Control apparatus for hybrid drive system

A control apparatus for a hybrid drive system including a main drive power source, an electric generator, a wheel-side output shaft, an automatic transmission, a power distributing mechanism having an input element connected to the main drive power source in a drive-power transmissive state, a reaction element connected to the electric generator in the drive-power transmissive state and an output element connected to the wheel-side output shaft in the drive-power transmissive state, a control unit of the control apparatus controlling an operating state of the electric generator so as to control a differential state between each rotational speed of the input element, the reaction element and the output element, and an electric motor connected to the wheel-side output shaft through the automatic transmission, the control unit controlling a shifting action of the automatic so as to raise or lower a rotational speed of the electric motor and transmit a rotation of the electric motor to the wheel-side output shaft, the hybrid drive system utilizing a differential function of the power distributing mechanism so that one portion of an output of a drive force of the main drive power source is mechanically transmitted to the wheel-side output shaft, while another portion of the output of the drive force of the main drive power source is converted into an electric energy by the electric generator and transmitted from the electric generator to the electric motor, the control apparatus comprising:

• motor-output limitation control means for implementing an output limitation of said electric motor according to a requirement for the output limitation;
• and
• motor-output increasing means for controlling said electric motor to increase its output so as to offset the output limitation of the electric motor implemented by said motor-output limitation control means according to a requirement for said output limitation during a shift-up action of said automatic transmission.