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Reliability, main mailfunctions and causes of failures of high pressure pumps in accumulator fuel systems of diesel engines
Engineering Education # 09, September 2012
DOI: 10.7463/0912.0453572
Development of high pressure fuel pumps for Common Rail (CR) was not in the focus of studies until 1997.In fact, problems of efficiency, resource, cost and simplicity were significant. In this paper much attention is paid to malfunctions of the plunger drive in CR high pressure fuel pumps. The authors consider the question of using desaxial in CR high pressure fuel pumps. The authors give the main results of studying the desaxial cam gear pump system of immediate action. In it the desaxial significantly affects reliability. As of today, there are no evidence-based recommendations for selection of desaxial value in CR high pressure fuel pumps. The authors prove the relevance of research of desaxial eccentric mechanism used in them; the authors specify requirements for safety of CR high pressure fuel pumps and describe the main malfunctions and their causes.
Use of heat insulators for reparation, maintenance and modernization of diesel fuel injection equipment. Goal setting, selection and research methods.
Engineering Education # 08, August 2012
DOI: 10.7463/0812.0452551
The article presents a review of previous studies on thermal effects during fuel injection. It was found out that the most important is fuel heating as a result of heat supply from the walls of the fuel pipe and due to compression. As of today, no one has studied yet the degree and causes of heating of fuel pipe walls during a benchmark testing of diesel engines and during operation in the engine compartment. It is not known to what extent this is affected by heating of the fuel system when heat comes from other parts of the and from hot air around it. The authors suggest that during the use of diesel in the engine compartment fuel heating will be higher than during benchmark testing of the diesel engine. This paper shows what solutions are used to reduce fuel heating in diesel and gasoline engines to date. The authors propose to study the possibility of applying insulating materials in order to reduce fuel heating in the fuel system of a diesel engine.
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