Continuously variable transmission and power on/off determination method
AssigneeJATCO Ltd
InventorsHiroyasu TANAKA, Masahide Ito, Masato Mori, Takashi Eguchi, Ryousuke Nonomura, Seiichiro Takahashi, Mamiko Inoue
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Abstract
In a manual mode, a gear position of a continuously variable transmission is selected based on an input operation from a driver, a final through speed ratio is set based on the selected gear position and a variator and a sub-transmission mechanism are controlled to realize the final through speed ratio. Whether an input torque to the sub-transmission mechanism is positive or negative is determined based on an input torque to the sub-transmission mechanism when the manual mode is selected.
Claims9
A continuously variable transmission mounted in a vehicle to shift and transmit output rotation of a driving source, comprising:
- a variator which changes a speed ratio continuously;
- a stepped sub-transmission mechanism provided in series with the variator;
- a transmission control unit which selects either one of an auto mode in which a final through speed ratio as a target value of an overall speed ratio of the variator and the sub-transmission mechanism is set based on a driving condition of the vehicle and the variator and the sub-transmission mechanism are controlled to realize the final through speed ratio or a manual mode in which a gear position of the continuously variable transmission is selected based on an input operation from a driver, the final through speed ratio is set based on the selected gear position and the variator and the sub-transmission mechanism are controlled to realize the final through speed ratio;
- and
- a power ON/OFF determination unit which determines whether an input torque to the sub-transmission mechanism is positive or negative based on the input torque to the sub-transmission mechanism when the manual mode is selected.
A power ON/OFF determination method for determining whether an input torque to a stepped sub-transmission mechanism is positive or negative in a continuously variable transmission including a variator which changes a speed ratio continuously and the sub-transmission mechanism provided in series with the variator and mounted in a vehicle to shift and transmit output rotation of a driving source, comprising:
- selecting either one of an auto mode in which a final through speed ratio as a target value of an overall speed ratio of the variator and the sub-transmission mechanism is set based on a driving condition of the vehicle and the variator and the sub-transmission mechanism are controlled to realize the final through speed ratio or a manual mode in which a gear position of the continuously variable transmission is selected based on an input operation from a driver, the final through speed ratio is set based on the selected gear position and the variator and the sub-transmission mechanism are controlled to realize the final through speed ratio;
- and
- determining whether the input torque to the sub-transmission mechanism is positive or negative based on the input torque to the sub-transmission mechanism when the manual mode is selected.
A continuously variable transmission mounted in a vehicle to shift and transmit output rotation of a driving source, comprising:
- a variator which changes a speed ratio continuously;
- a stepped sub-transmission mechanism provided in series with the variator;
- transmission control means for selecting either one of an auto mode in which a final through speed ratio as a target value of an overall speed ratio of the variator and the sub-transmission mechanism is set based on a driving condition of the vehicle and the variator and the sub-transmission mechanism are controlled to realize the final through speed ratio or a manual mode in which a gear position of the continuously variable transmission is selected based on an input operation from a driver, the final through speed ratio is set based on the selected gear position and the variator and the sub-transmission mechanism are controlled to realize the final through speed ratio;
- and
- power ON/OFF determination means for determining whether an input torque to the sub-transmission mechanism is positive or negative based on the input torque to the sub-transmission mechanism when the manual mode is selected.
Dependencies are inferred from the claim text.