A disclosed fuel cell system includes a fuel inlet that receives a fuel gas from a fuel source, a gas analyzer that determines a composition of the fuel gas received by the fuel inlet, and a stack including fuel cells that generate electricity using the fuel gas received from the fuel source. The fuel cell system further includes a controller that controls at least one of a fuel utilization of the stack, a current generated by the stack, or a voltage generated by the stack, based on the composition of the primary fuel gas determined by the gas analyzer. The controller may control the fuel cell system by increasing or decreasing a fuel flow rate to thereby increase or decrease the voltage generated by the stack to maintain a predetermined target voltage or to maintain a predetermined rate at which usable fuel is supplied to the stack based on composition.

The present disclosure relates to systems and methods of using a proportional control valve in a fuel cell stack system. The fuel cell stack system, may comprise a fuel cell stack including an anode with an anode inlet and an anode outlet, and a cathode with a cathode inlet and a cathode outlet, and a control valve, which controls the flow of a fuel into the anode. The flow of fuel may be based on a pressure differential measured across any two of the anode inlet, the anode outlet, the cathode inlet, and the cathode outlet.

A fuel cell system includes a fuel cell, a fuel gas supply channel, a regulator, an injector, and a controller. The controller drives the regulator in conjunction with the injector. The controller compares a fuel gas flow amount necessary for the fuel cell to generate electricity with a predetermined fuel gas flow amount, selects the fuel gas flow amount that is larger, and issues commands to the regulator and the injector. The predetermined fuel gas flow amount is set to be larger than the fuel gas flow amount necessary for the fuel cell to generate the electricity when a generated current or output of the fuel cell is smaller than a predetermined threshold value.

A control method and system of a fuel cell electric vehicle stack. The control method comprises obtaining insulation resistance of the stack, comprising at least two sub-stacks connected in parallel; and disconnecting a sub-stack with insulation failure from a DC bus and then causing the stack to enter a failure mode when it is determined that the insulation resistance of the stack is smaller than a first preset threshold. The stack is determined to have an insulation failure when it is determined that the insulation resistance of the stack is smaller than the first preset threshold. The sub-stack with the insulation failure is located and disconnected the sub-stack with insulation failure from a DC bus, and the stack is then caused to run in a failure mode to perform failure protection, avoid deterioration of the insulation failure and burnout of the stack and improve the safety performance of the stack.

The invention provides an SOFC cooling system. For the feature that not all components work in the full operation process of an SOFC, a DC step-down transformer DCDC, a fan and a condenser are connected in parallel, and a solenoid valve is installed in each parallel pipeline for controlling on/off of each pipeline according to a corresponding signal. Compared with the traditional SOFC cooling system, the constant-flow serial cooling system will reduce pressure losses and the power of a water pump; a solenoid valve is installed in each parallel pipeline for controlling on/off of each branch according to a corresponding signal; considering the cooling requirements of SOFC during start-up, power generation and shutdown, all components are cooled in parallel through reasonable design of each parallel pipeline, consequently to improve the cooling effect and reduce the energy consumption; the invention also discloses a fuel cell and hybrid vehicle.

Fuel cell system with a combined fuel evaporation and cathode gas heater unit, and its method of operation A fuel cell system, in which the cathode gas heater and the evaporator are combined in a single compact first heat exchange unit which includes a first housing inside which thermal energy is transferred from the first coolant to both the cathode gas and the fuel.

The purpose of the present invention is to provide fuel cell system capable of stably executing differential pressure control and having a simplified configuration, and method for controlling the same. Fuel cell system equipped with fuel cell, a turbocharger, exhaust fuel gas line, exhaust oxidizing gas line, combustion gas supply line for supplying combustion gas discharged from a combustor to a turbine, oxidizing gas supply line for supplying oxidizing gas compressed by a compressor to cathode, a regulator valve provided to the exhaust fuel gas line, and a control unit for controlling the differential pressure between the pressure of the cathode of the fuel cell and the pressure of the anode thereof by controlling the regulator valve, wherein the exhaust oxidizing gas line is not provided with venting system for discharging exhaust oxidizing gas outside the system.

The purpose of the present invention is to provide fuel cell system capable of stably executing differential pressure control and having a simplified configuration, and method for controlling the same. Fuel cell system equipped with fuel cell, a turbocharger, exhaust fuel gas line, exhaust oxidizing gas line, combustion gas supply line for supplying combustion gas discharged from a combustor to a turbine, oxidizing gas supply line for supplying oxidizing gas compressed by a compressor to cathode, a regulator valve provided to the exhaust fuel gas line, and a control unit for controlling the differential pressure between the pressure of the cathode of the fuel cell and the pressure of the anode thereof by controlling the regulator valve, wherein the exhaust oxidizing gas line is not provided with venting system for discharging exhaust oxidizing gas outside the system.

A fuel cell cooling system may include a fuel cell stack that produces electricity by use of a fuel, a fuel cell cooler that cools cooling water for cooling the fuel cell stack through exchange of heat with external air, an exhaust line that exhausts an exhaust gas generated by the fuel cell stack, a condenser fluidically connected to the exhaust line to generate condensate by condensing the exhaust gas and store the generated condensate, an ejector connected to the condenser to eject the condensate to an external surface of the fuel cell cooler, and a condensate cooler connected to the condenser to cool the condensate stored in the condenser through exchange of heat therebetween.

The invention relates to a method for operating a fuel cell system (100), having a fuel cell stack (20) with a plurality of fuel cells (110) each having at least one cathode portion (K) and at least one anode portion (A), a compressor (10) for conveying air into the cathode portions (K), a pressure-sustaining valve (40), and a control device (50), the at least one cathode portion (K) being arranged downstream of and in fluid communication with the compressor (10) and upstream of and in fluid communication with the pressure-sustaining valve (40), the fuel cell system (100) having a high-pressure region (HDB) between the compressor (10) and the pressure-sustaining valve (40). The invention further relates to a control device (50) and to a fuel cell system (100).