Patent ID: 7037237

Claim:
A car control unit for an automatic transmission having a plurality of gears and a plurality of synchronizers capable of transferring a torque from a drive power source to wheels via a clutch, an input shaft, and an output shaft, said car control unit carrying out shifting wherein a first torque transmission path from said input shaft to said output shaft, formed by a first connection between said gears and said synchronizers, is switchable to a second torque transmission path from said input shaft to said output shaft, formed by a second connection via at least one intermediate torque transmission path, formed by a third connection using one of said synchronizers having a smaller reduction ratio than that in the first connection, in a state that said clutch is engaged, further comprising: state discrimination means for detecting or inferring temperature, heat quantity, or abrasion loss of said synchronizers as a parameter, and synchronizer selecting means for selecting a synchronizer to form one of said at least one intermediate torque transmission paths according to said parameter detected or inferred by said state discrimination means.