Influence of ball-seat contact on the noise emissions from common-rail pump outlet valve opening

8th International Conference on Advanced Concepts in Mechanical Engineering

Petrea, N.D.^1 ; Bujoreanu, C.^1 ; Ripanu, I.E.^2

Mechanical Engineering, Mechatronics and Robotics Department, Gheorghe Asachi Technical University of Iasi, Iasi, Romania^1

Machine Manufacturing and Industrial Management, Machine Manufacturing Technology Department, Gheorghe Asachi Technical University of Iasi, Iasi, Romania^2

关键词: Agricultural machine;    Common rail system;    Common-rail high pressure fuel pump;    Experimental investigations;    High pressure;    High-pressure direct injection;    Indirect injections;    Noise emissions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/444/4/042012/pdf
DOI  :  10.1088/1757-899X/444/4/042012

来源: IOP

【 摘 要 】

Nowadays, most engines which equip agricultural machines, ships and cars are diesel ones with a common-rail high-pressure direct injection system. They are providing the advantages of fuel economy, low emission level, and reduced noise in comparison to conventional direct or indirect injection systems. The heart and the most stressed part of the common-rail system is the high-pressure fuel pump which is driven by the engine camshaft, and its role key is to compress the fuel at pressures over 2000 bar. The high-pressure fuel is delivered from pump to the engine combustion chamber via high rail pipes, high-pressure accumulator (rail) and injectors. Compressing the fuel and sending it towards high-pressure accumulator (rail), in some specific cases the pump generates an audible disturbing noise that gets louder than the engine combustion noise. The paper first offers an overview of our experiments performed on common-rail high-pressure fuel pumps in order to find the noise contributor and to develop measures to reduce the disturbing noise. The experimental investigations have proved that the noise occurs when the fuel is compressed and the outlet valve is opening. Then, our experimental study focuses on outlet valve behaviour from design and noise emissions point of view at idle engine speed.