F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
123/140
F02M 61/06 (2006.01) F02M 61/20 (2006.01)
Patent
CA 1198022
A CONTROL DEVICE AND METHOD FOR ACTIVATING A FUEL INJECTOR NOZZLE Abstract of the Disclosure A control device and method for opening and closing the nozzle of a fuel injector rapidly and precisely to provide a sharp cut off of injection so as to achieve better combustion, less smoke and lower emissions. The control device includes first and second cavities formed in the body of the fuel injector, with the second cavity being located close to the nozzle. First and second variable pressure supply chambers are connected to the nozzle and to the cavities by several fluid passages. A spool valve and a needle valve are positioned in the first and second cavities, respectively, with the spool valve having a stem projecting into the second cavity. A spring is situated in the second cavity and forms a link between the stem and the needle valve. The spool valve is actuated by a difference of pressure in the first and second pressure chambers to move between open and closed positions. In the open position, fluid flow from one of the pressure chambers is permitted through the spool valve and to the second cavity. As the fluid pressure in the second cavity increases sufficiently to overcome the force of the spring, the needle valve opens and allows fluid flow through the nozzle. As the spool valve moves to its closed position, it compresses the spring further and urges the needle valve to close. The needle valve closes prior to a drop in fluid pressure in the second cavity.
423622
Borden Ladner Gervais Llp
Deere & Company
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