Detection of Changes in the Opening Pressure of Marine Engine Injectors Using Vibration Methods

Sa？etak Injectors of marine engines are, apart from injection pumps, a key element of the fuel injection system. Their proper operation affects the quality and time of producing the fuel-air mixture in engine cylinders. The technical condition of the injectors also has an impact on engine performance and the emission of harmful compounds into the atmosphere. One of the basic injector damages occurring during their normal operation is the change of the injector opening pressure. The article presents mathematical relations indicating the occurrence of vibration diagnostic parameters that could potentially determine changes in the opening pressure of individual injectors. A two-stage passive-active experiment was carried out during which an injector working with different spring preload force was tested. The presented results of experimental tests confirm the possibility of determining whether the injector opening pressure is within the permissible range. The presented method does not require interference in the engine operation. measurements can be made during regular operation