发明名称 |
Method and apparatus for limiting the power output of a hydraulic system |
摘要 |
An apparatus for limiting the power output of a hydraulic system is disclosed. The hydraulic system has a variable displacement pump. The variable displacement pump has a movable swashplate and is driven by a source of motive power. The apparatus includes a memory device for storing a set of power modes. Each power mode has a predetermined power level associated with the hydraulic system and is defined by a plurality of set points. Each set point corresponds to a predetermined flow rate and discharge pressure of the pump. A device senses the speed of the source of motive power and producing a signal representative of the actual speed in response to the sensed speed. A device senses the pressure of the variable displacement pump and produces a signal representative of the actual pressure in response to the sensed pressure. A device senses the swashplate angle of the variable displacement pump and delivers a signal representative of the actual swashplate angle in response to the sensed swashplate angle. A device receives a desired power mode signal having a desired power level. The desired power level is different from the predetermined power levels associated with the set of power modes. A control device receives the actual speed, pressure and swashplate angle signals, and responsively determines a desired flow limit of the pump. The desired flow limit corresponds to the desired power level. |
申请公布号 |
US5267441(A) |
申请公布日期 |
1993.12.07 |
申请号 |
US19920819704 |
申请日期 |
1992.01.13 |
申请人 |
CATERPILLAR INC. |
发明人 |
DEVIER, LONNIE J.;KRONE, JOHN J.;LUNZMAN, STEPHEN V.;MARSDEN, HOWARD A. |
分类号 |
E02F9/20;E02F9/22;F04B49/06;F15B11/00;(IPC1-7):F16D31/02 |
主分类号 |
E02F9/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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