Fuel-pumping device for an internal combustion engine, and a method for pumping fuel in a fuel-pumping device
AssigneeRobert Bosch GmbH
InventorMartin Bernhaupt
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Abstract
The invention relates to a fuel-pumping device (1) for a fuel injection device of an internal combustion engine with a large high-pressure pump (16) and a small high-pressure pump (14) arranged in parallel, wherein fuel can be pumped by the large high-pressure pump (16) and by the small high-pressure pump (14) from a low-pressure region (13) into a high-pressure region (18). The high-pressure region (18) is connected to at least one injector (21). A control device (30) is provided, which can be used to conduct the entire pump output of the large high-pressure pump (16) or the small high-pressure pump (14) into the low-pressure region (13) via a discharge line (15).
Claims12
A fuel-pumping device (1) for a fuel injection unit of an internal combustion engine, the fuel-pumping device comprising a large high-pressure pump (16) and a small high-pressure pump (14) which are arranged in parallel, the large high-pressure pump (16) and the small high-pressure pump (14) being configured to pump fuel from a low-pressure region (13) into a high-pressure region (18), the high-pressure region (18) being connected to at least one injector (21), further comprising a control unit (30) configured to control a total pump output of the large high-pressure pump (16) or the small high-pressure pump (14) into the low-pressure region (13) via a discharge line (15).
A method for pumping fuel in a fuel-pumping device (1) for a fuel injection unit of an internal combustion engine, the fuel-pumping device comprising a large high-pressure pump (16) and a small high-pressure pump (14) which are arranged in parallel, the large high-pressure pump (16) and the small high-pressure pump (14) being configured to pump fuel from a low-pressure region (13) into a high-pressure region (18), the method comprising, during gas operation of the fuel delivery device (1), pumping a total pump output of the large high-pressure pump (16) into the low-pressure region (13).
Dependencies are inferred from the claim text.