Simulation method and device for aiding the design of a fluid torque converter

A device for designing a fluid torque converter by simulating properties of the fluid torque converter, comprising:

• a data input unit for accepting data on a vane profile of a vane wheel of a fluid torque converter;
• a simulation parameter computing unit for computing a plurality of parameters including a fluid passage angle and a fluid passage resistance according to data on said vane profile of said vane wheel supplied from said data input unit;
• a fluid passage angle correcting unit for computing a correction value as a function of a slip ratio which is given as a ratio of a pump rotational speed to a turbine rotational speed of said fluid torque converter, and correcting said fluid passage angle computed by said simulation parameter computing unit according to said correction value;
• a simulation unit for simulating properties of said fluid torque converter according to said various parameters given from said simulation parameter computing unit, said fluid passage angle corrected by said fluid passage angle correcting unit, and a relationship between input and output torque of said torque converter;
• and
• an evaluation unit for comparing a result of simulation supplied from said simulation unit with a combination of target property data and producibility data, wherein said producibility data is indicative of the suitability of said vane wheel for fabrication, and evaluating the feasibility of said vane profile.