An operation control system and method of a fuel cell vehicle are provided. The system includes a fuel cell, an air supply device operated by a motor, to supply air to the fuel cell and a sensing unit that senses an abnormal operation of the air supply device. A calculation unit calculates a lower-limit voltage of the air supply device required for normal operation of the air supply device when the sensing unit senses abnormal operation of the air supply device. A controller then adjusts a voltage supplied to the air supply device based on the calculated lower-limit voltage.

An operation control system and method of a fuel cell vehicle are provided. The system includes a fuel cell, an air supply device operated by a motor, to supply air to the fuel cell and a sensing unit that senses an abnormal operation of the air supply device. A calculation unit calculates a lower-limit voltage of the air supply device required for normal operation of the air supply device when the sensing unit senses abnormal operation of the air supply device. A controller then adjusts a voltage supplied to the air supply device based on the calculated lower-limit voltage.

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.

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 present invention provides a fuel cell stack protection method, a fuel cell stack protection device and a fuel cell power supply system. The method comprises: determining whether a load-dump failure occurs to the fuel cell; controlling the bleeder circuit connected to the output ends of a DC-DC circuit in the fuel cell so as to discharge the DC-DC circuit when a load-dump failure occurs to the fuel cell. When a load-dump failure occurs to the fuel cell, the bleeder circuit connected to the output ends of the DC-DC circuit in the fuel cell is turned on to discharge the DC-DC circuit so that the DC-DC circuit in the fuel cell can continue to output a current, thus preventing the voltage of a fuel cell stack from rising abruptly because of a load-dump failure and preventing any damage caused by a load-dump failure to the fuel cell stack

The present invention provides a fuel cell stack protection method, a fuel cell stack protection device and a fuel cell power supply system. The method comprises: determining whether a load-dump failure occurs to the fuel cell; controlling the bleeder circuit connected to the output ends of a DC-DC circuit in the fuel cell so as to discharge the DC-DC circuit when a load-dump failure occurs to the fuel cell. When a load-dump failure occurs to the fuel cell, the bleeder circuit connected to the output ends of the DC-DC circuit in the fuel cell is turned on to discharge the DC-DC circuit so that the DC-DC circuit in the fuel cell can continue to output a current, thus preventing the voltage of a fuel cell stack from rising abruptly because of a load-dump failure and preventing any damage caused by a load-dump failure to the fuel cell stack

A vehicle includes a fuel cell having an air inlet port and an air outlet port and an air supply system having a compressor connected in fluid communication with the inlet port and a throttle valve connected in fluid communication with the outlet port. A controller is programmed to change a position of the throttle valve based on a target mass air flow, a measured mass air flow, a measured pressure, and the position of the throttle valve.

An airship and its long-term floating capacity maintenance method are disclosed. The airship includes an airship capsule and a pod at bottom. A renewable fuel cell and a water tank communicated with each other are arranged in the pod. The water tank is provided with a water inlet connected with a filling aircraft outside the airship. The airship capsule is provided with a solar cell. The interior of the airship capsule is provided with a hydrogen storage bag. The solar cell is electrically connected with the renewable fuel cell. The renewable fuel cell can use electric energy provided by the solar cell to electrolyze water provided by the filling aircraft into hydrogen and supplement the hydrogen to the hydrogen storage bag. The airship can supplement hydrogen to the airship capsule by electrolyzing water to reduce the phenomenon of insufficient gas in the airship capsule.

An airship and its long-term floating capacity maintenance method are disclosed. The airship includes an airship capsule and a pod at bottom. A renewable fuel cell and a water tank communicated with each other are arranged in the pod. The water tank is provided with a water inlet connected with a filling aircraft outside the airship. The airship capsule is provided with a solar cell. The interior of the airship capsule is provided with a hydrogen storage bag. The solar cell is electrically connected with the renewable fuel cell. The renewable fuel cell can use electric energy provided by the solar cell to electrolyze water provided by the filling aircraft into hydrogen and supplement the hydrogen to the hydrogen storage bag. The airship can supplement hydrogen to the airship capsule by electrolyzing water to reduce the phenomenon of insufficient gas in the airship capsule.

A method of operating an aircraft includes providing a fuel cell system to power the aircraft, providing an airflow path through the fuel cell system, sensing a change mass air flow rate supplied to a compressor of the fuel cell system, and at least one of adjusting a restriction of airflow entering the airflow path in response to the sensed change in mass air flow rate, adjusting a restriction of airflow exiting the airflow path in response to the sensed change in mass air flow rate, and adjusting an air scoop to gather a different amount of air into the airflow path. A method of operating an aircraft includes sensing a change in ambient pressure supplied to an airflow path and adjusting a restriction of airflow exiting the airflow path in response to a sensed change in ambient pressure.