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International Journal of Automotive Technology 2002;3(2): 57-61. |
| ESTIMATION TECHNIQUE OF AIR CONTENT IN AUTOMATIC TRANSMISSION FLUID BY MEASURING EFFECTIVE BULK MODULUS |
| Baek-Hyun Cho, Hyoun-Woo Lee, Jong-Sun Oh |
| Hyundai Motors |
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| ABSTRACT |
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It is well known that the entrained air in oil causes appreciable reduction in the stiffness of hydraulic systems. It make the response delay of the systems and sometimes destroys the stability. Because the hydraulic systems of automatic transmissions are operated in relavtively low pressure and high temperature, it is very important to analyze the effects of the air included in automatic transmission fluid. However, it is difficult to derive the generalized model to describe the effective bulk modulus theoretically or measure it in actual operating conditions of automatic transmissions. This paper reviews previous studies of the air effects in hydrulic systems and the measurement techniques of the effective bulk modulus in operating conditions. Based on this work, the theoretical model with moderate complexity and the measurement technique of the effective bulk modulus considering entrained air effect at real operating conditions are suggested. Our paper also shows that the quantity of the entrained air in the automatic transmission fluid can be estimated from the experimental results. |
| Key Words:
Hydraulic system, Bulk modulus, Automatic transmission fluid |
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