Abstract:
PROBLEM TO BE SOLVED: To provide a fuel cell hybrid system of high energy efficiency. SOLUTION: The fuel cell hybrid system includes a fuel cell, an auxiliary power source (battery or the like) for assisting it, an air compressor (ACP) for supplying air to the fuel cell. In the system, charging of the auxiliary power source is performed based on the generated power of the ACP and motor (MG) (steps S102-S104) when operation of the ACP stops (step S101). COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a fuel cell moving body capable of suppressing the theft of a vehicle by suppressing unauthorized getting on of the vehicle and unauthorized starting. SOLUTION: This fuel cell vehicle S, with a fuel cell 10 mounted as a drive source, comprises an opening/closing sensor 81 detecting opening/closing of an opening/closing part 110, such as, a door or a window of the vehicle S; an alarm part 83 giving an alarm; and a control device 4, outputting an alarm from the alarm 83, when determining that the opening/closing part 110, such as door or window, is opened in unauthorized manner based on a detection signal from the opening/closing sensor 81. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a fuel cell system surely suppressing the discharge of fluorine ions and metal ions. SOLUTION: The fuel cell system includes a fuel cell 12 generating electric power with anode gas containing hydrogen supplied to an anode and cathode gas containing oxygen supplied to a cathode; ion removing membranes 28, 42 reducing the amount of ions contained in moisture discharged from the fuel cell 12; ion detecting means (an ion detector 54 and a flow rate detector 58) detecting the amount of ions contained in moisture discharged from the fuel cell 12 or ion concentration in the moisture discharged from the fuel cell 12; and a flow rate control valve 60 for controlling the discharged water amount from the fuel cell on the basis of the amount of ions or the ion concentration. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a fuel cell system which can step up the output voltage of a fuel cell by soft switching, and to provide a step-up converter for fuel cell. SOLUTION: A fuel cell system 10 comprises a fuel cell 11, i.e. a DC power supply, and a step-up means 12a for supplying the output voltage of a fuel cell 11 to a load while stepping up, wherein the step-up means 12a comprises a main step-up section 12a having a switch S1 and a coil L1 and stepping up the output voltage of the fuel cell 11 with a counter electromotive force of the coil L1 produced when the switch S1 performs switching operation for the coil L1, and a sub step-up section 12b having a snubber capacitor C2 for regulating the potential difference between both poles of the switch S1 by the amount of stored power and reducing the switching loss of the switch S1 by regulating the amount of power stored in the snubber capacitor C2 during switching operation, and the sub step-up section 12b feeds the electricity of the snubber capacitor C2, which is discharged when the amount of stored power is reduced, to the processing means 12a (13) of other than the fuel cell 11 and processes the electricity. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a fuel cell system which has a better cost performance than an existing fuel cell system with a multi-phase converter. SOLUTION: In the fuel cell system 10, the output voltage of a fuel cell 11 is boosted by an FC step-up converter 12 in which step-up switching converters 30v and 30w and a step-up switching converter 30u having a higher function than the step-up switching converters 30v and 30w are connected in parallel. At the time of a low loading, only the step-up switching converter 30u is driven. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To restore characteristics of a fuel cell degraded due to oxide film formation on an electrode catalyst. SOLUTION: A control part 80, when an open-end voltage OCV by detection of a voltage sensor 85 is at a reference voltage Vth or higher at start-up of the fuel cell 20, commands a converter 83 to perform a low-efficiency power generation operation for maintaining reduction-promoting voltage at which oxide formed at the electrode catalyst of the fuel cell 20 can be reduced, and a drive of an air compressor 75 is stopped. When a control for reducing an output voltage is carried out by the converter 83 and supply of oxidizing gas to the fuel cell 20 is stopped due to drive stoppage of the air compressor 75, an open-end voltage of the fuel cell 20 gradually falls in accordance with fall of the output voltage of the converter 83, and reduction reaction at the catalyst layer of the fuel cell 20 is promoted to have the catalyst layer activated. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To presume more precisely nitrogen concentration in a fuel cell stack and to suppress deterioration of lifetime of an anode due to operation at increased impurity concentration. SOLUTION: The fuel cell system is provided with a stack temperature detection means 11 to detect the temperatures of a fuel cell stack 20, a fuel electrode pressure detection means P5 to detect the pressure of a fuel electrode, and a standing time measuring means 12 to detect shelf standing time. The fuel electrode nitrogen concentration which shows the concentration of nitrogen in a fuel electrode of the fuel cell (for example, nitrogen reached to the fuel electrode from an oxygen electrode by permeating through the electrolyte membrane) is presumed basing on the temperatures of the fuel cell stack at the time of operation stop, the pressure of the fuel electrode at the time of restarting the fuel cell, and a standing time from the stop of the fuel cell to the restarting. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress switching loss as much as possible in a voltage step-up converter such as a DC-DC converter for stepping up output voltage from a DC power supply unit such as a fuel cell. SOLUTION: The fuel cell system is provided with: a voltage step-up section including a main voltage step-up section for causing a main switch means to perform a switching operation for a main coil connected to a terminal of a high potential side of the fuel cell so that an output voltage of the fuel cell is stepped up, and an auxiliary voltage step-up section having a snubber capacitor connected in parallel to the main switch means and capable of adjusting a voltage applied to the main switch means, and adjusting an applied voltage of the snubber capacitor in response to the voltage step-up operation by the main voltage step-up section; a voltage step-up control means for stepping up the output voltage of the fuel cell via the voltage step-up section and applying the stepped-up voltage to a load; and a voltage step-up ratio adjusting means for adjusting the exit voltage of the voltage-step up section so that a ratio of the exit voltage of the voltage step-up section to the output voltage of the fuel cell can exceed a predetermined voltage step-up ratio when applying the stepped-up voltage to the load. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To optimally control an operation state of a fuel cell by a simple structure without detecting a wet state inside the fuel cell in a fuel cell system. SOLUTION: A control part is started (S100), a detecting means detects unique information from a memory part to memorize the unique information related to the fuel cell (S101). Based on the unique information detected by the detecting means, characteristics of wet state inside the fuel cell is determined by a determining means (S102), and corresponding to the characteristics of the wet state determined by the determining means, the control means controls a fluid supplied to the fuel cell (S103). By this, without detecting the wet state inside the fuel cell, the operation state of the fuel cell can be controlled optimally. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a degradation determination system for a fuel cell capable of accurately determining degradation of the fuel cell while restraining its manufacturing cost. SOLUTION: A control device calculates activated overvoltage on the basis of an amount of generated electricity (from a step S120 to a step S130) at the time of reduction of catalyst of respective cells forming the fuel cell, and estimates FC voltage from the calculated activated overvoltage (a step S140). Then, the estimated FC voltage is compared with actual FC voltage detected by a voltage sensor, and determines degradation of the fuel cell on the basis of the comparison results (a step S150). COPYRIGHT: (C)2009,JPO&INPIT