Automated manual transmissions embrace the gearbox, the clutch, and the actuators operating gearbox and clutch. Clutch position control is a crucial task, especially for starting off the vehicle. Here, a electro-hydraulic clutch position control system was considered. The model of the hydraulic clutch positioning system consists of three sets of differential equations. The first set describes the motion of the valve piston, the second set the pressure inside the hydraulic cylinder that actuates the clutch, and the third set the motion of the cylinder piston.Based on the flatness approach, a nonlinear feed-forward control was derived. This nonlinear feed-forward control, combined with a linear feedback control, was implemented on a standard transmission control unit, and experiments with a Mercedes-Benz Sprinter and a Mercedes-Benz CLK were conducted. The system performance using the flatness-based control was significantly improved compared to a conventional control approach, and provides an accurate trajectory tracking of the clutch position. This result is even more impressive considering the limited computing resources of the standard transmission control unit, especially the low sampling rate and the integer arithmetic.
Flatnes-based clutch control for automated manual transmissions
Kupplungsregelung anhand der Flachheitstheorie für automatisierte, manuelle Kupplungen
2002
6 Seiten, 5 Bilder, 6 Quellen
Conference paper
Storage medium
English
Flatness-based clutch control for automated manual transmissions
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