| 摘要 |
<p>A method and apparatus for controlling a two-stage valve (10) using a closed-loop control system, the system including a variable gain element (54), the method involving continually performing the steps of estimating the flow gain of the pilot stage (12) of the valve; comparing the estimated flow gain with a reference flow gain; and in response to said comparison step, adjusting the gain of the variable gain element (54) to maintain a substantially constant closed-loop gain. <IMAGE></p> |
