• Title/Summary/Keyword: Idling

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Fault Diagnosis Method of Permanent Magnet Synchronous Motor for Electrical Vehicle

  • Yoo, Jin-Hyung;Jung, Tae-Uk
    • Journal of Magnetics
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    • v.21 no.3
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    • pp.413-420
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    • 2016
  • The permanent magnet synchronous motor has high efficiency driving performance and high power density output characteristics compared with other motors. In addition, it has good regenerative operation characteristics during braking and deceleration driving condition. For this reason, permanent magnet synchronous motor is generally applied as a power train motor for electrical vehicle. In permanent magnet synchronous motor, the most probable causes of fault are demagnetization of rotor's permanent magnet and short of stator winding turn. Therefore, the demagnetization fault of permanent magnet and turn fault of stator winding should be detected quickly to reduce the risk of accident and to prevent the progress of breakdown of power train system. In this paper, the fault diagnosis method using high frequency low voltage injection was suggested to diagnose the demagnetization fault of rotor permanent magnet and the turn fault of stator winding. The proposed fault diagnosis method can be used to check the faults of permanent magnet synchronous motor during system check-up process at vehicle starting and idling stop mode. The feasibility and usefulness of the proposed method were verified by the finite element analysis.

A Study on the Variation of Air Pollutants Emission Rates for Different Traffic Signal System in Metropolitan Area (대도시 교통신호시스템에 따른 대기오염물질 배출량 변화에 관한 연구)

  • 홍민선;우완기;최종인
    • Journal of Korean Society for Atmospheric Environment
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    • v.9 no.1
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    • pp.93-100
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    • 1993
  • This study was carried out to investigate the relationship between the traffic signal systmes and the air pollutants emitted by the motor vehicles at Kangnam Intersection. One of the most important measures of effectiveness (MOE) in traffic studies is the delay to vehicles in the system. Delay represents indirect costs to the motorist in terms of time loss and a direct cost in terms of fuel consumption during idling. The results of TRANSYT-7F modeling was correlated among delay, fuel consumption and total travel tiem. Air pollutants emission rate can be calculated by the results of modeling and the Korean type emission factor. As expected the highest emissions, for air pollutants, are observed during the morning rush hours (07 : 00-10 : 00). For better results of modeling, the TRANSYT-7F model needs to modify for the Korean type of traffic model. The results of this study indicate that the variation of air pollutants emission rates were closely related to the traffic signal system.

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Computer Simulation for Design of Minimum Vibration Mount System in Variable Displacement Engine (可變기통 엔진에서의 最小振動 마운트系 設計를 위한 電算시뮬레이션)

  • 이종원;정경열;곽윤근
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.10 no.3
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    • pp.305-315
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    • 1986
  • Redesign of the mounting system to minimize vibration of a variable displacement engine through computer simulation is considered. A three degree of freedom model is established for an in-line four-cylinder automobile engine with a three point mounting system. The engine mount locations and angles, and isolator sizes are chosen as design parameters. Constraints on isolator deformations and design parameters are imposed. The gradient projection method is utilized for optimization. Simulation studies show significant vibration reduction can be obtained especially at idling speed.

Cam Profile Design for Impulsive Noise Reduction of Automotive Engine Valve Train (자동차 엔진 밸브트레인의 타음감소를 위한 캠 형상 설계)

  • An, Ki-Yong;Kim, Do-Joong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.4
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    • pp.139-148
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    • 2006
  • Valve train is one of the important noise sources in idling engines. Valve train noise comes mostly from two different impacts. One is the impact between cam and tappet at the beginning of the valve open period, which is an important source of impulsive noise of valve trains. The other is the impact between valve and valve seat at the closing of the valve open period. In case of mechanical lash adjusters, it is very difficult to control the initial impact. In this paper, we designed various types of cam profiles, especially in the opening ramp design, and investigated the effect of cam profiles on the magnitude of the initial impact. The effects that some cam design parameters have on the impulsive noise are also observed.

A study on the performance of the perforated tube exhaust muffler (다공형 배기 소음기의 성능에 관한 연구)

  • 권영필;이동훈;방정환
    • Journal of the korean Society of Automotive Engineers
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    • v.14 no.6
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    • pp.48-59
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    • 1992
  • This study is on the performance of the perforated tube muffler when it operates as an exhaust silencer with through-flow, steady or pulsating. Theoretical estimation of the insertion loss was made by means of transfer matrix and by using the impedance equation for the perforated tube obtained for the case of low-speed steady through-flow. Experiment was performed for the measurement of the insertion loss at two flow conditions. The one is a steady flow from the exhaust pipe of an idling diesel engine. The effect of the through-flow velocity and steadiness on the muffler performance was obtained. By comparing the theoretical prediction with the experimental result, the validity of the impedance equation in the theoretical model was discussed. It has been found that steadiness as well as magnitude of the through-flow has a significant effect on the performance of the perforated tube muffler. Especially, the self-noise due to the pulsating flow in the engine exhaust system must be taken into account for the prediction of the muffler performance.

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Realization of Internet Supercomputing Technology (인터넷 수퍼컴퓨팅 기술의 구현)

  • 김승조
    • 한국전산유체공학회:학술대회논문집
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    • 2000.10a
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    • pp.1-8
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    • 2000
  • In this work, Internet Supercomputing methodology is introduced and the concept is materialized for large-scale finite element analysis. The primary resources of Internet Supercomputing are numerous idling PCs connected by Internet with no regards to their locations. Therefore, it becomes one of the most affordable ways to achieve supercomputing power unlimitedly if the appropriate parallel algorithm and the operating program are developed for this slow network environment. Under the above concept, virtual supercomputing system InterSup I is constructed and tested. To establish the InterSup I system, 64 CPU nodes, which are located in several places and connected by Internet, are conscripted, and parallel finite element software is developed for linear static analysis of structures based on the parallel multi-frontal algorithm. By the established InterSup I system, analysis of finite element structural model having around five million DOFs are solved to check the affordability and effectiveness of Internet Supercomputing.

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A Study on the Development of an Electronic Control System for Optimal Start and Idle Speed Control in Gasoline Engines (기솔린 기관에서 최적의 시동 및 공회전 속도제어를 위한 전자 제어장치 개발에 관한 연구)

  • 김태훈
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.5
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    • pp.1148-1160
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    • 2001
  • An electronic control system of the automobile engine for optimal start and idle speed control has been developed. This system employs the microcoputer-based electronic control unit and crank angle sensor for precise control on fuel injection, ignition timing, and idle speed more quickly and accurately at the start and idling. Consequently, the number of misfire can be reduced during been affected by air flow rate, idle quality(roughness), spark timing, fuel injection, water temperature, and load, Thus, this electronic control system strivers to reach the optimal idle operating point, defined the lowest idle speed(fuel economy) and idle quality(roughness), under any engine operating conditions.

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Fast Speaker Adaptation Based on Eigenspace-based MLLR Using Artificially Distorted Speech in Car Noise Environment (차량 잡음 환경에서 인위적 왜곡 음성을 이용한 Eigenspace-based MLLR에 기반한 고속 화자 적응)

  • Song, Hwa-Jeon;Jeon, Hyung-Bae;Kim, Hyung-Soon
    • Phonetics and Speech Sciences
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    • v.1 no.4
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    • pp.119-125
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    • 2009
  • This paper proposes fast speaker adaptation method using artificially distorted speech in telematics terminal under the car noise environment based on eigenspace-based maximum likelihood linear regression (ES-MLLR). The artificially distorted speech is built from adding the various car noise signals collected from a driving car to the speech signal collected from an idling car. Then, in every environment, the transformation matrix is estimated by ES-MLLR using the artificially distorted speech corresponding to the specific noise environment. In test mode, an online model is built by weighted sum of the environment transformation matrices depending on the driving condition. In 3k-word recognition task in the telematics terminal, we achieve a performance superior to ES-MLLR even using the adaptation data collected from the driving condition.

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Evaluation of Vibration Characteristics and Machinability of High Speed Machining Center (고속 머시닝센터의 진동특성 및 가공성 평가)

  • 강익수;강명창;김정석;김기태
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.04a
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    • pp.424-429
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    • 2004
  • The high speed machining center(HMC) has been widely applied to manufacture a die and trial product in many machine industry. Because the evaluation for HMC is not sufficiently performed and the efficient cutting conditions can't be selected, a peat loss has been caused in the cost aspect. In this study, the need of preliminary running time and unstable spindle speed is presented by the analysis of acceleration in idling. The Machinability for the TiA1N coated flat end mill and STD11 (H$\sub$R/C60) is evaluated from the trends of tool wear and cutting force according to cutting conditions . The resonance spindle speed is identified through the tool wear and natural frequency test.

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DEVELOPMENT OF RED-PEPPER CRUSHER

  • Park, H.M.;Jeong, S.G.;Choi, H.S.;Hong, S.G.;Chung, J.H.
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2000.11c
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    • pp.803-810
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    • 2000
  • Red pepper powder is produced from dried red pepper through milling process with roller mill. Traditional Roller mill is convenient for crushing wax and fiber parts in red pepper. However, some metallics are produced by the friction of two rollers when it operates without feeding of red peppers. In order to reduce this metallic problems created in the roller mill in the process of red pepper, a new roller mill mechanism which enables two roller to apart when red pepper is not fed between two rollers was introduced. Adjustment of clearance between two rollers was able to conducted by the current difference between idling and crushing process. Two types of roller surface, grove and flat, and two different roller mills, cast iron and Ti coating, are tested and compared in this experiment.

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