Patent application number | Description | Published |
20080245437 | Fuel Gas Storing and Supplying Device - It is an object to provide a fuel gas storing and supplying device in which high-pressure fuel tanks are disposed parallel to each other and each tank is provided with a discharge valve and a regulator valve; the apparatus being able to suppress the amount of fuel gas that has to be consumed or discharged when the system is stopped, and able to increase fuel efficiency, and to able make it possible to stop the system rapidly. The fuel gas storing and supplying device of the present invention includes high-pressure fuel tanks that are piped and connected in parallel to a fuel gas receiver device, a discharge valve provided for each high-pressure fuel tank, and a regulator valve provided downstream of each discharge valve; and at least one discharge valve is closed when fuel gas is supplied. | 10-09-2008 |
20090110985 | Fuel Cell System - A fuel cell system according to the present invention is characterized by comprising a measurement unit which measures an impedance of a fuel cell in a predetermined frequency region, and a regulation unit which regulates an amount of a gas to be supplied to the fuel cell based on a measured value of the impedance in the predetermined frequency region. According to such a constitution, the impedance of the fuel cell in the predetermined frequency region (e.g., a low frequency region) is measured, and the amount of the gas (e.g., an amount of an oxidizing gas) to be supplied to the fuel cell is regulated based on this measured value of the impedance. Here, since the impedance of the fuel cell in the predetermined frequency region largely differs with a fuel supply state (see FIG. | 04-30-2009 |
20090117427 | Fuel Cell System - There is provided a fuel cell system in which a constantly accurate impedance measurement is made possible regardless of a response characteristic of the voltage converting device. A superimposed signal analysis section analyzes an impedance measuring signal after passing through a DC/DC converter to thereby notify a superimposed signal amplitude control section of an analysis result. A superimposed signal amplitude control section controls an amplitude value of the impedance measuring signal generated by a superimposed signal generating section based on the result notified from the superimposed signal analysis section. | 05-07-2009 |
20090130509 | Fuel Cell System - There is disclosed a fuel cell system in which a poisoned electrode catalyst can be recovered while meeting a demand for an output power. When a controller detects that an electrode catalyst is positioned, the controller derives a target operation point adequate for recovering a function of the poisoned electrode catalyst to realize shift of an operation point so that the output power is kept constant. Specifically, an FC voltage is controlled using a DC/DC converter, and an amount of an oxidizing gas to be fed from an oxidizing gas supply source is adjusted, thereby controlling an FC current. | 05-21-2009 |
20090169934 | Fuel Cell System - A fuel cell system according to the present invention is characterized by comprising a fuel cell, measurement means for measuring impedances of the fuel cell in two kinds or more of frequency regions, and first judgment means for judging two or more parameters concerned with an internal state of the fuel cell based on measurement results of the impedances in the respective frequency regions. According to such a constitution, the impedances in the two or more types of frequency regions (a high frequency region, a low frequency region and the like) are measured to judge two or more parameters such as a wet state of an electrolytic film of the fuel cell and a supply state of a fuel gas, which are concerned with the internal state of the fuel cell based on this measurement result. Since such judgment is performed, as compared with the conventional technology, the internal state of the fuel cell can accurately be grasped, and highly efficient and highly robust control of the fuel cell system can be performed. | 07-02-2009 |
20090208786 | FUEL CELL SYSTEM - There is provided a fuel cell system capable of notifying a user that control for low-temperature countermeasure is performed, without any strange feeling and false recognition. When control for low-temperature countermeasure such as scavenging at system termination or warm-up at system start-up is made, the user is reliably notified that the control is performed, by a text message or a speech message. Consequently, even in a situation where the system is operating after an ignition key is turned off, the user suffers neither strange feeling nor false recognition. | 08-20-2009 |
Patent application number | Description | Published |
20090051346 | Voltage Conversion Device and Vehicle - A DC/DC converter includes a reactor, IGBT devices, a dead time generation unit, and a DC-CPU. The dead time generation unit operates in response to a reference signal for a duty ratio, to output first and second activation signals provided with an inactive period corresponding to a dead time preventing both of the IGBT devices from conducting. The DC-CPU corrects a tentative duty ratio calculated as based on a voltage control value, in accordance with a value of a current flowing through the reactor, to output the reference signal. Preferably the DC-CPU associates the value of the current of the reactor with three states and when the value approaches a value at which a state transitions to a different state, the DC-CPU gradually switches a correction value. | 02-26-2009 |
20090105895 | Fuel Cell Vehicle - In a fuel cell vehicle according to one aspect of the invention, an amount of battery assist for a fuel cell stack is adequately set according to the setting of a mode position and an accelerator opening change rate. The driver's requirement for abrupt acceleration is inferred from a large value of the accelerator opening change rate. In this case, the amount of battery assist is increased to give a sufficient acceleration feeling to the driver. The driver's requirement for moderate acceleration is inferred, on the other hand, from a small value of the accelerator opening change rate. In this case, the amount of battery assist is reduced to restrict the acceleration and improve the fuel consumption. The setting of the mode position to a sports mode suggests the driver's preference to the acceleration over the fuel consumption. The amount of battery assist is thus increased to ensure the sufficient acceleration feeling. The setting of the mode position to an economic mode, on the other hand, suggests the driver's preference to the fuel consumption over the acceleration. The amount of battery assist is thus reduced to improve the fuel consumption. | 04-23-2009 |