Power transmission unit
AssigneesDenso Corporation, Nippon Soken, Inc.
InventorsTakenori Matsue, Koji Kawasaki, Masanori Sugiura
Life of this patent
Estimating the term…
Abstract
After an engine starts, a rotation speed of the engine is fed back to a target rotation speed that is defined in response to requested power for the engine. In addition, by operating a gear ratio of a CVT, a rotation speed of an output side of a one-way bearing is fed back to the target rotation speed.
Claims15
A power transmission unit having a plurality of power split rotors that rotate in conjunction with each other to split power among a rotary electric apparatus, an internal combustion engine, and drive wheels,
- the power split rotors including:
- a start rotor that supplies a start rotational force to the internal combustion engine;
- and
- a transmission rotor that is separate from the start rotor and mechanically coupled to the internal combustion engine,
- the power transmission unit comprising:
- a speed ratio varying device that makes variable a speed ratio, which is a ratio of a rotation speed of the drive wheels relative to a rotation speed of the transmission rotor;
- a start power transmission regulating device that switches transmission and interruption of power from the start rotor to the internal combustion engine;
- a transmission power transmission regulating device that switches transmission and interruption of power from the internal combustion engine to the transmission rotor;
- and
- a controller configured to:
- set a target rotation speed of the internal combustion engine on a basis of requested power for the internal combustion engine when a start request of the internal combustion engine arises;
- control a rotation speed of the internal combustion engine to the target rotation speed so as to output power of the internal combustion engine to the transmission power transmission regulating device after start of combustion control of the internal combustion engine, and
- control, by operating the speed ratio varying device, an output side of the transmission power transmission regulating device to a rotation speed of an input side of the transmission power transmission regulating device at a time when the rotation speed of the internal combustion engine becomes the target rotation speed, the output side of the transmission power transmission regulating device being coupled with the transmission rotor.
A power transmission unit having a plurality of power split rotors that rotate in conjunction with each other to split power among a rotary electric apparatus, an internal combustion engine, and drive wheels,
- the power split rotors including:
- a start rotor that supplies a start rotational force to the internal combustion engine;
- and
- a transmission rotor separate from the start rotor and mechanically coupled to the internal combustion engine,
- the power transmission unit comprising:
- a speed ratio varying device that varies a speed ratio, which is a ratio of a rotation speed of the drive wheels relative to a rotation speed of the transmission rotor;
- a start power transmission regulating device that switches transmission and interception of power from the start rotor to the internal combustion engine;
- and
- a transmission power transmission regulating device that switches transmission and interception of power from the internal combustion engine to the transmission rotor,
- wherein a low start setting is provided such that when a ratio of a rotation speed of the drive wheels relative to a rotation speed of the transmission rotor is lowered by increasing the rotation speed of the transmission rotor using the speed ratio varying device, a rotation speed of the start rotor increases.
Dependencies are inferred from the claim text.