Mecelec Design has designed and built a test rig which flushes and tests the actuators in a gas/diesel bi-fuel truck injector. The UUT is the top half of the injector. It is tested and flushed prior to the expensive nozzle being fitted.
The test rig has two heads, each performing an identical test. Initially the injector is flushed, then the cleanliness is checked with inline particle counters.
The injector is then supplied with 300 bar of diesel calibration fluid and fired. The injection pulses are measured with very high accuracy pressure transducers which provide a pressure vs time trace.
The injector leakage is measured by a Coriolis mass flow meter.
The injectors are loaded and unloaded manually but all the clamping and hydraulic connections are automated.