On-board Spark Plug Center Electrode Temperature Measurement with Wireless Data Transmission
To increase the reliability and the maintenance interval of an internal combustion engine, while operating it with the lowest possible emissions, spark plug wear must be reduced. In this context, information about the spark plug center and the ground electrode temperature is key. Several measurement devices have been developed that measure the temperature of spark plug electrodes. The great challenge is to measure the temperature of the center electrode; on the one hand, the measurement device must be insulated and capable of withstanding the high voltage of the ignition system and on the other hand, the device should not influence the ignition system. All the devices presented in this paper have in common that major reconstruction of the ignition system and/or spark plugs whose design is very different from the standard engine spark plug were necessary. Other systems were presented in which most parts of the ignition system were completely different from the standard parts.