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This paper describes Computer Aided Expert System for Designing transmission. Design knowledge is classified into 2 groups - “CLASS FRAME” showing the concept relative with subject of study and “INSTANCE FRAME” displaying some examples together with knowledges in the form of diagram defined on frame as image data. These data were hierarchically sorted out for problem reduction and very effective and easy to understand knowledge representation was achieved. Besides that, experimental knowledge was processed by either probability theory based on parameter of certainty factor determining the quantity of specified information by using predicate logic or fuzzy inference using membership function both of which, in turn, made it possible to obtain reasonable and still yet optimum answer. Expert tool of personal computer can be employed for this system, and external program such as gear specification calculation program or gear stress calculation program can be executed by any user.

Many problems have been encountered in attempting to clarify the behaviors of drivetrain components from the standpoint of the power loss. This paper describes the analytical and experimental research to develop a method of measuring the total power losses of transmission and axle whereby far more accurate test results can be obtained than by the conventional means with good repeatability. In this pursuit, the power loss of the drivetrain is divided into two groups, i.e. gear tooth friction loss and lubricant churning loss, with the resulting practical formulation which permits calculation of these two losses on a separate basis. Also covered are the results so far achieved by means of practical application of the above approach and concept in both bench and field testings aiming at improvement of fuel economy and prediction of the drivetrain lubricant temperatures in the field operation.