Vehicular drive system

A control device for a vehicular drive system arranged to transmit an output of an engine to a drive wheel of a vehicle, comprising:

• a transmission mechanism of switchable type switchable between a continuously-variable shifting state in which the transmission mechanism is operable as an electrically controlled continuously variable transmission, and a fixed-speed-ratio shifting state;
• a control map which defines, with control parameters consisting of a running speed of the vehicle and a load of the vehicle or an output torque of the vehicular drive system, a first region in which said transmission mechanism of switchable type is placed in said continuously-variable shifting state, and a second region in which the transmission mechanism is placed in said fixed-speed-ratio shifting state;
• and
• switching control means for placing said transmission mechanism of switchable type selectively in one of said continuously-variable shifting state and said fixed-speed-ratio shifting state, according to said control map.

A control device for a vehicular drive system arranged to transmit an output of an engine to a drive wheel of a vehicle, comprising:

• a transmission mechanism of switchable type switchable between a continuously-variable shifting state in which the transmission mechanism is operable as an electrically controlled continuously variable transmission, and a step-variable shifting state;
• a control map which defines, with control parameters consisting of a running speed of the vehicle and a load of the vehicle or an output torque of the vehicular drive system, a first region in which said transmission mechanism of switchable type is placed in said continuously-variable shifting state, and a second region in which the transmission mechanism is placed in said step-variable shifting state;
• and
• switching control means for placing said transmission mechanism of switchable type selectively in one of said continuously-variable shifting state and said step-variable shifting state, according to said control map.

A control device for a vehicular drive system including a continuously-variable shifting portion which functions as a continuously variable transmission and which has a differential mechanism operable to distribute an output of an engine to a first electric motor and a power transmitting member, and a second electric motor disposed in a power transmitting path between the power transmitting member and a drive wheel of a vehicle, said vehicular drive system further including a step-variable shifting portion which constitutes a part of said power transmitting path and which functions as a step-variable automatic transmission, comprising:

• a differential-state switching device provided in said differential mechanism and operable to place said continuously-variable shifting portion selectively in a differential state in which the differential mechanism is operable as an electrically controlled continuously variable transmission, and a locked state in which the differential mechanism is in a non-differential state;
• a first control map which defines, with predetermined control parameters, shifting lines for effecting a shifting control of said step-variable automatic transmission;
• and
• a second control map which defines, with the same control parameters as used for said first control map, a differential region in which said differential mechanism is placed in said differential state by said differential-state switching device, and a non-differential state in which the differential mechanism is placed in said non-differential state by said differential-state switching device.

A control device for a vehicular drive system including a differential mechanism operable to distribute an output of an engine to a first electric motor and a power transmitting member, and a second electric motor disposed in a power transmitting path between the power transmitting member and a drive wheel of a vehicle, comprising:

• a differential-state switching device operable to place said differential mechanism selectively in a differential state in which the differential mechanism is operable as an electrically controlled continuously variable transmission, and a locked state in which the differential mechanism is in a non-differential state;
• a first control map which defines, with predetermined control parameters, a plurality of regions for effecting a drive-power-source selection control to select at least one drive power source to be operated to generate a drive force, from among said engine, said first electric motor and said second electric motor;
• and
• a second control map which defines, with the same control parameters used for said first control map, a differential region in which the differential mechanism is placed in said differential state by said differential-state switching device, and a non-differential region in which the differential mechanism is placed in said non-differential state by said differential-state switching device.

A control device for a vehicular drive system including a differential mechanism operable to distribute an output of an engine to a first electric motor and a power transmitting member, and a second electric motor disposed in a power transmitting path between the power transmitting member and a drive wheel of a vehicle, comprising:

• a differential-state switching device operable to place said differential mechanism selectively in a differential state in which the differential mechanism is operable as an electrically controlled continuously variable transmission, and a step-variable shifting state in which the differential mechanism is operable as a step-variable transmission;
• a first control map which defines, with predetermined control parameters, a plurality of regions for effecting a drive-power-source selection control to select at least one drive power source to be operated to generate a drive force, from among said engine, said first electric motor and said second electric motor;
• and
• a second control map which defines, with the same control parameters used for said first control map, a differential region in which the differential mechanism is placed in said differential state by said differential-state switching device, and a non-differential region in which the differential mechanism is placed in said non-differential state by said differential-state switching device.