Dynamometer supplier Sakor Technologies has recently provided a performance test stand for validating designs for new hydraulic variable timing cam phaser systems for a major international provider of powertrain components. The cam phaser test stand will be used for research and development on engine timing designs in order improve engine fuel efficiency.
Sakor says that the custom-built system is designed for use with cam phasers driven by oil pressure. The test system simulates different engine designs, simulating cam torque pulses using two high-speed, low-inertia AccuDyne AC Dynamometers coupled with a DynoLAB data acquisition and control system. One dynamometer drives the timing chain as if it were the engine, while the other simulates cam shaft torque pulses. Parts for testing are mounted in a thermal chamber that can be run at temperatures ranging from -40 to 150°C. This enables engineers to simulate temperatures encountered by those starting engines in all climates. The system controls oil pressure to advance or retard timing of the cam shaft relative to the engine.
The system features a 60kWdynamometers that can operate at up to ,8500 revolutions per minute (rpm) to simulate the engine. A 235kW ultra-low inertia dynamometer is used to simulate the high-frequency torque pulses found on a cam shaft. The test stand can be easily adjusted, so it can accommodate a wide range of cam phaser designs. The DynoLAB data acquisition and control system provides fully automated test procedures for all customer testing protocols.
“Sakor is dedicated to helping customers design the next generation of fuel-efficient engines in ways that do not require huge expensive facilities to conduct testing of components,” said Randal Beattie, president of Sakor. “To the best of our knowledge, ours is the first system capable of simulating dynamic cam shaft torque pulsing in real time and in a clean lab environment.”