Yorishige Maeda

Investigation of the Transient Oil Consumption of Engine by the Newly Developed Oil Consumption Meter

A new method of continuous measurement of engine oil consumption using sulfur as the tracer has been developed. The modified non-dispersive-infrared (NDIR) analyzer with the SO/sub 2/ absorbent and a permeable plastic type dryer enable to measure very low concentration of SO/sub 2/ in the exhaust gas. By the use of this method, the engine oil consumption under the transient engine operating condition has been analyzed. The experimental result show that the measured value of the transient oil consumption is larger than the estimated value by the quasi-steady method using the experimental data of steady-state operations. The difference between these value is explained by the simple model developed here. This model also show that the total oil consumption under the transient engine operating condition depends mainly on the amount of oil drawn into the combustion chamber by the high vacuum during engine-brake conditions.

Development of computer aided engineering for piston design

Computer Aided Engineering system for automotive piston design was developed which can predict total piston performance in a short time at the planning stage of piston design. The purpose of this CAE system is to provide a tool for a designer to predict total piston performance easily and rapidly without experimental data. This system has two characteristics. Firstly, new finite element methods were developed which can predict temperature distribution without experimental data, thermal skirt expansion for a strutted piston and skirt-to-bore contact pressure under engine operating conditions. Secondly, the automatic mesh generating software was developed which creates three-dimensional piston modeling in less than 30 minutes.