Abstract: A control method for a polyphase step-up converter that drives step-up circuits, the step-up circuits being connected in parallel between an input terminal and an output terminal from which an output voltage supplied to a load circuit is output. The control method includes, in changing the frequency of each of driving signals from a first frequency to a second frequency while N circuits are being driven, determining whether the second frequency is M times as high as a resonance frequency of a resonance circuit provided between the polyphase step-up converter and the load circuit; and when the second frequency is M times as high as the resonance frequency, setting a phase difference between driving signals to a phase difference determined in accordance with a value of M.

Abstract: A control method for a polyphase step-up converter that drives step-up circuits, the step-up circuits being connected in parallel between an input terminal and an output terminal from which an output voltage supplied to a load circuit is output. The control method includes, in changing the frequency of each of driving signals from a first frequency to a second frequency while N circuits are being driven, determining whether the second frequency is M times as high as a resonance frequency of a resonance circuit provided between the polyphase step-up converter and the load circuit; and when the second frequency is M times as high as the resonance frequency, setting a phase difference between driving signals to a phase difference determined in accordance with a value of M.

Abstract: Here is disclosed a fuel cell system comprising: a fuel cell; a fuel gas system which supplies a fuel gas to the fuel cell and circulates the gas discharged from the fuel cell; a purge valve which discharges the gas from the fuel gas system; and control means for controlling the opening/closing operation of the purge valve. The control means controls the opening/closing operation of the purge valve so that impurities partial pressure in the fuel gas system is constant in the entire load region.

Abstract: There is disclosed a fuel cell system including a fuel cell, a fuel supply system to supply a fuel gas to the fuel cell, an injector which adjusts a gas state on an upstream side of the fuel supply system to supply the gas to a downstream side, and a control unit which drives and controls the injector in a predetermined drive cycle. The control unit sets the drive cycle of the injector in accordance with an operation state of the fuel cell.

Abstract: A fuel cell system of the present invention is provided with a fuel cell, a fuel gas supply system that supplies a fuel gas to the fuel cell, and an oxidant gas supply system that supplies an oxidant gas to the fuel cell, and, when operation end processing is started, a flow rate of the fuel gas supplied to the fuel cell is increased only by a predetermined amount that is determined based on a temperature environment of the fuel cell system. As a result, when the operation of the fuel cell system is ended, the fuel gas at the optimum flow rate in accordance with the temperature environment is provided, thereby efficiently preventing deterioration of the fuel cell after the end of the operation.

Abstract: A capacitor apparatus includes eight capacitor elements connected in parallel to an alternating-current current source. The impedance of a bus bar between the (j+1)th (j is 1 to 6) capacitor element and the (j+2)th capacitor element from a connecting terminal is (j+1) times the impedance of the bus bar between the first capacitor element and the second capacitor element from the connecting terminal. The impedance of the bus bar between the (j+1)th capacitor element and the (j+2)th capacitor element from a connecting terminal is (j+1) times the impedance of the bus bar between the first capacitor element and the second capacitor element from the connecting terminal.

Abstract: A control device for starting a fuel cell is provided which is capable of preventing an excessive reduction of the terminal voltage of the fuel cell. A primary precharge portion, provided with a high voltage switch and a current limiter, is disposed at the output portion of a power storage unit, and a secondary precharge portion, provided with a DC-DC chopper and a control portion, is disposed at the output side of a fuel cell. The primary precharge portion controls the output current to flow in a path via a resistor having a predetermined resistance. The secondary precharge portion controls an output current of the fuel cell based on a current command value IFCCMD for the fuel cell.

Abstract: The fuel cell system is provided with a fuel cell, a fuel supply system for supplying fuel gas to the fuel cell, an injector for regulating the gas state upstream in the fuel supply system and supplying the gas downstream, and control means for driving and controlling the injector at a predetermined drive cycle. The control means sets the working state of the injector in response to the operating state of the fuel cell.

Abstract: A fuel cell vehicle system includes: a propulsion motor capable of driving a vehicle; a fuel cell which generates electric power by supplying a reactant gas to give an electrochemical reaction; an energy storage device which is charged by a generated output of the fuel cell and regenerative electric power of the propulsion motor; an output control device which controls an output current of the fuel cell; and a control device which calculates the regenerative electric power which can be generated by a regenerative operation of the propulsion motor as well as a chargeable power which can be charged to the energy storage device, controls the output control device so that the output current of the fuel cell is restricted when the chargeable power is less than the regenerative electric power, and controls the output control device so that restriction on the output current of the fuel cell is canceled when the chargeable power is equal to or greater than the regenerative electric power.

Abstract: There is disclosed a fuel cell system including a fuel cell, a fuel supply system to supply a fuel gas to the fuel cell, an injector which adjusts a gas state on an upstream side of the fuel supply system to supply the gas to a downstream side, and a control unit which drives and controls the injector in a predetermined drive cycle. The control unit sets the drive cycle of the injector in accordance with an operation state of the fuel cell.

Abstract: A control device for starting a fuel cell is provided which is capable of preventing an excessive reduction of the terminal voltage of the fuel cell. A primary precharge portion, provided with a high voltage switch and a current limiter, is disposed at the output portion of a power storage unit, and a secondary precharge portion, provided with a DC-DC chopper and a control portion, is disposed at the output side of a fuel cell. The primary precharge portion controls the output current to flow in a path via a resistor having a predetermined resistance. The secondary precharge portion controls an output current of the fuel cell based on a current command value IFCCMD for the fuel cell.

Abstract: The fuel cell system is provided with a fuel cell, a fuel supply system for supplying fuel gas to the fuel cell, an injector for regulating the gas state upstream in the fuel supply system and supplying the gas downstream, and control means for driving and controlling the injector at a predetermined drive cycle. The control means sets the working state of the injector in response to the operating state of the fuel cell.

Abstract: A control device for starting a fuel cell is provided which is capable of preventing an excessive reduction of the terminal voltage of the fuel cell. A primary precharge portion, provided with a high voltage switch and a current limiter, is disposed at the output portion of a power storage unit, and a secondary precharge portion, provided with a DC-DC chopper and a control portion, is disposed at the output side of a fuel cell. The primary precharge portion controls the output current to flow in a path via a resistor having a predetermined resistance. The secondary precharge portion controls an output current of the fuel cell based on a current command value IFCCMD for the fuel cell.

Abstract: A fuel cell system of the present invention is provided with a fuel cell, a fuel gas supply system that supplies a fuel gas to the fuel cell, and an oxidant gas supply system that supplies an oxidant gas to the fuel cell, and, when operation end processing is started, a flow rate of the fuel gas supplied to the fuel cell is increased only by a predetermined amount that is determined based on a temperature environment of the fuel cell system. As a result, when the operation of the fuel cell system is ended, the fuel gas at the optimum flow rate in accordance with the temperature environment is provided, thereby efficiently preventing deterioration of the fuel cell after the end of the operation.

Abstract: Here is disclosed a fuel cell system comprising: a fuel cell; a fuel gas system which supplies a fuel gas to the fuel cell and circulates the gas discharged from the fuel cell; a purge valve which discharges the gas from the fuel gas system; and control means for controlling the opening/closing operation of the purge valve. The control means controls the opening/closing operation of the purge valve so that impurities partial pressure in the fuel gas system is constant in the entire load region.

Abstract: A fuel cell system (1) is provided with a fuel cell (10); a fuel supply system (3) for supplying the fuel cell (10) with a fuel gas; an injector (35) for adjusting a pressure on the upstream side of the fuel supply system (3) and supplying the gas downstream; a control means (4) for controlling the injector (35) to be driven in a prescribed drive cycle. The control means (4) sets the operation status of the injector (35) corresponding to the operation status of the fuel cell (10). The operation status of the injector (opening degree of an injector valve (gas passing area), open time of the injector valve (gas injecting time) and the like) can be set corresponding to the operation status of the fuel cell (electricity generated by the fuel cell (power, current and voltage), fuel cell temperature, abnormal state of the fuel cell system, abnormal state of the fuel cell main body, and the like).

Abstract: There is disclosed a fuel cell system including a fuel cell, a fuel supply system to supply a fuel gas to the fuel cell, an injector which adjusts a gas state on an upstream side of the fuel supply system to supply the gas to a downstream side, and a control unit which drives and controls the injector in a predetermined drive cycle. The control unit sets the drive cycle of the injector in accordance with an operation state of the fuel cell.

Abstract: A fuel cell system includes a fuel cell, a hydrogen gas pipework system for supplying hydrogen gas to the fuel cell, an injector which adjusts the gas state of the hydrogen gas pipework system in its upstream side and supplies it to its downstream side, and a control device which controls the drive of the injector in a predetermined drive period. This control device judges the presence of an abnormality in the hydrogen gas pipework system, based on a target injection amount for the injector and the detected pressure in the hydrogen gas pipework system.

Abstract: A fuel cell vehicle system includes: a propulsion motor capable of driving a vehicle; a fuel cell which generates electric power by supplying a reactant gas to give an electrochemical reaction; an energy storage device which is charged by a generated output of the fuel cell and regenerative electric power of the propulsion motor; an output control device which controls an output current of the fuel cell; and a control device which calculates the regenerative electric power which can be generated by a regenerative operation of the propulsion motor as well as a chargeable power which can be charged to the energy storage device, controls the output control device so that the output current of the fuel cell is restricted when the chargeable power is less than the regenerative electric power, and controls the output control device so that restriction on the output current of the fuel cell is canceled when the chargeable power is equal to or greater than the regenerative electric power.

Abstract: An idle control system applicable to a fuel cell vehicle 1 is provided for improving the fuel efficiency. When the fuel cell vehicle is determined to be in a predetermined idle mode, the idle control system stops a compressor to thereby stop power generation of a fuel cell. In contrast, when the state of charge of the capacitor 4 falls below a predetermined value while the fuel cell vehicle is in the idle mode, the idle control system drives the compressor 8 by means of the capacitor to drive the fuel cell in order to charge the capacitor.