Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1992-04-02
1993-12-28
Cuchlinski, Jr., William A.
Measuring and testing
Liquid level or depth gauge
Thermal type
73304R, 73 1H, G01F 2324, G01F 2500
Patent
active
052729192
ABSTRACT:
A method for measuring the level of filling, such as the level of oil in an automotive engine, employs a hot-wire measuring device in which a hot-wire transmitter (5) is charged with a predetermined constant current, and an increase in voltage over the hot-wire transmitter is detected within a predetermined period of time. Errors due to digitizing and inaccurate calibration are avoided by the simplest possible means. For this purpose, a current source (1), which is controlled by an input voltage, is used as a source of the constant current. Furthermore, in a preparatory stage, after an assembly of the hot-wire measuring device, an input voltage (PWM) is changed until, at an input-voltage value wherein the current source (1) produces the predetermined constant current (IK). The input-voltage value is used in subsequent measuring stages to control the source of current.
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Cuchlinski Jr. William A.
Farber Martin A.
Gutierrez Diego F. F.
VDO Adolf Schindling AG
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