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US 5,715,786 AGranted
Device for detecting leakage in a fuel supply
AssigneeRobert Bosch GmbH
InventorStefan Seiberth
Life of this patent
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AssigneeRobert Bosch GmbH
InventorStefan Seiberth
Estimating the term…
A device for detecting leakage in a fuel supply system of an internal combustion engine in which fuel is pumped from a fuel container under pressure by at least one pump and reaches injection valves over corresponding lines, the device has a control unit, a plurality of operating condition detecting sensors detecting operating conditions of the internal combustion engine and sending signals to the control unit, a return line with a valve formed so that excess fuel is returnable to the fuel container, the valve being connected with the control unit so that when the control unit detects a predetermined operating state of the engine from the signals of the operating condition sensors, the control unit closes the valve, and a pressure sensor, and a pressure sensor operative for measuring a fuel pressure when the valve is closed and connected to the control unit so that the pressure sensor supplies to the control unit a signal corresponding to the measured pressure, and the control unit compares the signal corresponding to the measured fuel pressure with a signal corresponding to a fuel pressure to be expected to indicate a leak when a deviation between the measured fuel pressure and the fuel pressure to be expected occurs.
A device for detecting leakage in a fuel supply system of an internal combustion engine, especially a self-igniting engine, in which the fuel is pumped from the fuel container under pressure by at least one pump and reaches the injection valves over corresponding lines, having a pressure sensor that measures the fuel pressure and a computation device to which other measurement variables characterizing the operating state are supplied, for forming trigger signals, characterized in that a return line with a valve is present, by way of which excess fuel can be returned to the fuel tank;
A device for detecting leakage in a fuel supply system of an internal combustion engine in which fuel is pumped from a fuel container under pressure by at least one pump and reaches injection valves over corresponding lines, the device comprising a control unit;
Dependencies are inferred from the claim text.