Abstract
In the paper are discussed test results of dual fuel spark ignition engine with multipoint injection of alcohol and gasoline in area of inlet valve. Engine fuelling was accomplished through a prototype fuel supply system comprising duplex injectors controlled electronically. Implemented system enables fuelling of the engine with pure gasoline, with pure methanol, or simultaneous combustion of the both fuels mixture with any fraction of the alcohol. The tests were performed on four cylinder, spark ignition engine of Fiat 1100 MPI type. In the paper are presented criteria to be fulfilled in dual fuel spark ignition engine run on gasoline and methyl alcohol. The criteria were developed on the base of engine testing performed on engine dynamometer. When developing the criteria, one took assumption of energetic equity of fuel doses in traditional and dual fuel supply system in every operational point of the engine. The second criterion consisted in maintaining a minimal elementary dose of gasoline and alcohol injectors, which would assure stable operation of the engine. In result of the performed analysis one proposed a map of possible ranges of dual fuel feeding of the engine with methyl alcohol and gasoline.
Highlights
The first usable combustion engine was constructed by Étienne Lenoir in the year 1860 [17]
Among obvious advantages of this system, one should specify a possibility of engine start-up on pure gasoline, and its subsequent operation on any fractions of the both fuels, depending on engine rotational speed and load
The experimental results and discussion The tests of the engine operated with dual fuel supply system were performed with 20, 40, 60, 80 and 100 % fractions of methyl alcohol, calculated energetically in complete field of engine operation, i.e. for range of engine rotation speed of 1500–5000 rpm and change of engine load from minimal to maximal one
Summary
The first usable combustion engine was constructed by Étienne Lenoir in the year 1860 [17]. More than 150 years have been passed since this event and during this period of time the engine became an object of permanent improvements, conformed to petroleum-based fuels mainly. During considerable amount of this time the engine was developed in direction of improvement of its performance. A third direction has emerged as a significant issue of engine development, forced by necessity of natural environment protection, putting emphasis on reduction of toxic emissions of exhaust gases, like carbon oxide, hydrocarbons, nitrogen oxides and solid particulates. Not without a meaning is emission of carbon dioxide, not toxic, but having substantial effect of creation of the greenhouse effect. Having expectations formulated in such way, more and more heed is focused on search after alternative fuels, which would be not pro-ecological only, and competi-
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