Journal ArticleDOI
An automotive engine oil viscosity sensor
TLDR
In this article, the authors discuss the behavior of the viscosity of engine oil, its temperature dependence, and the resulting representation in terms of output signals of microacoustic sensors.Abstract:
For the evaluation of the condition of automotive engine oil, the oil's viscosity is one of the most important parameters. Using microacoustic viscosity sensors, an oil-viscosity measurement can be performed on-board. In this contribution, we discuss the behavior of the viscosity of engine oil, its temperature dependence, and the resulting representation in terms of output signals of microacoustic viscosity sensors. These considerations are illustrated by means of measurement results obtained for used oil samples, which have been obtained from test cars and fresh oil samples out of different viscosity classes. Finally, the detection of the viscosity increase due to soot contamination is demonstrated.read more
Citations
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Journal ArticleDOI
New Automotive Sensors—A Review
TL;DR: In this article, the primary automotive sensor technologies used today and their related system applications are described for sensors that measure speed/timing, mass air flow, and occupant safety/security.
Journal ArticleDOI
Lubricating oil conditioning sensors for online machine health monitoring – A review
TL;DR: A comprehensive review of the state-of-the-art online sensors for measuring lubricant properties (e.g. wear debris, water, viscosity, aeration, soot, corrosion, and sulfur content) is presented in this paper.
Journal ArticleDOI
Viscosity sensors for engine oil condition monitoring—Application and interpretation of results
TL;DR: In this article, the authors considered various sensor principles for the on-line monitoring of thermal aging of engine oils, which can be efficiently measured using microacoustic sensors, compared to conventional viscometers, which need to be considered in the interpretation of the measurement results.
Journal ArticleDOI
Miniaturized sensors for the viscosity and density of liquids-performance and issues
Bernhard Jakoby,Roman Beigelbeck,Franz Keplinger,Frieder Lucklum,A.O. Niedermayer,Erwin K. Reichel,Christian Riesch,Thomas Voglhuber-Brunnmaier,Bernhard Weiss +8 more
TL;DR: This paper reviews the recent work on vibrating sensors for the physical properties of fluids, particularly viscosity and density and several device designs and the associated properties are discussed.
Journal ArticleDOI
Characterizing Vibrating Cantilevers for Liquid Viscosity and Density Sensing
TL;DR: In this paper, an analytical model based on an approximation of the immersed cantilever as an oscillating sphere comprising the effective mass and the intrinsic damping of the cantilevers and additional mass and damping due to the liquid loading is presented.
References
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Journal ArticleDOI
Characterization of SH acoustic plate mode liquid sensors
TL;DR: Two-port acoustic wave sensors have been fabricated, which utilize shear horizontal (SH) acoustic plate modes (APMs) to probe a solid/liquid interface as mentioned in this paper, which propagate efficiently with liquid contacting the device and allow sensing to be performed on the side of the device opposite the transducers.
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Acoustic wave sensors and their technology
TL;DR: A comparison of the usability of different wave types is presented in this article, where planar technologies are used for fabrication of the acoustic-wave devices, which will be given of gas sensors, biochemical sensors in liquids, viscosity and density sensing and highvoltage sensing.
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Properties of Love waves: applications in sensors
TL;DR: In this article, the basic properties of Love wave and their utilization in sensor devices for (bio)chemical as well as for density and viscosity measurements are discussed in general and illustrated by means of numerical sample results for an -quartz layered structure.
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Determination of complex shear modulus with thickness shear mode resonators
TL;DR: In this article, the authors considered the acoustic behaviour and electrical response of a thickness-shear mode resonator on changes in shear parameters of the coating material at its fundamental frequency as well as its third and fifth harmonics.
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Viscosity sensing using a Love-wave device
TL;DR: In this paper, the authors report an effective way of measuring the viscosity of liquids by using a microacoustic Love-wave device and present experimental results together with a suitable electronic sensor set-up.