Electrohydraulic servovalve safety apparatus

Details Electrohydraulic servovalve safety apparatus Electrohydraulic servovalve safety apparatus

1981-12-07

1984-09-25

Ruggiero, Joseph F.

Boots, shoes, and leggings

91363A, 235200R, 318563, 364141, 364180, 364187, G05B 902, G05B 2302

Patent

active

044738765

ABSTRACT:
Safety apparatus for an electrohydraulic servovalve. The safety apparatus includes a digital programmable switch (14) which is programmed to make switching decisions on the basis of whether or not the electrohydraulic servovalve is subjected to an external error and whether or not the electrohydraulic servovalve is free from internal error. Logic inputs that supply this information are provided to the programmable switch (14) by a logic device (16). On the basis of the logic inputs, the programmable switch (14) is programmed to interconnect, in a sequential manner, the analog electrohydraulic servovalve to one of four different analog drive systems. One of the drive systems is employed for the case whether there is no external or internal error, so that the electrohydraulic servovalve is in a normal mode of operation. Two of the drive systems are employed to quickly and safely de-energize the electrohydraulic servovalve upon the occurrence of an external error. The fourth drive system is employed to controllably re-energize the electrohydraulic servovalve back to its normal mode of operation, upon the removal of the external error.

REFERENCES:
patent: 3414884 (1968-12-01), Jensen
patent: 3489889 (1970-01-01), Escobosa
patent: 3724330 (1973-04-01), Mason
patent: 3744029 (1973-07-01), Nyman
patent: 4294162 (1981-10-01), Fowler et al.
patent: 4345191 (1982-08-01), Takats et al.

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