A new drive line control concept for a vehicle drive line with electrically controlled engine and a hydrostatic transmission with two variable displacement machines is presented in this paper. The presented drive line control concept allows the reduction of power losses using an on-line optimization procedure. For the control concept two separate closed loop speed controls are used for the speed control of the hydrostatic transmission and the speed control of the engine speed. To solve the given optimization problem a one-dimensional direct optimization strategy is used in combination with a sequential closed loop speed control. This considers the loss characteristics of both displacement machines of the hydrostatic transmission as well as the steady state characteristics of the combustion engine using pure mathematical approximations of measured curves. Comparison between the one-dimensional and a multi-dimensional optimization procedure (Rotating Coordinate Strategy of Rosenbrock) under steady state conditions showed that an application of a multi-dimensional optimization procedure (even as two-dimensional problem) is reasonable under certain circumstances. Due to the higher computational effort of the Rosenbrock Rotating Coordinate Strategy experimental validation were made using the Fibonacci Search. Using a hardware-inthe lop test rig a typical loading manoeuvre with travelling of the machine in a plane has been investigated. The experiments have shown a fuel reduction of 13 % for this manoeuvre.
Application for a direct optimization procedure for drive line control
Anwendung eines direkten Optimierungsverfahrens auf ein hydrostatisches Antriebssystem
2004
17 Seiten, 8 Bilder, 3 Tabellen, 16 Quellen
Aufsatz (Konferenz)
Englisch
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