Abstract: A computer implemented method controls an electric power system of a fuel cell electric vehicle (FCEV). The electric power system has a fuel cell and an energy storage system electrically connected to each other. An upcoming position at which the electric power system will assume a low load operation mode is determined, and the electric power system is controlled based on a power distribution scheme to arrive at the upcoming position with a state of charge level of the energy storage system below a predetermined threshold level, whereafter the electric power system is controlled to feed electric power at least to the energy consumer when the electric power system assumes the low load operation mode at the upcoming position.

Abstract: A method for controls a cooling system of a power assembly having a fuel cell unit and an electric energy storage system. The cooling system is controllable to cool the fuel cell unit to a first temperature at which the fuel cell unit can generate power at a first power level, and at which the electric energy storage system delivers output power when the power request is above the first power level. The method comprises predicting a power request for power delivery from the power assembly during a future time interval, determining an electric energy level of the electric energy storage system, determining if the power assembly will be unable to deliver output power according to the power request throughout the time interval, controlling the cooling system to cool the fuel cell unit to a second temperature higher than the first temperature.

Abstract: A method and control system for a fuel cell system for a fuel cell vehicle is described. The fuel cell system has at least one fuel cell stack, and a cooling system. Processing circuitry of the control system may, for each fuel cell system power output in a plurality of fuel cell system power outputs, determine a cooling electrical power value indicative of cooling electrical power required to be supplied by the fuel cell system to the cooling system for rejecting output heat generated at least by the fuel cell system, determine a net electric power output value indicative of net electric power output that can be supplied from the fuel cell system to one or more electric power consumers when operating to produce the fuel cell system power output, and using the net electric power output value for determining a fuel cell system output level threshold for the fuel cell system.

Abstract: A fuel cell arrangement for a fuel cell vehicle has a cathode inlet conditioning assembly configured to receive ambient air and to output cooled compressed air, a fuel cell assembly and an energy dissipating resistor arranged downstream the cathode inlet conditioning assembly, an air bleed valve arranged upstream the fuel cell assembly and resistor, a one-directional valve arranged downstream the air bleed valve and upstream the resistor, a throttle valve arranged downstream the air bleed valve and upstream the fuel cell assembly, and a control unit being configured to control the air bleed valve, the throttle valve, and the one-directional valve to maintain an operating pressure of the fuel cell assembly while dissipating energy via the resistor, when the control unit identifies an upcoming brake event.

Abstract: A vehicle fuel cell system has an energy dissipating resistor arranged in connection with a control unit. The control unit is configured to detect an upcoming brake event by the vehicle within a time period. The control unit is configured to predict a temperature of the resistor at an onset of the upcoming brake event. The control unit is configured to actively cool the resistor, in preparation for the upcoming brake event, if the predicted temperature of the resistor at the onset of the upcoming brake event fails to satisfy a temperature acceptance criterion.

Abstract: A method for determining aging of a fuel cell system for a vehicle, comprising identifying a future interval in terms of time or distance during which the fuel cell system is expected to operate at stationary operating conditions, obtaining measurement values pertaining to at least one fuel cell parameter indicative of degradation of the fuel cell system during the identified interval, and determining an aging state of the fuel cell system using the measurement values.

Abstract: A method and a computer system for controlling a fuel cell system, such as of a vehicle, is described. The computer system comprises comprising processing circuitry to predict an event, such as a downhill road section, during which a power ramp down of the fuel cell system is expected, control the fuel cell system to recuperate water from at least one fuel cell exhaust line and collect the recuperated water in a water reservoir in dependence on the predicted event, control a water injector to inject water from the water reservoir into a cathode inlet line of the fuel cell system in connection with the power ramp down during the predicted event.

Abstract: A system and method controls transition of a fuel cell vehicle from a normal operating mode to a hot operating mode when a power demand from a fuel cell system of the fuel cell vehicle increases. The method includes determining a required value of a traction power from the fuel cell system for the fuel cell vehicle; determining a net electric power output value of the fuel cell system based on a fuel cell system power output and a cooling electrical power value; and controlling the fuel cell vehicle to transition from the normal operating mode to the hot operating mode by increasing the net electrical power output from a first fuel cell system output level threshold level to a second fuel cell system output level threshold level beyond which an increase in the fuel cell power output results in a decrease in the net electric power output value.

Abstract: A system and method of controlling operation of a fuel cell vehicle comprising a fuel cell system having a fuel cell stack is described. The method comprises obtaining route data of a route for the vehicle that comprises at least one section of the route wherein switching from a hot operating mode to a normal operating mode can be performed; when a state of health (SoH) of the fuel cell stack is within a target SoH and the vehicle assumes the hot operating mode, controlling the vehicle to either assume the normal operating mode or remain operating in the hot operating mode during the section of the route, based on an expected degradation of the fuel cell stack due to switching between the hot and normal operating modes and an expected degradation of the fuel cell stack due to the vehicle remaining operating in the hot operating mode when passing the section of the route.

Abstract: A system and method for controlling transition of a fuel cell vehicle from a normal operating mode to a hot operating mode having a fuel saving operating mode is described. The method comprises determining a required value of a traction power from the fuel cell system for the fuel cell vehicle; determining a net electric power output value of the fuel cell system based on a fuel cell system power output and a cooling electrical power value; and controlling the fuel cell vehicle to transition from the normal operating mode to the hot operating mode via a first transition mode or via a second transition mode so that the net electric power output value is equal to the required value of the traction power and a coolant inlet temperature at a coolant inlet of a fuel cell stack of a fuel cell system of the fuel cell vehicle is equal to a hot coolant temperature.

Abstract: A computer system and a method for controlling a power system of a vehicle is disclosed. The power system includes a fuel cell system and an energy storage system comprising one or more batteries. The method includes predicting an upcoming driving event associated with a start time and a time duration, the driving event being an event during which the vehicle is expected to be operated under a load condition. The method further includes determining a preferred operating condition of the fuel cell system during the predicted upcoming driving event based on the load condition and on the time duration, and controlling the power system by performing a preparation action associated with the power system in dependence of the determined operating condition of the fuel system before the start time of the predicted upcoming driving event.

Abstract: A computer system has processing circuitry to acquire terrain data of an upcoming power event for a host vehicle, calculate a total power required for traveling through the upcoming power event provided a target speed for the host vehicle, calculate, by adjusting a speed parameter for the host vehicle at the upcoming power event, a pulse power and pulse time available in the electrical energy storage system of the host vehicle to assist a speed adjusting device of the host vehicle during the upcoming power event to reach the total power, calculate a recovery time window prior to the upcoming power event that allows the electrical energy storage system to provide the pulse power and pulse time at the upcoming power event with the constraint that a thermal limit of the electrical energy storage system at the end of the upcoming power event is not exceeded, provide an output including the recovery time window, the pulse power, and the pulse time.

Abstract: A computer implemented method controls an electric power system of a fuel cell electric vehicle (FCEV). The electric power system has an energy storage system and a fuel cell. The fuel cell is controlled to assume a power mode when arriving at a starting position of an upcoming road path when an electric energy consumption of the electric power system exceeds an electric energy capacity of the electric power system.

Abstract: A computer implemented method controls an electric power system of a fuel cell electric vehicle (FCEV). The electric power system has a fuel cell and an energy storage system electrically connected to each other. An upcoming position at which the electric power system will assume a low load operation mode is determined, and the electric power system is controlled based on a power distribution scheme to arrive at the upcoming position with a state of charge level of the energy storage system below a predetermined threshold level, whereafter the electric power system is controlled to feed electric power at least to the energy consumer when the electric power system assumes the low load operation mode at the upcoming position.

Abstract: A fuel cell system has a fuel cell unit that includes a fuel cell stack comprising a cathode and an anode, a cathode recirculation passage configured to divert a cathode exhaust flow to a cathode inlet line when reduction in oxygen partial pressure in an air flow fed to the cathode via the cathode inlet line is required, and an inert gas generating system configured to generate an inert gas to be supplied to the cathode inlet line when further reduction in oxygen partial pressure in the air flow is required. When the fuel cell system is or is expected to be operating with a reduced power demand, a value of a power output that is requested from the fuel cell system is compared to at least one threshold power level to determine whether to divert the cathode exhaust flow and/or the inert gas to the cathode inlet line.

Abstract: A fuel cell system for a vehicle, has a fuel cell unit that includes a fuel cell stack and a coolant system. A control system is configured to preemptively determine that a fuel cell system power ramp-down event will occur when a decrease in power of the fuel cell system would be required as the vehicle is approaching a portion of a route associated with a low power demand from the fuel cell system. The fuel cell system is controlled by reducing a target inlet coolant temperature, and by applying a first response strategy that involves continuously reducing a flow rate of the coolant flow, and/or a second response strategy that may involve continuously and gradually increasing the flow rate of the coolant flow and then, in some situations, continuously and gradually decreasing the flow rate of the coolant flow.

Abstract: A system and method controls operation of a fuel cell system comprising a fuel cell unit that comprises a fuel cell stack comprising a cathode and an anode, and a cathode recirculation passage configured to divert a cathode exhaust flow to a cathode inlet line. A control system is configured to, responsive to a value of a power output that is requested from the fuel cell system being below a first threshold power level, control a target coolant inlet temperature of a coolant at a coolant inlet of the fuel cell stack and control an air pressure at the cathode. Responsive to the value of a power output being below at least one second threshold power level, additionally, an oxygen partial pressure in the air flow may be reduced by controlling a volume flow rate of a cathode exhaust flow that is directed to the cathode inlet line.

Abstract: A cooling system in a fuel cell electric vehicle comprising a first chamber configured to contain relatively hot fluid and a second chamber configured to contain relatively cold fluid. The ratio of cooling power/fan power of a positive displacement device at a heat exchanger is monitored and thermal energy transfer between coolant and the chambers is controlled based on the ratio. When the ratio is above a pre-defined value or value range, thermal energy from the first chamber is provided to the coolant in the coolant circuit and passed into the heat exchanger, after which part of the thermal energy of cooled coolant leaving the heat exchanger is provided to and stored in the second chamber. The stored cold thermal energy is released from the second chamber when the ratio is below the pre-defined value or value range. The invention also relates to a method of controlling a cooling system.

Abstract: A method for operating a fuel cell system below a predetermined maximum polarisation cell voltage limit wherein, for each set of one or more operational conditions of the fuel cell, said limit corresponds to a minimum power limit, and wherein said set includes at least the temperature of the fuel cell, said method including: receiving a power request for execution at an execution time, in response to detecting that the power request is lower than an estimated minimum power limit corresponding to an estimated set of operational conditions at said execution time, including an estimated temperature, performing an adjustment of least one out of said operational conditions to achieve an adjusted set of operational conditions at which the minimum power limit is lower than said estimated minimum power limit; wherein said adjustment includes cooling said fuel cell to a reduced temperature being lower than said estimated temperature.

Abstract: A system and method for controlling operation of a fuel cell system of a fuel cell vehicle, to reduce an amount of heat generated by one or more heat sources in the fuel cell system, are provided. The method comprises obtaining a value of power output of the fuel cell system, the value indicating a power demand from the fuel cell system during operation of the vehicle; and adjusting a value of a target coolant inlet temperature of a coolant at a coolant inlet of the fuel cell stack to vary between a first target temperature level and a second target temperature level, in dependence on the value of the power output, to optimize a duration of time during which the target temperature is different from the first target temperature level and to optimize a value of one or more parameters related to operation of the fuel cell system.