Abstract: A failure determination method for a motor system includes setting a current value required to initially drive a motor to a first current command value, increasing a rotational speed of a rotating magnetic field of the motor up to a preset reference speed, comparing an intensity of a back electromotive force, generated when a rotor of the motor is rotated at the preset reference speed, to a magnitude of a voltage applied to apply current in accordance with the set first current command value, and determining a cause of a failure of the motor based on the comparison.

Abstract: A system and method for a cold start of a vehicle are provided. The method includes setting a target electrical angle by adding a setting angle to a previously stored initial electrical angle of a driving motor and applying an electric current value that corresponds to the set target electrical angle to the driving motor.

Abstract: 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.

Abstract: A method and system for computing a motor speed and a rotor position using a hall sensor are provided. The method improves precision for computing the speed of the motor rotating at a high speed and the rotor position using the hall sensor based on configurations, such as the hall sensor mounted in the motor as a position sensor, a motor controller configured to receive a signal of the hall sensor to operate the motor, and a microcomputer configured to store a time when the motor controller senses the timing of a change in the signal of the hall sensor.

Abstract: 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.

Abstract: A system and method for a cold start of a vehicle are provided. The method includes setting a target electrical angle by adding a setting angle to a previously stored initial electrical angle of a driving motor and applying an electric current value that corresponds to the set target electrical angle to the driving motor.

Abstract: A fuel cell system and a method tor 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.

Abstract: A failure determination method for a motor system includes setting a current value required to initially drive a motor to a first current command value, increasing a rotational speed of a rotating magnetic field of the motor up to a preset reference speed, comparing an intensity of a back electromotive force, generated when a rotor of the motor is rotated at the preset reference speed, to a magnitude of a voltage applied to apply current in accordance with the set first current command value, and determining a cause of a failure of the motor based on the comparison.

Abstract: A motor torque control method for an air blower may include: setting a phase current command value of a motor of the air blower based on a temperature of the motor, calculating a d-axis current command value other than zero in compliance with the set phase current command value, and outputting the calculated d-axis current command value.

Abstract: A method and system for controlling an inverter for operating a motor are provided. The method includes reducing a switching frequency of the inverter for applying a load current to the motor when the motor is used for energy consumption. Reduction of the switching frequency of the inverter enhances damage prevention and durability of the inverter. In the method, an operation mode of the inverter for operating the motor is determined based on a command received from an upper-level controller. When the operation mode of the inverter is determined to be an energy consumption mode, a switching frequency of the inverter is decreased relative to the switching frequency in a general operation mode.

Abstract: A film for a display window using a roll to roll method and a method of manufacturing the same includes forming a bonding layer or a release layer on a fabric film using a roll to roll method, and forming a decorative layer having a pattern or a color on the bonding layer or the release layer using the roll to roll method. When the film is manufactured by the roll to roll process, it is possible to improve productivity and reduce a unit price.

Abstract: A method for controlling a driving motor method includes comparing revolutions per minute of the driving motor with a magnitude of a medium and high speed reference speed. A current and a voltage applied to the driving motor are calculated to thereby calculate an input power when the revolutions per minute of the driving motor is larger than the medium and high speed reference speed. A q-axis current instruction is adjusted based on whether or not the calculated input power is in a zero-torque determination reference power range.

Abstract: Provided is a system and method for calibrating an offset of a resolver in a motor of a vehicle. More specifically, a current is applied to the ?d-axis of the motor, the Vq, Vd, Iq, and Id of the motor is measured and a power input to the motor is calculated by a controller, and when the input power is not within a predetermined range, the controller adjusts the offset of the resolver to a positive or negative value accordingly.

Abstract: The present invention provides a technique for controlling creep torque to prevent a vehicle from rolling backward on an upward slope. In particular, a gradient of a road is calculated in real time from a detection value of a sensor and vehicle acceleration. A maximum creep torque for preventing roll-back caused by gravity according to the gradient is calculated using the gradient and vehicle information. A first creep torque reference is calculated based on the maximum creep torque and the vehicle speed. A second creep torque reference is calculated based on the maximum creep torque and the vehicle acceleration. A torque command value according to an operation state of a brake is calculated based on the first creep torque reference value and the second creep torque reference value and the gradient. In response, a torque output of a driving motor is controlled according to the calculated torque command value.

Abstract: A system for accessing to vehicle network includes a gateway extracting requested information from an in-vehicle network to transfer to an external device when an information request of the external device is a pre-registered inspect request and outputting a selection signal for a sector which an authenticated external device requested after performing an authentication for the external device when the information request is not the pre-registered inspect request. The system further includes a signal transmitter connecting the external device with the in-vehicle network corresponding to the sector that the external device requests when the selection signal is received from the gateway.

Abstract: The present invention provides a power distribution device and method for a fuel cell-supercapacitor hybrid vehicle, which can prevent an initial discharge of a supercapacitor during acceleration of the fuel cell-supercapacitor hybrid vehicle and, at the same time, enable the supercapacitor to provide power assist during high speed and high power operation. The power distribution device includes a relay mounted on a charge/discharge line between a fuel cell and a supercapacitor, a unidirectional buck converter disposed between an output terminal of the supercapacitor and a bus terminal of the fuel cell and outputting supercapacitor energy to the bus terminal of the fuel cell only when power assist is required, and a control means controlling the operation of the relay and the unidirectional buck converter.

Abstract: Provided is a system and method for calibrating an offset of a resolver in a motor of a vehicle. More specifically, a current is applied to the ?d-axis of the motor, the Vq, Vd, Iq, and Id of the motor is measured and a power input to the motor is calculated by a controller, and when the input power is not within a predetermined range, the controller adjusts the offset of the resolver to a positive or negative value accordingly.

Abstract: The present invention provides a position sensorless control method of a high performance permanent magnet synchronous motor during emergency operation, which can accurately detect a magnetic pole position of the synchronous motor based on a position sensorless vector control using an adaptive observer configured based on a permanent magnet synchronous motor model.

Abstract: The present invention provides an apparatus and method for controlling motor position and creep of an electric vehicle, in which when a running vehicle is stopped, motor position control for maintaining the vehicle in the stopped position even when a brake pedal is released is performed, and then creep torque control is performed such that the vehicle is prevented from rolling backwards and suddenly starting when the vehicle is restarted after a stop on a slope.

Abstract: The present invention provides a technique for controlling creep torque to prevent a vehicle from rolling backward on an upward slope. In particular, a gradient of a road is calculated in real time from a detection value of a sensor and vehicle acceleration. A maximum creep torque for preventing roll-back caused by gravity according to the gradient is calculated using the gradient and vehicle information. A first creep torque reference is calculated based on the maximum creep torque and the vehicle speed. A second creep torque reference is calculated based on the maximum creep torque and the vehicle acceleration. A torque command value according to an operation state of a brake is calculated based on the first creep torque reference value and the second creep torque reference value and the gradient. In response, a torque output of a driving motor is controlled according to the calculated torque command value.