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Title:
DOWNSHIFT CONTROL DEVICE FOR AUTOMATIC TRANSMISSION AND DOWNSHIFT CONTROL METHOD FOR AUTOMATIC TRANSMISSION
Document Type and Number:
WIPO Patent Application WO/2019/176548
Kind Code:
A1
Abstract:
This downshift control device is provided with an engine 1, an automatic transmission 3, and an AT controller 10. The AT controller 10 includes a downshift downshifting progress processing unit that, when a downshift request is a request for power-on downshift which is caused by reduction in the vehicle speed with a predetermined accelerator opening APO maintained, performs pressure release control based on a release element command and pressure application control based on an engagement element command. When executing the power-on downshift, the downshift downshifting progress processing unit holds, until an inertia phase Ph3 ends, the release element command for a release element to start slippage during the elapse of a release capacity reduction phase Ph2. Accordingly, when power-on downshift which is caused by reduction in the vehicle speed is executed, a G step at an ending time of the inertia phase is made lesser so that discomfort provided to an occupant can be suppressed.

Inventors:
OTA, Yoshihiko (700-1 Imaizumi, Fuji-sh, Shizuoka 85, 〒4178585, JP)
IWAMOTO, Ikuhiro (700-1 Imaizumi, Fuji-sh, Shizuoka 85, 〒4178585, JP)
Application Number:
JP2019/007723
Publication Date:
September 19, 2019
Filing Date:
February 28, 2019
Export Citation:
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Assignee:
JATCO LTD (700-1, Imaizumi Fuji-sh, Shizuoka 85, 〒4178585, JP)
NISSAN MOTOR CO., LTD. (2 Takara-cho, Kanagawa-ku Yokohama-sh, Kanagawa 23, 〒2210023, JP)
International Classes:
F16H61/08; F16H59/68; F16H61/686; F16H63/50
Foreign References:
JP2007263338A2007-10-11
JP2006069267A2006-03-16
JP2013169925A2013-09-02
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (Ekisaikai Bldg. 1-29, Akashi-cho, Chuo-k, Tokyo 44, 〒1040044, JP)
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