The dynamic injection characteristics of high-pressure common rail fuel systems are determined by the speed response performance solenoid valve. A simulation model has been established for investigating influence mechanism and change law characteristic parameters on valve, including average opening speed, closing maximum caused changes such as pre-tightening force valve spring, mass moving parts, diameter outflow orifice, inflow control piston, pressure in rail, have studied. correlation...

High pressure common rail system is the state-of-the art technology for modern diesel engines to achieve energy conservation and emission reduction. The economy performance of are influenced by fuel injection stability high system. In this work, a injector numerical model based on bond graph theory has been proposed. comparisons between experimental results simulations show that could reasonably predict characteristics order reveal essential rules inherent system, rank variations state...

Various traffic-sensing technologies have been employed to facilitate traffic control. Due certain factors, e.g., malfunctioning devices and artificial mistakes, missing values typically occur in the Intelligent Transportation System (ITS) sensing datasets, resulting a decrease data quality. In this study, an integrated imputation algorithm based on fuzzy C-means (FCM) genetic (GA) is proposed improve accuracy of estimated values. The GA applied optimize parameter membership degree number...

It is critical to discover the behavior of piston wind induced by a braking train in tunnel, but there little research on theoretical derivation for behavior. Predicting as an unsteady airflow formula hard work due complexity running states and fields. Herein, we develop mathematical model investigate airflow, considering variation direction annular area. In general, validated experiments. However, experimental studies about are scarce. this study, simulated emergent process validate...

A rescue station is necessary for an extralong railway tunnel, whose length generally greater than 20 km. In the station, passenger evacuation, fire fighting, and protection of passengers are organized. It important to discover temperature distribution in a where train on fire. This paper performs similarity simulation model test at 1 : 10 geometric scale investigate field station. gasoline pool was used as source. The influences source position ventilation condition were studied. results...

Variations in the parameters affect injection characteristics of a common-rail system and leads to fluctuation fuel quantity. This paper is aimed at combining numerical modelling design experiments investigate significant effects interactions between injector on quantity using response surface methodology. A model was developed. The validated by comparing simulation results with experimental measurements, which showed that it can accurately predict system. performed two-level five-factor...

abstract High pressure common rail (HPCR) fuel injection system is the main development trend for of diesel engine. Precise controlling and multiple injections are advantages key features HPCR system. Affect pilot quantity (PIQ) pilot-main interval (PMI) on fluctuation (MIQF) has been investigated in this paper by evaluating performance coherence stability A numerical model AMESim environment. Predicting accuracy validated comparing its results with experimental data. The show that triggers...

The coherence of the fuel injection quantity determines working stability common rail system. variations in parameters injector have significant influence on bond graphs for main components were proposed, respectively, based graph methodology this article. quantities system at different pressures and pulse widths had been obtained by numerically solving programming state equations MATLAB. predicted results model are excellent agreement with experimental measurements which from a test bench....

Maritime transport has made great contributions to the prosperity and development of world economy. And low-speed marine diesel engine played an important role. However, with aggravation energy shortage pollution, engines is facing unprecedented pressure. It therefore urgent improve performance fuel system engine. In this study, a simulation model for was established. accuracy validated because good agreement between experimental data results pressure characteristics. Based on verified...