A study on cycle fuel injection quantity variation for a diesel engine combination electronic unit pump system

Abstract

A new fuel injection equipment, combination electronic unit pump was developed to make diesel engines compliant with China's new laws on emissions. Combination electronic unit pump system is a complex assembly constituting of mechanical, hydraulic, and electrical magnetic components. Combination electronic unit pump system includes several electronic unit pumps and mechanical injectors. Cycle fuel injection quantity variation influences product performance and defines its quality of qualification. A numerical model of the combination electronic unit pump system was developed in AMESim environment to create a design tool for engine application and system optimization. Simulated results obtained from this numerical model were validated through experimental tests conducted under the conditions same as numerical model. The results are quite encouraging and consistent with model predictions. Influences of parameters, including variations in supply fuel pressure, cam velocity, plunger-matching clearance, peak control current, anchor residual clearance, valve-matching clearance, valve lift, injector opening pressure, nozzle-flow coefficient, and injector needle lift, on cycle fuel injection quantity variation were analyzed in AMESim simulation environment and verified through experiments. The quantitative percentage indexes of the influence of injector characteristic, valve characteristic, plunger characteristic, and low-pressure supply fuel characteristic parameters on cycle fuel injection quantity variation range from 44% to 34%, 20% to 35%, 32% to 19%, and 4% to 12%, respectively, at a cam rotational speed of 500-1300 r/min.

Comparative Study of Pressure Wave Mathematical Models for Hp Fuel Pipeline of Ceup at Various Operating Conditions

“…Equations (1)(2)(3)(4) are true for following ranges, initial conditions and boundary conditions mentioned in equations (5), (6) and (7) respectively.…”

Analysis Of Diesel And Rapeseed Methyl Ester Properties In Ceup Fuel Pipeline Using Frequency Dependent Damping Model

“…CEUP is an efficient high pressure [1][2][3][4][5][6] fuel injection system used for heavy duty and marine diesel engines. It consists of combination of high pressure pumps, solenoid control units, fuel pipe lines and mechanical injectors.…”

“…It consists of combination of high pressure pumps, solenoid control units, fuel pipe lines and mechanical injectors. CEUP fulfills Chinese strict emission requirements [1] regarding air pollution which is a health risk especially in urban areas [7].…”

Analysis of Key Fuel Properties Inside Combination Electronic unit Pump Fuel Pipeline

“…CEUP meets Chinese strict emission requirements [3] and help in restricting air pollution caused by emissions which is a health risk especially in urban areas [6]. CEUP is a high pressure (HP) fuel injection system and it consists of a combination of pumps, fuel pipelines, injectors and solenoid control units [3][4] [5]. Fuel pipeline between pump and mechanical injector is an important component and impacts in developing and propagating high pressure fuel developed at pump end and injector end [4].…”

“…In an efficient fuel injection system like CEUP it can increase as high as 150 MPa [2][3][4] [5]. CEUP meets Chinese strict emission requirements [3] and help in restricting air pollution caused by emissions which is a health risk especially in urban areas [6]. CEUP is a high pressure (HP) fuel injection system and it consists of a combination of pumps, fuel pipelines, injectors and solenoid control units [3][4] [5].…”