Method for checking at least one sensor within the anode path of a fuel cell system
AssigneeRobert Bosch GmbH
InventorsSriganesh Sriram, Stephan Strahl
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for checking at least two sensors within an anode path (4) of a fuel cell system (1), having the steps of shutting down the fuel cell system (1); closing the shut-off valve (32) and the purge valve (41); opening an internal valve (34); detecting the pressure values by means of at least two sensors (50, 51, 52, 53, 54) within the anode path; checking whether the pressure values of the at least two sensors (50, 51, 52, 53, 54) differ.
Claims4
A method for checking a function of at least two sensors within an anode path (4) of a fuel cell system (1), comprising steps of:
- 1.) shutting down, via a control unit (11), the fuel cell system (1), wherein
- as the fuel cell system (1) shuts down, a pressure in the anode path (4) is reduced to an ambient pressure or to a pressure between a supply pressure and the ambient pressure;
- 2.) closing, via the control unit (11), a purge valve (41);
- 3.) opening, via the control unit (11), an internal valve (34), wherein in order to
- reduce the pressure in the anode path (4), a shut-off valve (32) at an inlet of a connecting line (8) is closed, and the internal valve (34) and a purge valve (41) are opened;
- 4.) detecting pressure values of at least two sensors (50, 51, 52, 53, 54) within the anode path;
- and
- 5.) checking, via the control unit (11), whether the pressure values of the at least two sensors (50, 51, 52, 53, 54) differ;
- and as the fuel cell system starts up, the internal valve (34) is closed and the shut-off valve (32) is opened, wherein a pressure value measured after a predetermined time interval dt at a first sensor (50) within a connecting line (8) between the shut-off valve (32) and the internal valve (34) is compared to an expected pressure value.
A fuel cell system (1) having a measuring arrangement configured for checking at least two sensors (50, 51, 52, 53, 54), wherein the fuel cell system (1) comprises an anode path (4), an anode (12) and an anode gas return line (14), and a connecting line (8) arranged between a first valve (32) and an internal valve (34) within the anode path (4), the fuel cell system comprising:
- a sensor (50) configured to detect measured values for determining a current pressure at a position within the connecting line (8) of the anode path (4), wherein
- as the fuel cell system (1) shuts down, a pressure in the anode path (4) is reduced to an ambient pressure or to a pressure between a supply pressure and the ambient pressure,
- a control unit (11) configured to check at least one valve within the anode path (4) of the fuel cell system (1) on a basis of the measured values detected by means of the sensor (50), wherein the control unit is configured to
- control shutting down the fuel cell system (1);
- control closing a purge valve (41);
- control opening the internal valve (34), wherein in order to reduce the pressure in the anode path (4), a shut-off valve (32) at an inlet of a connecting line (8) is closed, and the internal valve (34) and a purge valve (41) are opened;
- receive the pressure values of at least two sensors (50, 51, 52, 53, 54) within the anode path;
- and
- check whether the pressure values of the at least two sensors (50, 51, 52, 53, 54) differ;
- and
- as the fuel cell system starts up, the internal valve (34) is closed and the shut-off valve (32) is opened, wherein a pressure value measured after a predetermined time interval dt at a first sensor (50) within a connecting line (8) between the shut-off valve (32) and the internal valve (34) is compared to an expected pressure value.
Dependencies are inferred from the claim text.