control apparatus to an engine corresponding to the optimum operational parameter of the engine.
Claims12
In a fuel control apparatus having a valve fixed to a first diaphragm and connected to a second diaphragm by a linkage arrangement, said first diaphragm separating a fuel section into a fuel flow chamber and a fuel supply chamber, said second diaphragm separating an air section into an airflow chamber and a static air chamber, said second diaphragm responding to mass airflow to an engine that creates an airflow pressure differential between the airflow chamber and the static chamber to provide the linkage arrangement with an air input force for moving the valve with respect to a seat and allow fuel to flow from the fuel flow chamber, the fuel flow from the fuel flow chamber creating a fuel flow pressure differential between the fuel flow chamber and the fuel supply chamber to develop a fuel input force that acts on the first diaphragm to oppose the air input force and thereby match the fuel flow from the fuel flow chamber with the mass air flow to establish a fuel to air ratio corresponding to the optimum operational parameter of the engine, the improvement comprising:
- adjustment means connected to the linkage members for balancing internal spring forces associated with first and second diaphragms to assure that the fuel flow from the fuel chamber is zero when the mass airflow to the engine is zero.
In a fuel control apparatus having a housing with an air section and a fuel section separated by a wall, a first diaphragm located in the air section and connected to a second diaphragm located in the fuel section by a linkage arrangement that extends through the wall, a valve connected to said second diaphragm for controlling the flow of fuel from the fuel section to an engine, said first diaphragm being responsive to a control pressure differential indicative of a mass airflow communicated to the engine for providing the linkage arrangement with an input force which moves said valve and allows fuel to flow to the engine, said second diaphragm being responsive to a fuel pressure differential indicative of the fuel supplied to the engine for providing the linkage arrangement with an operational force that opposes the movement of said valve and thereby supply the engine with metered fuel that is proportional to the mass airflow, said first and second diaphragms having internal spring forces that are transmitted into said linkage arrangement, the improvement comprising:
- adjustment means connected to said linkage arrangement for providing a corrective spring force to nullify said internal spring forces and thereby match the fuel flow to the engine with the mass airflow in a ratio corresponding to the optimum operational parameters of the engine.
In a fuel control apparatus having a housing with an air section and a fuel section separated by a wall, a first diaphragm located in the air section and connected to a second diaphragm located in the fuel section by a linkage arrangement that extends through the wall, a valve connected to said second diaphragm for controlling the flow of fuel from the fuel section to an engine, said first diaphragm being responsive to a control pressure differential indicative of a mass airflow communicated to the engine for providing the linkage arrangement with an input force which moves said valve and allows fuel to flow to the engine, said second diaphragm being responsive to a fuel pressure differential indicative of the fuel supplied to the engine for providing the linkage arrangement with an operational force that opposes the movement of said valve and thereby supply the engine with metered fuel that is proportional to the mass airflow, the improvement comprising:
- adjustment means connected to said linkage arrangement for positioning said valve with respect to a valve seat corresponding to the optimum fuel flow associated with the operational parameters of the engine.
Dependencies are inferred from the claim text.