The Use of Measurement on the Spark Plugs for the Analysis of the Ignition and Injection System

The article deals with the use of high-voltage measurement on the spark plug for the analysis and detection of faults in the ignition and injection system in the car. It is proposed to use the spark plug as an off-line sensor, on which it is possible to compare real high-voltage waveforms in time during operation with reference waveforms for individual cylinders. In the article, high-voltage waveforms are measured under two extreme conditions, i.e. with on and off injection. Measurements were made using high-voltage probes and a datalogger modified in the LabVIEW program. At the end of the article, these curves are compared, and an error graph is determined for an extreme failure of the injection system for a given cylinder. Within this graph, it is also possible to determine a partial error or failure in the injection system.