Engine control system using a cylinder pressure sensor

Engine control system using a cylinder pressure sensor

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Individual cylinder combustion control systems using a cylinder pressure sensor have already been introduced to realise highly tolerant system to the variability of engine components, fuel quality and environmental conditions. The paper deals with such an application of a cylinder pressure sensor to air/fuel ratio control, which is to control air/fuel ratio to the lean limit of engine stability. To detect the engine stability limit, some statistical signal processing method was applied to the detected peak pressure crank angle position Θpmax. By using this method, this system needs only relative cylinder pressure value to detect Θpmax, hence a practical piezoelectric type washer transducer was good enough for this application.


    1. 1)
      • Hamai, K., Nakagawa, Y., Nakai, M.: `Analysis of the causes of unstable combustion in a spark ignited engine', 1982 Fall Meeting, October 1982, Western States Section/The Combustion Institute, 82–73.
    2. 2)
      • Ina, T., Obayashi, H., Shigematsu, T.: SAE Paper 860413, Lean limit A/F control system by using engine speed variation.
    3. 3)
      • J.D. Powell . (1983) Close loop control of spark advance using cylinder pressure, Application of control theory in the automotive industry.
    4. 4)
      • Hata, Y., Asano, M.: SAE Paper 860592, New trends in electronic engine control.
    5. 5)
      • Sawamoto, K., Nakajima, Y., Hidaka, T., Nemoto, T.: `A newly-developed cylinder pressure sensor as part of an individual cylinder knocking control system', Proceedings of IECON '86, 1986, p. 873–876.

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