Electronically controlled automatic transmission

Details

Inventors: Ito, Yasunobu; Suzuki, Kenji; Nobuaki, Miki;
Assignee: Aisin-Warner Kabushiki Kaisha (Aichi, JP)
Primary Examiner: Lall; Parshotam S.
Assistant Examiner: Makay; Christopher L.
Attorney, Agent or Firm: Varndell Legal Group

A sensed shift time and a standard value of shift time set for this shift are compared. If the result of the comparison is that the shift time does not fall within an allowable range of standard values, a signal outputted to a linear solenoid is varied in such a manner that the shift time will be held with the range of the standard values. Accordingly, actual shift time while a vehicle is traveling is constantly fed back and controlled so as to attain an optimum shift time. Therefore, even if a change in the shift time is brought about by a change in oil temperature in the transmission or by aging of friction elements or the like, the shift time can be corrected to an optimum value to improve shift sensation as well as the durability of the friction elements.

DETAILED DESCRIPTION Accordingly, an object of the present invention is to provide an electronically controlled automatic transmission in which shift time is automatically adjusted so as to always be held within a set time, whereby shift sensation and the durability of the friction elements are improved.
According to the present invention, the foregoing object is attained by providing an electronically controlled automatic transmission having a throttle opening sensor in which a signal from the throttle opening sensor is outputted to a linear solenoid, thereby controlling a linear solenoid valve in a hydraulic circuit and regulating throttle pressure and line pressure, characterized by having shift time sensing means and preset shift time standard value data, wherein data outputted to the linear solenoid are altered when a sensed shift time lies outside an allowable range of shift time standard values.
Thus, in accordance with the invention, a sensed shift time and a standard value of shift time set for this shift are compared.
The present invention includes computing a gear ratio during a shift from input and output rpm's of an automatic transmission.
A shift time is computed by comparing a present gear ratio with gear ratios before and after the shift.
Further, the present invention provides a control by computing the gear ratio from the input and output rpm's of the automatic transmission on a real-time basis at all times when a shift is made, without relying upon an assumption or shift decision.
If the result of the comparison is that the shift time does not fall within the allowable range of standard values, the signal outputted to the linear solenoid is varied in such a manner that the shift time will be held with the range of standard values.
Accordingly, actual shift time while the vehicle is traveling is constantly fed back and controlled so as to attain an optimum shift time.
Therefore, even if a change in the shift time is brought about by a change in oil temperature in the transmission or by aging of the friction elements or the like, the shift time can be corrected to an optimum value to improve shift sensation as well as the durability of the friction elements

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