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An Advanced Electrothermal Sensor for Automotive Level Measurement
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English
Abstract
This paper describes a fuel level sensor, which basically consists of thin-film resistors encapsulated in Kapton foils. The thin-film elements are heated by constant current pulses and the immersed part is cooled by the liquid to be measured. This results in a change in resistance which can be detected by various types of evaluation circuitry discussed in the paper. This electrothermal principle has a number of advantages compared to conventional methods:
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- long life due to absence of mechanical moving parts or contacts
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- high media compatibility including ethanol or methanol containing fuels
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- high resolution in the “empty region”
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- easy shaping of output characteristics with unusual tank shapes
A status report on development progress is given including test results with first prototypes and a discussion of the achieved error-band.
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Citation
Haub, M., Jakobs, R., and Kuehnel, F., "An Advanced Electrothermal Sensor for Automotive Level Measurement," SAE Technical Paper 830106, 1983, https://doi.org/10.4271/830106.Also In
References
- Hucho, W. H. Proc. Int. Cong. Microelectronics, Munich 1980 136 141
- Europ. Pat. Appl. 1981 VDO Germany
- US Pat. 4 163 1979 Jaeger France