2000 bar Diesel Common Rail by Bosch for passenger cars

Leonhard, Rolf; Warga, Johann

doi:10.1007/bf03226917

Cited by 9 publications

(1 citation statement)

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“…The opening and closing of the injection nozzle needle are realized by the controlling the solenoid armature and hydraulic pressure inside the injector. 2–4 The design of the injector has a big impact on the fuel spray and in cylinder mixture preparation, and the effectiveness of combustion consequently. Engineers have been trying to design injectors that can better minimize the pressure loss of the fuel flow and convert the liquid fuel to finer fuel sprays.…”

Section: Introductionmentioning

confidence: 99%

Flow analysis of a control ball valve in a common rail fuel injector

Miao,

Chang,

Zheng

et al. 2023

International Journal of Engine Research

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The electronic control common rail fuel injection system is one of the key technologies being used in modern diesel engines to improve the engine performance. A numerical simulation was conducted to study the characteristics of the fuel flow around the ball valve in the common rail fuel injector. The lift of the control ball valve and static pressure of the flow field around the control ball valve were measured respectively. The simulation was performed with the measurements as boundary conditions such that the flow characteristics can be correlated with the valve lift and the pressure upstream of the ball valve. Simulation results showed that during the valve opening and closing, a high pressure area appeared below the ball valve, while cavitation appeared in the area around the control ball valve. Specifically, the cavitation mainly appeared around the sealing circle, and its upstream area and the conical surface from the entrance to a certain distance downstream. The flow throttling happened at the outlet orifice under the steady-state condition when the valve was at the maximum opening position. The cavitation around the control ball valve was more serious under higher rail pressure conditions. The formation and development of the cavitation was found to be depending on the lift position of the ball valve and pressure of the flow around the ball valve during the valve opening and valve closing. Higher value of void fraction appeared in the flow when the lift of the ball valve was at a larger opening position. It was found that cavitation around the ball valve will affect the consistency and stability of the fuel flow. And cavitation erosion found at the valve seat from a simplified durability test appeared to be close to the place where cavitation appeared from simulation. Therefore, it is suggested that simulation work can be used to examine if cavitation occurs in the flow path of the control ball valve inside the injector in design phase and make necessary changes on the design to prevent the cavitation and the resulting damages to the control ball valve in the injector.

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Section: Introductionmentioning

confidence: 99%

Flow analysis of a control ball valve in a common rail fuel injector

Miao,

Chang,

Zheng

et al. 2023

International Journal of Engine Research

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Diesel Fuel Injection Systems

Nanjundaswamy¹,

Laumen

2014

Encyclopedia of Automotive Engineering

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Diesel engines work on the compression ignition principle, where the fuel is injected into compressed air inside the cylinder. Since the invention of the diesel engine, the diesel fuel injection systems have played a crucial role in defining engine operation. Over the decades, the advancements in fuel injection in conjunction with engine hardware components paved the way for diesel engines to exemplify high efficiency and clean combustion. With emphasis on precise fuel injection, better atomization of fuel to improve combustion, multiple injection, and precise control with electronics, the diesel fuel injection systems have come a long way evolving to meet every challenge that was posed. This chapter begins with a brief review of historic development of diesel fuel injection and discusses the state‐of‐the‐art common rail electronic diesel control system and its features.

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