In-Cylinder Pressure Measurements with Optical Fiber and Piezoelectric Pressure Transducers

Internal Combustion Engine Indicating Measurements

“…The scattering of points with respect to the diagonal of the graph allows judging about the repeatability of the experiment. The behaviour observed in Figure 4 attests for a good repeatability and is similar to that reported by Roth et al (2001) for transducers akin to the one used in this example. www.intechopen.com…”

A new engine indicating measurement procedure for combustion heat release analysis

“…Short-term drift, known as thermal shock, results from the heat flux variations within each cycle and causes pressure readings to be slightly higher than the actual cylinder pressure during combustion and slightly smaller during the remaining part of the power stroke. It cannot be readily identified or suppressed during signal processing, and may endanger the reliability of cylinder pressure data [11,[14][15][16][17][18][19][20]. In this study, the extension of the short-term drift was assessed using the test procedure proposed by Randalph [19,20], and it was found to be compatible with data reported for transducers similar to that employed here [20].…”

“…It cannot be readily identified or suppressed during signal processing, and may endanger the reliability of cylinder pressure data [11,[14][15][16][17][18][19][20]. In this study, the extension of the short-term drift was assessed using the test procedure proposed by Randalph [19,20], and it was found to be compatible with data reported for transducers similar to that employed here [20].…”

Multivariate Knock Detection for Development and Production Applications

“…However, independent studies [Roth, K.J. et al, 2002, Tousignant et al, 2002, Tousignant et al, 2004] indicate a lack of reproducibility in Optrand's commercially available transducers.…”