HYBRID VEHICLE WITH POWER-SPLIT AND PARALLEL HYBRID TRANSMISSION AND METHOD OF CONTROLLING SAME

摘要

A hybrid vehicle has a powertrain that includes a transmission with a planetary gear set that has a first, a second, and a third member. An engine is connected for unitary rotation with the first member. A first final drive is operatively connectable with the carrier member and connected with the first axle. A first motor-generator is connected for unitary rotation with the third member. A second motor-generator is operatively connected for proportional rotation with one of the axles. A first clutch is selectively engageable to connect any two of the members for unitary rotation with one another. The planetary gear set provides an underdrive ratio of speed of the second member to speed of the engine when the sun gear member is stationary.

主权项

1. A hybrid vehicle having a first axle and a second axle and comprising:
an engine; a first motor-generator; a second motor-generator electrically connected to the first motor-generator through a power inverter and an energy storage device; wherein the second motor-generator is connected for proportional rotation with one of the axles; a transmission that includes:
a planetary gear set having a first member, a second member, and a third member, including a sun gear member, a ring gear member, and a carrier member that supports a plurality of pinion gears that mesh with the sun gear member and the ring gear member; wherein the engine is connected for unitary rotation with the first member of the planetary gear set; wherein the first motor-generator is connected for unitary rotation with the third member of the planetary gear set;a first final drive having a first member and a second member; wherein the first member of the first final drive is operatively connectable to rotate in unison with the second member of the planetary gear set, and the second member of the first final drive is driven by the first member of the first final drive and is connected for unitary rotation with the first axle;a first clutch selectively engageable to connect any two of the members of the planetary gear set for unitary rotation with one another; the planetary gear set providing an underdrive ratio of speed of the second member of the planetary gear set to speed of the engine when the first motor-generator is stationary and the first clutch is not engaged; and the hybrid vehicle having a first ratio of torque of the first axle to torque of the engine when the first clutch is not engaged, and the first motor-generator is powered to apply torque on the third member of the planetary gear set, and a second ratio of torque of the first axle to torque of the engine lower than the first ratio when the first clutch is engaged and neither of the first and the second motor-generators is powered, the hybrid vehicle being operable in a power-split operating mode when the first clutch is not engaged and in a parallel operating mode when the first clutch is engaged.