Browse Publications Technical Papers 2019-01-1500

Testing Methods and Signal Processing Strategies for Automatic Transmission Transient Multiplexed Pressure Data 2019-01-1500

This paper covers the development of test cell hardware, testing procedures, and signal processing to capture and transform transient multiplex pressure data from multiple data acquisition for a highly instrumented 6 speed automatic transmission with a torque converter. A total of 37 pressure transducers were installed in the transmission, with 8 being on several clutches, valve bodies, and other various locations. The remaining 29 transducers were instrumented in the torque converter and transmitted signals via three telemetry transmitters. Each transmitter had the capability of handling 7 or 15 channels. The transmitters multiplexed through the channels in intervals of approximately 1 second. Due to the complexity of the instrumentation, a dyno controller, transmission controller, data acquisition system, and three telemetry receivers were used and synchronized. To accommodate for the multiplexed data a varying time trigger and repetitive testing conditions were designed and used to repeat the transient event on each of the channels. After completing the tests, the data is post processed to split the multiplexed data into individual channels, calibrated, stitched back together, and realigned to show the influence of the transient event throughout the system.


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