Apparatus and method for determining a failure in an...

Details Apparatus and method for determining a failure in an... Apparatus and method for determining a failure in an...

2006-06-06

2006-06-06

Jeanglaude, Gertrude A. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

C701S051000, C701S052000, C701S101000, C477S075000

Reexamination Certificate

active

07058497

ABSTRACT:
When a shift routine is not being executed in an automatic transmission and a difference between an actual turbine speed and a calculated synchronous speed is equal to, or greater than, a preset value α, a difference ΔNT between an estimated turbine speed and the actual speed when the automatic transmission is in a neutral state is calculated. When ΔNT is equal to, or less than, a preset value β, it is determined that a failure related to the neutral state of the automatic transmission has occurred. Also, when ΔNT is greater than a preset value β, it is determined that a failure related to slipping of a frictional engaging element has occurred.

REFERENCES:
patent: 5629852 (1997-05-01), Yokoyama et al.
patent: 6024671 (2000-02-01), Sawa et al.
patent: A 62-163831 (1987-07-01), None
patent: 1-172663 (1989-07-01), None
patent: A 4-159139 (1992-06-01), None
patent: 7-107425 (1995-11-01), None
patent: A 8-210489 (1996-08-01), None

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