A control device apparatus for a proportionally adjustable hydraulic pump
of a closed hydraulic circuit, including an axial piston pump adjustable
from a zero position in two pivoting directions, with an electro hydraulic
valve configuration for the activation of a piston of the hydraulic pump
from both sides and with a feedback device, connected to the piston and
whereby the angular pivoting position of the piston can be fed back to the
valve configuration as a control signal, the valve configuration having a
valve for each pivoting direction of the piston, and the feedback device
comprising two mechanical feeler elements, each connected to one of the
valves and in sliding engagement with the piston in such a way that the
feeler elements are actuated when it leaves the zero position.
