• Title/Summary/Keyword: Engine Idle RPM

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Controller Design for Stable Engine Idle Mode (안정한 엔진 공회전 모드를 위한 제어기 설계)

  • 이영춘;방두열;이성철
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.6
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    • pp.89-95
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    • 2000
  • The engine idle speed mode becomes worse as one drives a vehicle for several years. This is due to ageing of engine and power-train parts. In this case, unstable idle conditions such as engine stall and droop are frequently experienced when the engine gets heavy torque loads due to power steering pump and air conditioning compressor. The objective of this paper is to study on the idle speed control using PID controller under load disturbances. The input of the PID controller is an error of rpm. The output of the PID controller is an ISCV duty cycle. The dSPACE Controller Boards are used to interface with engine. The on-vehicle test is realized using by SIMULINK and BLOCKSETS tools. The real time interface control panel supplied by Control Desk S/W is designed to have good results in engine idle speed control.

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Design of Optimal Idle Speed Controller by Sliding Mode Observer (슬라이딩 모드 관측기에 의한 최적의 공회전 제어기 설계)

  • Lee, Young-Choon;Lee, Seong-Cheol
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.10
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    • pp.161-167
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    • 2001
  • This paper presents an approach to nonlinear engine idle controller and intake manifold absolute pressure(MAP) observer based on mean torque production model. A stable engine idle speed is important in that the unstable engine Idle mode can make engine to drooping or stall state. A sliding fuzzy controller has been designed to control engine idle speed under load disturbance. A sliding observer is also developed to estimate the intake manifold absolute pressure and compared with the actual MAP sensor value. The sliding mode observer has shown good robustness and good tracking performance. The inputs of sliding fuzzy controller are the errors of rpm and MAP. The output is a duty cycle(DC) for driving a idle speed control valve(ISCV).

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Study on the Apply Characteristics to the Gasoline Engine of Exhaust Heat Recovery Device Counterflow (대향류식 배기열 회수장치의 가솔린기관 적용 특성에 관한 연구)

  • Shin, Suk-Jae;Kim, Jong-Il;Jung, Young-Chul;Choi, Doo Seuk
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.4
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    • pp.153-158
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    • 2013
  • The purpose of this study is to investigate the performance characteristics of the counterflow exhaust heat recovery device for the applied gasoline engines. The EHRS device is installed behind the catalyst. This study investigates the engine warm-up characteristic, the exhaust noise characteristic, the back-pressure characteristic. The engine warm-up characteristics is (load 0%, load 10%, load 20%) in (idle, 1000rpm, 1500rpm, 2000rpm, 2500rpm) conditions by measuring the time it warmed up, coolant temperature ($25^{\circ}C{\sim}80^{\circ}C$) until the performance evaluation is performed. The wide open throttle and the coast down the exhaust noise and the back-pressure characteristic experiment repeated twice. The test conditions is 950rpm~6,050rpm proceed experiment repeated 3-5 times. Load 0% idle conditions except the results improved engine warm-up characteristics. The exhaust noise obtain similar results the BASE+EHRS W/O_FRT_MUFF with BASE and back-pressure to obtain similar results BASE+EHRS W/O_FRT_ MUFF with BASE+EHRS.

A Study on the Improvement of Combustion Stability for SI Engine at Idle Operation (SI 기관의 공회전시 연소 안정성 향상에 관한 연구)

  • Lee, J.S.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.6
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    • pp.259-266
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    • 1998
  • In the SI engine, the improvement of combustion stability is important not only for the fuel consumption rate but also for the emission control at idling of engine. Thus the engine speed fluctuation at idle operation mainly comes from cyclic variation of combustion in the SI engine. In this syudy, the improvement of combustion stability for the SI engine at idle condition by the cooling water temperature, duty ratio of ISC, spark ignition timing as well as the reducement of the harmful exhaust gas emission was discussed.

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Effects of Warm-up Performance on SI Engine with Exhaust Heat Recovery System (배기열 회수장치 적용에 따른 SI 엔진의 웜업 성능에 미치는 영향)

  • Park, Kyoun-Suk;Suh, Ho-Cheol;Park, Sun-Hong;Kim, In-Tae;Jang, Sung-Wook
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.6
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    • pp.53-60
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    • 2011
  • The effect of exhaust heat recovery system can be evaluated by two well known method. First method is to measure the time duration from engine start under cold coolant temperature till coolant get warmed. By this methodology coolant warming duration can be index of warm-up effect. Second method is to analyze heat balance of the engine during warm-up phase under steady engine operation so that wasted energy by losses such as cooling and exhaust can be index of warm-up effect. This study focused on evaluation of warming-up effect by both methodology above mentioned using 2L SI engine under from idle to 2000rpm steady condition. Results, idle operation showed low heat recovery efficiency but under higher engine speed condition, remarkable heat recovery efficiency improvement was observed. In 2000rpm steady condition, warm-up duration of engine is decreased by exhaust heat recovery system.

Design of Stable Controller to Sudden A/C Disturbance (급격한 에어콘 외란에 안정한 제어기 설계)

  • 이영춘;권대규;이성철
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.7
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    • pp.106-112
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    • 2000
  • The purpose of this paper is to study on the control of the engine idle speed under sudden A/C load which is one of the most severe disturbances on engines. Three types of the closed-loop controller are developed for the stable engine idle speed control. The input of the controller is an error of rpm. The output of the controller is an ISCV duty cycle. The anticipation delay is considered to deal with the delay time of the air mass in engine. The PID, Fuzzy and PID-type Fuzzy controllers with the anticipation delay have improved the engine idle speed condition more than current ECU map table under the A/C load.

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A Study on the Idle Speed Control under Load Disturbance (부하변동에 강인한 엔진 공회전 속도제어에 관한 연구)

  • 최후락;장광수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.5
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    • pp.37-50
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    • 1997
  • The objective of this paper is to study on the idle speed control using the fuzzy logic controller under load disturbance. The design procedure for fuzzy logic controller depends on the expert's knowledge or trial and error. The inputs of the fuzzy controller are error of rpm and variation of rpm. The output of the fuzzy controller is an ISC motor step and ignition timing. The airflow is controlled by the ISC motor movement and the idle speed is controlled by the airflow control and ignition timing control. During the control, air to fuel was checked by LAMBDA sensor. All experiments were performed in a real vehicle.

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Idle Quality Optimization Study (공회전시 차량의 소음진동현상의 질적개선에 대한 고찰)

  • ;Norbert Wiehagen
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.05a
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    • pp.342-352
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    • 2003
  • Idle NVH characteristics are one of the most important aspects among the vehicle performances. Vehicle developers are devoted to improve vehicle interior noise and steering wheel and seat vibrations. In order to improve the idle quality, noise and vibration transfer path should be carefully evaluated. Also, effects of various components related to the idle performance should be confirmed. A general procedure for improving the idle qualify is described in detail. The relationship among cylinder pressure characteristics, crankshaft rotational speed variation, and vehicle vibrations is also investigated. Influences of drive shaft, torque converter, air conditioning system, vehicle structure including engine mount system, and idle control parameters on the vehicle idle quality are studied. Weak points of typical vehicles on the idle qualify are identified. Some of improvement measures are proposed and verified.

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Development of a Starting Time Prediction Model for a Small Gas Turbine Engine (소형가스터빈엔진 시동시간 예측모델 개발)

  • Jun, Yong-Min;Choi, Jong-Soo
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.985-987
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    • 2011
  • This paper includes a development of a starting time prediction model for a derivative engine. For this derivative engine design, a new map expansion method, Modified Pump Scaling Law(MPS), has been applied and expand the maps to sub-idle range. From loss characteristics of the reference engine, loss models for the derivative engine have been developed considering different pressure, temperature, and engine configurations. Starting time predictions of the derivative engine shows preferable results comparing test results.

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Study on the Expansion Technique of Compressor Characteristic Map to Sub-Idle Range (저속영역으로의 압축기 특성맵 확장기법 연구)

  • Jun, Yong-Min;Choi, Jong-Su
    • Journal of the Korean Society of Propulsion Engineers
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    • v.15 no.5
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    • pp.54-59
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    • 2011
  • Reliable starting capability of a gas turbine engine calls the engine industry's attention recently. So far the gas turbine engine performance researches have focused on the range between idle to Max rpm, but recent attention on the starting has brought interests in the range of "Sub-dile". As component characteristic maps are essential for the starting research, various kinds of studies have been doing and proposing ways to expand the existing maps toward sub-idle range. In this paper, previous studies were discussed and a new method suggested and validated.