| Patent application number | Description | Published |
|---|
| 20100248054 | FUEL CELL SYSTEM - Electric power generation is properly controlled during a high potential avoidance operation. A fuel cell system comprises a fuel cell for generating an electric power upon receiving supply of a reactant gas and a controller for performing control for high potential avoidance with the upper limit of the output voltage of the fuel cell as a high potential avoidance voltage lower than the open end voltage thereof. The controller computes a larger system requirement power out of a system requirement power calculated from a load requirement and a system requirement power calculated from the high potential avoidance voltage as a system requirement power for the fuel cell. To compute the system requirement power for the fuel cell, not only the system requirement power calculated from the load requirement but also the system requirement power calculated from the high potential avoidance voltage are taken into account, and therefore the electric power can be stably generated without causing fuel shortage. The amount of the electric power to be generated can be properly controlled, and hence battery overcharging can be thus prevented. | 09-30-2010 |
| 20100273071 | FUEL CELL SYSTEM AND FUEL CELL DEGRADATION JUDGMENT METHOD - Provided is a fuel cell system which can measure an air blow interval and consider an exceptional condition such as a high-potential-avoiding operation, thereby enabling an accurate judgment of degradation of an electrolyte. An actual air blow time interval is measured while estimating a theoretical air blow time interval when an increase of a hydrogen consumption amount corresponding to a cell voltage in the high-potential-avoiding operation according to an output current by using a relationship table which contains a record of a relationship between a hydrogen consumption amount consumed for maintaining the function of a fuel cell and the air supply time interval varying with the increase of the hydrogen consumption amount. The degradation of the electrolyte of the fuel cell is judged according to whether the measured actual air blow time interval is shorter than the theoretical air blow time interval corresponding to the hydrogen consumption amount. | 10-28-2010 |
| 20110018491 | POWER SUPPLY CONTROL CIRCUIT - In order to more rapidly warm up a battery device in a power supply equipped with a fuel cell and a battery device, a fuel-cell-mounted vehicle driving system for driving and controlling a rotating electric machine installed on a vehicle comprises an inverter connected to the rotating electric machine; a power supply circuit having a battery device, a voltage converter, and a fuel cell; and a power supply control device for controlling the power supply circuit. The power supply control device includes an FC output voltage setting module for setting the output voltage of the fuel cell, an OCV avoidance module for, when an FC output voltage is set, avoiding a voltage around an OCV, a battery warm-up control determination module for determining whether the battery device is under warm-up control or not, and an OCV avoidance release module for, when the battery device is under the warm-up control, releasing the OCV avoidance. | 01-27-2011 |
| 20110033762 | FUEL BATTERY SYSTEM - A fuel battery system which can suppress unexpected variation of a target power during execution of a high potential avoidance control operation. The fuel battery system sets a high potential avoidance target voltage value, converts the high potential avoidance target voltage value into a target power value on the basis of the voltage-power property map of a fuel battery, limits the target power value within a range between a predetermined upper limit value and a predetermined lower limit value, and controls the operation of the fuel battery on the basis of the target power value while limiting the output voltage of the fuel battery to a value which is not larger than the high potential avoidance target voltage. This can suppress the unexpected variation of the target power value resulting from the erroneous estimation of output properties caused by the momentary drop of the high potential avoidance target voltage. | 02-10-2011 |
