Sensitivity of hot film flow meter in four stroke gasoline engine

Gangyoung Lee, Cha Lee Myung, Simsoo Park, Youngjin Cho

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    The air fuel ratios of current gasoline engines are almost controlled by several air flow meters. When CVVT (Continuous Variable Valve Timing) is applied to a gasoline engine for higher engine performance, the MAP (Manifold Absolute Pressure) sensor is difficult to follow the instantaneous air fuel ratio due to the valve timing effect. Therefore, a HFM (Hot Film Flow Meter) is widely used for measuring intake air flow in this case. However, the HFMs are incapable of indicating to reverse flow, the oscillation of intake air flow has an negative effect on the precision of the HFM. Consequently, the various duct configurations in front of the air flow sensor affect the precision of HFM sensitivity. This paper mainly focused on the analysis of the reverse flow, flow fluctuation in throttle upstream and the geometry of intake system which influence the HFM measurement.

    Original languageEnglish
    Pages (from-to)286-293
    Number of pages8
    JournalKSME International Journal
    Volume18
    Issue number2
    DOIs
    Publication statusPublished - 2004 Feb

    Keywords

    • CVVT (Continuous Variable Valve Timing)
    • Flow Oscillation
    • HFM (Hot Film Flow Meter)
    • Intake Air Duct
    • MAP (Manifold Absolute Pressure)
    • Reverse Flow
    • USFM (Ultra Sonic Flow Meter)

    ASJC Scopus subject areas

    • Mechanical Engineering

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