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Historically, driveshaft torque data has been obtained using slip rings. Slip rings, however, are expensive, and require time-intensive driveshaft modifications for proper installation. In addition, the time and expense involved in field servicing units is prohibitive. For these reasons, AISIN Technical Center of America (ATCA) investigated a viable telemetry solution. At the onset of this development activity, existing torque telemetry solutions had their own issues. In particular, they did not offer the same data resolution as slip rings, they lacked sufficient battery life for long-term, real-world testing applications, and they suffered from data drop-outs. ATCA worked with TECAT Performance Systems to develop a torque telemetry solution that addressed all of these issues. This paper presents the development activity involved, alongside real-world measurement data showing the results of both the slip ring and telemetry solutions.

In the world of BSR (Buzz, Squeak and Rattle) testing, there is a high level of sophistication regarding the test machines employed to excite the items under test as well as the techniques used to ensure that the test is representative of real-life operating conditions. However, the object of the measurements, i.e., the identification of transient acoustic events classified as Buzz, Squeak or Rattle, is mostly a subjective procedure with classification in terms of Sound Pressure Level in dB(A) or Stationary Loudness. These “standard” metrics have proven, in general, unreliable in assessing the importance of individual transient events, and inappropriate to describe the vehicle signature from a BSR standpoint.