发明名称 |
Positioning apparatus and method utilizing PWM control of a double-acting hydraulic cylinder |
摘要 |
A double-acting hydraulic cylinder is controlled by a pair of three-way solenoid valves respectively fluid connected to the two ends of the cylinder and energized in parallel with a continuous stream of pulse width modulated (PWM) pulses to create a mean effective fluid pressure balance at the cylinder ends that hold a desired position of a connected load and mean effective fluid pressure imbalances in the cylinder ends that produce variable rate load movement in either of two directions to a desired new position, all determined by the pulse duty cycle.
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申请公布号 |
US5542336(A) |
申请公布日期 |
1996.08.06 |
申请号 |
US19950423069 |
申请日期 |
1995.04.17 |
申请人 |
MARTIN MARIETTA CORPORATION |
发明人 |
LARKIN, ROBERT F. |
分类号 |
F15B9/09;F15B9/03;G05D3/00;G05D3/18;(IPC1-7):F01B1/00;F15B15/17 |
主分类号 |
F15B9/09 |
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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