| 发明名称 | Hydraulic control system having over-pressure protection | ||
| 摘要 | A hydraulic control system for a machine is disclosed. The hydraulic control system may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, an actuator, and a control valve configured to direct fluid from the pump to the actuator and from the actuator to the tank to move the actuator. The hydraulic system may also have a main relief valve movable away from a closed position to pass pressurized fluid to the tank when a pressure of the fluid directed to the actuator exceeds a first threshold pressure, and a controller in communication with the pump. The controller may be configured to selectively reduce a displacement of the pump after the main relief valve has moved away from the closed position when the pressure of the fluid directed to the actuator exceeds a second threshold pressure. | ||
| 申请公布号 | US9145660(B2) | 申请公布日期 | 2015.09.29 |
| 申请号 | US201213714017 | 申请日期 | 2012.12.13 |
| 申请人 | Caterpillar Inc. | 发明人 | Peterson Randal N.;Egelja Aleksandar M.;Cesur Rustu |
| 分类号 | E02F9/22;F15B11/042;F15B20/00;F15B21/04 | 主分类号 | E02F9/22 |
| 代理机构 | Finnegan, Henderson, Farabow, Garrett & Dunner, LLP | 代理人 | Finnegan, Henderson, Farabow, Garrett & Dunner, LLP |
| 主权项 | 1. A hydraulic control system, comprising: a tank; a pump configured to draw fluid from the tank and pressurize the fluid; an actuator; a control valve configured to direct fluid from the pump to the actuator and from the actuator to the tank to move the actuator; a main relief valve movable away from a closed position to pass pressurized fluid to the tank when a pressure of the fluid at the actuator exceeds a first threshold pressure; and a controller in communication with the pump and configured to selectively reduce a displacement of the pump after the main relief valve has moved away from the closed position when the pressure of the fluid at the actuator exceeds a second threshold pressure. | ||
| 地址 | Peoria IL US | ||