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Title:
WORK VEHICLE
Document Type and Number:
WIPO Patent Application WO/2019/176888
Kind Code:
A1
Abstract:
The present invention improves fuel efficiency by shortening the adjustment time for the engine speed during gear-shifting. A control device (100): performs gear shift by releasing a lock-up clutch (C1) and a transmission clutch (C2) during a shift-up operation; when a first rotation speed (N1) on the output side of the transmission clutch is stepped down, reduces a third rotation speed (N3) on the input side of the transmission clutch so as to match the first rotation speed by causing a generator motor (7) to perform a regenerative operation; when the third rotation speed matches the first rotation speed, engages the transmission clutch and reduces a second rotation speed (N2) of an output shaft of an engine (1) so as to match the first rotation speed, by causing a generator (5) to perform a regenerative operation; and engages the lock-up clutch in the case when the first rotation speed, second rotation speed, and third rotation speed match with each other and when the torque of the engine is greater than that of the generator motor.

Inventors:
KAMIYA Akinori (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
KANEKO Satoru (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
ITO Noritaka (HITACHI CONSTRUCTION MACHINERY CO. LTD., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
UTASHIRO Hiroshi (HITACHI CONSTRUCTION MACHINERY CO. LTD., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
TAKADA Tomonori (HITACHI CONSTRUCTION MACHINERY CO. LTD., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
SEKINO Satoshi (HITACHI CONSTRUCTION MACHINERY CO. LTD., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
TOKUDA Katsuhiko (HITACHI CONSTRUCTION MACHINERY CO. LTD., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2019/009827
Publication Date:
September 19, 2019
Filing Date:
March 11, 2019
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (16-1, Higashiueno 2-chome Taito-k, Tokyo 15, 〒1100015, JP)
International Classes:
B60W20/00; B60K6/387; B60K6/442; B60W10/02; B60W10/08; B60W10/10; E02F9/22; F16H59/46; F16H61/02; F16H61/21; F16H61/682; F16H63/46; F16H63/50
Foreign References:
JP2008074197A2008-04-03
JP2000074202A2000-03-14
JP2017109552A2017-06-22
JP2016104927A2016-06-09
JP2002120602A2002-04-23
JP2004150450A2004-05-27
JPH02157437A1990-06-18
Attorney, Agent or Firm:
THE PATENT BODY CORPORATE TAKEWA INTERNATIONAL PATENT OFFICE (UNIZO Nishishimbashi 3-chome Bldg, 13-3 Nishishimbashi 3-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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