In this paper is proposed a methodology for the detection of mathematical correlations fit to predict the value that may have the wave effects on the operating parameters of internal combustion engines (MCI) such as, for example, the air flow, the load factor, etc.., varing the operate conditions. Through an experimental investigation and theoretical study, conducted using the computation program Gasdyn, has been found mathematical correlations useful to correct the results provided by fast algorithms "control-oriented" for the simulation of automotive MCI.The purpose of this study is to combine two requirements: to obtain a sufficiently accurate values and operate with a sufficiently reduced computation time. Actually, in fact, and especially in the case of automotive MCI, the algorithms that guarantee a sufficient accuracy are those that describe wave effects [1,2,3], but these, even with the modern calculating machines, are not able to simulate the behavior of the motor in real time. The latter requirement is on the other hand essential for the control oriented applications wich are installed on board of engine electronic control units [4,5]. Clearly, by contrast, the algorithms that do not evaluate the wave effects are certainly fast, but often do not provide results properly accurate. Up to now this problem is avoided with "black box" models, which require a lot of bench tests (which of course must repeat if the engine undergoes any change, even modest). Tthe proposed method tries to combine these needs, to obtain an algorithm fast in the calculation and a sufficiently accuracy in the calculated values(through the introduction of appropriate correction coefficients), and that does not require heavy mapping bench operations.
Effetti d'onda nei motori a combustione interna / TODERI G.; GAMBAROTTA A; ONORATI A. - In: INGEGNERIA DELL'AUTOVEICOLO. - ISSN 2280-8752. - 59 - N 5/6(2006), pp. 36-42.