Updated vibration sensor enhances engine analysis tool

The existing EPM-XP^plus tool allows engineers to detect potential problems by taking regular measurements during engine operations. The company noted that, without using the vibration sensor, the engineer can readily identify deviations by comparing results with indicator diagrams for the mean indicated pressure (MIP), the peak pressure (Pmax) or compression pressure (Pcomp). 

However, other potential issues are harder to identify simply by comparison with indicator diagrams. IMES gives the examples of high-pressure fuel system failures where existing cylinder pressure indicator systems do not help to analyse the exact point of fuel injection. Similarly, it is challenging to precisely determine valve movements when faults with the inlet valve or exhaust valve controls occur. 

By attaching the vibration sensor to the injector magnetically, the sensor records the point of lifting and landing of the injector needle as well as the beginning and ending of the fuel supply by the injection pump. The vibration sensor can be attached via a magnetic holder to the injector or pump, while the device’s measurement data will be processed by the EPM-XP^plus visualisation software. IMES notes that customers have achieved very good results by analysing the vibration diagrams in parallel with the indicator diagrams. 

The vibration sensor as part of the engine analyser EPM-XP^plus extends the range of advanced diagnostic options available to engineers: 

– Phases of lifting and landing of the injector needle

– Beginning and ending of the circulation of the heated heavy fuel in the fuel system

– Phases of beginning of fuel supply and of shutdown of the high-pressure pump

– Phases of closing and (in some cases) of opening of the gas distribution valves

The vibration monitoring approach also fulfils the requirements of the marine classification societies regarding non-destructive testing as there is no need for mechanical intervention on the engine during the installation of the vibration sensor.