Krzysztof Szczurowski

ENERGY SCAVENGING IN A VEHICLE'S EXHAUST SYSTEM

Present- day development of power transmission systems, especially the ones based on combustion engines, is trying to cope with the issue of improving the energy efficiency of energy processing systems. One of the directions is to use the techniques of thermal energy recovery from an engine’s exhaust system. Vast part of the energy produced while burning the air- fuel mixture is lost in the cooling and exhaust systems. Research in this area was conducted by numerous teams, both abroad and in Poland, while focusing on use of Peltirea cells. The results of their research demonstrated small efficiency of these cells. In this paper, the authors have focused on modifications of the exhaust system in order to improve heat exchange between the exhaust system’s elements and TEG. The research was conducted while using the ECOTEC 1.8 litre engine from Opel, the X18XE model. The engine was installed in a testbed, in the mechatronic lab at the Faculty of Automotive and Construction Machinery Engineering (SIMR) of Warsaw University of Technology. Spartan HE923 radiators were installed on the cold end of the module. The paper presents the results of the research related to interworking of TEG’s with the exhaust system’s heat-generating elements of various shapes. The paper reviews the energy efficiency of TEG depending on diverse parameters of gas flow. A parallel system has been assumed (controlled stream and pressure of the flowing exhaust gases without any interference as regards the speed of the of combustion engine). The factor-related experiment accounts for the influence that the pressure and temperature difference, depending on the volume and discharge of exhaust fumes, have on the efficiency of TEG for the same temperature. The results of the experiment are presented in the last section of the article.

Analysis of Possibility of Use Peltier Modules in Task of Energy Scavenging

Actually in motor industry, specialty in car market is tender to maximum utilization of energy included in fuel air mixture, which most of part of burning process is lost. In todays times Peltier module are generally available, which is mainly used in coolers for keeping of low temperature. They make use of Peltier phenomenon, relying on power module from electric net for manufactured low temperature on cold side that module. Module producers usually available voltages characteristics thats working modules.In realize research use that same modules but for recuperate electrical energy from temperature. Research target was in temperature equivalent on cold side and warm side check value of manufactured voltage from these modules. Utilized of Seebeck phenomenon depends on heat of warm side with simultaneously cool module cold side which manufacture electricity.In effect realize research findings series of results for which equivalent characteristics describing those module capacities. The first influence from realize research is fact that characteristics isnt identical with characteristics for that same modules manufactured low temperature.

Methods of identification of data transmitted in the in-vehicle CAN-BUS networks

In the first part of this paper the operation mechanism of exchanging the data used in vehicles and equipment as well as the applied security measures have been presented. In the further part of the work, the identification method for the data in the network, for which the encoding system is not known, has been discussed. Subsequently, a suggestion of the decoding method for the network-derived data has been presented.

Using Vibroacoustic Signals in Evaluation of Knocking Combustion in a Dual Fuel Engine

Current development of automotive domain heading towards the ever decreasing pollution emission as well as using the alternative fuels resulted in analysis of the possibilities to power the combustion engines with combinations of several fuels. The multi-fuel engines designed in such a way can use the advantages of specific fuel. The most popular trend uses self-ignition engines to operate on the fluid fuels such as the diesel oil or its mixtures, and on the gaseous fuel such as CNG or LPG. In Poland, because of the extensive network of LPG stations, the interest in adapting vehicles to this type of fuelling increases. This is particularly vital for heavy and large goods vehicles, in the case of which the fuel saving possibility of a few to a dozen or so percent is very interesting. Using gaseous fuels in engines with the self-ignition results in the occurrence of the previously unknown phenomena. Such a phenomenon is, among others, the knocking combustion, the cause for which is the premature ignition of the air-fuel mixture most frequently occurring in the area of the top dead centre. The knocking combustion is characterized by a faster increase in pressure as compared to normal combustion, and it is a detrimental phenomenon to the engine operation, especially before the top dead centre. The growth speed of the combustion pressure can be correlated with the manner of combustion, which is also evident in the vibroacoustic signal, whose characteristics will undergo changes alongside the combustion speed. The analysis of the remaining work parameters influencing the vibroacoustic signal will enable determining the moments of the knocking combustion occurrence and will thus allow for optimization of the gaseous fuel dose, which directly influences the pollution emission as well as the economical aspect.

Proposal of Reconfigurable Drive System with CVT

This paper presents an analysis of the feasibility of their control system reconfigurable powertrain vehicle using an internal combustion engine and CVT transmission (CVT––Continuously Variable Transmission).

Comparison of spectral analysis of vibration using commercial knock sensor and 3-axis acceleration sensor

With the development of internal combustion engines, engineers attempt to reduce the noise and vibration generated. Due to the high cost of fuel, are increasingly looking for new sources of power in order to reduce costs. In diesel engines, an increasingly popular method is the admixture of propane-butane. This follows because of the price of the fuel as well as to improve the efficiency of combustion. With the development of this type of dual fuel power seems to be a reasonable study of the effects of LPG to generate noise and vibration, as well as an attempt to evaluate the combustion process. Unfortunately, too much addition of LPG causes a phenomenon called knock consisting in abnormal, uneven, explosive combustion of fuels in reciprocating engines. This phenomenon may lead to a reduction in engine performance and permanent damage. Control of the knock detection uses vibration acceleration sensors recording the high frequency ranges. Within the framework of the research conducted by the team of authors, an attempt was made to compare the vibroacoustic signals originating from the commercial knocking sensor with a three-axis acceleration sensor. These signals were subject to a quick Fourier transform in the purpose of analysing the amplitude spectra.