Sensor-controlled hydraulic system with electroviscous fluids

Details Sensor-controlled hydraulic system with electroviscous fluids Sensor-controlled hydraulic system with electroviscous fluids

G - Physics

01

D

73/69

G01D 5/24 (2006.01)

Patent

CA 1292130

A sensor-controlled hydraulic system with electroviscous fluids Abstract of the Disclosure A system-integrated motion sensor is provided fur moni- toring and adjusting the EVF system. The motion sensor is based on the concept that, with the aid of the elec- trodes (4,5) already present, which are used fur the vis- cosity control of the EVF in the hydraulic system, an electric current signal is simultaneously produced which is directly related to the rate of flow of the EVF between the electrodes which are either stationary or can be dis- placed with respect to each other. Thus the motion sensor consists of the electrodes (4,5) with the intermediate EVF layer (1) and a circuit (9,10,11) connected to the elec- trodes (4,5) for measuring the electric signal produced by the motion. The measured signal thus obtained can advant- ageously be used for adjusting or controlling the viscosi- ty of the EVF layer. For this purpose the measured signal is compared with a preadjusted value and the difference is used for controlling a high-voltage device which provides an output voltage dependent on the control voltage. This output voltage is fed back to the electrodes (4,5) of the EVF layer (1) and in turn influences the viscosity. Thus the measuring sensor for the motion, i. e. the EVF layer together with the associated electrodes (4,5), simultane- ously forms the regulating unit for controlling the motion.

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