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The mean methods of improving performance of modern diesel engine include increasing speed, increasing cycle fuel injection quantity, increasing fuel injection pressure and intake boosting technology, so that more fuel quickly mixing with incylinder air in shorter time is requested. For solving these problems, the spray characteristics under the high injection pressure and high ambiance density must...
Determine engine performance of a naturally aspirated direct injection diesel engine fueled with diesel and pungam methyl ester blend (PME20). Comparison of performance was done for different values of compression ratio, injection pressure and injection timing to find best possible combination for operating engine with PME20. It is found that the combined compression ratio of 19:1, injection pressure...
The increase of injection pressure leads to raise the contact stress of tappet roller body and emerge more serious abrasion problem. The study analyzes the movement regulations of cam roller body. The finite element calculations of contact stress on cam-follower with follower rotation are carried out with the FEM software. This study finally gets the distribution regulation of cam-roller and the influences...
With the spray combustion visualization test unit, researches have been made on the spray development process under different injection pressures with STD nozzles, VOC nozzles and IMPROVED nozzles of diesel engines. The result shows that with the rise of injection pressure, the spray cone angle increases slightly, and corresponding to the same injection moment, the penetration enlarges accordingly...
The cavitating flow in nozzle holes is thought to be a very important factor to affect diesel fuel spray characteristics. In order to study the effect of cavitation on the internal flow of diesel nozzle, the 3d numerical simulation of cavitating flow developed fully in holes of a vertical four-hole VCO nozzle with mixture multi-phase cavitating flow model was carried out. The effects of injection...
Electronics has greatly contributed to the development of internal combustion engine. This progress has resulted in reducing environmental degradation, and yet continuing to support improvements in performance. Regarding gasoline engine, a considerable step forward has been achieved by Common Rail (CR) technology able to exactly regulate the injection pressure during whole engine speed range. As a...
This document describes a model-based controller for a high-pressure fuel system on a direct injection engine. This controller drives a high-pressure fuel pump with an inverse pump model and keeps injection pressure under control with a disturbance observer and a proportional (P) controller. The designed controller is a two-degrees-of-freedom control that can improve step response time and nominal...
In this work, the multidisciplinary design optimization (MDO) methodology is applied to a case arising in the automotive engineering in which the design optimization of mechanical and control features of a system are simultaneously carried out with an evolutionary algorithm based method. The system under study is the regulator of the injection pressure of an innovative common rail system for compressed...
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