Shift control system for automatic transmission
AssigneeJatco Transtechnology Ltd.
InventorsToshiji Iida, Tateki Jouzaki, Tatsuo Ochiai, Naoya Inoue, Akira Hino
Life of this patent
Estimating the term…
Abstract
A shift control system for an automatic transmission which has a gear ratio control means for controlling gear ratio of the automatic transmission comprises a lower limit setting device provided in said gear ratio control means and setting a lower limit for inhibiting a gear ratio from changing to a gear ratio of an upshift side; and a lower limit variable control means in which a lower limit of said gear ratio can be changed to a downshift side or to an upshift side by an operation of a driver.
Claims9
A shift control system for an automatic transmission which has a gear ratio control means for controlling gear ratio of said automatic transmission by determining a target gear ratio value from a drive point determined on the basis of at least a throttle opening and a vehicle speed, comprising:
- a lower limit setting device provided in said gear ratio control means and setting a lower limit for inhibiting a gear ratio from changing to a gear ratio of an upshift side;
- and
- a lower limit variable control means in which a lower limit of said gear ratio can be changed to a downshift side or to an upshift side by an operation of a driver.
Dependencies are inferred from the claim text.