Abstract
Modern drive units designed for driving non-road machines are characterized by liberal regulations regarding the limits of toxic compounds emission in exhaust gases. These regulations contribute to the low level of technical advancement of this type of drive units. Among the new non-road small engines (SI) offered in the sale in 2018 in the European Union, the majority of them are equipped with carburettor systems whose fuel supply characteristics do not allow to achieve modern fuel-air mixture control standards. Therefore, action should be taken to develop these drive units towards electronic control of combustion processes in these engines, which will allow the use of innovative control algorithms. One of the basic signals supporting the selection of the air-fuel mixture is the engine temperature. The paper presents an overview of the methods for measuring the temperature of internal combustion engines and presents the results of research on the process of warming up the engine. The tests were carried out with three methods using an oil temperature sensor, a surface temperature sensor and a thermal imaging camera. An attempt was made to indicate construction guidelines taking into account the place of temperature measurement, correction factors were determined in relation to the oil temperature. The developed coefficients can be used to precisely determine the thermal state of the engine, which is an important aspect in the process of controlling the fuel-air mixture and affects its consumption.
Highlights
Air pollution in recent years has become a serious environmental problem affecting people's health and lives [1,2,3]
The classic air-cooled drive units were not equipped with an injection system, the temperature measurement did not affect the regulation of the composition of the mixture, which was regulated by the carburettor fuel system
The research indicated that the temperature measurement of the engine in the head makes it possible to assess the change of oil temperature using the correction factors discussed in the paper
Summary
Air pollution in recent years has become a serious environmental problem affecting people's health and lives [1,2,3]. The interchange ability of signals and the possibility of their use by various control units used in the vehicle made it possible to develop safety, comfort and vehicle traffic control systems that interact with each other Another group of devices equipped with internal combustion engines are non-road work machines. The oil temperature measurement is usually a control measurement aimed at signalling the exceeding of the acceptable temperature range Another is the sensor for measuring the temperature of the engine components, most often used in air-cooled drive units. The classic air-cooled drive units were not equipped with an injection system, the temperature measurement did not affect the regulation of the composition of the mixture, which was regulated by the carburettor fuel system.
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