A method of driving a fuel cell-based vehicle may include determining whether the vehicle is in an ignition entry state, determining an open-circuit voltage of a battery that provides a voltage to the air compressor based on the vehicle being in the ignition entry state, determining a drive current provided to the air compressor from the battery based on the open-circuit voltage, and driving the air compressor based on the drive current.

A vehicle includes a fuel cell stack, a traction battery, at least one DC/DC converter electrically coupling the fuel cell stack and the traction battery to a DC bus, an electric machine coupled to the DC bus via an inverter, and a controller programmed to control the at least one DC/DC converter to provide a DC bus voltage to maximize efficiency of the electric machine based on torque, rotational speed, and temperature of the electric machine.

An energy conversion system includes an energy converter, a cold generator, and a liquid water obtainer. The energy converter is configured to convert energy of a source from one form to another form and generate heat and water vapor. The cold generator is configured to generate cold using the heat generated by the energy converter. The liquid water obtainer is configured to condense the water vapor using the cold to obtain liquid water. Accordingly, the water vapor generated from the energy converter can be cooled efficiently. Therefore, efficiency in obtaining the liquid water can be improved compared with a case where the water vapor is cooled by open air.

Provided is an expander including: an expanding chamber that expands a working fluid introduced and discharges the expanded working fluid; a driving chamber housing a driving mechanism that is driven by expansion energy of the working fluid; an intermediate chamber interposed between the expanding chamber and the driving chamber ; a first seal member that seals a gap between the expanding chamber and the intermediate chamber ; a second seal member that seals a gap between the driving chamber and the intermediate chamber ; and a pressurizing unit that pressurizes a pressurized fluid filling the intermediate chamber.

A fuel cell system includes a combined cooling circuit for a motor vehicle that provides a method of cooling a fuel cell of a fuel cell system.

A fuel cell system includes a combined cooling circuit for a motor vehicle that provides a method of cooling a fuel cell of a fuel cell system.

A fuel cell system includes: an upstream side flow path forming a flow path from an oxidation gas supply apparatus toward a fuel cell; and a downstream side flow path forming a flow path from the fuel cell toward an atmosphere. The fuel cell system includes: an oxidation gas pressure sensor that measures a pressure inside the upstream side flow path; and a controller that can execute a water content estimation mode of estimating a water content in an oxidation gas flow path including the fuel cell. The controller includes: a water content calculation unit that calculates the water content in the oxidation gas flow path including the fuel cell on a basis of an oxidation gas flow rate and an oxidation gas pressure loss.

A system for cooling a battery of an electrified vehicle includes a vehicle air-conditioning system having a first cooling circuit in which a first cooling medium circulates, a second cooling circuit in which a second cooling medium circulates, a cooling unit in thermal contact with the battery, wherein the second cooling medium flows through the cooling unit, and with a heat exchanger through which the first and second cooling media flow in separate channels which are in thermal contact, wherein in the heat exchanger, heat is discharged from the second cooling medium towards the first cooling medium.

An outer surface of an upper wall of a stack case of a fuel cell system provided in a fuel cell vehicle includes a first outer surface, a second outer surface which is positioned closer than the first outer surface to a cell stack body, and an outer surface coupling part. Space is formed between a first upper wall of the upper wall and the cell stack body. Tabs and bus bars are disposed in the space.

A fuel cell module has: a first stacked body including a plurality of unit cells stacked on each other; and a second stacked body including a plurality of magnetic body sheets stacked on each other. The magnetic body sheets includes a coil. The first stacked body is superposed on the second stacked body so as to be electrically connected to the coil. A conductor serving as a part of the coil is embedded in each magnetic body sheet. The conductor has a first end portion and a second end portion exposed from surfaces of each magnetic body sheet on opposite sides from each other. The first end portion of the conductor of one of a set of magnetic body sheets adjacent to each other, among the magnetic body sheets, contacts the second end portion of the conductor of the other of the set of magnetic body sheets.