Abstract
Both the low emission and fuel economy are most important in automotive technology. It is necessary to measure precisely the indicated mean effective pressure (IMEP), however, a lot of sampling data of the cylinder pressure are required for the calculation. In this paper the authors have proposed a simplified method for estimation of the IMEP, which utilizes the Fourier series transform. The new system is very effective even in the transient condition, as well as the steady state of engines, as the real time analysis for the response and accuracy.
