NOP and Atomisation
Description
Designed for measuring the pressure at which a diesel injector
nozzle opens (NOP) and analysing the pattern and makeup of the injection
plumes, The system is capable of testing numerous types of nozzles.
The system counts the number of plumes present, the angle from one
plume to the next and the angle each plume makes with the injection
hole. A PC based vision system acquires an image of the injection pattern
at the moment of injection while an ICS3000 unit is used to measure
the injection pressure. The system uses a two position dial
plate to enable the loading and unloading of components while another is
under test. Upon analysis of the atomisation image and evaluation of
the NOP result the tested component is returned to the operator and a
clear pass/fail indication provided.
All the system parameters, limits pass/fail criteria and diagnostics
functions are accessed via the touch screen HMI interface. All
important features of the system are password protected to prevent
unauthorised access. Full diagnostics functions are provided as are
batch counters and calibration routines for all the system
transducers. A database is used to store test parameters and
criteria so enabling the test parameters and criteria to be
individually defined for each nozzle type.
NOP and Atomisation Test Machine
Operation
The components are manually loaded into the dial plate where a manual orientation operation is carried out. Once the orientation device has been replaced and the guard closed, the component is indexed into the test fixture. Once under the test head, the component is clamped in place, the required load is applied to the lift pin and the system is purged ready for testing.
Test Sequence
The first test performed is the NOP test. This fires the nozzle a predefined number of times before taking an average for the NOP reading over a specified number of injections. The injection chamber is cleared of mist using an air purge ready for the atomisation test. During the atomisation test the pressure is gradually increased until the nozzle fires at which point an image of the injection is captured. This is then automatically analysed to determine if the atomisation part of the test is a pass or not. Following completion of the atomisation test the component is unclamped and indexed to the load/unload station where the operator is given a clear pass or fail indication.
Specifications
| Pressure Control: | Up to 200 bar |
| Temperature: | Ambient to 50°C |
| Cycle Time: | 20 seconds |
| Filtration: | 3 microns |
| No of Injection Plumes: | Up to 16 |
