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Shift control apparatus for an automatic transmission
| Details |
Inventors: Nishida, Masaaki; Tsutsui, Hiroshi; Kojima, Kouichi; Teraoka, Yutaka; Ichikawa, Masatake; Funakoshi, Hidekazu;
Assignee: Aisin Aw Co., Ltd. (Aichi-ken, JP)
Primary Examiner: Pang; Roger
Assistant Examiner:
Attorney, Agent or Firm: Sughrue Mion, PLLC
A shift control apparatus has first, second, third and fourth engagement elements, and a shift control processing unit engaging the first and the second engagement elements in order to realize a first shift speed, engaging the third and the fourth engagement in order to realize a second shift speed, and inhibiting an increase in torque capacity of one of the first and second engagement elements before starting of release of the second engagement element when shifting from the first to the second shift speed. During shifting from the first to the second shift speed, an increase in torque capacity of one of the first and second engagement elements is inhibited before starting of release of the second engagement element. This prevents a step-like shift shock from being caused by the slowed progression of shifting when release of the second engagement element is started. |
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DETAILED DESCRIPTION It is an object of the present invention to solve the problems associated with the conventional automatic transmissions as described above, and to provide a shift control apparatus for an automatic transmission which is capable of preventing shift shock.
Therefore, a shift control apparatus for an automatic transmission according to an aspect of the present invention has: a first engagement element; a second engagement element; a third engagement element; a fourth engagement element; and a shift control processing unit causing engagement of the first engagement element and engagement of the second engagement element for achieving a first shift speed, causing engagement of the third engagement element and engagement of the fourth engagement element for achieving a second shift speed, and inhibiting an increase in a torque capacity of one of the first and second engagement elements before starting release of the second engagement element, when shifting from the first shift speed to the second shift speed is performed.
In this case, during shifting from the first shift speed to the second shift speed, the increase in the torque capacity of one of the first and second engagement elements is inhibited before starting release of the second engagement element.
This design prevents a step-like shift shock from being caused by delayed progression of shifting when release of the second engagement element is started.
The shift control apparatus for the automatic transmission according to a further aspect of the invention may be structured such that the shift control processing unit includes a first hydraulic pressure control processing unit stopping a feedback control for a first servo hydraulic pressure in the first engagement element, during a time period from starting a decrease of a second servo hydraulic pressure in the second engagement element to starting release of the second engagement element.
In this case, during a period from starting the decrease of the second servo hydraulic pressure in the second engagement element to starting release of the second engagement element, a feedback control for the first servo hydraulic pressure in the first engagement element is stopped, to prevent an increase of the first servo hydraulic pressure until the first shift is completed
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Exercise Devices 
