EAN: 9781447144670

SPRINGERBRIEFS IN ELECTRICAL AND COMPUTER ENGIN...

Progressive reductions in vehicle emission requirements have forced the automotive industry to
invest in research and development of alternative control strategies. Continual control action
exerted by a dedicated electronic control unit ensures that best performance in terms of
pollutant emissions and power density is married with driveability and diagnostics. Gasoline
direct injection (GDI) engine technology is a way to attain these goals. This brief describes
the functioning of a GDI engine equipped with a common rail (CR) system  and the devices
necessary to run test-bench experiments in detail. The text should prove instructive to
researchers in engine control and students are recommended to this brief as their first
approach to this technology. Later chapters of the brief relate an innovative strategy designed
to assist with the engine management system  injection pressure regulation for fuel pressure
stabilization in the CR fuel line is proposed and validated by experiment. The resulting
control scheme is composed of a feedback integral action and a static model-based feed-forward
action  the gains of which are scheduled as a function of fundamental plant parameters. The
tuning of closed-loop performance is supported by an analysis of the phase-margin and the
sensitivity function. Experimental results confirm the effectiveness of the control algorithm
in regulating the mean-value rail pressure independently from engine working conditions (engine
speed and time of injection) with limited design effort.

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