초록 ▼

A three-way fuel injection control valve assembly is provided which includes a pilot valve for controlling the movement of a drain valve member and a separate supply valve member to minimize valve response time and transition flow losses. The solenoid operated two-way pilot valve controls the flow o

A three-way fuel injection control valve assembly is provided which includes a pilot valve for controlling the movement of a drain valve member and a separate supply valve member to minimize valve response time and transition flow losses. The solenoid operated two-way pilot valve controls the flow of fuel from a control volume formed adjacent the ends of the drain valve member and the supply valve member to begin and end an injection event. A transition flow loss limiting feature is provided which causes the drain valve member to close prior to the opening of the supply valve member and subsequently causes the supply valve member to close prior to the opening of the drain valve member during a given injection event thereby minimizing transition flow losses. The transition flow loss limiting feature includes sizing the cross sectional areas of the supply valve member and the drain valve member, sizing a bias plunger for biasing the drain valve member and sizing one or more bias springs so that no opening overlap occurs between the supply valve member and the drain valve member.

대표청구항 ▼

[We claim:] [1.]a valve housing containing at least one valve chamber and a high pressure supply circuit, a drain circuit and an outlet circuit communicating with said at least one valve chamber;a first valve member mounted for reciprocal movement within said at least one valve chamber between a clo

[We claim:] [1.]a valve housing containing at least one valve chamber and a high pressure supply circuit, a drain circuit and an outlet circuit communicating with said at least one valve chamber;a first valve member mounted for reciprocal movement within said at least one valve chamber between a closed position in which said high pressure supply circuit is isolated from said outlet circuit and an open position in which said high pressure supply circuit is in fluid communication with said outlet circuit;a second valve member mounted for reciprocal movement within said at least one valve chamber between an open position in which said outlet circuit is in fluid communication with said drain circuit and a closed position in which said outlet circuit is isolated from said drain circuit; anda valve control means for controlling the movement of said first and said second valve members between respective open and closed positions, said valve control means including a control volume positioned adjacent outer ends of said first valve member and said second valve member for receiving high pressure fuel from said high pressure supply circuit and an electronically controlled injection control valve positioned along said drain circuit for controlling the flow of fuel from said high pressure supply circuit through said drain circuit so as to cause the movement of said first and said second valve members between respective open and closed positions.