TESTING The integrated 14 DOF vehicle
model comprises 6 DOF for the vehicle chassis, ie x, y, z movement and yaw, pitch and roll rotation, and 2 DOF for each wheel, ie rotational speed and steering angle. The capability of simulating individual wheel steering angles works well with Rototest’s dynamometer solution that provides a fully floating test environment enabling all wheels to physically provide steering angles, all the way up to full steering (+/- 45 degrees). Modelling and simulation are
increasingly being used within the automotive industry to reduce development time and costs. With models, capabilities of a future vehicle can be simulated before it physically exists. This increases the speed of development and major mistakes can be avoided prior to production. Rototest fully supports this trend
with its dual interface, one with an integrated vehicle model and one open for any external model. All standard communication interfaces
Multiple DOF allows for more accurate test results
are supported such as CAN, Ethernet and EtherCAT. Rototest has together with one of its technology partners, IPG Automotive, added a connection through Rototest’s open interface to
the IPG Xpack4 real-time system to be run in combination with IPG’s simulation software CarMaker. This allows OEMs and Tier 1s that use CarMaker earlier in the development phases to further utilise their resource investment in modelling in the powertrain phase with potential savings. The system only requires a hard
floor to be installed. As there are no horizontal forces acting on the vehicle during testing, full accelerations or emergency braking are of no concern and this ensures a stable testing environment with an unmatched vehicle installation time. The unique capability of
physical steering has proven to be very valuable for certain ADAS functionality as well as in Automated/Autonomous Driving (AD) testing. The steering functionality can be further improved with Rototest’s newly introduced steering force feedback system. The patented system together with the powertrain dynamometers presents a testing environment that gives the driver (or the AD control system) a natural steering feeling while driving, all without modification or connections to the test vehicle. ●
The author is from the Advanced Engineering team at Rototest
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www.engineerlive.com
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