Abstract
The paper report on the state of affairs so far in the scope of internal diesel injection deposits (IDID) issue affecting modern diesel high pressure common rail (HPCR) systems. Different types of deposits have been described and the factors supporting their creation. These deposits have been extensively studied to understand their formation mechanisms and composition. To this end an engine test procedure was developed to assess the deposit forming tendencies of various types. Findings of two long time dynamometer engine tests in which the course of the IDID formation and HPCR performance impairing was followed by measurement different engine parameters have been reported. Performance evaluation of HPCR injectors before and after tests have been presented also.
Highlights
Expansion of diesel engines with direct fuel injection in the late 90’s of the last century brought about rapid development in high-pressure injection systems out of which in the following years the largest popularity has achieved the system of HPCR type (High Pressure Common Rail)
While in diesel engines with indirect fuel injection the amount and rate of coke formation were widely influenced by the type of injector used, in case of direct fuel injection it is the fuel that plays the key role in formation of the subject coke deposits
It was found that the factors causing formation of this new group of deposits, called internal diesel injector deposits (IDID), and conditions promoting their growth are utterly different from those influencing formation of external coke deposits – see Fig. 1
Summary
Expansion of diesel engines with direct fuel injection in the late 90’s of the last century brought about rapid development in high-pressure injection systems out of which in the following years the largest popularity has achieved the system of HPCR type (High Pressure Common Rail). In case of those systems, to earlier types of fuel injection systems, appeared the problem of external coke deposits accumulating in the ducts and around outlet holes of multihole nozzles. It was found that the factors causing formation of this new group of deposits, called internal diesel injector deposits (IDID), and conditions promoting their growth are utterly different from those influencing formation of external coke deposits – see Fig. 1
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