Shift control device and method for hybrid vehicle

摘要

The present invention relates to a shift control device for a hybrid vehicle comprising: a differential mechanism (2) including at least four rotating elements (Ss,Rd,C,Rs,Sd) whose rotating states are determined by rotating states of two of the at least four rotating elements, wherein said rotating elements connect a driving source (Engine), two motor/generators (MG1,MG2) and an output (OUT); and a controller programmed to: calculate a target driving power (Po * ) based on a driving condition; calculate a driving source speed (Ne ³) and a driving source torque (Te ³) under optimum fuel efficiency wherein the target driving power (Po * ) is realized; calculate a first motor/generator torque (T1) and a second motor/generator torque (T2) based on the driving source speed (Ne ³), the driving source torque (Te ³), a current output speed (No) and the target driving power (Po * ); make a first judgment as to whether both the first motor/generator torque (T1) is larger than a first motor/generator maximum torque (T1 max ) and the second motor/generator torque (T2) is larger than a second motor/generator maximum torque (T2 max ); when the first judgment shows at least one of the first and second motor/generator torques (T1,T2) being larger than the respective first and second motor/generator maximum torques (T1 max ,T2 max ), decrease the first driving source speed (Ne ³) until both of the first and second motor/generator torques (T1,T2) are equal to or smaller than the first and second motor/generator maximum torques (T1 max ,T2 max ), and a corresponding shift control method for a hybrid vehicle.