| 摘要 |
A digitally controlled current to pressure converter (CPC) (102) is provided. The digital CPC (102) utilizes a digital controller (124) and an onboard pressure transducer (158) to accurately control the output pressure based upon an input analog control signal. The digital controller (124) includes an anti-silting algorithm that provides an impulse movement to a three-way rotary valve (140) of the CPC (102) to loosen and flush away silt contamination from the valve (140). A redundant seal stack including an intermediate passage (154) to the hydraulic drain ensures a low pressure drop across the outboard seal (156) minimizing the potential for leakage and improving reliability of the CPC (102). The digital controller (124) also includes redundancy and fault management algorithms that enable the use of multiple inputs and feedback signals for control of the CPC (102). Master/slave operation and transitioning is also provided by the digital controller (124). |
