초록 ▼

Plural servo actuators are coupled to provide a redundant system for operating a common output device. Each servo actuator has plural servo valves each having one active output that causes controlled opposite operation of the output device and one passive output. A fault detector coupled to each ser

Plural servo actuators are coupled to provide a redundant system for operating a common output device. Each servo actuator has plural servo valves each having one active output that causes controlled opposite operation of the output device and one passive output. A fault detector coupled to each servo actuator compares the sum of the passive output pressures with the pressures of two other fluid signals, in one case the supply and return fluid signals and in another case the two active output signals of the servo valves, to detect the condition thereof. A convenient checkout system and a fluid by-pass mechanism also are provided in the fault detector.

대표청구항 ▼

A monitor for monitoring the condition of a fluid system, comprising: a housing, sensor spool means movable in said housing and forming therewith plural respectively substantially fluidically isolated chambers for converting respective fluid pressures applied to said chambers from such system to rep

A monitor for monitoring the condition of a fluid system, comprising: a housing, sensor spool means movable in said housing and forming therewith plural respectively substantially fluidically isolated chambers for converting respective fluid pressures applied to said chambers from such system to representative forces, said spool means including plural surface areas exposed to fluid pressure in respective chambers in respective directions such that at least one of such forces opposes at least two of such forces tending to move said spool means to respective positions in said housing as an indication of the condition of such fluid system.