Device for temporarily blocking the re-measurement of an electri

Details Device for temporarily blocking the re-measurement of an electri Device for temporarily blocking the re-measurement of an electri

1985-08-06

1988-04-19

Rowland, James L.

Communications: electrical

Selective

Having indication or alarm

340622, 73290R, B60Q 100

Patent

active

047393017

ABSTRACT:
A device for electrically measuring the oil level of a machine, particularly of an internal combustion engine, is connected with a device for temporarily blocking re-measurement. The device for the measurement of the oil level comprises a measurement probe (2) which is heated by a constant current during a connect time which is commenced in an automotive vehicle by a switch on a battery terminal (15). Furthermore, means are provided for comparing an initial voltage U.sub.O of the measurement probe at the start of the connect time with a measured voltage at the end of the connect time of a measurement period in order to form a result of the comparison which corresponds to the oil level. A signalling logic (7) which signals ranges of the oil level can be controlled by said result. The blocking-time transmitter, in combination with a control logic (10) for the total program control, blocks repeated measurement during at least one predetermined period of time after the machine is turned off or again turned on. In order to take into account a temperature-dependent difference in returning-flow time of the oil in ducts of the machine before a new measurement, the blocking-time transmitter (21-24) can be controlled to produce a variable blocking time as a function of the initial voltage U.sub.O of the initial measurement, in such a manner that the blocking time decreases with an increase in the initial voltage U.sub.O.

REFERENCES:
patent: 4503419 (1985-03-01), Kidd et al.

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