Patent ID: 7343273

Claim:
A computer readable medium encoded with a computer program for supporting design of a piston shape of an engine, said program being executed by a computer to perform: inputting specification values defining a crown type and shape of a piston; reading out an intake-side piston model having an intake-side recess, and an intake valve model from a database, which stores a plurality of intake-side piston models and a plurality of exhaust-side piston models, independently, in accordance with crown types of the piston; deforming the intake-side piston model using the specification values input in the inputting, so as to prevent interference between the intake-side recess and the intake valve model; further reading out an exhaust-side piston model having an exhaust-side recess, and an exhaust valve model from the database; further deforming the exhaust-side piston model using the specification values input in the inputting, so as to prevent interference between the exhaust-side recess and the exhaust valve model; and combining the deformed intake-side piston model and the deformed exhaust-side piston model.