Taking planetary gear mechanism size and transmission efficiency of AT as optimization targets

the mathemat ical model and constraint equations of objective optimization are established with the Lever

according to the automat ic transmission practical work requirements.In order to verify the feasibility of optimization calculation

taking a domestically automatic transmission as model

the inequality constraint function is changed into a non-constrained penalty function by using point outside the penalty function method.The optimization procedure is developed based on the VB system software

and satisfactory optimization result is obtained.