Control device and control method for power train
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShinichi Sugai, Mitsuaki Higa
Life of this patent
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Abstract
In a power train in which a differential mechanism is coupled with a transmission mechanism, a transmission member is free with no engagement in a second shift portion when a P position or an N position is selected, and a ring gear thereby becomes free in a power split device. During an idle operation with such a shift position, a behavior of an engine rotation speed is retained in a stable manner in the power split device which functions as the differential mechanism through a power supply control (lock control) such that a rotor of a second MG coupled with the ring gear is locked by an electromagnetic force, and then, a learning control of an idle speed control is appropriately implemented.
Claims14
A control device for a power train provided with:
- a differential mechanism having a first rotating element coupled with a rotor of a first rotating electric machine, a second rotating element coupled with a rotor of a second rotating electric machine, and a third rotating element coupled with an output shaft of an engine;
- and
- a transmission mechanism coupled with said second rotating element and transmitting torque inputted from said second rotating element to a wheel,
- said control device comprising:
- an idle speed control portion for controlling an engine rotation speed when said engine is in an idle operation;
- a learning control portion for implementing a learning control in order to correct a set amount of engine control by said idle speed control portion based on an actual engine rotation speed during said idle operation;
- and
- a rotation lock control portion for controlling power supply to said second rotating electric machine so that rotation of the rotor of said second rotating electric machine is locked by an electromagnetic force generated in said second rotating electric machine when said learning control is implemented at a time of selection of a predetermined shift position in which said second rotating element is not engaged with another rotating element in said transmission mechanism.
A control method for a power train provided with:
- a differential mechanism having a first rotating element coupled with a rotor of a first rotating electric machine, a second rotating element coupled with a rotor of a second rotating electric machine, and a third rotating element coupled with an output shaft of an engine;
- and
- a transmission mechanism coupled with said second rotating element and transmitting torque inputted to said second rotating element to a wheel,
- the method comprising the steps of:
- determining whether or not a predetermined shift position in which said second rotating element is not engaged with another rotating element in said transmission mechanism is selected;
- and
- controlling power supply to said second rotating electric machine so that rotation of the rotor of said second rotating electric machine is locked by an electromagnetic force generated in said second rotating electric machine when a learning control to correct a set amount of an engine control by an idle speed control during an idle operation of said engine based on an actual engine rotation speed during said idle operation, when said predetermined shift position is selected.
Dependencies are inferred from the claim text.