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International Journal of Automotive Technology 2007;8(2): 219-224. |
| EFFECT OF THE DIFFERENTIAL PRESSURE BY THE BLOW-BY GAS FLOW ON THE PCV VALVE WITH A CRACK |
| S.-M. SONG, O.-H. KWON, Y.-W. LEE |
| Pukyong National University |
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| ABSTRACT |
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Recently, atmospheric contaminations has become worse due to the increased number of automobile. The PCV (Positive Crankcase Ventilation) valve acts as a flow control to allow re-combustion of blow-by gas by having it flow from a crankcase to an inlet manifold suction tube. Also, during the fabrication of the PCV valve, micro cracks may occur in the valve body and be extended under operation. The excessive stress distribution and crack initiation on the PCV valve body would bring an unstable blow-by gas flow rate control and would cause valve failure. The purpose of this study is to examine the crack affects on the stress and strain variations on the PCV valve according to the inlet and outlet manifold under differential pressures. From the results, we can explain the behavior of the crack extension for a safe condition of PCV valve. |
| Key Words:
PCV valve, Blow-by gas, Crack extension, Finite element analysis, Differential pressure, Stress and strain variation, Stress intensity factor |
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