Shift control apparatus for automatic transmission
AssigneeJATCO Ltd
InventorYuji Saito
Life of this patent
Estimating the term…
Abstract
If, in a gear shift from one-way clutch involved gear speed to another gear speed, the inertia phase control time) is less than a predetermined time length, or the effective gear ratio on the inertia phase end detection instant is out of a range between before-shift gear ratio and after-shift gear ratio, a transmission control system controls the operating fluid pressure in a time management mode to prevent a shift shock by increasing the fluid pressure) at a gradual rate ΔPC1 during a longer time interval TMC1 after an end of the inertia phase.
Claims15
A shift control apparatus for an automatic transmission, the shift control apparatus comprising a shift controller configured:
- to control a one-way clutch shift operation from a first gear ratio at which a one-way clutch is involved as a reaction receiving element for torque transmission, to a second gear ratio, normally in a normal mode;
- and
- to control the one-way clutch shift operation from the first gear ratio to the second gear ratio in a time management mode if an effective gear ratio between a transmission input speed and a transmission output speed is out of a range between the first and second gear ratios.
A shift control apparatus for an automatic transmission, the shift control apparatus comprising a shift controller configured:
- to control a one-way clutch shift operation from a first gear ratio at which a one-way clutch is involved as a reaction receiving element for torque transmission, to a second gear ratio, normally in a normal mode;
- and
- to control the one-way clutch shift operation from the first gear ratio to the second gear ratio in a time management mode if a time duration from a start of a gear shift from the first gear ratio to the second gear ratio, to an end of an inertia phase distinguished by an effective gear ratio between a transmission input speed and a transmission output speed is smaller than a predetermined value.
A shift control system for a vehicle, comprising:
- an automatic transmission;
- and
- a shift controller to govern a one-way clutch gear shift from a first gear ratio at which a one-way clutch is involved as a reaction receiving element for torque transmission, to a second gear ratio;
- to produce a special condition signal when a special condition is detected in an inertia phase in the one-way clutch shift operation;
- and
- to control a one-way clutch shift operation to effect the one-way clutch gear shift from the first gear ratio to the second gear ratio in a normal mode if the special condition signal is absent, and in a time management mode if the special condition signal is present.
A shift control process for an automatic transmission for a vehicle, comprising:
- a step of monitoring a condition of an inertia phase in a one-way clutch gear shift from a first gear ratio at which a one-way clutch is involved as a reaction receiving element for torque transmission, to a second gear ratio;
- a step of producing an special condition signal if the condition of the inertia phase is in a predetermined state for special condition judgment;
- and
- to control a one-way clutch shift operation to effect the one-way clutch gear shift from the first gear ratio to the second gear ratio in a normal mode if the special condition signal is absent, and in a time management mode if the special condition signal is present.
Dependencies are inferred from the claim text.