| Abstract: Because of energy crisis and stringent exhaust emission legislations, more emphasis are laid on how to reduce both fuel consumption and emissions. There is a number of ways to achieve this objective on Diesel engine. Out of these methods, Combustion with Diesel/Ethanol compound on Diesel is an effective one. At present ,most of traditional diesel combustion mixed with ethanol installations adopt emulsified fuels or mechanical devices to control the ethanol-fuel proportion, which have some disadvantages, such as unalterable cthanol-fuel proportion, low accuracy of control, etc. The dual fuel electronic injection system in this paper adopts C167CS 16-bit single-chip microcomputer of Infineon company as Micro Control Unit (MCU). According to the signals, including speed, position of fuel-feeding drag link , water temperature, etc, MCU differentiates working conditions of diesel, and then analyze, calculate, and check the data table to get the optimal ethanol-fuel proportion that is sent to PWM to adjust the time of opening ethanol-injection electromagnetic valve to get the needed ethanol-fuel mixture with accurate proportion . The optimal proportions of mixture under different working conditions can be acquired by engine bench tests.The test results in YN4100 Diesel showed that the system could change the proportion of diesel/ethanol according to the working conditions at real time. The system was characterized as better reliability and stability ,accurate ethanol-fuel proportion, fast control response, and accurate data display, can be used to control accurately the amount of ethanol in experiment of the Diesel mixed with ethanol. The result also showed that the Diesel engine mixed with ethanol could not reduce the power and the smoke emissions reduced sharply compared with original engine at middle and high loads;the equal brake specific fuel consumption was close to the original engine at high loads and high speed and superior to the original at middle and low loads.
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