Abstract: A system for plotting a mark drawn on a writing medium, comprising a tool including a first and a second permanent magnet. The first permanent magnet is mechanically linked to a tip. There is a network of magnetometers having N triaxial magnetometers and an electronic computer programmed in order to: a) determine, from the measurements from the triaxial magnetometers, the positions of the two permanent magnets and the orientations of the magnetic moments of said two permanent magnets and b) calculate the relative position and/or relative orientation of the magnetic moment of the first permanent magnet in relation to the orientation of the magnetic moment of the second permanent magnet from the results of step a). The calculated relative position and/or orientation is then used by a device as a value of a physical quantity that is representative of the pressure exerted on the tip.

Abstract: The invention relates to a method for energy management in an electrically assisted vehicle, comprising the following steps: a) determining the quantity of total energy required for a journey; and b) allocating a quantity of electrical energy to the journey and deducing the quantity of human energy required for the journey on the basis thereof, or allocating a quantity of human energy to the journey and deducing the quantity of electrical energy required for the journey on the basis thereof.

Abstract: The invention relates to a power management method for an electrically assisted vehicle, comprising the following steps: a) determining the total amount of power required for a journey; and b) assigning an amount of electric power to the journey and deducing therefrom the amount of human power required for the journey, or assigning an amount of human power to the journey and deducing therefrom the amount of electric power required for the journey.