Despite the global transition towards electromobility, which is being driven by environmental policy and technological advances, internal combustion engines will remain crucial for the automotive industry in the coming years. This is due to the current limitations in battery technology, incomplete charging infrastructure and the specific limitations of fuel cell technology. Improving the efficiency and reducing the emissions of internal combustion engines are therefore crucial to comply with stringent greenhouse gas emission regulations, while at the same time supporting a gradual transition towards full vehicle electrification.
The accuracy of determining dynamic parameters of internal combustion engines largely depends on the accuracy of in-cylinder pressure measurements, which serve as the basis for determining these parameters. Until now, the accuracy of high-frequency pressure measurements in internal combustion engines has been limited, as pressure sensors used in these applications have traditionally been calibrated quasi-statically using conventional static pressure standards.
In the article ‘A method for determining the high-frequency in-cylinder pressure of an internal combustion engine using a pressure sensor dynamically calibrated with a shock tube’ published in the prestigious journal Mechanical Systems and Signal Processing (IF = 8.9), researchers from the Laboratory for Measurements in Process Engineering (LMPS) and the Laboratory for Internal Combustion Engines and Electromobility (LICeM) in collaboration with researchers from the ETC Laboratory at the Institute of Automotive Industry Hidria Advancetec developed and evaluated a novel method for determining high-frequency in-cylinder pressure of internal combustion engines using a pressure sensor dynamically calibrated with a shock tube.
The results show that the proposed method improves the accuracy of the in-cylinder pressure measurements by up to 13% and thus the determination of the rate of pressure rise by up to 38%, the average in-cylinder gas temperature by up to 5% and the rate of heat release by as much as 48%. “The development of the new method enables the use of dynamically calibrated pressure sensors, which significantly improves the accuracy of determining dynamic parameters of internal combustion engines and thus makes an important contribution to the further development of engines with higher efficiency and lower emissions,” emphasizes the first author of the study, assist. prof. Andrej Svete, PhD.
Link to the article: https://www.sciencedirect.com/science/article/pii/S088832702501235X