Speed change control apparatus of automatic transmission
AssigneeJATCO Ltd
InventorNaonori Iizuka
Life of this patent
Estimating the term…
Abstract
When a speed ratio is selected manually by an operator of a vehicle, an upshift command is generated if the engine speed exceeds a predetermined maximum value. Further manual upshifts and downshifts are inhibited for a predetermined time period. The time period is a function of at least one of the current engaged gear ratio, engine throttle position, and the amount of time it takes to upshift the transmission.
Claims3
A speed change control apparatus of an automatic transmission capable of selecting between automatic speed change means for setting a speed change stage automatically in accordance with a running condition and manual speed change means for setting a speed change stage selected by manual manipulation, comprising:
- shift control means for shifting to a speed change stage set by the automatic speed change means or the manual speed change means;
- engine speed detecting means for detecting an engine speed;
- overspeed suppressing means for sending an up-shift command to the shift control means when an engine speed detection value of the engine speed detecting means exceeds a preset overspeed;
- and
- shift inhibiting means for inhibiting shift of the shift control means at least by the manual speed change means until a predetermined time elapses from the sending of the up-shift command by the overspeed control means.
Dependencies are inferred from the claim text.