CONTROL DEVICE AND CONTROL METHOD FOR AUTOMATIC TRANSMISSION

WIPO Patent Application WO/2021/106785

A1

A transmission control unit includes a gear ratio abnormality determination unit, and a limp-home control unit. The gear ratio abnormality determination unit, while travelling in a predetermined gear position, determines a gear ratio abnormality when the difference between an actual gear ratio, which is calculated from a transmission input shaft rotation speed and a transmission output shaft rotation speed, and a set gear ratio for the predetermined gear position reaches or exceeds a set value. The limp-home control unit: outputs a disengaging instruction to disengage all of a plurality of friction elements when the gear ratio abnormality determination unit determines a gear ratio abnormality; determines, upon confirmation of shifting to a neutral state by the output of the disengaging instruction, engagement/disengagement of a specific friction element among the plurality of friction elements on the basis of rotation/stopping information about a rotating member included in a gear train; determines a retreating gear position on the basis of determination information about engagement/disengagement of the specific friction element; and executes shifting to the determined retreating gear position.

AMANO NORIHIRA (JP)
HAMANO MASAHIRO (JP)

PCT/JP2020/043399

June 03, 2021

November 20, 2020

Click for automatic bibliography generation  

JATCO LTD (JP)
NISSAN MOTOR (JP)

F16H59/38; F02D29/00; F16H59/70; F16H61/12; F16H61/68; F16H63/50

WO2017150137A1

2017-09-08

JP2004068989A	2004-03-04
JP2015090191A	2015-05-11
JP2000240785A	2000-09-05
JP2017155779A	2017-09-07

GOTOH & PARTNERS (JP)

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