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The automotive industry is continuously developing technologies and strategies for increasing the efficiency in fuel consumption and reducing the emission of pollutants. The variable valve timing (VVT) system provides such a solution for internal combustion engines. Researches in this area are mainly devoted both to improved layouts and to new operation control techniques. To this aim, modeling, identification...
Common rail injection systems in innovative gas engines require an accurate control of the rail pressure dynamics. This task is, in fact, combined with a precise setting of the opening/closing time intervals of electro-injectors to achieve a satisfactory metering of the ratio between gas and air, then a good performance that reduces pollution and consumption. To achieve a trade-off between model accuracy...
Common rail injection systems of compressed natural gas (CNG) engines require robust control, because of large variations in their parameters and working conditions and because of their highly nonlinear behavior. This paper shows that a noninteger (fractional) order PI (or FOPI) controller, designed by a loop-shaping approach, improves robustness to parameter variations and guarantees an optimal performance...
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