Shift control device for hybrid vehicle

摘要

A shift control device includes a controller (10) and a differential mechanism (2) including four rotating elements. Each of the elements is connected to an engine, two motor/generators and an output. The controller (10) is programmed to calculate a target driving power (Po<*>); make a judgment as to whether the target driving power (Po<*>) is less than or equal to a driving power (Po gamma ) wherein the engine is driven under optimum fuel efficiency; when the judgment shows that the target driving power (Po<*>) is larger than the driving power, calculate an engine's speed (Ne gamma ) and torque (Te gamma ) wherein the target driving power (Po<*>) is realized such that the engine is driven for maximum load; and control the engine under the engine's speed (Ne gamma ) and torque (Te gamma ). Consequently, if the target driving power (Po<*>) is above what the engine alone can provide under optimum fuel efficiency, it is possible to provide the target power (Po<*>) without consuming an electric power of a battery. A shift control device includes a controller (10) and a differential mechanism (2) including four rotating elements. Each of the elements is connected to an engine, two motor/generators and an output. The controller (10) is programmed to calculate a target driving power (Po<*>); make a judgment as to whether the target driving power (Po<*>) is less than or equal to a driving power (Po gamma ) wherein the engine is driven under optimum fuel efficiency; when the judgment shows that the target driving power (Po<*>) is larger than the driving power, calculate an engine's speed (Ne gamma ) and torque (Te gamma ) wherein the target driving power (Po<*>) is realized such that the engine is driven for maximum load; and control the engine under the engine's speed (Ne gamma ) and torque (Te gamma ). Consequently, if the target driving power (Po<*>) is above what the engine alone can provide under optimum fuel efficiency, it is possible to provide the target power (Po<*>) without consuming an electric power of a battery.