Acta Univ. Agric. Silvic. Mendelianae Brun. 2014, 62, 961-969
Published online 2014-12-02

Possibilities of Monitoring the Technical Condition of the Combustion Engine with Starter Load Current

Michal Jukl, Adam Polcar, Jiří Čupera

Department of Technology and Automobile Transport, Faculty of Agronomy, Mendel University in Brno, 613 00 Brno, Czech Republic

This article deals with the verification of relations between the electric current of engine starter and tightness of the combustion chamber and the possibility of its use for the evaluation of the state in terms of engine wear. Engine wear is closely related to the quality of fuel combustion and also with the amount of produced harmful emissions. On this basis, it would be possible to extend the technical requirements of the protocol OBD to include the indirect control of engine wear. To meet the objectives set out above measurement was carried out by a petrol engine, which was located in the vehicle Škoda Felicia Combi GLX 1.3 The whole measurement was divided into several parts. The first measurement was carried out on the abovementioned motor without simulating leakage. The second measurement was performed when the leakage of one cylinder was simulated. Simulated leakage was conducted at removing the spark plugs. Other measurements simulated “mild” leak of the whole engine – all cylinders. Leakage was implemented by loosing all the spark plugs about 8 turns against full tightening with the appropriate torque. The last, fourth measurement simulates a “large” leaks of engine cylinders. This leakage was induced by removing all the spark plugs from all cylinders. As the measurement results showed leakage of one cylinder, and also the whole engine is reflected not only in the individual amplitude of the starter current, but also the shape of the entire curve.


This study was supported by the project No. IP 14/2014 “Diagnostic protocol OBD-2 based on SAE J1939” and financed by Internal Grant Agency Mendel University in Brno, Faculty of Agronomy. The research has been supported by the project TP 4/2014 „Analysis of degradation processes of modern materials used in agricultural technology“ and financed by IGA AF MENDELU.


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