Fuel Injector Flow Rate Analysis for the Duratec 35 EcoBoost Engine

Flow rate characterization for the Duratec 35 EcoBoost engine was conducted at the Powertrain and Fuel Subsystems Laboratory of Ford Motor Company as a key element in the overall calibration for that program. For high-pressure gasoline fuel injection (used in the Direct Injection Spark Ignition [DISI] EcoBoost engine) in which fuel is directly injected in the cylinder, it is important to consider several variables that are not critical for low-pressure fuel injection. In this paper, the effects of fuel pressure, injector pulse width, battery voltage and injection frequency were assessed with respect to injector flow performance (dynamic flow, shot-to-shot variation in mass flow delivery, part-to-part variability in fuel flow, injector delay and split injection performance).