Considerations regarding the influence of inappropriate electronic throttle unit operation on pollutant emissions of internal combustion engines

Study of control and stability of diesel engine operation using fractional calculus

“…Therefore, in this case the fractional controller ensures the best dynamic engine performance. Comparing the relations (17) with the expression C(s) in figure 7c, results the parameters of the controller established by the Ziegler-Nichols algorithm: 0.2168 ; 9.1994 ; 0.0388 ; 1.029 ; 0.185…”

“…In this sense, the aim is to optimize fuel consumption, respectively minimize it provided that the dynamic performance (here through engine power) decreases by no more than 4%, this being an additional restriction for the algorithm. Thus, figure 9 shows the deduction of the mathematical model that provides the values of the hourly fuel consumption Ch as a function of the position of the accelerator pedal p, through the transfer function G(s) [2,17]. As a result, figure 9 shows the fractional differential equation of the order of 1.2: Figure 10 shows the results of applying the optimal control algorithm.…”

Signal-based diagnostics of the gasoline injection engine

“…For this purpose, the following are used for quantitative or qualitative assessments: first-order statistical characteristics (mean value, variance, standard deviation, entropy, and so on), monospectral (Fourier transform) or bispectral (higher order cumulants), frequency analysis, time-frequency analysis (spectrogram, Cohen class transforms, Stockwell transform, wavelet transform, and so on), cyclostationary analysis (frequency-frequency), probabilistic methods (Bayesian techniques / Bayesian decisions), detection of sudden / abrupt variations etc. As can be seen, these methods do not require mathematical models of gasoline engine operation (as in model-based diagnostics), but involve the existence of constructive elements that provide values of those variables and this aspect shows the increased role of sensors and actuators in engine diagnostics [2,3,6,7]. As noted, signal-based analysis applies to time domain, frequency domain, time-frequency domain, and frequency-frequency domain.…”

Diagnosis of Gasoline Injection Engine and Fault Tolerant Control

“…It can therefore be said that the FTC is a set of control techniques that ensure the ability of a system to meet the proposed objectives despite the occurrence of faults [1], [2], [4], [7]. Subsequently, the algorithm was refined, appearing the diagnostic solution by reconfiguring the control [8], [10]. In the sense of those presented, it is necessary to mention the definitions of some notions with which the diagnosis operates.…”