Battery's e.g. lead-acid battery, maximum capacity determining method for motor vehicle, involves estimating value of maximum charge capacity of battery, where curve illustrating charge of battery based on charge state is straight line

摘要

The method involves determining a charge state (SOC) of a battery or measuring significant physical quantity of the charge state. Current circulating in the battery is measured to determine charge variation (DELTA-Q) of the battery by integration. A ratio between the charge variation of the battery and the corresponding charge state variation (DELTA-SOC) is determined from the measured current. A value of maximum charge capacity (Qmax) of the battery is estimated from the determined ratio, where a curve illustrating the charge of the battery based on the charge state is a straight line. Independent claims are also included for the following: (1) a computer program comprising instructions for implementing a battery's maximum capacity determining method (2) a computing system such as computer module to be embarked on a motor vehicle, comprising units for implementing the battery's maximum capacity determining method.