• Title/Summary/Keyword: Wide-Band Oxygen Sensor

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Robust Nonlinear Control of Air-to-Fuel Ratio in Spark Ignition Engines

  • Myoungho Sunwoo;Paljoo Yoon;Park, Seungbum;Lee, Wootaik
    • Journal of Mechanical Science and Technology
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    • v.15 no.6
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    • pp.699-708
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    • 2001
  • This paper presents a new approach to the AFR (Air-to-Fuel Ratio) control problem, which is based on the wide-band oxygen sensor output. The dedicated nonlinear controller is based on the feedback lineaization technique. It is well known that the feedback linearizing control technique requires an exact model of the plant for the cancellation of plant nonlinearities. A sliding mode control scheme is applied which can effectively compensate the modeling uncertainties. The measurement time delay of an oxygen sensor limits the gain of the feedback controller. Hence, time delay compensation procedure is necessary for the improvement of control performance. The Smith predictor is adopted to compensate the effects of time delay. The simulation and experimental results show that the proposed controllers can effectively reduce the transient peaks of AFR in spite of fast tip-in and tip-out maneuvers of the throttle.

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Ultra Violet (UV) Sensor based on Oxide Ceramic Materials (산화물 세라믹 재료 기반 자외선 센서)

  • Yu, Hak Ki
    • Ceramist
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    • v.22 no.1
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    • pp.27-35
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    • 2019
  • Research on ultraviolet (UV) light detection has attracted considerable attention from scientific researchers in related fields. It can be said that it is a very important time to accurately monitor the UV irradiation amount according to the wavelength region in real time. The oxide is very diverse in its kind and has the advantage of being able to efficiently control the band gap through band gap engineering. In addition, it is very stable in response to heat and atmospheric oxygen when UV is absorbed. Also, there is a known method that can effectively manufacture oxide nanoparticles and nanorods through various synthesis methods, and researches for improving the sensitivity of UV sensors have been carried out using this method. In this paper, we introduce the materials that can be used as UV sensors among various wide band oxide materials, and review the results of researches of various UV sensors using nano materials.