Hyundai Motor Company

Kia Motors Corporation

Kia Corporation

Postech Academy-Industry Foundation

Joon Yong Lee

Soon Woo Kwon

Dong Hun Lee

Sung Do Kim

Sung Jin Chung

Chang Seok Ryu

Min Woo Kang

Sang Uk Kwon

Kyu Il Lee

Chang Seok You

Soon Il Jeon

Seo Ho Choi

Sang Hoon Lee

Tae Heon Kim

Min Su Kang

Hyeon Seok Ban

Ja Beom Koo

Ho Sung Kang

Kwang Hee Nam

In Woo Jang

Sung Yoon Jung

Soonwoo Kwon

Gwan Ho Baek

Jin Seok Hong

A system for improving fuel efficiency of a fuel cell vehicle, includes a fuel cell that provides driving energy to a vehicle, an information collection unit that collects travel route information of the vehicle including at least one of the altitude, speed limit and traffic condition of the road between the departure and the destination, and a controller that divides the travel route of the vehicle into a plurality of sections through the travel route information of the vehicle collected in the information collection unit, individually establishes the power generation strategy of the fuel cell for the plurality of sections divided, and controls the power generation of the fuel cell according to an established power generation strategy of the fuel cell when the vehicle arrives at each section, and control method thereof.

System for improving fuel efficiency of fuel cell vehicle and control method thereof

A water discharge control system and method for a fuel cell are provided. The water discharge control system includes a fuel cell stack that generates power through an internal chemical reaction, a fuel supply line that recirculates fuel discharged from the fuel cell stack and supplies the fuel to the fuel cell stack, and a water trap that is disposed in the fuel supply line to store water generated in the fuel cell stack. A drain valve is disposed in an outlet port of the water trap to block discharge of the water stored in the water trap to the outside when closed. A drain controller determines whether fuel in the fuel supply line is being discharged through the outlet port when the drain valve is in an open state and closes the drain valve upon determining that fuel is being discharged.

Water discharge control system and method for fuel cell

A fuel cell control method and are provided. The method includes collecting state data of a fuel cell stack and then estimating an effective catalytic amount of the fuel cell stack based on the collected state data. A fuel cell system is operated based on the estimated effective catalytic amount to thus optimize the efficiency of the system.

Fuel cell control method and control system

A hydrogen supply control system for a fuel cell is provided. The system includes a fuel cell stack that generates electricity using supplied hydrogen and air and a recirculation line that supplies hydrogen discharged from an outlet of the fuel cell stack back to an inlet of the fuel cell stack. A purge valve is disposed at an outlet side of the fuel cell stack of the recirculation line and discharges hydrogen in the recirculation line to the outside as the outlet is opened. A recirculation determining processor determines a recirculation state of the recirculation line and a concentration estimator estimates a purge amount for each gas, which is purged by the purge valve, based on the determined recirculation state and estimates a concentration of hydrogen in the recirculation line based on the estimated purge amount for each gas.

Hydrogen supply control system and control method for fuel cell

A system and method for controlling hydrogen purging of a fuel cell are provided. The method includes calculating a hydrogen supply amount and estimating a hydrogen consumption amount. An estimated hydrogen concentration is then corrected when a difference between the calculated hydrogen supply amount and the estimated hydrogen use amount is greater than a predetermined threshold value.

Method and system for controlling hydrogen purging of fuel cell

A method of controlling hydrogen concentration of a fuel cell includes calculating hydrogen or nitrogen concentration of gas stored in a fuel tank; estimating hydrogen or nitrogen concentration at an anode of the fuel cell based on the calculated hydrogen or nitrogen concentration of the gas; and controlling a hydrogen supply unit based on the estimated hydrogen or nitrogen concentration at the anode such that the hydrogen or nitrogen concentration at the anode follows desired hydrogen concentration or desired nitrogen concentration.

Control method and control system of hydrogen concentration for fuel cell

A method for estimating a hydrogen concentration of a fuel cell includes estimating an initial amount of gas included at an anode side of a fuel cell, calculating a crossed over amount of gas between the anode side and a cathode side of the fuel cell and an amount of gas purged from the anode side to the outside from time when an initial amount of gas is predicted to a present time, and estimating a current hydrogen concentration at the anode side based on the predicted initial amount of gas, the calculated amount of crossed over gas, and the amount of purged gas.

Method and system for estimating hydrogen concentration of fuel cell

A method of calculating a motor position uses a hall sensor. The method can include determining a motor position in response to a signal change of a hall sensor installed to a motor, calculating a basic compensation value for compensating a motor position error due to signal measurement delay of the hall sensor, determining whether a current command condition for a constant-speed operation of the motor is satisfied, calculating a first-up compensation value and a first-down compensation value, calculating an average values of the deviation between d-q axes current commands, and correcting the motor position using the basic compensation value when a difference between the average values is less than a reference average value.

Method of calculating motor position using hall sensor

A hydrogen concentration estimating method for a fuel cell includes: measuring a flow rate of air supplied to a fuel cell stack, and comparing the measured flow rate of the air with a predetermined flow rate; determining a model of an air processing system according to a comparison result; and estimating hydrogen concentration of a fuel processing system based on the determined model of the air processing system.

Hydrogen concentration estimating method and system for fuel cell

A motor control method that includes: calculating an ideal position of a motor rotor based on a Hall sensor signal; calculating a current position of the motor rotor based on a rotation speed of the motor rotor; and calculating a Hall sensor offset angle as the difference between the ideal position of the motor rotor and the current position of the motor rotor.

Motor control method

A method for controlling a fuel cell vehicle includes acquiring a state data, deriving a mathematical voltage model by substituting the acquired state data into a voltage calculation formula, measuring a voltage of a fuel cell, approximating a mathematical voltage model to a measurement voltage and deriving the reaction area data when the mathematical voltage model approximates the measurement voltage, and controlling the system of the fuel cell vehicle based on the derived reaction area data to eliminate or prevent an over-humidification situation of the fuel cell.

System and method for controlling fuel cell vehicle

A system and method for diagnosing a fuel cell stack are provided. The method includes determining, by a controller, a time at which diagnosing the fuel cell stack is required based on a plurality of factors and driving a motor adjusted to a first efficiency value for a predetermined first reference time period based on the diagnosis determination. In addition, the controller is configured to drive the motor adjusted to a second efficiency value when the first reference time period has elapsed. A state of the fuel cell stack is then diagnosed based on a voltage variance of the fuel cell stack between driving the motor adjusted to the first efficiency value and second efficiency value.

Method and system for diagnosing fuel cell stack

A voltage synchronization method and system are provided. The system includes a main controller that is configured to determine whether voltage synchronization is possible. When the voltage synchronization is determined to be possible, the main controller is configured to transmit a voltage synchronization command to a plurality of auxiliary controllers. The plurality of auxiliary controllers are configured to adjust sensed voltages based on an output voltage of a fuel cell stack when the transmitted voltage synchronization command is received.

Voltage synchronization method and system

A fuel cell system and a method for controlling the same are provided. The method includes rapidly increasing an angular speed of a rotating magnetic field of an induction motor to maximize iron loss of the induction motor, thereby resulting in an increase in the temperature of a rise cell stack. The method further includes eliminating torque of a driving motor generated by an increase in the angular speed of the rotating magnetic field, using a torque eliminator. The torque eliminator includes a P-stage reducer or a hydraulic break.

Fuel cell system and method for controlling the same

A device and a method for controlling a cold start of a fuel cell system are provided and are capable of increasing a fuel cell load to reduce a cold start time using a kinetic energy storage method for a rotor of a motor for driving a fuel cell system. The method improves cold start performance by performing self-heating of a fuel cell stack based on an increase in an output current amount of a fuel cell and by restricting a motor torque simultaneously with generating the motor torque while applying a current to a motor when a vehicle stops to consume an output current of the fuel cell.

Growing community of inventors

Seoul, South Korea

Joon Yong Lee