Drive control apparatus for providing drive control to a hybrid electric vehicle, and hybrid electric vehicle

A drive control apparatus for a hybrid electric vehicle, including an engine, a device for restricting the direction of revolution of an engine output shaft of said engine, a drive shaft connected to a traction wheel, a first motor generator, a second motor generator, and a power split and composition device with four rotary elements coupled to said first motor generator, second motor generator, drive shaft and engine, respectively, the drive control apparatus comprising:

• a driving torque target setting arrangement configured to set a driving torque target;
• and
• a motor generator control arrangement configured to control operation of the first motor generator and second motor generator in response to said driving torque target,
• said motor generator control arrangement including:
• a motor generator first sharing ratio setting arrangement configured to set a motor generator first sharing ratio in response to said driving torque target in motor generator drive mode in which, with said engine halted, one of said first and second motor generators is primarily used as a source of drive, and;
• a motor generator drive mode control arrangement configured to put both of said first and second motor generators into operation by controlling operation of the other of said first and second motor generators in response to said motor generator first sharing ratio under a predetermined operating condition, in which vehicle vibrations may take place, during driving in said motor generator drive mode.