Loading patent…
AssigneeValeo Equipements Electriques Moteur
InventorsPierre Chassard, Pierre Tisserand, Laurent Labiste
Estimating the term…
A method is disclosed to produce a supply voltage (B+) in an on-board system of a vehicle in response to an excitation current (I_ROTOR) applied to a rotor of the alternator. The method is of the type that consists in: limiting the resisting torque by determining a maximum cyclic ratio (DC_C_LIMIT) of the excitation current as a function of variables taken from a group containing a rotational speed (V_ROTOR) of the rotor, a temperature of the rotor, the excitation current and the supply voltage (B+). The maximum cyclic ratio is determined as a function of at least two of the variables in the group. According to one specific embodiment, the variables are rotational speed and temperature. According to another embodiment, the variables are rotational speed and excitation current.
Process for controlling a resistant torque (C) of a motor vehicle alternator intended to be coupled to an internal combustion engine of a vehicle and capable of producing a feed voltage (B+) for a system on board the said vehicle in response to an excitation current (I_ROTOR) applied to a rotor of said alternator, the said process comprising limiting said resistant torque (C) by determining a maximum duty cycle (DC_LIMIT) for the excitation current (I_ROTOR) in relation to variables taken from a group comprising a rotation speed (V_ROTOR) of said rotor, a temperature (T_ROTOR) of said rotor, said excitation current (I_ROTOR) and said feed voltage (B+) being characterised in that the wherein said maximum duty cycle (DC_LIMIT) is determined as a function of at least said rotation speed (V_ROTOR) and said temperature (T_ROTOR), said maximum duty cycle (DC_LIMIT) being equal to a linear function of said temperature (T_ROTOR) having a gradient which is inversely proportional to said rotation speed (V_ROTOR).
Dependencies are inferred from the claim text.