Diesel gas dual engine with liquid LPG injection into intake manifold

Abstract

Abstract. This paper presents an experimental research on the fuel control system which is installed on the diesel engine Cummins to assess the technical characteristics and emissions, when the engine is using dual fuel liquid LPG-Diesel with different ratios of LPG. The experimental results show that the engine running dual fuel LPG -Diesel reached 96 % maximum moment. Average torque and average power were reduced, but not significantly compared to the case of the engine using 100 % diesel. The percentage of the alternative LPG fuel could be reached by 60 %. For engine using dual fuel, the concentration of CO 2 and particle concentration are decreased.Keywords: dual engine, diesel, LPG, exhaust emission. IntroductionThe dual compression ignition (CI) engine (LPG gas and diesel) is operated simultaneously on diesel and LPG. This engine has some specific features against the diesel engine, e.g., the engine can only be started on diesel and can only be converted to dual operation after short-term engine warm-up. In dual operation, the dual engine control system must regulate the gaseous fuel dose and the injected diesel dose, so that the combustion course of the homogeneous LPG-air mixture has a sufficient reserve against detonation burning (so-called "knocking"). The risk of "knocking" increases with the increasing richness of the LPG and air mixture and decreases, when the temperature of the intake mixture to the engine is reduced. Injection of liquid LPG into the pipeline behind the charge air cooler (coupled with cooling the mixture) allows for increased LPG share in dual engine operation. With a greater reduction in the fuel injected, an additional risk of dual engines is overheating of the injection nozzles: the dual-engine control system must therefore ensure reliability of operation also from this point of view.

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