Development and Validation Procedure of a 1D Predictive Model for
Simulation of a Common Rail Fuel Injection System Controlled with a Fuel
Metering Valve 03-11-04-0027
This also appears in
SAE International Journal of Engines-V127-3EJ
A fully predictive one-dimensional model of a Common Rail injection apparatus for
diesel passenger cars is presented and discussed. The apparatus includes
high-pressure pump, high-pressure pipes, injectors, rail and a fuel-metering
valve that is used to control the rail pressure level.
A methodology for separately assessing the accuracy of the single submodels of
the components is developed and proposed. The complete model of the injection
system is finally validated by means of a comparison with experimental
high-pressure and injected flow-rate time histories.
The predictive model is applied to examine the fluid dynamics of the injection
system during either steady-state or transient operations. The influence of the
pump delivered flow-rate on the rail-pressure time history and on the injection
performance is analysed for different energizing times and nominal rail pressure
A comparison between fuel metering valve and pressure-control-valve strategies is
also carried out in terms of rail pressure and pump delivered flow-rate time
histories. The advantages and the weak points of each strategy are highlighted:
the fuel metering valve control is more efficient, due to the absence of a
throttling of high-pressure fuel, but leads to poorer dynamic response during
nominal rail pressure transients.
Even though the injection performance is the same under steady-state working
conditions, significant differences between the two strategies can occur during
Citation: Ferrari, A., Pizzo, P., and Vitali, R., "Development and Validation Procedure of a 1D Predictive Model for Simulation of a Common Rail Fuel Injection System Controlled with a Fuel Metering Valve," SAE Int. J. Engines 11(4):401-422, 2018, https://doi.org/10.4271/03-11-04-0027. Download Citation
Alessandro Ferrari, Pietro Pizzo, Ruggero Vitali
Politecnico di Torino
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