A Comparative Study of Evaluation Indicators of Spark Plug Electrode Erosion Resistance Using High Energy Ignition

Lean combustion is one of the effective methods to improve the efficiency of engine. High energy ignition can significantly enhance the stability of lean combustion, attracting widespread attention in engine applications, particularly in GDI engines. However, higher ignition energy accelerates the erosion rate of spark plug electrodes, thereby shortening their lifespan. This study used an erosion testing system for spark plug center electrode materials based on a self-made high energy ignition device and proposed corresponding evaluation indicators. Using this system, the erosion resistance of eight different electrode materials was assessed through three indicators. The results indicate that the testing system enables rapid detection on the erosion resistance of spark plug electrode materials. Connecting the center electrode to the cathode can accelerate electrode material erosion and shorten the testing cycle. Compared to the other two indicators, the electrode volume presented more stable measurement accuracy, making it a more reliable approach for evaluating the erosion resistance of spark plug electrodes. Under the test conditions, iridium-based alloys possess superior erosion resistance with lower erosion than platinum-based alloy.