Thermally checking the state or the condition of a hydraulic flu

Details Thermally checking the state or the condition of a hydraulic flu Thermally checking the state or the condition of a hydraulic flu

1988-11-29

1989-09-26

Yasich, Daniel M.

Thermal measuring and testing

Transformation point determination

Between gaseous and liquid states

73 27R, 188 111, F16D 6600, G01N 2510

Patent

active

048695963

ABSTRACT:
A method and device are disclosed for determining and checking a state or condition of a hydraulic fluid contained in a brake system, including a state of hydration and/or age such that the fluid boiling point is reduced. The boiling point or a characteristic value of the fluid which depends on the boiling point, on the one hand, and the instantaneous temperature value of the fluid, on the other hand, are measured by means of sensor elements. These two values represent a range of permissible comparative temperature values, including a thermal reserve which is within that same range and is determined for further permissible heating of the fluid. A warning signal is released when a predetermined minimum value of the thermal reserve is reached. The sensor elements have hollow spaces with open walls permitting fluid flow-through and have such a design as to ensure that, after heating-up, there comes about a stable cellular convection in a temperature range lying below the boiling temperature. The cellular convection is used as an indication of the condition or the state of the fluid.

REFERENCES:
patent: 4408902 (1983-10-01), Peuker
patent: 4484822 (1984-11-01), Hancock
patent: 4559813 (1985-12-01), Brekelmans
patent: 4566805 (1986-01-01), Klein et al.
patent: 4589277 (1986-05-01), Collins et al.

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