Rexroth-Sigma

J Pierre Rigat-Esselin

Marc Menvielle

Gerard Laroze

Patrick Gerbier

An electric remote control device (20) includes sliding pushers (27) associated two by two and actuated from an actuating member. Each pusher is associated with a converter for generating an electric signal, a parameter of which is representative of the movement and/or position of the pusher and a signal processor (33) processes the signal produced at the output of the converter. The device provides for storing a defining equation between the position of the actuating member and the parameter of the output signal and the device includes a first storage unit (35) for storing the value of the parameter of the output signal of the converter when the actuating member is in a neutral position, corresponding to zero movement of the pusher, and a second storage (36) unit for storing the value of the parameter of the output signal of the converter when the actuating member is in an endmost position corresponding to maximum movement of the pusher.

Method of calibrating an electric remote control device of the

System for regulating the mean current flowing through a load (1), particularly an electric device controlling the phenomenon to be regulated, from initial variable control information (.alpha.), a DC voltage source (V.sub.alim) being provided for supplying this load, comprising: a measuring device (4) for permanently measuring the value of the variable information (.alpha.); a determination device (5, 6) for causing a mean theoretical current value to be applied to the load (1) to correspond to each value of the information (.alpha.); a further measuring device (7) for measuring the real DC voltage supplied by the supply voltage source; a computing device (8) for computing, from the determined value of the mean theoretical current and the measured value of the DC supply voltage, a theoretical value of the cyclic ratio (pwm) of a pre-determined fixed frequency square wave voltage signal; a generator (2) for generating a fixed frequency square wave voltage signal having the computed cyclic ratio, this signal being applied to the load; another measuring device (10) for measuring the real mean current flowing through the load; a comparator (11) for comparing the values of the real and theoretical mean currents and generating an error signal (.epsilon.); and a correcting device (9) for correcting the theoretical value of the cyclic ratio as a function of the error signal.

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Tassin la Demi Lune, France

J Pierre Rigat-Esselin