A fuel cell vehicle comprises a fuel cell module configured to include a fuel cell stack, a tank configured to store a gas that is supplied to the fuel cell stack, a fuel cell placement chamber configured to place the fuel cell module therein and a tank placement chamber formed on a rear side of the fuel cell placement chamber in a vehicle longitudinal direction of the fuel cell vehicle under a floor of the fuel cell vehicle and configured to place the tank therein. The fuel cell module is placed vertically above the tank such as not to overlap with the tank when being viewed in the vehicle longitudinal direction.

A fuel cell vehicle comprises a fuel cell module configured to include a fuel cell stack, a tank configured to store a gas that is supplied to the fuel cell stack, a fuel cell placement chamber configured to place the fuel cell module therein and a tank placement chamber formed on a rear side of the fuel cell placement chamber in a vehicle longitudinal direction of the fuel cell vehicle under a floor of the fuel cell vehicle and configured to place the tank therein. The fuel cell module is placed vertically above the tank such as not to overlap with the tank when being viewed in the vehicle longitudinal direction.

A gas detection device includes a gas sensor and a drive circuit. The drive circuit includes a measurement circuit, a power supply circuit, and a control circuit. The gas sensor includes a first electrode, a second electrode, a metal-oxide layer disposed between the first electrode and the second electrode, and an insulating film that covers the first electrode, the second electrode, and the metal-oxide layer, and has an opening that exposes part of a main surface of the second electrode. A resistance value of the metal-oxide layer decreases when gas containing hydrogen atoms contact the second electrode. When the resistance value of the metal-oxide layer falls outside a predetermined range, the drive circuit applies a predetermined voltage between the first electrode and the second electrode to restore the resistance value of the metal-oxide layer back into the predetermined range.

A gas detection device includes a gas sensor and a drive circuit. The drive circuit includes a measurement circuit, a power supply circuit, and a control circuit. The gas sensor includes a first electrode, a second electrode, a metal-oxide layer disposed between the first electrode and the second electrode, and an insulating film that covers the first electrode, the second electrode, and the metal-oxide layer, and has an opening that exposes part of a main surface of the second electrode. A resistance value of the metal-oxide layer decreases when gas containing hydrogen atoms contact the second electrode. When the resistance value of the metal-oxide layer falls outside a predetermined range, the drive circuit applies a predetermined voltage between the first electrode and the second electrode to restore the resistance value of the metal-oxide layer back into the predetermined range.

A fuel cell vehicle has a front compartment accommodating a hydrogen pump provided to a pipe through which fuel gas is supplied, and a gas-liquid separator that is fastened to the hydrogen pump and removes water from the fuel gas flowing through the pipe, the gas-liquid separator having an end portion on a backward side in a travelling direction arranged more on the backward side than an end portion of the hydrogen pump on the backward side in the travelling direction. A fastening portion, at which the hydrogen pump and the gas-liquid separator are fastened to each other, has a center of gravity C.sub.GLS shifted from a center of gravity C.sub.HP of the hydrogen pump in a width direction of the fuel cell vehicle, in the fuel cell vehicle as viewed in a vertical direction.

A fuel cell vehicle has a front compartment accommodating a hydrogen pump provided to a pipe through which fuel gas is supplied, and a gas-liquid separator that is fastened to the hydrogen pump and removes water from the fuel gas flowing through the pipe, the gas-liquid separator having an end portion on a backward side in a travelling direction arranged more on the backward side than an end portion of the hydrogen pump on the backward side in the travelling direction. A fastening portion, at which the hydrogen pump and the gas-liquid separator are fastened to each other, has a center of gravity C.sub.GLS shifted from a center of gravity C.sub.HP of the hydrogen pump in a width direction of the fuel cell vehicle, in the fuel cell vehicle as viewed in a vertical direction.

A hydrogen detection apparatus includes a hydrogen sensor, a sensor control circuit that senses the resistance value of the hydrogen sensor, and a microcomputer that sets an off time that differs depending on an operating environment and intermittently drives the sensor control circuit. The hydrogen sensor includes a first electrode; a metal-oxide layer disposed on the first electrode, and in which a resistance value changes in response to contacting hydrogen atoms; a second electrode disposed on the metal-oxide layer; and an insulating film that covers at least a portion of lateral surfaces of the first electrode, the metal-oxide layer, and the second electrode. A portion of at least one of (i) a first interface between the first electrode and the metal-oxide layer and (ii) a second interface between the second electrode and the metal-oxide layer is uncovered by the insulating film and exposed to a detection space.

A fuel cell vehicle includes: a fuel cell; a water storage tank; a spray nozzle connected to the water storage tank via water supply pipes and opposed to a to-be-cleaned object; a first pump configured to send the fuel-cell generated water in the water storage tank to the spray nozzle via the water supply pipes; and at least one electronic control unit configured to determine, based on an operating condition and an outside air temperature of the fuel cell vehicle, whether there is a possibility that the fuel-cell generated water inside the water storage tank and the water supply pipes will freeze within a predetermined time and cause the first pump to operate to spray the fuel-cell generated water from the spray nozzle to the to-be-cleaned object when it is determined that there is no possibility that the fuel-cell generated water will freeze within the predetermined time.

A vehicle includes a body, a fuel cell stack supported by the body for tilting relative thereto, a pivoting system and at least one control module. The fuel cell stack includes a fuel cell operable to generate electrical energy using fuel and exhaust water as a byproduct, and an exhaust water drainage port in fluid communication with the fuel cell. The pivoting system is mechanically connected between the body and the fuel cell stack, and operable to selectively tilt the fuel cell stack relative to the body. The at least one control module is communicatively connected to the pivoting system, and configured to operate the pivoting system in response to an inclination event associated with the body being tilted away from the exhaust water drainage port. By the operation of the pivoting system, the fuel cell stack is tilted relative to the body toward the exhaust water drainage port.

A vehicle includes a body, a fuel cell stack supported by the body for tilting relative thereto, a pivoting system and at least one control module. The fuel cell stack includes a fuel cell operable to generate electrical energy using fuel and exhaust water as a byproduct, and an exhaust water drainage port in fluid communication with the fuel cell. The pivoting system is mechanically connected between the body and the fuel cell stack, and operable to selectively tilt the fuel cell stack relative to the body. The at least one control module is communicatively connected to the pivoting system, and configured to operate the pivoting system in response to an inclination event associated with the body being tilted away from the exhaust water drainage port. By the operation of the pivoting system, the fuel cell stack is tilted relative to the body toward the exhaust water drainage port.