A BATTERY CHARGING SYSTEM FOR A HYBRID ELECTRIC VEHICLE

摘要

A battery charging system and a method for a increasing endurance of a high voltage battery in a hybrid electric vehicle comprising: a high voltage battery (103) for vehicle propulsion; a generator (102) for charging said high voltage battery; a DC/DC converter (104) for converting a high voltage to a low voltage; a low voltage battery (106) charged with said low voltage; and an alternator (112), driven by an engine (101), and connected with said low voltage battery in parallel with said voltage converter; and wherein the method is characterized in the steps:°registering a parameter, where said parameter is at least one of a: -state of charge of said high voltage battery, -energy inflow/outflow to/from said high voltage battery to said vehicle drive motor or said generator; °controlling said low voltage in dependence of said registered parameter.