Continuously variable transmission control device and control method
AssigneeJATCO Ltd
InventorsKen Okahara, Atsushi Shimada
Life of this patent
Estimating the term…
Abstract
A continuously variable transmission has a variator (4) structured to be able to continuously vary a transmission ratio and a control unit (100). The control unit (100) continuously varies a transmission ratio of the variator (4) in a continuously variable shift mode. In a manual mode in which a manual mode switch (36c) is ON, the transmission ratio is maintained. When a shift switch (36a, 36b) is operated by a driver during the manual mode, the control unit (100) performs shift of the variator (4) so as to change an input rotation speed of the variator (4) by a predetermined rotation speed (ΔN1) regardless of a vehicle speed.
Claims5
A control device of a continuously variable transmission comprising:
- a continuously variable shift mode configured to, according to a travelling state, continuously vary a transmission ratio of a variator that is provided between a driving source and driving wheels and structured to be able to continuously vary a transmission ratio defined by a ratio between an input rotation speed according to a rotation speed of the driving source and an output rotation speed according to a rotation speed of the driving wheels;
- a manual mode configured to, according to driver's operation, shift so as to change the input rotation speed by a predetermined rotation speed regardless of a vehicle speed;
- and
- a switch configured to command the continuously variable transmission to perform an up-shift or a down-shift during the manual mode,
- wherein when a time of an operation of the switch is shorter than a predetermined time, the control device is configured to judge the switch operation to be a click operation and perform the shift of the variator so as to change the input rotation speed by the predetermined rotation speed according to the click operation.
A method of controlling a continuously variable transmission, the continuously variable transmission having a variator that is provided between a driving source and driving wheels and structured to be able to continuously vary a transmission ratio defined by a ratio between an input rotation speed according to a rotation speed of the driving source and an output rotation speed according to a rotation speed of the driving wheels, the method comprising:
- when a continuously variable shift mode is selected by a driver, continuously varying a transmission ratio according to a travelling state;
- and
- when a manual mode is selected by the driver, maintaining the transmission ratio at a constant transmission ratio, and according to an operation of a shift switch, shifting so as to change the input rotation speed by a predetermined rotation speed regardless of a vehicle speed.
Dependencies are inferred from the claim text.