초록 ▼

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

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.

대표청구항 ▼

[ I claim:] [1.] 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 pre

[ I claim:] [1.] 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; that the computation device detects a predeterminable operating state of the engine from measurement variables and upon detection of this predeterminable operating state closes the valve, and the pressure or pressure course that then ensues is compared with the pressure or pressure course to be expected, and deviations indicate a leak.