Development of Look-Ahead Controller Concepts for a Wheel Loader Application
| Autor: | Nilsson Tomas, Fröberg Anders, Åslund Jan |
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| Jazyk: | English<br />French |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Oil & Gas Science and Technology, Vol 70, Iss 1, Pp 159-178 (2015) |
| Druh dokumentu: | article |
| ISSN: | 1294-4475 1953-8189 63380234 |
| DOI: | 10.2516/ogst/2014022 |
| Popis: | This paper presents two conceptual methods, based on dynamic programming, for one-step look-ahead control of a Continuously Variable Transmission (CVT) in a wheel loader. The first method developed, designated Stochastic Dynamic Programming (SDP), uses a statistical load prediction and stochastic dynamic programming for minimizing fuel use. The second method developed, designated Free-Time Dynamic Programming (FTDP), has vehicle speed as a state and introduces a fixed 0.1 s delay in the bucket controls in a combined minimization of fuel and time. The methods are evaluated using a set of 34 measured loading cycles, used in a ‘leave one out’ manner. The evaluation shows that the SDP method requires about 1/10th of the computational effort of FTDP and has a more transparent impact of differences in the cycle prediction. The FTDP method, on the other hand, shows a 10% lower fuel consumption, which is close to the actual optimum, at the same cycle times, and is able to complete a much larger part of the evaluation cycles. |
| Databáze: | Directory of Open Access Journals |
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