Control apparatus of vehicular automatic transmission

Details Control apparatus of vehicular automatic transmission Control apparatus of vehicular automatic transmission

2008-09-02

2008-09-02

Le, David D. (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S119000, C475S120000, C475S121000, C475S128000, C475S133000, C475S134000, C477S125000, C477S906000

Reexamination Certificate

active

11478730

ABSTRACT:
At the time of a failure in the second group of engagement devices, the manner of input of oil pressures to a fail-safe valve group is changed via a priority degree switching valve on the basis of the state of engagement of engagement devices of the first group in such a manner that the predetermined degrees of priority for the supply of one of oil pressures PC4, PB1output from linear solenoid valves SL4, SL5to a corresponding one of a clutch C4and a brake B1via the fail-safe valve group are changed so as to avoid an event that the fail-safe gear stage established in order to prevent the occurrence of interlock of the automatic transmission involves a downshift of two or more stages from the speed change stage maintained immediately prior to the occurrence of the failure. Therefore, it is possible to prevent the occurrence of an uncomfortable behavior of the vehicle caused by the shift to the fail-safe gear stage.

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