Shift control system of automatic transmission

Details Shift control system of automatic transmission Shift control system of automatic transmission

2005-11-22

2005-11-22

Lewis, Tisha (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S120000, C477S125000, C477S906000, C701S062000

Reexamination Certificate

active

06966862

ABSTRACT:
In a case of an electric failure caused to a traveling vehicle and when any of forward gears is held at a step S5,a comparison is made between: 1) a supposedly-engaged friction element of friction elements which is supposed to be engaged at the any of the forward gears and 2) an actually-engaged friction element of the friction elements which is sensed to be actually engaged, the sensing being based on a switch signal from a first hydraulic pressure switch11,a second hydraulic pressure switch12,a third hydraulic pressure switch13,a fourth hydraulic pressure switch14and a fifth hydraulic pressure switch15.When the supposedly-engaged friction element is not in accordance with the actually-engaged friction element, an electric system is determined to be in failure. In the case of the electric failure, a routine moves to a step S6and subsequent steps for sticking the gear of an automatic transmission to a given gear.As described above, a shift control system of the automatic transmission is thus provided that can eliminate a sleeping failure thereby securely preventing an interlock and that can secure a high shift controllability which is not, in a period of shift, restricted in terms of hydraulic pressure control range of each of the friction elements.

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