Abstract: A method is disclosed for monitoring galvanic isolation of a fuel cell device. At least one stack of fuel cells and at least one load circuit for fuel cells are arranged to an electrically freely floating configuration towards at least one structure near fuel cells. A controlled switching is performed via at least two switching points to at least one measurement element having known impedance in connection to the at least one structure. Measurements are performed from the measurement element to form voltage information. The voltage information and at least voltage information between switching points are processed to check floatages of fuel cells in relation to said at least one structure.

Abstract: Arrangement for providing cooling energy to a cooling medium circuit of a marine vessel having a storage of liquefied gas, the arrangement having a gas feeding system being provided with gas evaporation/heating apparatus. The gas evaporation/heating apparatus is arranged in heat transfer connection with the cooling medium circuit of the vessel through an intermediate flow circuit.

Abstract: An arrangement for controlling the fuel supply in a fuel supply apparatus, which arrangement comprises a body part including a space, through which the fuel to be injected flows during the operation, and a fuel inlet opening and a fuel discharge opening, which open into said space, the arrangement further comprising a piston member movably arranged in said space and a flow path to provide flow communication between the fuel inlet opening and the fuel discharge opening. The arrangement comprises at least one throttle section opening to the front of the piston member in the flow direction of the fuel, the cross-sectional flow area of which section is determined by the mutual positions of the piston member and the body part.

Abstract: A method is disclosed for producing electrical current by a fuel cell device, which inputs electrical current to an electrical network. A fuel cell device can be arranged to be parallel connected to the electrical network. A phase reference signal can be utilized in the inputting of the electrical current, and electrical current inputted to electrical network can be current controlled by a power transformer having a power stage. The fuel cell device can be switched off from the electrical network when a malfunction occurs in the electrical network. The fuel cell device can be changed, using the phase reference signal, to the switched off operation mode for performing voltage controlled operation of the power transformer. A controllable load can be used for maintaining a power stability between the voltage controlled power transformer and other parts of the fuel cell device.

Abstract: The invention relates to a marine vessel (1) comprising a hull (2) and a propulsion arrangement including an internal combustion engine (3), an exhaust gas arrangement (4), and a propulsion unit (5). The marine vessel (1) further is provided with at least one vertically arranged cylinder (6) with a vertical axis, which vertically arranged cylinder (6) is adapted to rotate around its vertical axis. To avoid any substantial increase of windage area, the vertically arranged cylinder (6) is arranged around a part of the exhaust gas arrangement (4) of the marine vessel (1).

Abstract: A fuel injection arrangement for a piston engine, the arrangement comprising an injector nozzle (1) for injecting fuel into the combustion chamber (6) of the cylinder. A Theological actuator (15) is arranged in connection with the injector nozzle (1), the actuator comprising a space (18) containing Theological fluid and an apparatus (19, 20) by means of which the viscosity of the Theological fluid can be changed for controlling the fuel injection.

Abstract: The disclosure relates to a fuel cell device arrangement for producing electrical energy, having at least one fuel cell anode and cathode, an electrolyte for conveying ions between the anode and the cathode, and a passage separate from the electrolyte for the electrons travelling from the anode to the cathode. A control arrangement can prevent the formation of carbon by calculating a thermodynamic equilibrium model based on thermodynamic equilibriums of chemical reactions for the feedback recirculation of fuel. Measurement values are obtained, at least from the electric current and the fuel flow rate, for calculating the fuel composition. Conversion values set on the basis of the thermodynamic equilibrium model for the fuel are calculated using the measurement values and fuel composition.

Abstract: The invention relates to supplying pilot fuel to the cylinders of a combustion engine. The invention comprises cylinder-specific pressure sensors (1) that are installed in the cylinders of the combustion engine, as well as a control unit (2). The control unit determines each cylinder's crankshaft angle at maximum pressure and the cylinders' average crankshaft angle at maximum pressure, and verifies whether the average crankshaft angle at maximum pressure is within a certain range of crankshaft angle variation. If the average crankshaft angle at maximum pressure is outside the range of variation, the duration of total pilot fuel injection into the engine is controlled. Furthermore, the differences between each cylinder's crankshaft angle at maximum pressure and the average crankshaft angle at maximum pressure are determined.

Abstract: The invention relates to balancing the cylinders of an internal combustion engine. The invention comprises cylinder-specific pressure sensors (1) installed in the cylinders of an internal combustion engine for measuring the cylinder pressures as well as an adjustment unit (2). The adjustment unit is arranged to determine the maximum pressure and knock value of each cylinder as well as the mean maximum pressure of the cylinders as a response to the measurements of cylinder pressures and to determine the differences between the maximum pressure of each cylinder and the mean maximum pressure. The differences are compared to a certain deviation range of the mean maximum pressure and the knock value to a certain knock limit value.

Abstract: The invention relates to fuel system for gas driven piston engine in a marine vessel, which gas is stored in at least one fuel storage tank in the vessel as liquefied gas. The fuel feeding system comprises a separate fuel feed tank in which the gas is in liquid phase and at elevated pressure. The gas is also in liquid phase in the fuel storage tank, in which, however, prevails only the hydrostatic pressure caused by the liquid gas.

Abstract: Invention relates to method of operating turbocharged piston engine including the steps of running the engine during a period, shutting down the engine, and restarting the engine. After a first time interval from shutting down the engine, and while a turbine and compressor parts of the turbocharger are rotating, a cleaning agent is introduced into the stream of gas flowing in a flow channel upstream the turbine part during a second time interval prior to restarting the engine.

Abstract: The disclosure relates to a system and a method for enhancing the preheating of a fuel cell system having at least one fuel cell unit whose fuel cells are provided with an anode side, a cathode side and an electrolyte provided therebetween, as well as a connecting plate set between each of the fuel cells. In operation, safety gas flowing on the anode side is heated, at least for the most part (e.g., greater than 50%), in the fuel cell unit by thermal energy contained in a gas flowing on the cathode side.

Abstract: A method and system are disclosed for reducing the consumption of safety gas in a fuel cell system having at least one fuel cell unit whose fuel cells include an anode side and a cathode side, as well as an electrolyte interposed therebetween. A supply is provided for supplying the anode with a safety gas, and an exhaust is provided for exhausting the fuel cell unit of a spent safety gas coming from the anode side. The method can adapt a specific percentage of the spent safety gas flow coming from the anode side of the fuel cells to be re-supplied into the anode side of the fuel cells.

Abstract: The present invention relates to a preheating arrangement in a fuel cell apparatus, the fuel cell apparatus comprising at least a fuel cell unit, the fuel cells of which include an anode side and a cathode side and an electrolyte therebetween and in which fuel cell apparatus there is at least a fuel inlet into the anode side and an oxygen-containing gas inlet into the cathode side as well as a de-sulphuring unit and a fuel modifying unit and an afterburner for combusting the exhaust gases of the anode and/or cathode sides. According to the invention, a separate fuel channel has been arranged for the afterburner for introducing fuel to the afterburner at least during the start-up phase of the fuel cell apparatus and that at least a portion of the exhaust gases formed in the combustion of the separately fed fuel is arranged to be directed during the start-up phase of the fuel cell apparatus from the afterburner for heating at least the de-sulphuring unit and/or the fuel modifying unit.

Abstract: A vibration suppressor and a vibration damper are configured in a system including an internal combustion engine and an exhaust-gas turbo charger. The vibration suppressor and vibration damper are secured to an exposed place on the system which is subjected to strong vibrations. As the vibrations are the strongest in said area, the vibration reducer can be used to a maximum. The system including the internal combustion engine and the exhaust-gas charger is enhanced in such a manner that the internal combustion engine can be operated in all of the rotational speed ranges without reducing the service life of individual components or the entire system.

Abstract: A gas engine plant that includes a combustion engine adapted to combust gaseous fuel receives fuel containing hydrocarbons, reforms the fuel by cracking the heavier hydrocarbons in the fuel while minimizing cracking of methane, and feeds the reformed fuel in gaseous form to the combustion engine.

Abstract: The present invention relates to a propulsion arrangement for a marine vessel, which propulsion arrangement comprises an internal combustion engine, a shaft arrangement and a steerable thruster unit. The marine vessel further comprises an electric generator or a combined electric generator and motor in connection with the propulsion arrangement. In order to reduce space requirements and required equipment as well as to raise efficiency, the shaft arrangement comprises a main shaft extending from the internal combustion engine to a first angle gear and a drive shaft extending from the first angle gear to a second angle gear in the steerable thruster unit. The electric generator or the combined electric generator and motor is connected to the drive shaft of the shaft arrangement after the main shaft and the first angle gear are connected thereto.