CONTROL DEVICE FOR AN AUTOMATIC TRANSMISSION

WIPO Patent Application WO/2010/073648

A1

Between the completion of gear shifting (for example, from third to fourth gear) and a first prescribed time T1, when it is determined that the gear ratio is at one of the gear ratios of the various gear shift levels, and the original gear ratio (4TH) and the computed gear ratio (5TH) differ, it is determined that clutch C-3 which should have been released has failed to engage. Meanwhile, when it is determined that between the completion of gear shifting and a first prescribed time Ta, the gear ratio has not achieved the gear ratio of any of the gear change levels, failure determination is suspended to prevent the incorrect determination that clutch C-2 has failed to disengage (is neutral). When it is subsequently determined that some gear ratio has been achieved over a second prescribed time Tb, the suspension of failure determination is cancelled and it is determined that clutch C-3 has failed to engage. An incorrect determination of failure after gear shifting is prevented, and failures can be quickly and accurately determined.

MURAKAMI SHINICHIRO (JP)
NISHIDE MASAKI (JP)
OBA TATSUYA (JP)

PCT/JP2009/007160

July 01, 2010

December 24, 2009

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AISIN AW CO (JP)
MURAKAMI SHINICHIRO (JP)
NISHIDE MASAKI (JP)
OBA TATSUYA (JP)

F16H61/12; F16H61/68; F16H61/684; F16H61/686; F16H59/40; F16H59/42; F16H59/70

JPH11280890A	1999-10-15
JP2008169872A	2008-07-24
JP2008232355A	2008-10-02
JP2008002553A	2008-01-10

CHIKASHIMA, Kazuo (JP)
近島 1 husband (JP)

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