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1

Diagnosing the thermostat using vehicle on-board diagnostic (OBD) data

Witaszek Kazimierz, Witaszek Mirosław

Diagnostyka

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2023

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Vol. 24, No. 4

art. no. 2023402

EN

The thermostat is a crucial component of a car's internal combustion engine's cooling system. Failure of the thermostat can result in undercooling or overheating of the engine. Undercooling may increase wear of engine components due to poor lubrication and lead to higher fuel consumption. Conversely, overheating can damage the engine. The engine coolant temperature is one of the fundamental parameters for the proper functioning of the engine. The vehicle's onboard diagnostics system was unable to detect the malfunction of the thermostat. As a consequence, fuel consumption increased, which was especially noticeable in winter. This paper evaluates the possibility of carrying out thermostat diagnostics using data obtained from the OBD system through a diagnostic interface ELM327, which is connected to the OBD-II connector and interfaced with Torque Pro software on a smartphone. Analysis of the data confirmed that the proposed diagnostic method was appropriate. Furthermore, the impact of the thermostat malfunction on different factors such as coolant temperature, cold engine warm-up time, parameters characterising thermostat cycling, and fuel consumption of the car were studied. It was found that, apart from the already mentioned decrease in coolant temperature, the thermostat hysteresis also decreased and the thermostat cycle time increased.

2

The heat-transfer system modelling of the convective heating surfaces of a TP-92 steam boiler

Kravets Taras, Galyanchuk Igor, Yurasova Oksana, Kapustianskyi Andrii, Romanova Kateryna

Polityka Energetyczna

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2022

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T. 25, z. 3

5--20

EN

The relevance of the subject of research is determined by the need to develop and subsequently implement a mathematical model and the corresponding structural scheme of the convective heating surfaces of the TP-92 steam boiler. The purpose of this research work is to directly model the heat- -transfer system of the convective heating surfaces of this boiler, designed for effective use in real conditions. The basis of the methodological approach in the research work is a combination of methods of the system analysis of the key principles of constructing mathematical models of heat-transfer systems of modern steam boilers with an experimental study of the prospects for creating a mathematical model of a heat-transfer system of the convective heating surfaces of a TP-92 steam boiler. In the course of the study, the results were obtained and presented in the form of a mathematical model of a convective heat-transfer system. It allows for making effective mathematical calculations of the main operating modes of the TP-92 steam boiler and calculating the dependences of the temperature and thermal modes of its operation on the change of incoming parameters of the used heat carriers, changes in the heating surface area and the relative flow rate of the heat carriers over the time of their use. The results obtained in the study, including the conclusions formulated on their basis, are of significant practical importance for the designers of steam boilers. The results also are useful for maintenance personnel, whose immediate responsibilities include determining the real possibilities of improving the convective heat-transfer system, based on the known parameters of the temperature of the coolant at the entrance to the system and at the exit from it.

PL

O trafności przedmiotu badań decyduje potrzeba opracowania, a następnie wdrożenia modelu matematycznego i odpowiadającego mu schematu konstrukcyjnego konwekcyjnych powierzchni grzewczych kotła parowego TP-92. Celem pracy badawczej jest bezpośrednie zamodelowanie układu wymiany ciepła konwekcyjnych powierzchni grzewczych tego kotła, zaprojektowanego do efektywnego wykorzystania w warunkach rzeczywistych. Podstawą podejścia metodologicznego w pracy badawczej jest połączenie metod analizy systemowej kluczowych zasad budowy modeli matematycznych układów wymiany ciepła nowoczesnych kotłów parowych z eksperymentalnym badaniem perspektyw stworzenia modelu matematycznego układu wymiany ciepła konwekcyjnych powierzchni grzewczych kotła parowego TP-92. Uzyskane wyniki zaprezentowano w postaci modelu matematycznego konwekcyjnego układu wymiany ciepła. Pozwala to na wykonanie efektywnych obliczeń matematycznych głównych trybów pracy kotła parowego TP-92 oraz obliczenie zależności temperatury i trybów cieplnych jego pracy od zmian parametrów wejściowych stosowanych nośników ciepła, zmian powierzchni grzewczej oraz względnego natężenia przepływu nośników ciepła w czasie ich użytkowania. Uzyskane w pracy wyniki, w tym sformułowane na ich podstawie wnioski, mają duże znaczenie praktyczne dla projektantów kotłów parowych. Są one również przydatne dla personelu utrzymania ruchu, do którego bezpośrednich obowiązków należy określenie realnych możliwości udoskonalenia konwekcyjnego układu wymiany ciepła, w oparciu o znane parametry temperatury chłodziwa na wejściu do układu i na wyjściu z niego.

3

Internal combustion engine cooling system with elevated coolant temperature research on the model test stand

Krakowski R.

Journal of KONES

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2013

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Vol. 20, No. 4

177--183

EN

In the paper a model test stand designed and built using original components of diesel engine 4CT90 is presented. The stand provides working conditions as close as possible to the exploitation conditions of the engine cooling system. This applies both to the intensity of heat inside the cylinders of the engine, the temperature uniformity along the cylinder axis, as well as variable-speed water pump. Research carried out on the model stand were aimed at checking the operation of the cooling intensity control with varying levels of filling of the cooling system and develop a control method of the cooling system before testing on the dynamometer stand. In addition, system operation at elevated cooling liquid pressure for the possibility of obtaining the elevated coolant temperature were checked. The influence of working conditions on the level of the temperature was also analysed. In this paper, the characteristics selected for two values of pressure, for 0.15 MPa and 0.2 MPa, and for two different values of the degree of filling of the cooling liquid were presented. During the warming-up and continuous heating of the cylinder and the cylinder head by electrical heaters, temperature and overpressure courses before and after the liquid radiator, temperature before the inlet and outlet of the liquid from the engine and the temperature at selected points inside the engine water jacket are designated. The results of measurements of the coolant pump flow at different speed water pump were also presented in this paper.

4

Influence of speed and load on the engine temperature at an elevated temperature cooling fluid

Krakowski R.

Journal of KONES

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2013

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Vol. 20, No. 4

185--192

EN

In this article has been found that the most popular and widely used method of cooling is liquid cooling, which ensures uniformity of temperature around the combustion chamber and easy acquisition and transfer of heat, although the properties of water are limited by maximum temperature of the coolant. Preliminary scientific research of such a system indicates the possibility of increasing overall efficiency and reducing toxic components in exhaust gases at low engine loads when the engine exhaust temperature of the classic system is too low for efficient catalytic action. This paper presents the dynamometer test stand designed and built using original components of diesel engine 4CT90 production of WSW "ANDORIA" SA. Presented system was designed for the four cylinder with indirect fuel injection system. Research was made on the engine dynamometer stand, which was equipped with standard measure devices (measures: speed, torque, temperatures, flows) and exhaust gas analysers. The temperature of this liquid was increased to the higher level than temperature of boiling water in normal conditions. Overpressure inside the cooling system was limited to 0.3 MPa, the temperature inside the cooling system was increased to 115–120°C. During the test, the cooling system was filled with coolant at 90%. The selected results of investigations of the cooling system for the combustion engine working with higher temperature of the cooling liquid, where the influence of speed and load on the engine temperature were presented.

5

Wpływ uszkodzenia czujnika temperatury cieczy chłodzącej na pracę elektronicznego układu sterowania silnikiem

Sroka R.

Zeszyty Naukowe. Transport / Politechnika Śląska

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2006

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z. 63

215-223

PL

W artykule przedstawiono wyniki badań wpływu temperatury cieczy chłodzącej na wybrane parametry regulacyjne pracy silnika. Badania zostały przeprowadzone na pojeździe marki Opel Zafira B napędzanym silnikiem Zł o pojemności skokowej 2200 [cm3] z systemem bezpośredniego wtrysku benzyny do komory spalania.

EN

The results of investigations of coolant temperature influence on selected regulation parameters are presented in this paper. The research was conducted on Opel Zafira B with 2200 [ccm] direct gasoline injection engine.