Engine Torque Pulse Simulation
HORIBA has revolutionized the way vehicle manufacturers test their Powertrains and Front End Accessory Devices. The ETPS dynamometer system accurately produces torsional pulse characteristics of an engine. This new technology employs a sophisticated mathematical model to calculate the resulting torque at the output of the engine based on engine and combustion process parameters.
ETPS - Drive Train Development
To help vehicle manufacturers achieve the ultimate goal of customer satisfaction (durability, driving characteristic, and NVH), transmission and component suppliers must continue to improve upon existing transmissions, as well as develop new powertrains without the aid of an existing engine. Testing technology available to OEMs before the ETPS system was hampering this effort. Until now, the prime mover for test stands was either a fueled engine or an AC motor. Fuelled engine prime movers are expensive to maintain considering the costs for fuel, lubrication, heat removal, engine maintenance and repair, as well as maintaining building codes and fire protection. The calculated torsional pulse response is created on the output shaft of the ETPS dynamometer system by the ultra-low inertia dynamometer and an adaptive closed-loop, real time controller the HORIBA SPARC®. The SPARC® controller continually assures that the calculated torque profile is actually achieved as an excitation (dynamic input) to the test specimen. The ETPS dynamometer system predicts the high frequency torsional pulses of a piston powered engine, Files can be created to simulate engines under development even before they are running prototypes.
In order to produce high fidelity torque pulses, physical properties of traditional dynamometers become practical limitations. These include shaft connection stiffness, large attached inertia, and torque measurement techniques. The HORIBA ETPS dynamometer system overcomes all of these restrictions. ETPS allows the testing of driveline components or systems to be accomplished without a fuelled engine in the test cell. This capability offers a tremendous cost and time savings to the vehicle development engineers. Additional advantages of ETPS are the capability to perform driveline tests in parallel with engine design and testing. No delays in testing due to prototype engine build. The need for complex real- time hardware in the loop (HIL) simulators as well as the need for field-recorded data is eliminated. The flexible test environment provided by ETPS ultimately provides shorter vehicle development cycles and more accurate and efficient testing.
Benefits for electric dynamometer as an input
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