发明名称 |
Pump torque control system for hydraulic construction machine |
摘要 |
A pump torque control system is capable of preventing hunting due to interference between speed sensing control and control of an engine speed of a prime mover when the temperature of a hydraulic fluid is low. A maximum absorption torque is set in a regulator 31 that controls displacement volumes of hydraulic pumps 2 and 3 based on a deviation between target and actual engine speeds of a prime mover 1. A second modification factor calculating section 45 and a control gain modifying section 49, which are included in a controller 23 that performs speed sensing control to ensure that the maximum absorption torque of the hydraulic pumps 2 and 3 is reduced, change a control gain of the speed sensing control based on a value detected by the hydraulic temperature sensor 34 to ensure that the control gain is reduced as the temperature of the hydraulic fluid is reduced. |
申请公布号 |
US8424298(B2) |
申请公布日期 |
2013.04.23 |
申请号 |
US20080445605 |
申请日期 |
2008.01.30 |
申请人 |
ARIGA NOBUEI;ISHIKAWA KOUJI;KARASAWA HIDEO;OKANO YASUO;NAKAMURA KAZUNORI;KOWATARI YOUICHI;HITACHI CONSTRUCTION MACHINERY CO., LTD. |
发明人 |
ARIGA NOBUEI;ISHIKAWA KOUJI;KARASAWA HIDEO;OKANO YASUO;NAKAMURA KAZUNORI;KOWATARI YOUICHI |
分类号 |
F16D31/02 |
主分类号 |
F16D31/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|