Hybrid vehicle drive system including controllable device between engine and electric motor and vehicle drive wheels, and apparatus for controlling the device depending upon selected operation mode of the system

A hybrid drive system for a motor vehicle, comprising:

• a drive power source consisting of an engine operated by combustion of a fuel, and an electric motor operated with an electric energy, at least one of said engine and said electric motor being operated for driving the motor vehicle in a plurality of running modes;
• an automatic transmission disposed between said drive power source and drive wheels of the motor vehicle;
• and
• a shift control device for controlling at least one controllable variable of said automatic transmission, which at least one controllable variable influences a shifting action of said automatic transmission,
• and wherein said shift control device comprises learning control means for effecting a learning control of said at least one controllable variable in different manners corresponding to said plurality of running modes of the motor vehicle.

A hybrid drive system for a motor vehicle having front and rear drive wheels, comprising:

• a drive power source consisting of an engine operated by combustion of a fuel, and an electric motor operated with an electric energy, at least one of said engine and said electric motor being operated for driving the motor vehicle in a plurality of running modes;
• a torque distributing mechanism disposed between said drive power source and said drive wheels of the motor vehicle, for distributing a drive torque produced by said drive power source to said front drive wheels and said rear drive wheels at a controllable distribution ratio;
• torque distribution ratio changing means for controlling said torque distributing mechanism to change said distribution ratio of said drive torque;
• and
• learning control means for effecting a learning control of a controllable variable of said torque distributing mechanism which influences said distribution ratio, when said distribution ratio is changed by said torque distribution ratio changing means,
• and wherein said learning control means effects said learning control of said controllable variable in different manners corresponding to said plurality of running modes of the motor vehicle.