초록 ▼

A fuel control system for supplying metered quantities of fuel from a fuel supply (11), through a boost pump (13), a filter (21), a high pressure fuel pump (14), a metering valve (15) and a pressurizing valve (17) to an engine fuel manifold (19) includes an ecology valve (43) which provides a fuel f

A fuel control system for supplying metered quantities of fuel from a fuel supply (11), through a boost pump (13), a filter (21), a high pressure fuel pump (14), a metering valve (15) and a pressurizing valve (17) to an engine fuel manifold (19) includes an ecology valve (43) which provides a fuel flow path (41, 42, 71, 46, 18) between the pressurizing valve (17) and the engine fuel manifold. The status of the ecology valve (43) is solely determined by the status of the pressurizing valve (17). The ecology valve (43) includes a housing (93, 95, 97) with a piston (61) disposed therein which is reciprocable between two extreme positions. The piston (61) defines, in conjunction with the housing, a variable volume chamber (55) for withdrawing a one piston stroke volume of fuel from the engine fuel manifold when the engine is de-energized and the piston (61) moves from one extreme position to the other thereby purging the fuel manifold of fuel.

대표청구항 ▼

[What is claimed is:] [1.]a valve housing including an inlet port adapted to be coupled to a main fuel flow outlet of the pressurizing valve, an outlet port adapted to be coupled to the engine fuel manifold, and a control port adapted to be connected to a control port of the pressurizing valve; anda

[What is claimed is:] [1.]a valve housing including an inlet port adapted to be coupled to a main fuel flow outlet of the pressurizing valve, an outlet port adapted to be coupled to the engine fuel manifold, and a control port adapted to be connected to a control port of the pressurizing valve; anda movable piston supported within the valve housing for reciprocable motion along an axis and whose position is controlled solely by the pressurizing valve, the piston having one position allowing maximum flow of fuel from the inlet port to the outlet port, and another position substantially blocking any fuel flow from the inlet port to the outlet port, the piston responding to high pressure at the ecology valve control port to move toward said one position and to lower pressure, indicative of cessation of engine operation, at the ecology valve control port, to move toward said another position.