IŶterŶatioŶal CoŶfereŶĐe oŶ EŶergy EffiĐieŶt TeĐhŶologies For Autoŵoďiles ;EETA’ 15Ϳ Journal of Chemical and Pharmaceutical Sciences ISSN: 0974-2115 JCHPS Special Issue 6: March 2015 www.jchps.com Page 288 VARIATION OF GASEOUS FUEL FLOW RATE IN A DUAL-FUEL DIESEL ENGINE USING FUZZY LOGIC V. Abhjith, K.Somasundaram, U.B.Gokulraj*, B.Ashok, S.Denis Ashok, C.Ramesh Kumar School of Mechanical and Building Sciences, VIT University, Vellore, TN, India *Corresponding author: Email: gokulshr@gmail.com. ABSTRACT Reduction of emission from the engine is a very difficult task these days since emission norms are becoming very strict on NOx, HC, CO etc. Special methods should be incorporated into the engines to have such emission standards. Here dual fuel diesel engine which use liquefied petroleum gas (LPG) and diesel fuel is suggested for better HC values in the emission. Proposed system uses a Fuzzy logic based controller to control the LPG flow into the engine and diesel as a pilot fuel which is only used to ignite the fuel. Also, EGR system will reduce the NOx content in the exhaust. Both EGR and LPG are controlled by a fuzzy closed loop control system. Keywords: Emissions, Dual Fuel, liquefied petroleum gas (LPG), Flow Rate, Fuzzy Logic, EGR INTRODUCTION The recent, highly serious problem in the world is the environmental pollution by automobile industry. It is a major issue which prevents the development of the industry. The governments are put forward with stringent emission standards to reduce pollution by the automobiles. NOx, HC, CO etc. are the main hazardous elements in the exhaust gas from the vehicle. And these elements create environmental issues and at the same time, it reduces the engine performance also. Researches were always ON to rectify the effect of these elements to reduce emission as well as to increase the performance of the automobiles. LPG is the one of the promising fuel, which can be used instead of gasoline and diesel. LPG has the more calorific value than diesel and its burning produce lesser HC content than diesel. Because of the high calorific value fuel consumption will be comparatively less with diesel, giving more fuel efficiency. The main agenda of industry ever was making existing petrol and diesel engine a LPG compatible one.SI engine can be easily converted into LPG engine without any major changes in the whole system. But it is not that easy to make CI engine a pure LPG engine. Electronic control is best suit for such controlling applications, in fact various P, PI, PID controllers already implemented in many ECU in the automobiles. Such controllers need very tedious tuning to get the required output. The fuzzy controllers are good replacement for such conventional controllers. The fuzzy system is a knowledge based expert system which is developed from the existing experience and practical knowledge. It mainly consists of three parts viz. fuzzy inference system, rule base and defuzzification. Simulink model of diesel engine is developed which considers the engines dynamic model using the mathematical relationship. The mamdani fuzzy controller is developed in Matlab is used to control the LPG flow and EGR according to the engine load viz Fuzzy inference system, rule base and defuzzification. Proposed system: An existing diesel engine can be converted into dual-fuel diesel engine by a slight modification as shown as block diagram in Fig.1. Diesel flow is controlled by the governor in the engine. So to convert into a dual fuel engine, only LPG flow should be controlled. For that a fuzzy controller is used as shown in the block diagram. Fig.1.Block Diagram of the Experimental Setup The control system have load as input parameter and the output parameters are LPG valve control, EGR valve control and pre-heating temperature. Based on the variations in the load conditions the three output variables