Browse Publications Technical Papers 2020-01-0962
2020-04-14

Validation of Road-Preview-Based Predictive Gear Selection on Heavy-Duty Vehicle Transmission Control Unit 2020-01-0962

The eHorizon unit enables the possibility, to get information of the road ahead in a defined prediction horizon. This data, like road gradient, curve radius, velocity limitation and road class, can be used by the on-board transmission control unit (TCU) via Controller Area Network (CAN) bus. This obtained predictive road information combined with the actual driving conditions are used to optimize the shifting strategy by a nonlinear model predictive control (NMPC) algorithm which intends to reduce the fuel consumption. The optimization problem in the PGS strategy is solved by a nonlinear optimization based dynamic programming. In this paper, the predictive gear selection (PGS) strategy will be compared to a conventional automatic gear shifting strategy in a simulation environment and validated on road by implementing it a heavy-duty truck with a 16-speed automated manual transmission (AMT). At last, this strategy consumes in total around 20kb RAM which can be handled by modern SOP TCU.

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