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Analysis of Transient Response of Diesel Fuel Injection Systems
Published September 28, 1995 by Institution of Mechanical Engineers in United Kingdom
A transient injection rate test rig was used to characterize the dynamic response of fuel injection systems for HSDI diesel engines. Experiments were performed, to analyze the transient response of a VE type distributor injection pump, high pressure line and nozzle by measuring the instantaneous line pressure, line residual pressure, needle lift and injection rate for two test cases corresponding to: a) transient fueling conditions, where the speed control lever position was changed in a step function from the minimum to the maximum position and b) transient speed conditions, where the pump speed was varied over a wide range similar to that of the engine under actual operation. The transient results were compared to the corresponding steady state for all test cases examined. The transient response time constant of the system was estimated as a function of pump speed and pre-transient injected fuel quantity and conclusions were drawn about the correlation between the transient load speed injection mode and the critical parameters characterizing fuel injection.