Patent ID: 7650956

Claim:
A vehicle drive control apparatus for a wheeled vehicle including a first motor generator and a second motor generator, the vehicle drive control apparatus comprising: a planetary gear set including a first rotating element drivingly connected to the first motor generator, a second rotating element drivingly connected to the second motor generator, and a third rotating element drivingly connected to a drive wheel of the vehicle; a rotation control mechanism selectively restricting rotation of one of the first and second rotating elements of the planetary gear set to establish a fixed speed ratio mode, and releasing the one of the first and second rotating elements to establish a variable speed ratio mode; a wheel slip detector configured to detect a slip state of the drive wheel with respect to a road surface; and a control unit configured to control each operating state of the rotation control mechanism, the first motor generator, and the second motor generator, the control unit being configured to establish the variable speed ratio mode when the slip state of the drive wheel is detected in the fixed speed ratio mode, wherein the vehicle includes an engine, wherein the planetary gear set includes a fourth rotating element drivingly connected to the engine, wherein a speed ratio of the third rotating element of the planetary gear set to the fourth rotating element of the planetary gear set is fixed in the fixed speed ratio mode, and wherein the speed ratio is allowed to vary in the variable speed ratio mode.