Liebherr uses an up-to-date computer-assisted quality management system that is implemented as early as the production process and covers the entire product life cycle. Efficient test benches, often specially developed for Liebherr, are used in testing the high precision components.
Extensive entry inspections
All purchased parts of the Common Rail fuel injection system are checked for their highest quality with the aid of highly modern measurement instruments.
These include for example, 3D coordinate measuring devices roughness and contour measuring systems as well as an optical surface scanner.
Before delivering the fuel injection systems, the high-pressure pumps, injectors and high pressure connectors are tested 100% for functional and service life-relevant quality features such as flow, torque or leakage. The Data Matrix Code (DMC) is used to track the assembled parts and assign them to the corresponding system components.
Measurements and testing for injection systems
Leakage test of the injector
A camera system is used to test the nozzle or nozzle needle to ensure that there is no leakage. In the process, the camera records any drop formation on the nozzle which is subjected to high pressure.
Spray pattern test bench
With the aid of a camera, the test bench measures the geometry of the spray pattern of the injector. Due to the very high speed of the injection process this places high demands on the measurement system as well as on the synchronization of the measurement and control loop.
Modern measurement instruments are used to measure the geometry of the Liebherr Common Rail system parts. The photo shows the evaluation of the round surface of the control valve.
Highest quality standards
Quality assurance is certified according to DIN EN ISO 9001:2015 and complies with VDA standards (reliability control circuit). Statistical evaluations and FMEA (Failure Mode and Effects Analyses) are an integral part of the process, as well as the effectiveness testing of changes. In all our processes and operations, we follow the principle of PDCA and integrate Continuous Improvement (CI) in our daily work.