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 language | English |
|---|---|
| Pages (from-to) | 286-293 |
| Number of pages | 8 |
| Journal | KSME International Journal |
| Volume | 18 |
| Issue number | 2 |
| Publication status | Published - 2004 Feb 1 |
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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
Cite this
Sensitivity of hot film flow meter in four stroke gasoline engine. / Lee, Gangyoung; Myung, Cha Lee; Park, Simsoo; Cho, Youngjin.
In: KSME International Journal, Vol. 18, No. 2, 01.02.2004, p. 286-293.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Sensitivity of hot film flow meter in four stroke gasoline engine
AU - Lee, Gangyoung
AU - Myung, Cha Lee
AU - Park, Simsoo
AU - Cho, Youngjin
PY - 2004/2/1
Y1 - 2004/2/1
N2 - 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.
AB - 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.
KW - CVVT (Continuous Variable Valve Timing)
KW - Flow Oscillation
KW - HFM (Hot Film Flow Meter)
KW - Intake Air Duct
KW - MAP (Manifold Absolute Pressure)
KW - Reverse Flow
KW - USFM (Ultra Sonic Flow Meter)
UR - http://www.scopus.com/inward/record.url?scp=21844469965&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=21844469965&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:21844469965
VL - 18
SP - 286
EP - 293
JO - Journal of Mechanical Science and Technology
JF - Journal of Mechanical Science and Technology
SN - 1738-494X
IS - 2
ER -