Patent ID: 7097586

Claim:
A shift control apparatus for a hybrid transmission, comprising: a plurality of revolutional members which are enabled to be arranged on a predetermined lever diagram; a differential unit having two degrees of freedom such that if revolution states of two revolutional members of the plurality of revolutional members are determined, the revolutional states of the other revolutional members of the plurality of revolutional members are determined, an input of a main power source (ENG), an output to a drive system, and a plurality of motor/generators (MG 1 , MG 2 ) are coupled to the respective revolutional members of the differential unit to adjust a power from the motor/generators in such a manner that a shift ratio between the main power source and the drive system is varied continuously; a target drive torque calculating section that calculates a target drive torque (T* oO ) to the drive system in accordance with a driving condition; a target input revolution speed calculating section that calculates a target input revolution speed (ω* E ) of one of the revolutional members which is coupled to the main power source (ENG); a target input revolution acceleration calculating section that calculates a target input revolution acceleration (u io ) to converge an actual input revolution (ωi) into the target input revolution speed (ω*i); and a target value correcting section that corrects at least one of the target drive torque (T*hd oO) and the target input revolution (u io ) to be a value within a realizable region to be set as a drive torque command value (T* oO ) and an input revolution acceleration command value (u io ) in such a manner that polarities of the target drive torque (T* oO ) and the target input revolution acceleration (u io ) are left unchanged, wherein in a case where a combination of the target drive torque with the target input revolution acceleration falls out of a realizable region on two-dimensional coordinates of the drive torque and the input revolution acceleration related to a combination of the drive torque and the input revolution acceleration which is feasible in a state of the present motor/generators, a battery for the motor/generators (MG 1 , MG 2 ), and the main power source, the target value correcting section is configured to make the drive torque command value (T*o) and the input revolution acceleration command value (u i ) contribute to controls of the main power source and the motor/generators (3) in place of the target drive torque (T* oO ) and the target input revolution acceleration (u io ).