CONTROLLER OF VARIABLE DISPLACEMENT PUMP MOTOR TYPE TRANSMISSION

摘要

PPROBLEM TO BE SOLVED: To provide a controller of a variable displacement pump motor type transmission which improves the power transfer efficiency of a transmission at the maximum speed gear. PSOLUTION: The controller of the variable displacement pump motor type transmission is provided with: two differential mechanisms; two variable displacement pump motors; and a plurality of power trains for a speed change gear. The two differential mechanisms are connected to a power source in parallel, and the two variable displacement pump motors impart a reaction force torque or a drive torque. The plurality of power trains for the speed change gear are brought into a state where they can transfer power alternatively to an output member by a switching mechanism. A switching mechanism for a direct connection stage is provided which alternatively connects the reaction force element and the output element of the differential mechanism on the other side which is opposite to the side where the power train for the maximum speed gear with the minimum gear ratio is provided. A direct connection stage formation means (steps S4 to S7) is provided which connects the reaction force element and the output element of the differential mechanism on the other side when the power train for the maximum speed gear is brought into a state where it transfers power to the output member, and the number of revolutions of the reaction force element and the number of revolutions of the output element of the differential mechanism on the other side are synchronized with each other. PCOPYRIGHT: (C)2010,JPO&INPIT