초록 ▼

The present invention finds application in engines using mechanically actuated electronically controlled fuel injectors having direct control needle valves. In valves such as these, a spill control valve member controls fuel pressurization within the injector while a needle control valve member cont

The present invention finds application in engines using mechanically actuated electronically controlled fuel injectors having direct control needle valves. In valves such as these, a spill control valve member controls fuel pressurization within the injector while a needle control valve member controls the timing and duration of the injection event. However, when the momentum of fuel exiting the fuel injector past the spill valve is greater than that of the tappet and plunger moving toward their downward positions, engine components upstream of the tappet can briefly separate and re-engage, which can result in increased mechanical noise levels. Therefore, the present invention is directed to maintaining sufficient contact force in the various engine components to reduce the mechanical noise levels by positioning a flow restriction between the fuel pressurization chamber of the fuel injector and a fuel source.

대표청구항 ▼

The present invention finds application in engines using mechanically actuated electronically controlled fuel injectors having direct control needle valves. In valves such as these, a spill control valve member controls fuel pressurization within the injector while a needle control valve member cont

The present invention finds application in engines using mechanically actuated electronically controlled fuel injectors having direct control needle valves. In valves such as these, a spill control valve member controls fuel pressurization within the injector while a needle control valve member controls the timing and duration of the injection event. However, when the momentum of fuel exiting the fuel injector past the spill valve is greater than that of the tappet and plunger moving toward their downward positions, engine components upstream of the tappet can briefly separate and re-engage, which can result in increased mechanical noise levels. Therefore, the present invention is directed to maintaining sufficient contact force in the various engine components to reduce the mechanical noise levels by positioning a flow restriction between the fuel pressurization chamber of the fuel injector and a fuel source. rough its walls. The injection valve divides the total amount of fuel injected per cycle into a main dose and a pilot dose. The main dose is injected into the combustion chamber, forming a lean mixture therein. The smaller pilot dose is injected inside the combustion shell, forming a rich moisture therein. The ignition means easily ignite this rich mixture. As the fuel burs inside the combustion shell, the pressure therein will rise and the combustion flames will be ejected through the flame nozzles into the combustion chamber. Thus torch ignition of the lean mixture field occurs. condition and a non-coupling condition, said coupling switch being brought to said coupling condition when said main switch is closed, said coupling switch including an actuator that is coupled to said power source through said main switch, said actuator maintaining said coupling switch in said coupling condition when activated, and a delay component that is coupled to said actuator, said delay component activating said actuator after said main switch is opened. 2. A control system as set forth in claim 1, wherein said delay component energizes said actuator for a preset time period after main switch is opened. 3. A control system as set forth in claim 1, wherein said delay component energizes said actuator by employing a signal that is primarily used for a component that relates to a control of said engine. 4. A control system as set forth in claim 3, wherein said engine includes a sensor sensing an operational condition of said engine, and said signal employed by said delay component comprises a signal sensed by said sensor. 5. A control device as set forth in claim 4, wherein said sensor senses an engine speed. 6. A control system as set forth in claim 3, wherein said engine includes a fuel injection system having a fuel pump, and said component comprises said fuel pump. 7. A control system as set forth in claim 1, wherein said delay component produces a hold signal that energizes said actuator for a preset period of time after said main switch is opened. 8. A control system as set forth in claim 1, wherein said delay component comprises said locking circuit that energizes said control unit when said main switch is opened. 9. A control system as set forth in claim 1, wherein said coupling switch comprises a relay having a fixed contact and a movable contact, and actuator comprises an exciting coil that is adapted to exert a magnetic force on said movable contact to move said moveable contact into contact with said fixed contact. 10. A control system as set forth in claim 9, wherein said exciting coil comprises a pair of ends, one of said pair of ends is grounded and said other of said pair of ends is connected to said power source through said main switch. 11. A control system as set forth in claim 1, wherein said main switch comprises a fixed contact and a movable contact, and said actuator is activated when said movable contact comes into contact with said fixed contact. 12. A control system as set forth in claim 1, wherein said power source comprises a battery. 13. A control system as set forth in claim 1, wherein said actuator is integrally formed with said control unit. 14. A control system as set forth in claim 1, wherein said actuator is an electrically operated component. 15. A control system as set forth in claim 14, wherein said actuator generates a magnetic force. 16. A control system as set forth in claim 15, wherein said actuator in a coil through which current is passed. 17. A method of controlling a power supply to a controller of an engine, said method comprising determining when a main switch of said controller is deactivated, generating an output signal for a preset of time when said main switch deactivated so as to continue powering said controller, and discontinuing power to said controller when said output signal ends. 18. The method of claim 17, wherein said output signal is generated by a sensor used to detect an operational condition of said engine. 19. The method of claim 18, wherein said sensor is an engine speed sensor. 20. The method of claim 17, wherein said output signal is generated by a control circuit for a component of said engine. 21. The method of claim 20, wherein said component is a fuel pump. 22. A method of controlling a power supply to a controller adapted to control an engine, said method comprising sensing an operational condition of a main switch, generating an output signal for a preset period of time when said operational condition of said main switch changes, delaying a shutdow