Means for sensing change in the amount of fluent material in a r

Details Means for sensing change in the amount of fluent material in a r Means for sensing change in the amount of fluent material in a r

1974-11-04

1976-08-31

Caldwell, John W.

Communications: electrical

Systems

Call station

331 65, 340 59, 340244C, G08B 2100

Patent

active

039784649

ABSTRACT:
A fluid level sensor comprising a novel electronic circuit which monitors change in the fluid level in a reservoir through a conductive probe disposed therein. The probe and a capacitor are electrically connected in a circuit which is intermittently energized to create an electrical transient therein. The transient is monitored, and a warning is given when the transient indicates that the probe is not in contact with the fluid in the reservoir. Two species of the invention are disclosed as applied to a vehicle hydraulic brake system having a dual reservoir type master brake cylinder with a probe for each reservoir. In one species, only a single capacitor is required since the electronic circuit electrically connects each probe with the capacitor sequentially by means of time multiplexing. In the other species, a capacitor is required for each probe and the transients in each capacitor/probe circuit are fed to a logic circuit which determines if any of the probes is out of contact with the fluid in the reservoir. The electronic circuit is especially adapted for fabrication as an integrated circuit chip using C-Mos technology. With such a circuit chip a minimum number of terminals are required to connect external components to the chip for performing the fluid level sensing function.

REFERENCES:
patent: 3694804 (1972-09-01), Hill

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