Abstract:
A method for estimating a voltage of an input terminal of an inverter includes checking three-phase currents flowing from an inverter to a motor. A voltage of an input terminal of the inverter is calculated based on a plurality of design parameters, the three-phase currents, and PWM duties for determining switching operations of a plurality of switching elements of the inverter.
Abstract:
An emergency starting system and an emergency starting method of a fuel cell hybrid vehicle perform an emergency start when a DC power converter for starting fails. The emergency starting system includes: a fuel cell and a super capacitor connected through a main bus terminal in parallel; a driving inverter connected to the main bus terminal; a driving motor connected to the driving inverter; a balance-of-plant configured to activate the fuel cell; a starting DC power converter configured to drive the balance-of-plant; and a starting controller configured to control the super capacitor at the time of a start. The starting controller includes a super capacitor relay, an initial charging relay, and an initial charging resistor, the initial charging relay includes a plurality of relays, and the initial charging resistor includes a plurality of resistors.
Abstract:
A power net system of a fuel cell hybrid vehicle includes a fuel cell and an electric vehicle battery (EV battery) connected with each other through a main bus terminal in parallel, and an insulated gate bipolar mode transistor (IGBT) connected to the EV battery and the main bus terminal. The power net system further includes an inverter connected to the main bus terminal and a driving motor connected to the inverter.
Abstract:
A system and a method are provided for controlling emergency driving of a fuel cell vehicle. The system includes a cutoff relay that connects or cuts off a current flow between a chopper and a supercapacitor. A connecting relay connects or cuts off a current flow between a power line to which a fuel cell and a driving motor are connected and the supercapacitor. An emergency driving relay includes a first terminal connected to a line branched from a ground line to which the fuel cell and the driving motor are connected and a second terminal connected between a braking resistor and the chopper. A power system controller is driven in an emergency driving mode to cutoff relay to be turned off and the connecting relay to be turned on during a short circuit of the chopper and turns the emergency driving relay on or off.
Abstract:
A system and a method are provided for controlling emergency driving of a fuel cell vehicle. The system includes a cutoff relay that connects or cuts off a current flow between a chopper and a supercapacitor. A connecting relay connects or cuts off a current flow between a power line to which a fuel cell and a driving motor are connected and the supercapacitor. An emergency driving relay includes a first terminal connected to a line branched from a ground line to which the fuel cell and the driving motor are connected and a second terminal connected between a braking resistor and the chopper. A power system controller is driven in an emergency driving mode to cutoff relay to be turned off and the connecting relay to be turned on during a short circuit of the chopper and turns the emergency driving relay on or off.