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Research

  • Implementation of Fuel Film Compensation Algorithm on the Lamborghini Diablo 6.0 Engine

    Year: 2001

    Author: Nicolò Cavina, Giorgio Minelli, Massimo Ceccarani

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    This paper presents the experimental work and the results obtained from the implementation of a transient fuel compensation algorithm for the 6.0-liter V12 high-performance engine that equips the Lamborghini Diablo vehicles. This activity has been carried out as part of an effort aimed at the optimization of the entire fuel injection control system.
    In the first part of the paper the tests for fuel film compensator identification are presented and discussed. In this phase the experimental work has been conducted in the test cell. An automatic calibration algorithm was developed to identify the well-known fuel film model X and τ parameters, so as to define their maps as a function of engine speed and intake manifold pressure. The influence of engine coolant temperature has been investigated separately; it will be soon presented together with the air dynamics compensation algorithm. In the second part of the paper, the performance of the fuel dynamics compensation algorithm is analyzed. The measured Air-Fuel Ratio (AFR) distribution, especially during selected portions of the USA driving cycle, has been chosen as a yardstick to evaluate the performance improvement of the new injection control strategy. The experimental tests have been conducted using Lamborghini''s chassis dynamometer laboratory. The comparison between the AFR values, measured before and after the introduction of the new strategy using a linear oxygen sensor, clearly shows the efficiency gain in terms of AFR control due to the transient fuel compensation algorithm.

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  • Thermodynamic Analysis of Variable Valve Timing Infuence on SI Engine Efficiency

    Year: 2001

    Author: Davide Moro, Fabrizio Ponti, Gabriele Serra

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    The large number of mechanical, electro-magnetic and oleo-dynamic systems for variable valve actuation developed by automotive suppliers demonstrates the great interest that is being devoted to their potential application on internal combustion engines.
    In the paper, a possible strategy to realize an original engine load control by means of both intake and exhaust variable valve timing (VVT) is briefly presented and the thermodynamic analysis of the performance obtainable with this solution is carried out. The peculiarity of this strategy is that it is possible to directly recirculate the desired mass of exhaust gas with less limitation with respect to the external duct architecture. To highlight its potentiality this solution has been compared with two different engine architectures:
    a traditional Spark Ignition (SI) engine, where the load control is demanded to the throttle body;
    an engine equipped with a VVT system only on the intake valves, where the load control is performed by means of the well-known Early Intake Valve Closing (EIVC) strategy.
    The proposed engine load control technique shows a relevant efficiency increase at partial load, with respect to both throttled and EIVC engines. The obtained results are certainly overestimated, due to the theoretical thermodynamic approach used to compare the different engine architectures, but the relevant efficiency increase shown in the paper seems to leave a good possibility to find in real experimentation a still appreciable improvement with respect to a throttled engine.

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