Thermal and electrical analysis of automotive ignition system

This article describes evaluation principles of individual parts of the ignition system, using conventional diagnostic systems, based on evaluation of current and voltage waveforms. By means of the practical test, diagnostics, measurements and subsequent analysis it was proved that thermovision plays an important role in diagnostics in on-line check automotive equipment. By comparing the non-standard warming behaviour of a part of the electrical system with combination with time highvoltage method, it is possible to diagnose a fault and also check the operating mode of the system. Sample thermogram of the temperature distribution of the ignition coils and analysis of high-voltage ignition curves with faulty spark plugs is given in the part of the paper of nondestructive diagnostics with a difference in temperature. Analysing the fault condition of ignition systems, using the method conventional diagnosis of high-voltage pulse waveforms and also the method of thermovision diagnostics, we can adequately evaluate the functionality of the electronic system and its individual components. In some cases, with one coil ignition systems, we cannot use the conventional method and therefore it is preferable to proceed to the analysis of temperature fields.