Products on Show
DAY 2: On display: The latest highly integrated wheel-force measurement system for motorcycles and passenger cars
AIM Arnold Intelligente Messsysteme
AIM Arnold Intelligente Messsysteme is using Automotive Testing Technology Expo Europe to display its latest developments for wheel-force measurement. These include an updated instrumented wheel for two-wheel vehicles and, new to the market, a unit for passenger car applications.
“It was a design criterion to have everything you need inside the vehicle, nothing outside,” said company founder Hans Arnold. “When we made our first [motorcycle] system for a company in Japan that already had wheel-force measurement capabilities, we saw why they wanted a new system. The existing system they had used batteries and outside telemetry, which was complicated to install. Our wheels are just mounted like a standard wheel; you plug in the power supply and a CAN logger and you can start testing.”
The setup and calibration of the wheel are also very straightforward. “There is stored calibration in the wheel and all you have to do is the zero offset for the signal via the CAN bus, and after installation, the angular offset, simply by turning the wheel to a vertical position, checking it with a spirit level and pressing a button,” explained Arnold.
A notable feature of the updated ROLSmc-HD for two-wheelers is the use of a wheel assembly made entirely from carbon fiber, used to keep the overall wheel mass the same as a standard unit despite the addition of the instrumentation in the center. Arnold noted that this is very important to ensure representative behavior from the wheel, particularly in terms of its response to high-frequency movement.
The motorcycle and passenger car (ROLS4w) units use a similar circular measuring element, consisting of five strain-gauge-based, three-component measuring elements. The 15 signals from the full-bridge strain gauges (built to the company’s specific design) are amplified and processed using a DSP integrated into the wheel center.
The ROLSmc-HD and the ROLS4w are on display at the expo, with the latter now TÜV approved and available for use in on-road vehicle tests.