Hyundai Motor Company

Kia Motors Corporation

Seoul National University

Industry-Academic Cooperation Foundation Gyeongsang National University

Hyundai Steel Company

Young Kook Lee

Sung Kyu Kim

Bum Sik Kim

Jin Hwan Jung

Mu Shin Kwak

Jae Won Lee

Ho Joon Shin

Jung Ik Ha

Yong Su Han

Sang Hyeon Moon

Won Kyoung Choi

Heon Young Kwak

Tae Hwan Chung

Jong Kyong Lim

Hun Kong

Chul Woo Kim

Yong Jae Lee

Dong Jun Lee

Su Hyun Bae

Kang Ho Jeong

Shin Hye Chun

Gun Soo Kang

Seong Yeop Lim

Myoung Seok Lee

Woo Yong Jeon

Ju Man Yoon

Joo Yong Yeo

Yeon Seung Jung

Hyo Kyung Sung

Jae Bok Seol

Jung Gi Kim

Hyo Ju Bae

Kwang Gyu Koh

Sin Gon Kang

There is provided a ferritic lightweight steel which contains 2.0 to 3.0 wt % manganese (Mn), 5.0 to 6.0 wt % aluminum (Al) and 0.1 to 0.3 wt % carbon (C) and has a tensile strength of 900 MPa to 1,108 MPa. The lightweight steel includes ferrite-austenite dual grains as a result of performing low-temperature tempering-induced partitioning (LTP) at 300° C. for 10 minutes after isothermal annealing.

Method for manufacturing ferritic lightweight steel and ferritic lightweight steel using same

A torque limit apparatus includes a user interface device that receives a speed setting value and a torque setting value of a motor from a user and outputs a state of the motor and a motor control device that controls a speed of the motor depending on speed set by the user and to interrupt an operation of the motor when torque of the motor reaches torque set by the user.

Torque limit apparatus, electric screwdriver having the same, and method thereof

A charging system for improving a power factor and a current quality in a grid stage is provided. The charging system includes a rectifying circuit that is configured to rectify a grid power and a converter that is configured to receive a voltage-current rectified by the rectifying circuit and convert the voltage-current into a charge voltage-current to be provided to a battery. A capacitor is connected across a connection end of the rectifying circuit and the converter. The converter includes a first high frequency switching circuit, a transformer, and a second high frequency switching circuit.

Charging system without power factor correction circuit

Disclosed herein is a charging system using a wound rotor synchronous motor, capable of increasing a battery charging capacity while reducing the volume, weight, and/or cost of a vehicle increased due to an on-vehicle charging circuit. The charging system includes an inverter converting a DC output of a battery into a plurality of AC signals having different phases, a wound rotor synchronous motor having a plurality of stator coils, to which the AC signals having different phases are respectively input, and a field coil forming a mutual inductance with the stator coils, the field coil being installed in a rotor to form a magnetic flux using the DC output of the battery, and a controller allowing the battery and the field coil to be insulated from each other in a charge mode in which electricity from a grid is applied to the field coil of the wound rotor synchronous motor.

Charging system using wound rotor synchronous motor

Disclosed herein is a charging system using a wound rotor synchronous motor (WRSM), capable of reducing volume, weight, and cost of a vehicle increased due to an on-board charging circuit and increasing a battery charge capacity. The charging system using a wound rotor synchronous motor (WRSM) includes an inverter converting power of a battery into alternating current (AC) powers having a plurality of different phases, a WRSM having a plurality of stator coils each receiving AC power of a different phase and a field coil forming mutual inductance with the plurality of stator coils and installed in a rotor to form a magnetic flux using power of the battery, and a controller controlling the battery side and the field coil side are insulated from each other in a charge mode in which grid power is applied to the field coil side of the WRSM.

A fail-safe method and apparatus for high voltage parts in a hybrid vehicle is provided. In the fail-safe method, it is determined whether or not a high voltage main relay is turned off. Here, when the high voltage main relay is turned off, a voltage is charged into a direct current (DC) link using a counter electromotive force generated in a motor generator linked with a revolution of an engine. Voltage control is performed such that the voltage of the DC link is uniformly maintained using an inverter for the motor generator.

Fail-safe method and apparatus for high voltage parts in a hybrid vehicle

A vehicle charger is provided that receives power from electric vehicle supply equipment to charge a battery mounted within an electric. The charger includes a charging controller that is configured to execute a charging mode of the vehicle charger and a main power supplier that is configured to supply main power to the charging controller. In addition, an auxiliary power supplier is configured to supply battery power as auxiliary power when receiving a control pilot signal generated from the electric vehicle supply equipment. A power controller is configured to detect the control pilot signal and turn the main power supply and the auxiliary power supply on and off based on state information regarding the detected control pilot signal and a charging mode control signal output from the charging controller.

Vehicle charger and method for controlling power thereof

A system and method for controlling energy of an eco-friendly vehicle are provided and include turning off, by a controller, a main relay in response to sensing interlock by means of a detection circuit and charging a secondary batter by discharging voltage of a capacitor in an inverter to the secondary battery, under control of voltage output from a low voltage DC converter after the main relay is turned off. In addition, the controller is configured to discharge DC-link voltage to a driving motor by operating the inverter after charging the second battery.

System and method for controlling energy under interlock of eco-friendly vehicle

An interface circuit for detecting a fault in a resolver is provided. More specifically, the interface circuit includes the resolver connected to an intermediate point of a stator coil of a first output terminal for a sine wave signal and an intermediate point of the stator coil of a second output terminal for a cosine wave signal to output the sine and cosine wave signals as a common mode signal. Also includes is resolver fault detection interface unit that adjusts a gain and an offset of the sine wave signal and the cosine wave signal in order to adjust the sine wave signal and the cosine wave signal received as a common mode signal to a frequency that can be suitably applied to an analog/digital terminal of a microcomputer, and to allow high-frequency components of the sine wave signal and the cosine wave signal to pass therethrough.

Interface circuit for detecting fault of resolver and method thereof

A method for controlling a permanent magnet synchronous motor includes detecting an absolute angular position and using the angular position to calculate a rotational speed of the motor; detecting a voltage of a battery as a power source; calculating a compensated speed from a rotational speed of the permanent magnet synchronous motor based on a torque command, the rotational speed of the permanent magnet synchronous motor, and the battery voltage; generating a d-axis current command and a q-axis current command corresponding to the torque command and the compensated speed; calculating a d-axis voltage command and a q-axis voltage command based on the d-axis current command and the q-axis current command; converting the d-axis voltage command and the q-axis voltage command into three-phase voltage commands based on the detected absolute angular position; and controlling the operation of the permanent magnet synchronous motor based on the three-phase voltage commands.

Method for controlling permanent magnet synchronous motor

The present invention provides a method for measuring the temperature of a motor for a hybrid electric vehicle. In preferred embodiments, the method of the present invention can preferably ensure the stability and reliability of motor control by extending the linearity of a temperature sensor attached to the motor within a required measurement range. The present invention preferably provides a method for measuring the temperature of a motor for a hybrid electric vehicle, in which a required measurement range of motor temperature is divided into high and low temperature ranges and a hardware gain circuit is divided into first and second gain blocks such that the first gain block measures the temperature of the high temperature range and the second gain block measures the temperature of the low temperature range.

Method for measuring temperature of motor for hybrid electric vehicle

The present invention provides a method for compensating nonlinearity of a resolver to control a motor in hybrid and fuel cell vehicles, thereby stably controlling the motor current during high-torque and high-speed operation. In preferred aspects, the present invention provides a method for compensating nonlinearity of a resolver to control a motor in hybrid and fuel cell vehicles, the method including collecting resolver position data; determining whether to perform resolver position correction in the corresponding vehicle; and compensating nonlinearity of the resolver based on the collected resolver position data, if it is determined that the resolver position correction is not performed.

Method for compensating nonlinearity of resolver for hybrid and fuel cell vehicles

The present invention provides an emergency control apparatus, and method which maintains the power flow between a battery and an inverter and the operation state of an electric vehicle in the event of failure of a bidirectional DC-DC converter connected between the battery as a power source and the inverter for operating a drive motor.

Growing community of inventors

Seoul, South Korea

Young Kook Lee