Abstract: The fuel cell system has a fuel cell unit and a catalytically active reactor unit (3) for at least partial chemical transformation of an operating medium stream (1), especially a reformer, gas purifier stage and/or a combustor, in which the catalytically active reactor unit (3) has a variable catalytically active reactor volume (4) acted on by the operating medium stream. To provide the fuel cell system with a higher efficiency and good dynamic behavior the catalytically active reactor unit is provided with at least one control device (5, 8, 11, 12, 13) for controlling and/or for changing the variable catalytically active reactor volume (4) acted on by the operating medium stream (1).

Abstract: Methods and a system of controlling and/or regulating operating sequences in a brake system of a vehicle having an electronic circuit and/or control which controls and/or regulates the operating sequences and having consumers in the control and the brake system and at least one temperature detection means arranged in thermal contact with at least part of the electronic circuit and/or part of the brake system. A temperature value representing the temperature of this part is detected, and the system determines whether the temperature value exceeds at least one threshold value, where at least one measure is initiated, to reduce the temperature or to retard or stop the increase in temperature.

Abstract: A fuel cell system which including a fuel cell, a fuel tank and a consumer unit, to improve the operation of a fuel cell, is equipped with a consumption-optimizing unit that limits or interrupts the energy supply to one or more consumers of the consumer unit depending on the fill level of the fuel tank in order to ensure at least the basic function of the fuel cell system for as long as possible.

Abstract: An electrohydraulic brake system having a muscle-force-actuatable auxiliary brake and an external-force-actuatable service brake includes operating mode switchover valves triggerable by an electronic control unit for switching from the service braking state to the auxiliary braking state. A piston/cylinder unit with a pressure medium connection between a master cylinder and a wheel brake which is interrupted by the switchover valves to simulate the pedal travel in the service braking state. The piston/cylinder receives the pressure medium displaced in the master cylinder by actuation of the brake pedal by the driver's foot. The piston/cylinder unit can be hydraulically blocked in the auxiliary braking state so that pressure medium positively displaced in the master cylinder is available to the greatest possible extent for building up pressure at the wheel brakes. The subjection of the piston/cylinder unit to pressure medium is controlled via one of the operating mode switchover valves.

Abstract: A vehicle has a fuel system operative to chemically reform a fuel gas a supply unit for supplying the fuel system with the fuel gas, and a gas reservoir provided with a storage volume for an intermediate storage of the fuel gas, the storage volume having a size that is changeable.

Abstract: A fuel cell system has a fuel cell having a cathode and an anode and formed so that a hydrous fluid flows out of at least one of the cathode and the anode of the fuel cell unit, and a conditioning unit provided for conditioning the hydrous fluid flow; and a vehicle is provided with the fuel cell system.

Abstract: A fuel cell system has at least one fuel cell unit for generating electrical energy, a unit for storing or dispensing electrical energy, an electrical consumer for consuming electrical energy, a diagnostic unit for ascertaining a functional capability of the at least one fuel cell unit during a diagnosis phase, and a control unit for determining an electrical power generated at least during the diagnosis phase by the at least one fuel cell unit.

Abstract: A fuel cell apparatus has a diaphragm located between the anode and cathode sides of a fuel cell. At least one pressure compensation element (10, 20) is provided, which limits the differential pressure acting on the diaphragm (5).

Abstract: An electrohydraulic brake system as well as a method and a device for controlling the electrohydraulic brake system, in which a hydraulic fluid can be injected from an accumulator into corresponding wheel brake cylinders by valve means, where the hydraulic fluid can be delivered to the accumulator by a pump, whereby means are provided for measuring the temperature of the electrohydraulic brake system, in particular the temperature of the hydraulic fluid, as well as means for taking into account the measured temperature for open- and closed-loop control of the electrohydraulic brake system.

Abstract: The invention describes an apparatus for converting energy that can be operated with gaseous fuel, in particular a fuel cell assembly with a fuel cell (2), a fuel reservoir, and consumers (6), adjusters, sensors, and a monitoring unit. The object of the invention is to monitor the operation of the apparatus from the standpoint of safety. A monitoring unit (3) is provided for ascertaining consumption by the fuel cell (2) and/or for monitoring components required for its operation.

Abstract: A fuel cell device has a fuel cell unit, at least one adjusting element for influencing at least one fuel stream of the fuel cell unit, a control unit for controlling and/regulating of at least one adjusting element, the control unit being formed so that at least in one operational mode it provides a periodic filling and emptying of the fuel cell unit.

Abstract: A vehicle includes a combustion arrangement formed as a motor selected from the group consisting of a gasoline motor and a diesel motor, a waste gas device associated with same combustion arrangement for withdrawal of a waste gas stream, the waste gas device having at least one precipitating unit for precipitation of water from the waste gas stream.

Abstract: A method and a device for controlling at least one valve, in response to a detected leak in the system including the valve. An activation signal is generated which opens the valve briefly for flushing purposes and closes it again, or moves the valve ball at great speed onto the valve seat.

Abstract: An apparatus for controlling a fuel cell device for energy supply in a finished end product has a control unit for an operation of the fuel cell device, the control unit being formed so as to control control operational points in predetermined phases during the operation and to obtain an adjustable value of at least one device variable of the fuel cell device and to evaluate it with respect to at least one previously determined value of the device variable of the fuel cell device.

Abstract: A fuel cell device has a fuel cell unit including at least two fuel cell elements which are coupled with one another in a way selected from the group consisting of a series coupling, a parallel coupling, and both, for conversion of chemical energy into an electrical energy, and an electronic control unit for controlling individual fuel cell elements of the fuel cell unit.

Abstract: A fuel cell apparatus has a fuel cell unit, a first electronic control unit for producing an electrical control signal, at least one starting device for starting the first electronic control unit and formed as a second electronic control unit for producing an electrical input signal of the first electronic control unit and at least one further electrical signal as a starting signal of the second electronic control unit, the second electronic control unit having an electronic evaluating unit formed so that the two independent electrical starting signals are automatically connected with one another with the electronic evaluating unit of the second electronic control unit.

Abstract: The fuel cell system has a fuel cell unit and a catalytically active reactor unit (3) for at least partial chemical transformation of an operating medium stream (1), especially a reformer, gas purifier stage and/or a combustor, in which the catalytically active reactor unit (3) has a variable catalytically active reactor volume (4) acted on by the operating medium stream. To provide the fuel cell system with a higher efficiency and good dynamic behavior the catalytically active reactor unit is provided with at least one control device (5, 8, 11, 12, 13) for controlling and/or for changing the variable catalytically active reactor volume (4) acted on by the operating medium stream (1).

Abstract: A method and a device for controlling at least one valve, in response to a detected leak in the system including the valve. An activation signal is generated which opens the valve briefly for flushing purposes and closes it again, or moves the valve ball at great speed onto the valve seat.

Abstract: In a method and a device for controlling a brake system, the wheel brake pressure is set at the wheel brakes electrically as a function of the driver's braking input. The high-pressure supply arrangement for pressure buildup, for which at least one pump and one accumulator are provided, is monitored by comparing the change in accumulator pressure to a least one permissible limiting value. In the case of a fault in the pressure supply, it is made possible for the driver to grip through hydraulically to the wheel brakes.

Abstract: A method and a device for controlling a brake system, where a braking intention value, which is used for controlling the brake system, is determined from at least one brake pedal actuation parameter. When the braking intention value is determined from the actuation parameter, its direction of change is taken into account.