Speed shift control and apparatus for control of automatic transmission
AssigneeAisin Aw Co., Ltd.
InventorsTakahiro Sekii, Yoshihisa Yamamoto, Masamichi Unoki, Tsutomu Mizutani
Life of this patent
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Abstract
During an upshift in a full-throttle state, the output of a shift command (Us1) from a control unit is followed by a delay in initiation of an actual shift, due to a delay in increase in oil pressure, a rise in the clutch torque load, etc. A shift initiation (Uj) is determined by comparing the input rotational speed (Ni) with the product of multiplication of the output rotational speed (vehicle speed) (No) by the pre-shift gear ratio. The shift point (Mp1) is learning-corrected based on the shift initiation-time engine rotational speed (NeI). Therefore, false learning is avoided even if the engine races during a shift.
Claims21
A control apparatus for speed shift control of an automatic transmission in which a speed shift is performed based on satisfaction of a predetermined speed shift condition, the control apparatus comprising:
- speed shift determining means for outputting a speed shift determination responsive to satisfaction of the predetermined speed shift condition;
- speed shift executing means for executing an actual speed shift based on the output speed shift determination;
- shift initiation-time engine rotational speed detecting means for determining a time at which the actual execution of the speed shift is initiated, and for detecting an engine rotational speed at the time of the initiation of the speed shift;
- and
- learning-correcting means for correcting the predetermined speed shift condition by comparing the engine rotational speed at the time of initiation of the speed shift with a target engine rotational speed.
A method for speed shift control of an automatic transmission in which a speed shift is performed responsive to satisfaction of a predetermined speed shift condition, the control method comprising:
- outputting a speed shift command responsive to satisfaction of the predetermined speed shift condition;
- executing an actual speed shift responsive to the speed shift command;
- determining a time at which actual execution of the speed shift is initiated;
- detecting an engine rotational speed at the determined time of the initiation of the speed shift;
- and
- correcting the predetermined speed shift condition by comparing the engine rotational speed at the time of initiation of the speed shift with a target engine rotational speed.
Dependencies are inferred from the claim text.