Machine element or mechanism – Gearing – Interchangeably locked
Patent
1998-08-05
1999-11-30
Wright, Dirk
Machine element or mechanism
Gearing
Interchangeably locked
477 98, F16H 6100
Patent
active
059922559
ABSTRACT:
In a control apparatus for a hydraulically operated vehicular transmission having a plurality of speed stages to be established by a selecting operation of a plurality of hydraulic clutches, when a command to downshift to G(N-2) is issued in the course of downshifting to G(N-1) and a flag FTBD is set to 1, a control is performed to accelerate the time of completion of the downshifting control to G(N-1). When that oil temperature in the transmission which is detected by an oil temperature sensor is lower than a predetermined value, the setting of FTBD to 1 is prohibited. Therefore, at the time of low oil temperature, the downshifting to G(N-1) is performed in an ordinary manner. At the time of starting of the downshifting control from G(N-1) to G(N-2), the hydraulic pressure in the hydraulic clutch for the speed stage G(N-1) is sufficiently increased. A smooth downshifting to G(N-2) can thus be smoothly performed without the occurrence of excessive engine racing.
REFERENCES:
patent: 4998449 (1991-03-01), Baba et al.
patent: 5058014 (1991-10-01), Saitou et al.
patent: 5345843 (1994-09-01), Fujita et al.
patent: 5518468 (1996-05-01), Sametz et al.
Fujita Hironori
Katano Hiroyuki
Miyamoto Osahide
Shibuya Kouji
Shuto Yoshiaki
Honda Giken Kogyo Kabushiki Kaisha
Wright Dirk
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