Patent ID: 9682629
Date: 2017-06-20
CPC Classifications: B60L,B60Y,H02J,Y02T

Claim:
1. An electric power supply system for a vehicle including a heat engine able to propel the vehicle, comprising: a network of at least one electricity consuming member; a first electric accumulator battery connected to the network; a controllable alternator connected to the network, driven by the engine, and configured to deliver electric power to the network at a setpoint voltage controllable to at least a strictly positive low alternator voltage, and to a high alternator voltage strictly higher than the low alternator voltage; an ammeter configured to measure instantaneous intensity consumed by the network; an estimator of a state of charge of the first battery configured to estimate intensity of a potential recharging current that the first battery would be capable of absorbing if the first battery was at that instant powered at the high alternator voltage; a meter of a speed of rotation of the alternator; an electronic control unit linked to the meter, to the state of charge estimator, and to the ammeter, and linked to a map of the alternator yield as a function of alternator speed and of intensity output by the alternator, the electronic control unit configured to estimate a first alternator yield corresponding to a current speed of rotation of the alternator, and to an intensity of current consumed actually drawn from the network, to estimate a second alternator yield corresponding to the current speed of rotation of the alternator and to the sum of intensities of a potential recharging current of the battery and of the current consumed, and to impose the high alternator voltage if the difference between the second alternator yield and the first alternator yield is higher than a first threshold.