Abstract
AbstractWhen the starter battery is in operation, the power supply system cycles between energy output (starting the combustion engine, running consumers when the engine is off, compensating for energy shortages) and energy replenishment (charging from the vehicle's generator). This article examines the factors that affect the charging current of a starter battery as part of a vehicle's electrical system. The influence of alternator and battery voltage, the internal resistance of the battery, the ambient air temperature, and the wire resistance between alternator and battery on the charging current was experimentally proven. Changes in the charging current of the battery can occur due to natural causes (changes in ambient temperature, changes in battery charge level) or due to changes in the technical condition of the vehicle electrical system (faulty alternator, electrical wiring, and battery). Consequently, an unnatural decrease or increase in the charging current of the battery is unequivocally indicative of a fault, which can be diagnosed quickly on board the vehicle.KeywordsAutomobile power supply systemCharging currentStarter batteryAutomotive generatorDiagnostics
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