Abstract: A pump has a shaft, an impeller arranged on the shaft, and a labyrinth seal which is arranged between stationary and moving parts of the pump. A plurality of blades are arranged on the rotor and a labyrinth seal extends at least between the shaft and a rear portion of the blades. A gap in the labyrinth seal is designed such that liquid water can be actively carried away, with the labyrinth seal for this purpose being designed at least in places with a channel in the form of a spiral and/or a staircase. The invention also relates to a fuel cell system having such a pump.

Abstract: A fuel cell system includes at least one fuel cell, line elements for supplying and discharging starting materials and/or products to/from the fuel cell, and at least one condensation unit. The condensation unit is situated in at least one of the line elements and, at least in individual operating phases of the fuel cell, the condensation unit is at a lower temperature level than the areas surrounding it and the fuel cell.

Abstract: An apparatus for supplying a fuel cell in a fuel cell system with fuel gas is provided. The fuel cell system includes a mixing region, where unused fuel gas mixes with fresh fuel gas, a water precipitator, a device for the at least indirect heating of the supplied fresh fuel gas and at least one receptor for a sensor for sensing state variables and/or chemical magnitudes of the fuel gas flowing to the anode. The mixing region, water precipitator, device for the at least indirect heating and at least one sensor are combined in an integrated component part.

Abstract: A pump has a shaft, an impeller arranged on the shaft, and a labyrinth seal which is arranged between stationary and moving parts of the pump. A plurality of blades are arranged on the rotor and a labyrinth seal extends at least between the shaft and a rear portion of the blades. A gap in the labyrinth seal is designed such that liquid water can be actively carried away, with the labyrinth seal for this purpose being designed at least in places with a channel in the form of a spiral and/or a staircase. The invention also relates to a fuel cell system having such a pump.

Abstract: A device which ensure functionality of a vehicle fuel cell system, even at temperatures of below freezing point, includes at least one heating element arranged in the area of the condensate trap of the fuel cell in such a way that any ice present is heated locally. As a result, one or more melted channels form, through which water may flow after only a very short thawing process.

Abstract: The invention is based on a method for detecting slip in the driving of generator or starter-generator systems. The alternators of these systems are equipped with electronic control components such as pulse-width-modulated inverters or rectifier bridges. The drive torque of the alternator is transferred to this by means of a belt drive of an internal combustion engine. When slip is detected in a comparison step (3), to which speed-dependent input variables (1, 2) are forwarded, the maximum transferrable drive torque is determined in a torque limiting step (18, 20), and a closed-loop control (23) adjusts the generator output power to said maximum transferrable drive torque.

Abstract: A method is provided for starting an internal combustion engine which includes a starter, an ignition, pressure store and injection valves for injecting fuel directly into the engine. An electrical high pressure pump is connected to an electrical fuel pump downstream thereof for pumping the fuel into the pressure store. The electrical fuel pump and the electrical high pressure pump are first switched on together with the ignition in order to generate a pressure in the pressure store adequate for the injection of the fuel. Then, the starter is switched on after a time duration after the electric fuel pump and the electrical high pressure fuel pump are switched on.

Abstract: A method for determining the load angle of a three-phase current synchronous machine with the aid of position information of an internal combustion engine. The latter is furnished with an engine control device, in which operating parameters and the position information of components of the internal combustion engine are stored. The following method steps are run through: First of all, the rotational position of the internal combustion engine is recorded in the engine control device when the internal combustion engine is switched off. Before the start of the internal combustion engine, the transmission of the rotational position information of the internal combustion engine to the electrical three-phase current machine takes place for the adjustment between the rotational position information and the load angle of the electrical three-phase current machine, at a rotational speed of the internal combustion engine of n=0.

Abstract: The present invention relates to a method for determining the load angle of a three-phase current synchronous machine (10) with the aid of position information (2) of an internal combustion engine. The latter is furnished with an engine control device (7), in which operating parameters and the position information of components of the internal combustion engine are stored.

Abstract: The invention is based on a method for detecting slip in the driving of generator or starter-generator systems. The alternators of these systems are equipped with electronic control components such as pulse-width-modulated inverters or rectifier bridges. The drive torque of the alternator is transferred to this by means of a belt drive of an internal combustion engine. When slip is detected in a comparison step (3), to which speed-dependent input variables (1, 2) are forwarded, the maximum transferrable drive torque is determined in a torque limiting step (18, 20), and a closed-loop control (23) adjusts the generator output power to said maximum transferrable drive torque.

Abstract: A fuel supply system (1) for an internal combustion engine, especially of a motor vehicle, is described which is provided with an accumulator (2) and a pump (6, 10). Fuel can be supplied to the accumulator (2) with the pump (6, 10). A control apparatus (16) is provided for controlling (open loop and/or closed loop) the pressure in the accumulator (2) by a pressure control valve (4). With the control apparatus (16), the pressure control valve (4) can be closed when the engine is intended to be started but no rotational movement is yet present.

Abstract: A method and device for driving at least one electromagnetic load, in particular a solenoid valve, for controlling an injection of fuel into an internal combustion engine, using a drive circuit equipped with an electronic switching device and at least one booster capacitor. The booster capacitor includes a recharging device that recharges a voltage of the booster capacitor to a desired voltage value influencing an opening speed of the solenoid valve, and thus an injection time, each time the booster capacitor is partially or completely discharged. The recharging device is functionally connected to a detecting device for detecting at least a speed and a load of the internal combustion engine. The recharging device includes a regulating device that regulates an intensity of a recharging current needed for the desired voltage value and the necessary recharging time, at least as a function of the speed and the load detected by the detecting device.

Abstract: A fuel supply system for an internal combustion engine, in particular of a motor vehicle, is equipped with a pressure accumulator and a high-pressure pump with which fuel can be delivered to the pressure accumulator. Also provided is a control device with which at least the pressure in the pressure accumulator can be controlled. When the internal combustion engine is in coastdown (overrun) mode, the pump output of the high-pressure pump can be reduced.

Abstract: A method for simulating control functions of a control device, in which a control program code for execution of control functions is stored in a first memory area of a memory belonging to the control device, the control program code including one or more control program code modules for the control functions, and containing at least one switching device for switching over from a control program code module SPCM to a simulation program code module. At least one simulation program code module for one or more test control functions is made available in a second memory area of the memory. The switching devices switch over from the control program code module to a pertinent simulation program code module stored in the second memory area. The control program code is then processed, the simulation program code module being executed, via the switched-over switching device, instead of the control program code module.

Abstract: An internal combustion engine for a motor vehicle in particular is described, provided with an injection valve for injecting fuel directly into a combustion chamber either during an intake phase in a first operating mode or during a compression phase in a second operating mode. In addition, a control unit is also provided for controlling and/or regulating a fuel mass injected into the combustion chamber differently in the two operating modes. The control unit is designed so that a required air mass can be determined from a torque demand in the first operating mode, and then the fuel mass to be injected can be determined from the required air mass, and in the second operating mode the fuel mass injected can be determined directly from the torque demand.

Abstract: A method is provided for starting an internal combustion engine for a motor vehicle, and an internal combustion engine is provided which employs such method. The internal combustion engine includes a piston which can move in a cylinder and can execute an intake stroke, a compression stroke, a power stroke and an exhaust stroke. In addition, a control unit is provided with which fuel can be injected directly into a combustion chamber, which is delimited by the cylinder and the piston either during a compression stroke in a first operating mode or during an intake stroke in a second operating mode. The control unit is designed so that for starting, fuel can be injected in a first injection directly into the combustion chamber whose respective piston is in the power stroke.

Abstract: A control device for a direct-injection gasoline engine with sensors for operating parameters, a signal processing unit, as well as metering and actuating devices for at least fuel mass, fuel pressure, air mass, and ignition.

Abstract: A method and a device for controlling an internal combustion engine, in particular a diesel gasoline engine. The output signal from at least one structure-borne noise sensor is supplied to at least one first and one second filter means, which exhibit different response characteristics. On the basis of the output signals from the filmer means, at least two quantities that characterize the combustion and/or the injection in the internal combustion engine are able to be determined.