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Uphaus, Frank
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Implementation of an Open-Loop Controller to Design the Longitudinal Vehicle Dynamics in Passenger Cars

Daimler AG-Christoph Andre Malonga Makosi, Ralf Binz, Frank Uphaus, Frank Kirschbaum
Technical University of Darmstadt-Stephan Rinderknecht
Published 2017-03-28 by SAE International in United States
In order to offer a wide range of driving experiences to their customers, original equipment manufacturers implement different driving programs. The driver is capable of manually switching between these programs which alter drivability parameters in the engine control unit. As a result, acceleration forces and gradients are modified, changing the perceived driving experience. Nowadays, drivability is calibrated iteratively through road testing. Hence, the resulting set of parameters incorporated within the engine control unit is strongly dependent on the individual sentiments and decisions of the test engineers.It is shown, that implementing a set of objective criteria offers a way to reduce the influences of personal preferences and sentiments in the drivability calibration process. In combination with the expertise of the test engineers, the desired vehicle behavior can be formalized into a transient set point sequence to give final shape to the acceleration behavior. To control the longitudinal dynamic of the vehicle in order to meet the customer expectations regarding to this set point sequence an open-loop controller is used.To alleviate comfort reducing drive train oscillations (non-linearities…
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