Control device for vehicular drive system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsAtsushi Tabata, Yutaka Taga
Life of this patent
Estimating the term…
Abstract
A vehicular transmission mechanism, switchable between a continuously-variable shifting state and a step-variable shifting state, and a control device for controlling an operation of switching of the shifting state of the transmission mechanism so as to reduce its switching shock and improve the durability of coupling devices. The transmission mechanism 10 is switchable between the electrically established continuously-variable shifting state and the step-variable shifting state, by selective releasing and engaging actions of a switching clutch and brake.
Claims49
A control device for a vehicular drive system which is arranged to transmit an output of an engine to a drive wheel of a vehicle and which comprises a switchable transmission mechanism including a power distributing mechanism which has a first element fixed to said engine, a second element fixed to a first electric motor, and a third element fixed to a second electric motor and a power transmitting member, and a coupling device operable to connect any two of said first through third elements to each other and/or fix said second element to a stationary member, said switchable transmission mechanism being switchable between a continuously-variable shifting state in which the switchable transmission mechanism is operable as an electrically controlled continuously variable transmission, and a step-variable shifting state in which the switchable transmission mechanism is operable as a step-variable transmission, said control device comprising:
- switching control means for selectively releasing and engaging said coupling device, on the basis of a condition of the vehicle, to place said switchable transmission mechanism selectively in one of said continuously-variable shifting state and said step-variable shifting state;
- and
- electric motor control means for controlling said first electric motor so as to generate a reaction torque upon releasing of said coupling device, and/or so as to reduce speed differences among said first element, said second element and said third element or a speed difference between said second element and said stationary member, upon engaging of said coupling device.
A control device for a vehicular drive system including a differential portion which is operable as an electrically controlled differential device and which includes a differential mechanism operable to distribute an output of an engine to a first electric motor and a power transmitting member and having a plurality of rotary elements, and a second electric motor disposed in a power transmitting path between said power transmitting member and a drive wheel of a vehicle,
- said differential mechanism including a coupling device operable to switch said differential portion between a differential state in
- which said differential portion is operable as the electrically controlled differential device and is capable of performing a differential function, and a locked state in which said differential portion is not capable of performing said differential function, said control device comprising:
- switching control means for selectively releasing and engaging said coupling device, on the basis of a condition of the vehicle, to place said differential portion selectively in one of said differential state and said locked state;
- and
- electric motor control means for controlling said first electric motor so as to generate a reaction torque upon releasing of said coupling device, and/or so as to reduce speed differences among said plurality of rotary elements or a speed difference between one of said plurality of rotary elements to which said first electric motor is fixed, and a stationary member, upon engaging of said coupling device.
A control device for a vehicular drive system including a differential portion which is operable as an electrically controlled differential device and which includes a differential mechanism operable to distribute an output of an engine to a first electric motor and a power transmitting member and having a plurality of rotary elements, and a second electric motor connected with the power transmitting member in a power transmittable manner, the differential mechanism including a coupling device operable to switch the differential portion between a differential state in which the differential portion is operable as the electrically controlled differential device and is capable of performing a differential function, and a locked state in which the differential portion is not capable of performing the differential function, the control device comprising:
- switching control means for selectively releasing and engaging the coupling device, on the basis of a condition of the vehicle, to place the differential portion selectively in one of the differential state and the locked state;
- and
- electric motor control means for controlling the first electric motor so as to generate a reaction torque upon releasing of the coupling device, and/or so as to reduce speed differences among the plurality of rotary elements or a speed difference between one of the plurality of rotary elements to which the first electric motor is fixed, and a stationary member, upon engaging of the coupling device.
Dependencies are inferred from the claim text.