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Thermally checking the state or the condition of a hydraulic fluid

  • US 4,869,596 A
  • Filed: 11/29/1988
  • Issued: 09/26/1989
  • Est. Priority Date: 11/20/1986
  • Status: Expired due to Term
First Claim
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1. A method for determining the state or condition of a fluid contained in a hydraulic brake system, in a vehicle wherein said fluid has a boiling point, a temperature and a characteristic value in relation to the boiling point, said characteristic value being a resistance value measured according to a current and being determinable by means of a sensor element in said system, the method comprising determining an instantaneous thermal state of the fluid with sensor elements located in said system, measuring the instantaneous temperature and the characteristic value, determining from a comparison of said measurements of the instantaneous temperature and characteristic value, an instantaneous thermal reserve of the fluid in the system, said instantaneous thermal reserve being a value that is the difference between a predetermined stored temperature value of the fluid and the actual temperature of the fluid during braking operation, and emitting a warning signal when said instantaneous thermal reserve coincides with a predetermined minimum value.

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