Patent ID: 7676334
Filing Date: 2010-03-09
Classification: G01R

Abstract:
1. A battery condition monitor for storing an initial condition defined by a combination of a battery mounted on a vehicle and said vehicle and comparing the initial condition and a condition during use, using a voltage of said battery which is ever changing before startup and an approximate minimum voltage thereof which is ever changing during startup, thereby to monitor the remaining capacity and the state of deterioration of said battery, said battery condition monitor comprising: detection means for detecting an output voltage of said battery; first storage means for storing first information indicating the relationship between change in a no-load voltage value and change in an internal resistance value for said battery being in a nearly brand-new condition; processing means for, based on said first information stored in said first storage means, based on an initial reference no-load voltage value which is a no-load voltage value detected by said detection means for said battery being in a nearly brand-new and nearly fully-charged condition, and based on an initial reference on-load voltage value which is an output voltage value detected by said detection means when said battery being in a nearly brand-new and nearly fully-charged condition is connected to a predetermined load to be discharged, deriving a reference discharge characteristic of said battery that indicates the relationship between change in said no-load voltage value and change in an on-load voltage value which is an output voltage value detected upon discharge of said predetermined load; and second storage means for storing second information including said initial reference no-load voltage value and said initial reference on-load voltage value, wherein the derivation of said reference discharge characteristic becomes possible without setting a unique parameter for said battery and for each vehicle.