Papers by giancarlo chiatti
The control of combustion is a key topic for diesel engine development in terms of performance an... more The control of combustion is a key topic for diesel engine development in terms of performance and pollutant emissions. The combustion process is piloted through the proper injection strategy, which depends on the features of the injection system. Mechanical-hydraulic models of high-pressure injection systems often support the accurate tuning of the injection strategy. The higher is the accuracy in the modeling of the electro-injector behavior, the deeper is the role of the simulation. Under such a viewpoint, the validation of the models is undoubtedly fundamental. One of the most crucial information characterizing the injector relies on the measurement of the needle displacement. Needle displacement affects rate, timing and quantity of injected fuel; it also influences the flow features within the nozzle, which are then reflected by the primary atomization process. Needle is considered hardly-accessible due to the injector architecture itself, making difficult the measurement of displacement. Nevertheless, the problem has been handled in different ways and three measurement techniques have been proposed. On one side, there is the measurement based on eddy-current transducers; on the other side, there are two alternative procedures, based on the use of optical sensors. However, in all cases, the needle is traced indirectly, since the position of the control plunger of the needle is observed. The current contribution presents a novel experimental technique for the measurement of needle displacement. The method is based on the direct visualization of the needle, allowing for the detailed definition of its law of motion through digital imaging, when the injector is characterized on a test-rig under transient conditions. The paper describes the details of the diagnostic scheme, the experimental facility and the digital imaging set-up. The main features and the capabilities of the method are discussed, in comparison with the other available techniques.
Applied Energy, 2017
Investigation on the impact of UCO bends on the engine vibro-acoustic behavior. The engine is mai... more Investigation on the impact of UCO bends on the engine vibro-acoustic behavior. The engine is mainly used in micro-cars in urban areas. Data analysis to select the vibration/acoustic components related to the combustion. Indicators used to evaluate the effect of blends on vibration and noise radiation.
Design, Application, Performance and Emissions of Modern Internal Combustion Engine Systems and Components, 2003
ABSTRACT
Energy & Fuels, Jul 15, 2014
h i g h l i g h t s Twelve terpenes were tested as pure fuels in a direct injection diesel engine... more h i g h l i g h t s Twelve terpenes were tested as pure fuels in a direct injection diesel engine. The terpenes are potential products of a genetically engineered cyanobacteria. Molecular structure of the terpenes impacted significantly on ignition quality. Four terpenes were tested as diesel and gasoline extenders up to 60% terpene. Terpene toxicity to the suggested producing cyanobacteria was also assessed.
Turbochargers are widely used in automotive industry to enhance the engine power output without t... more Turbochargers are widely used in automotive industry to enhance the engine power output without the need to increase the engine displacement, thus allowing the adoption of smaller powerful engines. This paper presents a development of a naturally aspirated small displacement diesel engine, a light and compact engine that has a leading role in micro-cars in urban areas. The engine was equipped with a small turbocharger in order to improve its power output with the objective of letting this engine equip not only microcars but also urban vehicles. The engine operative range was extended aimed at including engine speed values where the turbocharger has the positive effect of increasing the engine volumetric efficiency. An experimentation was performed in the complete engine operative field of both naturally and turbocharged configurations. The engine performance and emissions were analyzed. The impact of engine configuration on the total number and size distribution of particle emission...
SAE Technical Paper Series, 2020
SAE Technical Paper Series, 1989
SAE Technical Paper Series, 2003
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Papers by giancarlo chiatti