Abstract: A fuel cell system including: a fuel cell; a voltage sensor that measures output voltage of the fuel cell; a converter that boosts the output voltage; and a control unit that controls the converter using a duty ratio including a feedforward term and a feedback term, the feedforward term being set to perform feedforward control, the feedback term being set to perform feedback control, wherein when the control unit causes the converter to boost the output voltage, and when the feedforward term calculated by specified Expression I exceeds an upper limit calculated by specified Expression II, the control unit causes the converter to boost the voltage output from the fuel cell with the duty ratio including the upper limit and the feedback term.

Abstract: There is provided a method of controlling a fuel cell system comprising a fuel cell, a tank that is configured to store a fuel gas filled through a filler port of fuel gas provided in an outer plate of a vehicle, and a main stop valve that is configured to change over between opening and closing to open and close a fuel passage arranged from the tank to the fuel cell. The method comprises controlling the main stop valve to change over from opening to closing in response to detection of an operation for gas filling to fill the fuel gas into the tank, when a control accompanied with opening of the main stop valve is performed during a stop of the vehicle.

Abstract: A fuel cell system that includes a fuel cell and a secondary battery, each acting as a power supply source. A first converter a second converter is provided between the fuel cell and the secondary battery and first and second loads. A first inverter is provided between the first and second converters and the first load and a second inverter is provided between the first and second converters and the second load. A first controller controls an output of the fuel cell by controlling the first converter, and a second controller is configured separately from the first controller. If one of the first controller and the second controller receives the failure information sent from the other, the first controller or the second controller that has received the failure information stops operation of the control target thereof.

Abstract: There is provided a fuel cell system. This fuel cell system comprises a fuel cell configured to generate electric power using reactive gases; a voltage sensor configured to measure a voltage output from the fuel cell; a converter configured to boost an input voltage that is input from the fuel cell; and a controller configured to control the converter. In the case where the voltage output from the fuel cell to the converter is to be boosted after a changeover of an operating state of the fuel cell system from an intermittent operation to an ordinary operation, when a duty ratio D1 calculated by Mathematical Formula I is greater than a duty ratio D2 calculated by Mathematical Formula II, the controller causes the converter to boost the voltage output from the fuel cell at the duty ratio D2. [ Math .

Abstract: A voltage control system includes: a converter controlling portion; a current value acquisition portion; and a voltage value acquisition portion. The converter controlling portion sets a duty ratio in a present cycle by adding an addition term to a feedforward term, the addition term being determined by use of a current deviation, which is a difference between a target value of an output current in the present cycle and a current measured value in a previous cycle, and the duty ratio in the previous cycle, the addition term being corresponding to an increase of the output current in the present cycle.

Abstract: A voltage control system includes a converter device, and a controller configured to set a duty ratio according to a current target value so as to cause the converter device to repeatedly perform a boost operation according to the duty ratio. The controller is configured to set the duty ratio by use of a basic term including a feedforward term, and an additional term, the feedforward term being derived by use of a measured value of a magnitude of an input of a reactor provided in the converter device and a measured value of a magnitude of an output of the reactor or by use of respective target values of the magnitude of the input and the magnitude of the output in the reactor, the additional term being derived by use of the variation of the current target value during one cycle.

Abstract: A guide wire has a wire body; and a distal side coating layer that covers a distal portion of the wire body. The guide wire has a cylindrical member that has an outer diameter substantially the same as an outer diameter of a proximal portion of the distal side coating layer, that encircles a portion of the wire body and that has a distal portion positioned proximate the proximal portion of the distal side coating layer; and a joint member that is disposed at a proximal side of the cylindrical member and joins the cylindrical member and the wire body. The joint member has a gradually decreasing outer diameter portion whose outer diameter gradually decreases toward a proximal side of the wire body, and an outer peripheral surface of the cylindrical member has a surface continuous with the gradually decreasing outer diameter portion.

Abstract: A fuel cell system includes: a fuel cell; a coolant path connected to the fuel cell and allowing a coolant that cools the fuel cell to flow therethrough; a temperature detection unit configured to detect a temperature of the coolant in the coolant path; a temperature correction unit configured to calculate a temperature correction value by correcting the temperature of the coolant detected by the temperature detection unit; and a lower limit voltage control unit configured to control a lower limit voltage of the fuel cell based on the temperature correction value, wherein the temperature correction unit calculates the temperature correction value based on a following equation: T filt = T filt ? _ ? old + T - T filt ? _ ? old ? where Tfilt represents the temperature correction value, Tfilt_old represents a last temperature correction value, T represents the temperature of the coolant, and ? represents a coefficient, and the coefficient when the temperature of the coolant is less than a

Abstract: A guidewire is disclosed, which includes a core member that is an elongated member having flexibility, and a coil member that is disposed so as to cover a distal portion of the core member and that is formed by helically winding a strand, the coil member being fixed to the core member in a distal portion of the guidewire. The core member includes a body portion in a proximal portion thereof and a flat portion in the distal portion thereof. At least one projection is formed on at least one of two side surfaces of the flat portion extending in a longitudinal direction, the at least one projection projecting into a space between adjacent turns of the strand and being in contact with the strand.

Abstract: A guide wire is disclosed, which includes a core portion formed of an elongated object having flexibility, in which the core portion includes a main body portion formed on a proximal side, a flat plate portion formed on a distal side, and a transition portion which connects the main body portion and the flat plate portion, and in which at least one groove portion extending in a direction different from a length direction is formed on a slope of the transition portion in the length direction. In addition, the guide wire includes a coil portion disposed so as to cover the distal side of the core portion.

Abstract: A guide wire includes an elongated wire body having flexibility; a distal member that covers a distal portion of the wire body and is configured to have a resin material; and a hydrophilic lubricant layer that is formed so as to cover a proximal end of the distal member and is configured to have a hydrophilic material. In addition, the hydrophilic lubricant layer has a tapered shape whose outer diameter gradually decreases toward a proximal side. In addition, the maximum outer diameter of the hydrophilic lubricant layer is smaller than the maximum outer diameter of the distal member. In addition, a proximal portion of the distal member has a tapered shape whose outer diameter gradually decreases toward the proximal side, and a distal end of the hydrophilic lubricant layer is positioned at the tapered portion of the distal member.

Abstract: There is provided a method of controlling a fuel cell system comprising a fuel cell, a tank that is configured to store a fuel gas filled through a filler port of fuel gas provided in an outer plate of a vehicle, and a main stop valve that is configured to change over between opening and closing to open and close a fuel passage arranged from the tank to the fuel cell. The method comprises controlling the main stop valve to change over from opening to closing in response to detection of an operation for gas filling to fill the fuel gas into the tank, when a control accompanied with opening of the main stop valve is performed during a stop of the vehicle.

Abstract: A fuel cell system includes: a fuel cell; a coolant path connected to the fuel cell and allowing a coolant that cools the fuel cell to flow therethrough; a temperature detection unit configured to detect a temperature of the coolant in the coolant path; a temperature correction unit configured to calculate a temperature correction value by correcting the temperature of the coolant detected by the temperature detection unit; and a lower limit voltage control unit configured to control a lower limit voltage of the fuel cell based on the temperature correction value, wherein the temperature correction unit calculates the temperature correction value based on a following equation: T filt = T filt ? _ ? old + T - T filt ? _ ? old ? where Tfilt represents the temperature correction value, Tfilt_old represents a last temperature correction value, T represents the temperature of the coolant, and ? represents a coefficient, and the coefficient when the temperature of the coolant is less than a

Abstract: The present invention provides a technique capable of satisfying both the restoration of an output voltage of a fuel cell and an improvement of electric power responsiveness in a fuel cell system in a situation in which its operation status is restored to a normal operation from an operation having low power generation efficiency. A controller updates a lower limit voltage threshold in accordance with the restoration of an FC voltage until the operation status is restored to a normal operation from an operation having low power generation efficiency, such as an intermittent operation and a warmup operation (step S1). The controller increases an FC current in accordance with the updated lower limit voltage threshold (steps S2 and S3) to thereby satisfy both the requirements of the restoration of the output voltage of the fuel cell stack and the improvement of the electric power responsiveness.

Abstract: A fuel cell system mounted in a vehicle includes a fuel cell supplying electric power to a motor driving the vehicle, a pump supplying oxygen to the fuel cell, an accelerator position detection unit detecting an accelerator depression amount of the vehicle, and a control unit calculating electric power required to be generated by the fuel cell and electric power required for driving of the pump based on the accelerator depression amount and controlling the pump based on the electric power required for the driving, in which the control unit calculates the electric power required for the driving such that a rate of increase in the electric power required for the driving exceeds a rate of increase in the electric power required to be generated when the calculated electric power required to be generated increases.

Abstract: The present invention enables the determination of an operating point of a fuel cell so as to prioritize the fulfillment of an amount of required power generation while avoiding various limitations, such as a current limit, in a fuel cell system that warms up the fuel cell by a low efficiency operation. A controller 70 multiplies a voltage command value Vcom obtained in step S3 by a current command value Icom obtained in step S1, then, this is divided by a final voltage command value Vfcom obtained in step S4, thereby obtaining a final current command value Ifcom to determine an operating point (Ifcom, Vfcom) during a warm-up operation (step S5), and then the process ends.

Abstract: A fuel cell system comprising: a power generation controller that controls a value subject to control, which is a value exhibiting a power generating state by a fuel cell and is a value that is affected by alternating current applied to the fuel cell, to approach a target value; a dead zone setter that sets a dead zone with the target value as a reference; and, a stopper that stops the control by the power generation controller when the value subject to control is contained in the dead zone.

Abstract: A fuel cell system in which power generation is performed by a fuel cell, comprising: a power generation controller that performs: first control in which at least one of power control for preventing generated power from exceeding an upper limit value, voltage control for preventing generated voltage from falling below a lower limit value and current control for preventing generated current from exceeding an upper limit value is performed and second control in which the generated voltage is prevented from exceeding an upper limit value; and a priority instructor that instructs the power generation controller to prioritize the first control over the second control when the first control and the second control collide with each other.

Abstract: A fuel cell system includes: a fuel cell outputting a current; a supply unit supplying oxidant gas; a flow-amount measurement unit measuring a flow amount of the oxidant gas; and a controller that feed-back controls the supply unit such that a measured flow-amount value converges toward a target flow-amount value, wherein the controller determines an acceptable current value in accordance with the measured flow-amount value, restricts the current to the acceptable current value or less, controls the current in accordance with a requested current value of the fuel cell; and performs a changing-suppression processing, when a condition continues for a predetermined period, the condition including that a changing width of the requested current value is equal to or less than a first value and a difference between the requested current value and the acceptable current value is equal to or less than a second value.

Abstract: A thrombus aspiration catheter is disclosed which can shear a thrombus and efficiently aspirate the thrombus. When the pressure of the inside of an inner tube is made negative, an outer tube is rotated around an axis relative to the inner tube, and an inner opening portion and an outer opening portion are positioned at an open position at which the inner opening portion and the outer opening portion overlap each other, a thrombus enters the inside of the inner tube through the inner opening portion and the outer opening portion. When the outer tube is further rotated up to a closed position at which the whole outer opening portion does not overlap the inner opening portion, the thrombus is sheared by an edge portion of the inner opening portion and an edge portion of the outer opening portion and into the inside of the inner tube.