Electric power system

Abstract

The disclosure provides an electric power system capable of determining whether malfunction occurs in a module to estimate the SOC of the battery. Provided is an electric power system mounted on a vehicle having an engine (1), a battery, and a starter (4) that starts the engine (1). The electric power system includes an SOC estimation part (71), estimating the SOC of the battery based on a first algorithm; an idling stop control part (73), permitting implementation of an idling stop control when an estimation result of the SOC estimation part (71) satisfies a predetermined automatic stop condition; a full charge determination part (72), determining whether the battery is in a full charge state based on a second algorithm different from the first algorithm; and a malfunction determination part (74), determining that malfunction occurs in the SOC estimation part (71) when the battery (3) is estimated in the full charge state by the full charge determination part (72) and the estimation result of the SOC estimation part (71) does not satisfy the automatic stop condition.

Description

technical field [0001] The invention relates to a power supply system. More specifically, it relates to a power supply system mounted on a vehicle including an internal combustion engine, a battery, and a starter. Background technique [0002] Most vehicles that run using an internal combustion engine as a power generation source are equipped with a so-called idling stop function to suppress fuel consumption in the internal combustion engine. The idling stop function refers to a function of temporarily stopping the internal combustion engine when predetermined automatic stop conditions are met, and then restarting the internal combustion engine when predetermined automatic return conditions are met. [0003] However, when the internal combustion engine is restarted, the crankshaft of the internal combustion engine is driven by the starter, and the power consumed by the starter is sometimes provided by a battery that supplies electric power to vehicle auxiliary equipment (li...

AI Technical Summary

Problems solved by technology

Therefore, if the charging rate of the battery (a parameter representing the ratio of the remaining capacity of the battery to the full charging capacity in percentage, hereinafter also referred to as "SOC (State Of Charge)") is insufficient when restarting, then It is possible that other vehicle auxiliary equipment may not work properly due to the voltage drop when restarting

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