Unit injector system with preinjection
AssigneeRobert Bosch GmbH
InventorFriedrich Boecking
Life of this patent
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Abstract
The invention relates to a unit injector system for internal combustion engines, in particular diesel engines, having a pump element for subjecting fuel in a pump chamber to high pressure, having an injection element for injecting the pressurized fuel into the combustion chamber of the engine, and having a control valve, which opens and closes a connection between the pump chamber and a low-pressure chamber. To make a preinjection possible, a throttle device (13) is disposed in the connection between the pump chamber and the low-pressure chamber, and there is a flow through the throttle device as a function of the position of the control valve.
Claims13
A unit injector system for internal combustion engines, in particular diesel engines, comprising a pump element for subjecting fuel in a pump chamber to high pressure, an injection element for injecting the pressurized fuel into the combustion chamber of the engine, a control valve which opens and closes a connection between said pump chamber and a low-pressure chamber, and a throttle device (13, 33) disposed in the connection between said pump chamber and said low-pressure chamber, said throttle device controlling flow therethrough as a function of the position of said control valve.
Dependencies are inferred from the claim text.