Experimental evaluation of fuel consumption reduction of a new electrified clutch transmission virtually connected to a vehicle

Paper #:
  • 2017-01-1096

Published:
  • 2017-03-28
Abstract:
Automated Manual Transmission (AMT) based on classic electrohydraulic clutch actuation gives high performances and comfort to a recreational vehicle. However, overall power consumption remains high due to the pump efficiency. Besides, the pump is often driven by the vehicle’s engine and the last is continuously working. To address this issue, a new electrified clutch based on electromechanical actuation has been designed and prototyped. In this paper, an original method is used to experimentally evaluate vehicle fuel consumption reduction using the prototyped new electric clutch. The original method consists in connecting the prototyped new electric clutch to a virtual vehicle to test it as it was used in a real vehicle. A dedicated real-time rapid prototyping system (Opal-RT) runs the simplified vehicle’s dynamic and controls clutch algorithm to generate commands for the clutch as function of the measured clutch responses and as function of the simulated vehicle’s dynamic. The method is called Actuator-In-The-Loop (AIL). On the World-wide Motorcycle emissions Test Cycle 3.2 (WMTC 3.2), for each clutch operational cases, the power consumption of the prototyped new electric clutch was measured and associated to the power consumption of the virtual vehicle. According to this evaluation, on the same driving cycle, a fuel consumption comparison is done with an analogous virtual vehicle equipped with a classic electrohydraulic clutch actuator using an experimental map of the hydraulic pump power consumption. Finally, this experimental evaluation/comparison by AIL method leads to a mean vehicle fuel consumption reduction of 2.95% using the prototyped new electric clutch based on electromechanical technology.
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