Abstract: A fuel cell includes metallic separators and has an anode-gas channel, a cathode-gas channel, and a coolant channel. The metallic separators include a flat separator and a channel-equipped separator. A peripheral edge of a manifold of the channel-equipped separator whose first surface has a channel serving as the coolant channel is provided with a step. The step surrounds the peripheral edge of the manifold to increase a height of a gas inlet disposed at a second surface of the channel-equipped separator. A shortened seal member having a thickness smaller than a thickness of a peripheral seal member provided in a region other than the peripheral edge of the manifold is disposed on the step to surround the peripheral edge of the manifold.

Abstract: A fuel cell system includes a mass flow rate measuring unit, an oxygen consumption mass flow rate acquiring unit, an exhaust-side air temperature acquiring unit, and an exhaust-side air humidity estimating unit. The mass flow rate measuring unit measures a first mass flow rate of intake-side air and a second mass flow rate of exhaust-side air. The oxygen consumption mass flow rate acquiring unit acquires a mass flow rate of oxygen consumption. The exhaust-side air humidity estimating unit estimate humidity in the exhaust-side air, on the basis of a difference between a flow rate of intake gas in the fuel cell system and a flow rate of exhaust gas from the fuel cell system, and the mass flow rate of the oxygen consumption.

Abstract: A fuel cell system includes a fuel cell, a supercharger, a coolant circuit, a pump controller, and a pressure regulating mechanism. The supercharger applies pressure to cathode gas and supplies the cathode gas to the fuel cell. The coolant circuit has a coolant circulation pump and a cooler and circulates a coolant to be supplied to a coolant channel in the fuel cell. The pressure regulating mechanism regulates coolant pressure in the fuel cell. The pump controller controls a rotation speed of the pump in accordance with a heat release amount required by the fuel cell and controls the pump in a range lower than or equal to an upper limit for the rotation speed set based on one or both of inlet coolant pressure of the pump or a correlation value thereof and an inlet coolant temperature of the pump or a correlation value thereof.

Abstract: An exhaust hydrogen dilution device includes a purge receiving chamber to store hydrogen purged from a fuel cell of a fuel cell system and an air passage chamber adjoining the purge receiving chamber. Diluter gas flows through the air passage chamber. An interface member between the chambers comprises an interface member having first and second vents respectively on an upstream side and a downstream side. A pressure loss at the first vent is greater than or equal to a pressure loss at the second vent. Some of the diluter gas flows into the purge receiving chamber through the first vent and is mixed with the hydrogen into a mixed gas that flows toward the second vent. The pressure losses are adjusted such that a ratio of the hydrogen flowing into the air passage chamber to a total amount of gases flowing through the air passage chamber is 4% or lower.

Abstract: A fuel cell system includes a fuel cell, a supercharger, a coolant circuit, a pump controller, and a pressure regulating mechanism. The supercharger applies pressure to cathode gas and supplies the cathode gas to the fuel cell. The coolant circuit has a coolant circulation pump and a cooler and circulates a coolant to be supplied to a coolant channel in the fuel cell. The pressure regulating mechanism regulates coolant pressure in the fuel cell. The pump controller controls a rotation speed of the pump in accordance with a heat release amount required by the fuel cell and controls the pump in a range lower than or equal to an upper limit for the rotation speed set based on one or both of inlet coolant pressure of the pump or a correlation value thereof and an inlet coolant temperature of the pump or a correlation value thereof.

Abstract: An electric power system for a vehicle includes an exhaust heat recovery apparatus, a low-voltage system, a high-voltage system, a first wiring line, a second wiring line, and a DC/DC converter. The exhaust heat recovery apparatus includes a power generator that generates electric power on the basis of heat exhausted from a heating element. The low-voltage system includes a low-voltage secondary battery. The high-voltage system includes a high-voltage secondary battery that outputs a voltage higher than the low-voltage secondary battery. The first wiring line couples the power generator and the low-voltage system. The second wiring line couples the first wiring line and the high-voltage system. The DC/DC converter is disposed on the second wiring line and increases and decreases a voltage supplied to the DC/DC converter.

Abstract: A fuel cell system includes a mass flow rate measuring unit, an oxygen consumption mass flow rate acquiring unit, an exhaust-side air temperature acquiring unit, and an exhaust-side air humidity estimating unit. The mass flow rate measuring unit measures a first mass flow rate of intake-side air and a second mass flow rate of exhaust-side air. The oxygen consumption mass flow rate acquiring unit acquires a mass flow rate of oxygen consumption. The exhaust-side air humidity estimating unit estimate humidity in the exhaust-side air, on the basis of a difference between a flow rate of intake gas in the fuel cell system and a flow rate of exhaust gas from the fuel cell system, and the mass flow rate of the oxygen consumption.

Abstract: An electric power system for a vehicle includes an exhaust heat recovery apparatus, a low-voltage system, a high-voltage system, a first wiring line, a second wiring line, and a DC/DC converter. The exhaust heat recovery apparatus includes a power generator that generates electric power on the basis of heat exhausted from a heating element. The low-voltage system includes a low-voltage secondary battery. The high-voltage system includes a high-voltage secondary battery that outputs a voltage higher than the low-voltage secondary battery. The first wiring line couples the power generator and the low-voltage system. The second wiring line couples the first wiring line and the high-voltage system. The DC/DC converter is disposed on the second wiring line and increases and decreases a voltage supplied to the DC/DC converter.