Fuel cell system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMasaaki MATSUSUE
Life of this patent
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Abstract
To provide a fuel cell system configured to reduce false cross leak judgment. A fuel cell system wherein the controller preliminarily stores a first data group indicating a relationship between the flow rate of the oxidant gas, the opening degree of the bypass valve, and the hydrogen concentration of the oxidant off-gas; and wherein before the controller determines whether or not a cross leak has occurred, the controller varies the hydrogen concentration threshold used for determining whether or not a cross leak has occurred, by comparing the flow rate of the oxidant gas measured by the oxidant gas flow rate sensor and the opening degree of the bypass valve with the first data group.
Claims7
A fuel cell system,
- wherein the fuel cell system comprises:
- a fuel cell,
- an oxidant gas supplier for supplying oxidant gas to the fuel cell,
- an oxidant gas supply flow path connecting the oxidant gas supplier and an oxidant gas inlet of the fuel cell,
- an oxidant gas flow rate sensor disposed in the oxidant gas supply flow path,
- an oxidant off-gas discharge flow path for allowing oxidant off-gas to be discharged from an oxidant gas outlet of the fuel cell to the outside,
- an oxidant gas bypass flow path branching from the oxidant gas supply flow path, bypassing the fuel cell, and connecting a branch of the oxidant gas supply flow path and a first junction of the oxidant off-gas discharge flow path,
- a bypass valve disposed in the oxidant gas bypass flow path,
- a hydrogen concentration sensor disposed downstream from the first junction of the oxidant off-gas discharge flow path, and
- a controller,
- wherein the controller controls driving of the oxidant gas supplier and controls an opening degree of the bypass valve;
- wherein the controller determines whether or not a cross leak has occurred, from the hydrogen concentration of the oxidant off-gas measured by the hydrogen concentration sensor;
- wherein, when the hydrogen concentration of the oxidant off-gas measured by the hydrogen concentration sensor is equal to or more than a predetermined threshold, the controller determines that a cross leak has occurred;
- wherein the controller preliminarily stores a first data group indicating a relationship between the flow rate of the oxidant gas, the opening degree of the bypass valve, and the hydrogen concentration of the oxidant off-gas;
- and
- wherein before the controller determines whether or not a cross leak has occurred, the controller varies the hydrogen concentration threshold used for determining whether or not a cross leak has occurred, by comparing the flow rate of the oxidant gas measured by the oxidant gas flow rate sensor and the opening degree of the bypass valve with the first data group.
Dependencies are inferred from the claim text.