FLOW RATE ESTIMATION FOR PIEZO-ELECTRIC FUEL INJECTION
Improving tradeoffs between noise, fuel consumption, and emissions in future diesel engines are facilitated by the development of increasingly flexible fuel injection systems which can deliver more complex injection profiles. Piezoelectric injectors have the ability to deliver multiple, tightly spac...
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Zusammenfassung: | Improving tradeoffs between noise, fuel consumption, and emissions in future diesel engines are facilitated by the development of increasingly flexible fuel injection systems which can deliver more complex injection profiles. Piezoelectric injectors have the ability to deliver multiple, tightly spaced injections in each cycle. Closed-loop control is useful for this technology, and is assisted by on-line estimation of the injected fuel flow rate to be realized. Estimator results are compared against both open-loop simulation and experimental data for a variety of profiles at different rail pressures, and show improvement, particularly for more complex multi-pulse profiles. Internal states of the estimator are used to evaluate pulse-to-pulse interaction phenomena. Some embodiments include the use of estimations of actual transient fuel pulses, and the use of such estimations to achieve closed-loop control of the quantity of fuel injected in a pulse, and the dwell time between adjacent fuel pulses. |
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