• Title/Summary/Keyword: advance angle control

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SI Engine Closed-loop Spark Advance Control Using Cylinder Pressure (실린더 압력을 이용한 SI엔진의 페루프 점화시기 제어에 관한 연구)

  • Park, Seung-Beom;Yun, Pal-Ju
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.9 s.180
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    • pp.2361-2370
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    • 2000
  • The introduction of inexpensive cylinder pressure sensors provides new opportunities for precise engine control. This paper presents a control strategy of spark advance based upon cylinder pressure of spark ignition engines. A location of peak pressure(LPP) is the major parameter for controlling the spark timing, and also the UP is estimated, using a multi-layer feedforward neural network, which needs only five pressure sensor output voltage samples at -40˚, -20˚, 0˚, 20˚, 40˚ after top dead center. The neural network plays an important role in mitigating the A/D conversion load of an electronic engine controller by increasing the sampling interval from 10 crank angle(CA) to 20˚ CA. A proposed control algorithm does not need a sensor calibration and pegging(bias calculation) procedure because the neural network estimates the UP from the raw sensor output voltage. The estimated LPP can be regarded as a good index for combustion phasing, and can also be used as an MBT control parameter. The feasibility of this methodology is closely examined through steady and transient engine operations to control individual cylinder spark advance. The experimental results have revealed a favorable agreement of individual cylinder optimal combustion phasing.

Reduction of Torque Ripple in a BLDC Motor Using an Improved Voltage Control (개선된 전압제어를 이용한 BLDC 전동기의 토크맥동저감)

  • Song, Jeong-Hyun;Jang, Jin-Seok;Kim, Byung-Taek
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.2
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    • pp.145-150
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    • 2010
  • This paper deals with reduction of torque ripple in a brushless DC motor with input voltage control. The commutation torque ripple can be controlled with varying input voltage, but cogging torque is independent on it. So, in this paper a strategy for minimizing torque ripple is proposed by offsetting the cogging torque with deliberate voltage control. The optimal condition is determined with variable voltage levels and advance angles. As results, it is shown that the method causes 63% decrease of torque ripple.

PATH CONTROL FOR NONLINEAR VEHICLE MODELS (비선형 차량모델 모의 실험의 경로제어)

  • J.N. Lee
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.383-387
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    • 1996
  • This paper presents a steering control strategy applicable to vehicle path following problems. This control strategy is based on realistic nonlinear equations of motion of multibody systems described in terms of relative joint coordinates. The acceleration of the steering angle is selected as a control input of the system. This input is obtained by considering position and slope errors at current and at advance times. This steering control strategy is tested in circular and lane change maneuvers with a nonlinear vehicle model.

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Driving of Switched Reluctance Motor to Reduce Torque Ripple (맥동 토오크 저감을 위한 스위치드 리럭턴스 전동기 구동에 관한 연구)

  • 오인석;성세진
    • The Transactions of the Korean Institute of Power Electronics
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    • v.2 no.2
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    • pp.49-56
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    • 1997
  • Switched Reluctance Motors(SRMs) have a considerable inherent torque ripple due to the driving characteristics of pulse current waveform and the nonlinear variation inductance profile. This paper describes a current shape characteristics to effect a torque ripple reduction, and one pulse mode switching control method is proposed to minimize torque ripple of a switched reluctance motor regardless of speed and load condition by regulating tow parameters, such as, advance angle and exciting voltage. The experiments are performed to verify the capability of proposed switching method on 6/4 salient type SRM.

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Development of Caravan Sway Reduction System using the Hitch Angle Control Algorithm (히치 각도 제어 알고리즘을 통한 카라반 스웨이 저감 장치 개발)

  • Kim, Chang-Young;Yoo, Jung-Joo;Byun, Kyung-Seok
    • Journal of the Institute of Convergence Signal Processing
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    • v.22 no.4
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    • pp.171-178
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    • 2021
  • Caravans are easily affected by external physical factors and often cause dangerous situations for passengers. Therefore, in order to secure the stability of the passenger, there is a need to develop a sway reduction device capable of preventing the sway phenomenon in advance. This paper aims to minimize the hitch angle between the tow vehicle and the caravan. Specifically, the initial instability of the caravan is detected through an IMU sensor mounted on each of the tow vehicle and the caravan, and a control value is calculated to reduce errors from the Hitch angle and Hitch yaw rate using a PID controller. Different braking torques are generated, distributed, and controlled on the left and right brakes of the caravan according to the calculated control value. It could be verified through the driving experiment that the hitch angle was decreased compared to the case where the performance of the sway reduction device was not controlled, and the transverse stability improvement rate was improved by 94.49% compared to before control.

A study on pilot Test of the Composition Presplitting Angle Cut method in tunnel blasting (터널 심발부의 선균열을 이용한 발파공법의 현장시험에 관한 연구)

  • Hwang, Hak;Lee, Tai Ro
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.4 no.4
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    • pp.287-300
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    • 2002
  • Composition Presplitting Angle Cut (COPA-Cut) is a newly developed blasting method for tunnel excavation. Contrary to existing methods, COPA-Cut first creates presplitting by tension crack in cut. In this study, field tests measuring the advance efficiency, noise and ground vibration were performed in order to verify the presplitting effect. To compare the economy and workability, tests were simultaneously performed by COPA-Cut and existing method on the same condition. Results show that COPA-Cut increased advance efficiency and decreased noise and ground vibration. Also, it was confirmed that COPA-Cut is superior to existing method in terms of economy, workability and quality control.

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Design of SRM according to Design Parameters (SRM의 고효율 구동을 위한 PLL 제어방식)

  • Kim Tae-Hyung;Oh Seok-Gyu;Ahn Jin-Woo
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.985-987
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    • 2004
  • Switched Reluctance Motor(SRM) drive system is known to provide good torque characteristics and high efficiency drive. However, speed variation caused by higher torque ripple is one of main drawback. The Phase-Locked Loop (PLL) technique in conjunction with dynamic dwell angle control has good speed regulation characteristics. In this paper, appropriate advance angle control for high efficiency drive and PLL technique for accurate speed control is proposed. A TMS320F240 DSP is used to realize this drive system. Test results show that the system has good dynamic and precise speed control ability as well as high efficiency.

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An Improved Current Control Method for Torque Improvement of High Speed BLDC Motor (고속도 BLDC 전동기의 토크 향상을 위한 개선된 전류 저어 방법)

  • Park Sung-In;Kim Tae-Sung;Hyun Dong-Seok
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.115-118
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    • 2002
  • In this paper, a current control method using adjustment of the phase advance angle is proposed. This proposed method improves the torque and speed response characteristic by minizing delay of current at high speed operation, and also make reverse motoring possible. Simulated results prove the effectiveness of the propposed method through comparison with the conventional unipolar PWM method.

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Torque Maximization Control of 3-Phase BLDC Motors in the High Speed Region

  • Im, Won-Sang;Kim, Jong-Pil;Kim, Jang-Mok;Baek, Kwang-Ryul
    • Journal of Power Electronics
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    • v.10 no.6
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    • pp.717-723
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    • 2010
  • This paper proposes a new torque control algorithm for BLDC motors to get the maximum torque in the high speed region. The delay of the phase currents is severe due to the stator reactance. The torque fluctuations of BLDC motors increase and the average torque is decreases due to a slow rise in the phase current when compared to the back EMF. In this paper, the phase current of BLDC motors under the high speed condition is analyzed and a torque maximization control is developed on the basis of using numerical analysis. Computer simulations and experimental results show the usefulness of the proposed control algorithm.

Design and Implementation of UAV's Autopilot Controller

  • Lee, Jeong-Hwan;Lee, Ki-Sung;Jeong, Tae-Won
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.52-56
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    • 2004
  • Unmanned Aerial Vehicles (UAVs) are remotely piloted or self-piloted aircraft by inputted program in advance or artificial intelligence. In this study Aileron and Elevator are used to control the movement of airplane for horizontal and vertical flights about its longitudinal and lateral axis. In an introduction, the drone was linearly modeled by extracting aerodynamic parameter through flight test and simulation, lift and drag coefficient corresponding to angle of attack, changes of pitching moment coefficient. In the main subject, the flight simulation was performed after constructing hardware using TMS320F2812 from TI company and PID with lateral and longitudinal controller for horizontal and vertical flights. Flying characteristics of two system were estimated and compared through real flight test with hardware equipped algorithm and adaptive algorithm that was applied to consider external factors such as turbulence. In conclusion the control performance of the controller with proposed algorithm was streamlined at lateral and longitudinal controller respectively, we will discuss guidance command to pass way point.

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