To further reduce fuel consumption while maintaining while maintaining a required tractive force, and to carry out speed change not leading to engine stall in a working vehicle such as a wheel loader.
When a speed ("drive", "second speed") suitable for work is selected by a speed change operator 70, a control means 80 makes a modulation clutch 20 engaged in response to the vehicle speed V drop, and makes a lock-up state where a lock-up clutch 40 is engaged to transit to a lock-up and modulation clutch slip state where the lock-up clutch is engaged and the modulation clutch is slipping. Subsequently, the control means causes transition to a both clutch slip state where the lock-up clutch and the modulation clutch are slipping in response to the vehicle speed V drop.
| JPH07277038 | VEHICLE CONTROL DEVICE |
| JPH02253048 | ENGINE BRAKE CONTROL DEVICE USING LOCK-UP CLUTCH |
| JP2758921 | [Title of Invention] Lockup Clutch Control Device |
KUMA MASAAKI
KUZE TAKASHI
| JPH084876A | 1996-01-12 | |||
| JP2006022939A | 2006-01-26 |
| WO2005040629A1 | 2005-05-06 |
Yoshiyuki Obata