Abstract
The paper describes a Diesel fuel injection process. Computer simulation was carried out together with measurement of the Common Rail accumulator fuel-injection system. The computer simulation enables the observation of the phenomena from rail pressure, being the input data for injection parameters calculations, to the injection rate. By means of computer simulation, the pressure values in specific sections of the injection nozzle may be computed, the needle lift, injection rate, total injected fuel, time lag from injector current to first evidence of injection process and other time-lags between various phases of the injection process. The injection rate provides input data for spray computer simulation. Measurements of injection and combustion were carried out within a transparent research engine. This engine is a single-cylinder transparent engine based on the AUDI V6 engine, equipped with a Bosch Common Rail Injection System. The comparison between the computed and measured injection parameters showed good matching.
Highlights
Diesel engines are primarily used in heavy- and medium-duty transport due to their high thermal efficiency whilst in over recent decades they have been increasingly used in passenger cars
In order to obtain efficient combustion, which is a pre-condition for low consumption and reduced pollution of the environment, it is very important to understand the fuel injection process
This paper described computer simulation of the Common Rail accumulator fuel-injection system
Summary
Diesel engines are primarily used in heavy- and medium-duty transport due to their high thermal efficiency whilst in over recent decades they have been increasingly used in passenger cars. Combustion is one of the most important processes, influencing lower consumption and reduced pollution of the environment by diesel engines. We have developed a computer simulation of the common rail accumulator fuel-injection system This computer program enables computation of the injection parameters from the electric current at the triggering element (solenoid valve) to the injection rate. The input data for the injection parameter computation is the pressure in a high-pressure accumulator (rail) (Figure 6), electric current at the triggering element (solenoid valve) and combustion pressure (Figure 5). The comparison between the computed and the measured fuel injection parameters, showed good agreement
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