Hyundai Motor Company

Kia Motors Corporation

Kia Corporation

Suprema Inc.

Other

Seoul National University

Osong Medical Innovation Foundation, Korea University Research and Business Foundation

Industry-university Cooperation Foundation Hanyang University

Jae Hyeon Park

Yong Jae Lee

Jae Ho Hwang

Joo Young Park

Jung Hwi Kim

Jung Mo Yu

Jae Won Lee

Ji Hoon Kim

Hyun Sik Kim

Bong Seop Song

Jee Hun Park

Soung Han Noh

Dong Mok Shin

Tae Whan Kim

Sang Jin Lee

Jae-Sung Rieh

Kyung Jin Lee

Do Yoon Kim

BoGun Park

Chaoxing Wu

Joo Ok Park

Won Sik Lim

Heuk Jin Lee

SungHa Kim

A motor driving apparatus of driving a motor including a plurality of windings respectively corresponding to a plurality of phases is disclosed The motor driving apparatus includes a first inverter including a plurality of first switching elements and connected to a first end of each of the windings, a second inverter including a plurality of second switching elements and connected to a second end of each of the windings, and a controller connected to the first switching elements and the second switching elements and configured to determine an effective vector closest to a voltage vector corresponding to a preset voltage command of the motor as a duty of the plurality of second switching elements and to control pulse width modulation of the first switching elements using a value obtained by adding the effective vector corresponding to the duty of the second switching elements to the voltage command of the motor as a voltage command of the first inverter.

Motor driving apparatus

A method for calculating a degradation degree of a damper clutch of an automatic transmission of a vehicle includes: filtering, by a controller, a vibration signal of the vehicle according to driving of the vehicle in order to remove a vibration signal of the vehicle corresponding to a natural frequency of an engine of the vehicle from the vibration signal of the vehicle according to the driving of the vehicle; converting, by the controller, the filtered vibration signal into a signal including a sinusoidal wave having a natural frequency of the automatic transmission based on a gear stage of the automatic transmission of the vehicle by using a frequency analysis method; and calculating, by the controller, a degradation degree of the damper clutch included in a torque converter of the automatic transmission based on a magnitude of the sinusoidal wave having the natural frequency of the automatic transmission.

Method and apparatus for calculating degradation degree of a damper clutch of an automatic transmission of a vehicle

A battery heating system and method using a motor driving system are provided. A temperature of a battery is increased by injecting an alternating current into the battery so that charging and discharging of the battery is repeated using the motor driving system including an inverter and a motor provided in a vehicle.

Battery heating system and method using motor driving system

A battery-heating system and method using a motor-driving system is provided. The battery-heating system includes an inverter having legs respectively including a pair of switching elements connected in series between the ends of a battery and corresponding to a plurality of phases. A motor of the system includes coils each having one end connected to a connection end between a pair of switching elements of the legs, other ends of the plurality of coils being connected together. A controller determines one of the plurality of phases as a reference phase, and alternately controls the on-off states of the switching elements so that the on-off state of the switching element included in the leg corresponding to the reference phase and the switching element included in the other leg are mutually complementary, thereby generating AC current to be injected into the battery.

System and method for heating battery using motor driving system

A DC-to-DC converter includes a first capacitor, first to fourth switches connected in series between first and second electrodes of the first capacitor, a second capacitor connected to a connection node of the first switch and the second switch and a connection node of the third switch and the fourth switch, an inductor connected to a connection node of the second switch and the third switch, and a controller that performs PWM control. In a case where a failure occurs in the second capacitor, the DC-to-DC converter performs PWM control such that the first switch and the second switch enter the same state and the third switch and the fourth switch enter the same state on the basis of a result of comparison between a first detection voltage that is a measured output voltage and a target output voltage of the DC-to-DC converter.

DC-to-DC converter capable of operating despite capacitor failure

A DC-to-DC converter includes a first capacitor, first, second, third, and fourth switches connected in series between first and second electrodes of the first capacitor, a second capacitor connected to a connection node of the first switch and the second switch and a connection node of the third switch and the fourth switch, an inductor connected to a connection node of the second switch and the third switch, and a controller that controls an on/off state of each of the first to fourth switches on the basis of a value obtained by applying a reciprocal of a detection current that is a measured current flowing through the inductor to a difference between a first detection voltage and a first voltage instruction value and a difference between a second detection voltage and a second voltage instruction value.

DC-to-DC converter including flying capacitor

Disclosed is an ultra low power transimpedance amplifier based on spintronics. According to the present invention, provided is an ultra low power transimpedance amplifier based on spintronics, which includes: a spintronics based oscillator receiving current and outputting an alternating signal by using spin transfer torque or spin orbit torque; a bandpass filter passing a signal in a predetermined frequency band of the alternating signal output by the spintronics based oscillator; and a spintronics based detector outputting voltage by inputting the signal in the predetermined frequency band, which is output by the bandpass filter.

Ultra low power transimpedance amplifier based on spintronics

An apparatus and method for diagnosing analysis is provided. The apparatus includes an analytic layer to divide a peripheral space of a target component into a plurality of cells and to derive analytic data by performing a numerical analysis iteration according to computational fluid dynamics for the plurality of cells; a model layer to derive an analytic model that simulates the numerical analysis iteration; a predictive layer to derive predictive data by predicting a result of the numerical analysis iteration by using the analytic model; and a diagnostic layer to diagnose an abnormality condition of numerical analysis by comparing the analytic data and predictive data during the numerical analysis iteration performed by the analytic layer. The diagnostic layer includes an early alarm to generate early alarm information by sorting a cell satisfying an early alarm condition; and an abnormality diagnostic device to determine whether the numerical analysis iteration is abnormal.

Apparatus for diagnosing analysis and method therefor

A flying DC-to-DC converter has a capacitor protection function of preventing a flying capacitor from overheating. The flying DC-to-DC converter estimates the temperature of a capacitor on the basis of a switching duty and an inductor current determined according to a result of comparison between an output voltage and a voltage instruction value, and determines whether to perform de-rating.

DC-to-DC converter

A paper-based triboelectric nanogenerator and a method of manufacturing the same are disclosed. The paper-based triboelectric nanogenerator of the present disclosure includes a sandwich structure including a first paper, conductive papers formed on the first paper and each including an electrode composed of a mesh-type conductive nanomaterial, and a second paper formed on the conductive papers; and a polymer film formed in a selective area on the second paper, wherein the number of the conductive papers formed on the first paper is two; the two conductive papers are formed so as to be spaced apart from each other in the horizontal direction; and the polymer film formed in the selective area is formed only in the upper area of one of the two conductive papers.

Paper-based triboelectric nanogenerator and method of manufacturing the same

A spindle apparatus according to the present disclosure includes a housing, a spindle rotatably installed in the housing, a tool releasably engaged with one end of the spindle and having an insert tip movable in a radial direction of the tool, a first draw-bar movably mounted in the spindle, and a second draw-bar movably mounted in the first draw-bar. The tool and one end of the first draw-bar are releasably engaged with the one end of the spindle by a movement of the first draw-bar, and the insert tip is configured to move in the radial direction by a movement of the second draw-bar.

Spindle apparatus and operating method thereof

A method for controlling plural chargers equipped in a vehicle includes: recognizing a plurality of chargers, each configured to charge at least one battery supplying the vehicle with electric power, via an in-vehicle network; receiving an identification and at least one parameter from each recognized charger, which are delivered via the in-vehicle network; generating plural instructions, each instruction for each recognized charger in response to receiving the identification and the at least one parameter; and delivering the plural instructions to the plurality of recognized chargers via the in-vehicle network.

Apparatus and method for charging electric vehicle via plural chargers

In accordance with an embodiment, the prism is made slimly to correct the distortion of the fingerprint image such as trapezoidal distortion or the like. Therefore, it is possible to manufacture the optical fingerprint recognition apparatus of a compact size. Further, the imaging lens is arranged to have a de-centering amount and/or a tilt angle with respect to the optical axis, which leads to an effect to implement resolution approaching the diffraction limit.

Optical fingerprint recognition apparatus

An optical structure for acquiring a fingerprint image with high resolution and minimum distortion is provided. The optical structure includes a prism configured to comprise an input surface to which light is irradiated, a contact surface formed horizontally to be in contact with a finger, and an output surface through which the light that has been irradiated to the input surface and reflected from the finger in contact with the contact surface passes; a lighting unit configured to emit a beam to the input surface of the prism; a reflector unit configured to reflect a fingerprint image passing through the output surface of the prism; a lens unit configured to comprise two or more lenses, each being configured to receive the fingerprint image reflected from the reflector unit; and an image sensor on which the fingerprint image passing through the lens unit is formed.

Growing community of inventors

Seoul, South Korea

Jae Hyeon Park