Method of and system for deciding failures of automatic transmis

Details Method of and system for deciding failures of automatic transmis Method of and system for deciding failures of automatic transmis

1996-05-13

2000-09-26

Louis-Jacques, Jacques H.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

701 51, 701 67, 192 33, 192 358, 477169, G06F 1700

Patent

active

061253162

ABSTRACT:
A gear shift failure of an automatic transmission to a wrong gear other than an indented gear is made by estimating slippage theoretically caused in a torque converter on the basis of an engine speed and a turbine speed theoretically determined for an intended gear according to the vehicle speed and comparing the estimating slippage with predetermined reference slippage. When the estimated slippage exceeds the predetermined threshold slippage, it is decided that there has occurred a wrong shift to a gear other than the intended gear.

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