Title:
ABNORMALITY DIAGNOSING DEVICE AND ABNORMALITY DIAGNOSING METHOD FOR SELECTION SOLENOID VALVE OF AUTOMATIC TRANSMISSION
Document Type and Number:
WIPO Patent Application WO/2019/044789
Kind Code:
A1
Abstract:
A selection solenoid valve (75) performs control to engage/disengage a travel clutch (31, 32) in conjunction with a selection operation of a selector lever (90) which selects a range position of a belt-type continuously variable transmission (CVT). If the time required to determine engagement of the travel clutch (31, 32) from the start of selection to a travel range is less than a predetermined time, a selection solenoid valve abnormality diagnosing unit (8a) determines that the selection solenoid valve (75) has a maximum hydraulic pressure side abnormality. During a selection operation transitioning as follows, travel range → non-travel range → travel range, if a selection operation speed condition that the non-travel range selection time is shorter than a set time (Tth) is satisfied, execution of the selection solenoid valve (75) abnormality diagnosis is not permitted. Erroneous determinations are thus prevented.
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Inventors:
SON KEN (JP)
KASAHARA SEIJI (JP)
KASAHARA SEIJI (JP)
Application Number:
PCT/JP2018/031638
Publication Date:
March 07, 2019
Filing Date:
August 28, 2018
Export Citation:
Assignee:
JATCO LTD (JP)
NISSAN MOTOR (JP)
NISSAN MOTOR (JP)
International Classes:
F16H61/12; F16H59/08; F16H59/42; F16H61/66; F16H61/68
Foreign References:
| JP2009092210A | 2009-04-30 | |||
| JPH0231066A | 1990-02-01 | |||
| JP2001272411A | 2001-10-05 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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