摘要:
A fuel cell vehicle comprises a motor, a fuel cell, a first DC/DC converter, and a first converter control unit. The first DC/DC converter performs a boosting operation when the fuel cell vehicle runs in a non-stationary state, and does not perform the boosting operation during the vehicle runs in a stationary state.
摘要:
Provided is a fuel cell system capable of making a shift of an operation state while optically controlling an output voltage and an output voltage of a fuel cell. When an ECU judges that the time when an operation should be shifted from a low-efficiency operation to a normal operation has come, the ECU performs, as preprocessing prior to a shift to a ΔV control, processing of increasing an oxidant gas supplied to a fuel cell stack by a predetermined amount. After this processing, the ECU detects output power, calculates an output power deviation, and then compares the output power deviation with a set deviation threshold. When the output power deviation exceeds the deviation threshold, the ECU carries out the ΔV control, and then carries out an I-V control. Meanwhile, when the output power deviation does not exceed the deviation threshold, the ECU judges that the time when the ΔV control is carried out has not come yet, and automatically starts the I-V control without carrying out the ΔV control.
摘要:
Power unit for an electronic device and process for control and regulation of an electronic device powered by a fuel cell. Power unit includes a fuel cell having a low output voltage between 0.3 and 1V, and a conversion device coupled to the fuel cell to convert an input voltage as low as 0.3 V to a higher output voltage to operate the electronic device.
摘要:
Fuel cell systems and methods for controlling fuel cell systems. In one embodiment, the method includes supplying power produced by operating the fuel cell stack in a maximum output mode to the load while concurrently charging the secondary cell with the produced power when an amount of charge of the secondary cell is smaller than a first standard value, supplying both power produced by operating the fuel cell stack in a stable output mode and the power discharged by the secondary cell to the load when the amount of charge of the secondary cell is larger than a second standard value, and maintaining an existing output mode among the output modes when the amount of charge of the secondary cell is larger than the first standard value and smaller than the second standard value.
摘要:
A fuel cell voltage stabilization apparatus is disclosed. The apparatus utilizes electronic circuits for voltage modulation to stabilize and fix the voltage load for a fuel cell. The apparatus comprises a voltage boost circuit and a voltage reducing circuit, which are realized by electronic circuits to stabilize an output voltage of the fuel cell and fix the output voltage to the loading.
摘要:
In a method for operating a fuel cell including an electrolyte membrane sandwiched by a fuel electrode and an oxidizing agent electrode, the method includes a hydrogen feedback process either before starting operation of the fuel cell or after stopping operation of the fuel cell. The hydrogen feedback process includes the processes of a process for electrically connecting a positive electrode of an external electric power source to the oxidizing agent electrode of the fuel cell, a process for electrically connecting a negative electrode of the external electric power source to the fuel electrode of the fuel cell, a process for oxidizing hydrogen remaining in the oxidizing agent electrode to generate protons, the hydrogen contained in the fuel, and a process for reducing the protons, transferred to the fuel electrode from the oxidizing agent electrode through the electrolyte membrane, into hydrogen.
摘要:
A liquid fuel cell unit which outputs a first voltage, a boosting circuit which boosts the first voltage output from the liquid fuel cell unit, and outputs a boosted second voltage to an electronic apparatus, and a first control circuit are included. The first control circuit compares the first voltage output from the liquid fuel cell unit with a preset first threshold voltage, and controls the boosting circuit in accordance with the comparison result such that the first voltage does not fall below the first threshold voltage, or the first voltage holds the first threshold voltage or more.
摘要:
A fuel cell system includes a fuel cell stack, an air supply system including a blower for driving the air to the fuel cell stack and an air humidifier for humidifying the air supplied to the fuel cell stack, a hydrogen supply system including a hydrogen storage and a pressure regulating device, and a hydrogen recirculator for receiving excessive hydrogen from the fuel cell stack and forcing the hydrogen back into the fuel cell stack in order to induce a hydrogen flow inside the fuel cell stack. A control circuit electrically controls the flow and pressure regulating device for regulating the hydrogen flow to the fuel cell stack and electrically controls the blower to regulate the air flows to the fuel cell stack and the air humidifier.
摘要:
A power distribution control system for a hybrid fuel cell vehicle is provided. The system includes a high energy converter (HEC) for providing current from an electrical bus to the battery, or from the battery to the bus. As a vehicle load changes, the HEC adjusts the battery current flow. A current command is sent to a fuel cell controller so that the fuel cell current output is adjusted. As the fuel cell current output changes, the HEC further adjusts the battery current flow, until there is a zero net current flow to and from the battery. At this point, a state of equilibrium is reached and the fuel cell provides all the current required by the vehicle loads.
摘要:
A fuel cell system determines each of a battery charging current error, a battery voltage error, and a stack current error. The fuel cell system regulates current through a series pass element in response to a greater of the determined errors. Thus, the fuel cell system operates in three modes: battery voltage limiting mode, stack current limiting mode and battery charging current limiting mode. Additionally, there can be a fourth nullsaturationnull mode where the stack voltage VS drops below the battery voltage VB as the load pulls even more current. Individual fuel cell systems can be combined in series and/or parallel to produce a combined fuel cell system having a desired output voltage and current.