Effect of PIBSI Chemical Structures of Various Molecular Masses on the IDID Formation in Engine-Dynamometer Testing

Abstract

This paper presents the results of simulation engine test bed tests on the impact of diesel fuel additives. These hold detergent properties in the form of polyisobutylene succinimide (PIBSI) chemical structures of various molecular masses, and the intent is to assess the effect of these on the formation of internal diesel injector deposits (IDIDs). The work focused on products with masses ranging from 2000 to 4000 Da (daltons). In addition, contrary to similar papers in which the molecular mass was increased via changes of polyisobutylene (PIB) anhydride, the molecular mass was controlled by means of amine weight and additive structure changes by attaching other PIB chains to the detergent molecules. Moreover, less harsh test conditions, closer to the actual engine operation, were adopted in the tests. The outcome of the project implementation suggested, among other things, that in the case of diesel fuel additives synthesized for the project objectives, as PIBSI substances, their molecule mass affects the formation of organic polymer amide IDID-type deposits in fuel injectors of a diesel engine fueled with diesel fuel.