An automotive engine oil viscosity sensor

Distinguishing Gasoline Engine Oils of Different Viscosities Using Terahertz Time-Domain Spectroscopy

“…Sensor systems researched have included infrared [2][3][4], hyperspectral [5], resonating [6][7][8][9][10], and electrochemical [11][12][13][14][15][16]. These sensors have attempted to monitor oil conditions such as viscosity [7,8,12,17]; acidity [6,[14][15][16]18]; fuel, water, or antifreeze contamination [3]; and antioxidants [11,13].…”

Using Terahertz Time-Domain Spectroscopy to Discriminate among Water Contamination Levels in Diesel Engine Oil

“…Sensor systems studied have included electromechanical (Cheek and Mowery, 1989;Duchowski and Mannebach, 2006;Price and Clarke, 1991;Soleimani et al, 2013;Wang et al, 1994;Wang, 2002) and resonating sensors (Agoston et al, 2005;Jakoby et al, 2003;Milpied et al, 2010;Mohammed and Hassan, 2013). Infrared (Blanco et al, 1998;Borin and Poppi, 2005;Kasberger et al, 2011) and hyperspectral (Lulu et al, 2014) spectroscopy techniques have also been used.…”

“…Infrared (Blanco et al, 1998;Borin and Poppi, 2005;Kasberger et al, 2011) and hyperspectral (Lulu et al, 2014) spectroscopy techniques have also been used. The oil conditions these sensors attempted to monitor were acidity (Agoston et al, 2005;Moon et al, 2006;Soleimani et al, 2013;Wang et al, 1994;Wang, 2002), antioxidants (Cheek and Mowery, 1989;Price and Clarke, 1991), viscosity (Duchowski and Mannebach, 2006;Jakoby et al, 2003;Schmitigal and Moyer, 2005), and contaminants of fuel, water, or antifreeze (Borin and Poppi, 2005). No single sensor has been preferred, and researchers have indicated that some combination would be required for monitoring oil condition (Milpied et al, 2010;Schmitigal and Moyer, 2005).…”

Colloidal Stability of Metal Nanoparticles in Engine Oil under Thermal and Mechanical Load

“…The obtained results have shown that dispersed gold nanoparticles in full-synthetic engine oil have great potential as nanolubricants since besides known good tribological properties [3] they possess a high stability at room temperature and under harsh conditions, i.e., 150°C, 6 bar, 2 h, representing real engine conditions [36]. This high colloidal stability can originate from different physicochemical aspects as discussed in the following.…”

“…1 b). As liquid temperature 150°C is chosen since it is the maximum temperature in engines [36]. The colloid is filled into an oil tank and pumped by an internal circulating pump through an oil filter, which separates bigger particles and contaminations from the engine oil.…”