Community Research and Development Information Service - CORDIS

Engine Level Validation Expertise

To give evidence to the predicted advantages of a consequential lightweight design in an electromagnetic valve train system (EMVT), a demonstration and a standard 4-cylinder inline spark ignition engine has been conducted. The emphasis of the testing was lying on the endurance testing and to a lesser extent on the known advantages of an EMVT system like fuel efficiency or lower pollutant emissions. These points have already been proven in several publications.

The engine was installed on a test bench and was equipped with 16 lightweight valves an 8 double actuators. The 4 actuators on the intake side were of the downsized actuator type. The control and power electronics were a commercially available system for EMVT test benches. Since the initially intended lightweight valves from outside the ELVAS project were not available, a coating for the Titanium-Aluminum (TiAl) alloy valves had to be developed within the ELVAS project.

After a 200-hour endurance test at 2150 rpm and two load points, the guides and valve seats of the cylinder head as well as the valves and armatures themselves were subjected to an investigation concerning the mechanical wear. Except for the tip ends of valves and armatures, wear was almost not detectable. A solution for the tip end problem is under way.
The engine level validation has shown the predicted advantages of a lightweight EMVT design and that a durable implementation of such a system is feasible.

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TRW Automotive GmbH
Hannoversche Strasse 73
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