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1. (WO2018033302) METHOD FOR ACTUATING A VALVE DEVICE ON THE BASIS OF A CHARACTERISTIC CURVE

Pub. No.:    WO/2018/033302    International Application No.:    PCT/EP2017/067221
Publication Date: Fri Feb 23 00:59:59 CET 2018 International Filing Date: Tue Jul 11 01:59:59 CEST 2017
IPC: F16K 37/00
F16H 61/00
F16H 57/04
Applicants: ZF FRIEDRICHSHAFEN AG
Inventors: TERWART, Markus
NOVAK, Rainer
FRIEDERICH, Dirk
Title: METHOD FOR ACTUATING A VALVE DEVICE ON THE BASIS OF A CHARACTERISTIC CURVE
Abstract:
The invention relates to a method for actuating a valve device on the basis of a characteristic curve (v_kk, v_kkD) via which a respective target value (i_EDS) that corresponds to an actuation variable of the valve device can be determined, said target value correlating to a characteristic curve (v_kk, v_kkD) starting value corresponding to a requested operating state of the valve device. The valve device is actuated using a dither which is superimposed with the target value (i_EDS) and which has such a frequency that the operating state of the valve device follows the actuation in a defined manner according to the characteristic curve (v_kk, v_kkD) and the characteristic curve (v_kk, v_kkD) is used to determine the respective starting values ("1", x) which correlate to the target values (i_EDS) present at the reversal points of the harmonic vibration imprinted onto the valve device by means of the dither and on the basis of which additional respective starting values are ascertained, wherein the actuation of the valve device is carried out on the basis of said additional starting values. The amplitude of the dither a specified such that during an actuation of the valve device, one of the reversal points lies in the vicinity of the transition region (i_EDS1, i_EDS2, i_EDS3, or i_EDS4) between a first characteristic curve region (v_kk1 or v_kk3) and a third characteristic curve region (v_kk2) or between a second characteristic curve region (v_kk3 or v_kk5) and a third characteristic curve region (v_kk4) in the first characteristic curve region (v_kk1 or v_kk3) or in the second characteristic curve region (v_kk3 or v_kk5) and the respective other reversal point lies in the third characteristic curve region (v_kk4).