Exxonmobil Research and Engineering Company

Airbus France

Jean-Michel Pascual

Marc-Andre Poirier

Shlomo Antika

Yann Nicolas

Nicolas Dubois

Cedric Tallot

Gerard Dallemagne

The invention concerns a device and method for checking the state of an accumulator with energy reserve that is connected to a fluid system. According to the invention, the fluid system is first of all pressurized and this fluid is maintained at an operating pressure Pfor at least a time &#x3c4; so as to ensure the stabilization of this fluid system. Then the pressurisation of the fluid system is stopped and the time &#x394;t taken by the system to pass from a predetermined pressure Pto a predetermined pressure P, with P&#x3c;P&#x3c;P, is determined. This period &#x394;t is compared with a predetermined reference time T.

Device and method for controlling the state of an energy accumulator

The present invention is a method for operating a hydraulic system at pressures of about 4000 psi or higher, preferably about 5000 psi or higher by using as the lubricant a phosphate ester hydraulic oil comprising a fire resistant phosphate esters base stock, a viscosity index improver, an anti erosion agent, an acid scavenger. The fluid used in the present method can also contain rust inhibitors and/or antioxidants.

Method for lubricating high pressure hydraulic system using phosphate ester hydraulic fluid

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Venerque, France

Jean-Michel Pascual