Electronically controlled automatic transmission

Details Electronically controlled automatic transmission Electronically controlled automatic transmission

Filed on

1987-08-10

Date issued

1989-09-26

Examiner

Lall, Parshotam S.

Patent Class

Boots, shoes, and leggings

Other Related Categories

74866, 74867, B60K 4108, G05D 1302, G05D 1702

Type

Patent

Status

active

Patent number

048705810

Description

ABSTRACT:
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.

REFERENCES:
patent: 4667540 (1987-05-01), Yagi
patent: 4691285 (1987-09-01), Takeda
patent: 4698763 (1987-10-01), Smyth
patent: 4707789 (1987-11-01), Downs et al.
patent: 4710879 (1987-12-01), Vahabzadeh
patent: 4742461 (1988-05-01), Eschrich et al.

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