Diesel engines are important and effective in many services, but it is no friendly for environmentally. Since liquefied petroleum gas is prolific in Iraq at a lower price than other fuels and is clean and environmentally friendly, one of the important research topics is the use of liquefied petroleum gas in diesel engines because LPG has a high heat value, and the state of its gas makes mixing with air a burning issue simple and improved, reduces emissions and helps to harvest total energy. A new electronic control unit (ECU) is designed and used to inject liquefied petroleum gas via intake manifold as air enters the combustion chamber and a sensor is installed over a single-cylinder diesel engine, air-cooling. The test engine operation for fuel modes that were initially used is the D- 100, after which the LPG-25, LPG-50 and LPG-100 fuel were used. The test under loads was 0%, 25%, 50%, 75% and 100% at different speeds of 1000, 1500 and 2000 rpm. At engine speeds, 1000, 1500, 2000 rpm compared to D- 100 fuel, thermal efficiency was better in using LPG-50 fuel and improved by (4%, 3.6%, 4.9 %), and bsfc (9.81%, 9.4% and 9.68%) respectively, A decrease in emissions, NO x , HC, CO and CO 2 was observed in all operating modes with liquefied petroleum gas and the best emission reduction situation is LPG -50.
Keywords: Dual fuel, diesel engine, liquefied petroleum gas, emissions.
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