Method for managing an alternator combined with at least one power battery and driven by a heat engine

An alternator, heat engine technology, applied in the direction of using engine-driven traction, battery circuit device, auxiliary motor power supply, etc., can solve problems such as excessive fuel consumption, deactivation, and limiting lithium battery performance.

CN103974850AActive Publication Date: 2014-08-06RENAULT SA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-08-06

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Abstract

The invention relates to a method for managing a motor vehicle provided with a first battery connected to an alternator and to an electrical network of the vehicle, the alternator being drivable so as to operate either at a strictly positive low alternator voltage (Valt_basse) or at a high alternator voltage (Valt_haute) strictly higher than the low alternator voltage, wherein the method comprises estimating the strength (I(SOC)) of the potential recharging current that the first battery could absorb if it was, at that moment, powered by the high alternator voltage (Valt_haute). The method further comprises estimating a first alternator yield (Rend1) corresponding to the current speed of rotation (omega) of the alternator, and to the strength of the consumed current (Ires) actually fed into the network, estimating a second alternator yield (Rend2) corresponding to the current speed of rotation of the alternator and to the sum of the strengths (I(SOC)+Ires) of the potential recharging current (I(SOC)) of the battery and of the consumed current (Ires), and imposing a high alternator voltage if the difference between the first yield and the second yield is higher than a first threshold (Delta).
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Description

technical field

[0001] The invention relates to an electric power supply system for a motor vehicle with propulsion generated by a heat engine or thermoelectric hybrid propulsion, and notably to an electric power supply system comprising several different types of batteries. Background technique

[0002] Rather, it may be desirable to use different types of batteries in parallel, for example, from the good ability of a lead battery to power a cold start and from the high specific energy and better charging and discharging cycles of batteries of the lithium-ion type. Benefit from high durability.

[0003] Thus patent application US 2011001352 describes a system in which there are two types of batteries whose no-load voltage and internal resistance are chosen such that, for a constant alternator voltage, it is preferably discharged and The lithium battery is then recharged, so the lead battery goes through a smaller number of charge and discharge cycles.

[0004] The use of ...

Examples

Embodiment Construction

[0033] Such as figure 1 As shown in , an electric power supply system 1 for a vehicle comprises an electric power network 2, an alternator 3, a first battery 7 (such as a lithium-ion type battery), a second battery 4 (such as a lead battery) and An electronic control unit 10 . The first battery 7 is equipped with a switch 11 allowing it to be disconnected from the network 2 . The alternator 3 is capable of converting mechanical energy extracted from a shaft linked to a heat engine (not shown) into electrical energy for transmission on the electrical network 2 . The power supply system also includes an ammeter 12, a meter 13 and a state of charge estimator 14, the ammeter inserted in the network 2 and connected in series with the consumers 6, so as to be able to measure The total current absorbed by the elements, the meter is able to estimate the instantaneous rotational speed ω of the alternator 3 (e.g. by directly measuring the rotational speed of the alternator, or by meas...