Title:
CONTROL DEVICE FOR CONTINUOUSLY VARIABLE TRANSMISSION
Document Type and Number:
WIPO Patent Application WO/2018/003778
Kind Code:
A1
Abstract:
A control device for a continuously variable transmission that is provided with a primary pulley (30), a secondary pulley (40) and a pulley belt (50), and in which gear change control for changing the pulley gear ratio is accomplished by control of a primary pressure (Ppri) and secondary pressure (Psec). Provided is a control device for a belt-type continuously variable transmission (CVT), said control device being equipped with a CVT controller (15), which, during a downshift request associated with deceleration, performs return-to-low promoting control, wherein by at least reducing the primary pressure (Ppri), the differential pressure between the secondary pressure (Psec) and the primary pressure (Ppri) is increased. When performing return-to-low promoting control, the CVT controller (15) sets a secondary pressure lower limit, which is the lower limit for the secondary pressure (Psec), to a value higher than the minimum secondary pressure necessary to keep belt slippage with respect to input torque to the secondary pulley (40) from occurring.
Inventors:
TOKOI HIROYUKI (JP)
YONEDA KENJI (JP)
MIYAISHI HIRONORI (JP)
YONEDA KENJI (JP)
MIYAISHI HIRONORI (JP)
Application Number:
PCT/JP2017/023512
Publication Date:
January 04, 2018
Filing Date:
June 27, 2017
Export Citation:
Assignee:
JATCO LTD (JP)
NISSAN MOTOR (JP)
NISSAN MOTOR (JP)
International Classes:
F16H61/02; F16H59/68; F16H61/662
Foreign References:
| JPH08285021A | 1996-11-01 | |||
| JP2012241799A | 2012-12-10 | |||
| JPH08277924A | 1996-10-22 | |||
| JP2012042037A | 2012-03-01 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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