MAINTAINING A VEHICLE BATTERY

摘要

A method is provided for determining a lower voltage set-point, an upper voltage set-point, a temperature-dependent upper current set-point, a time limit value, and a lower current hysteresis threshold set-point based on a measured temperature of a battery. A charge current from a battery charging circuit is provided. If a charge voltage is above the lower voltage set-point and below the upper voltage set-point and the charge current exceeds the temperature-dependent upper current set-point, timer is started. If the timer reaches a time limit value while the charge current exceeds the temperature-dependent upper current set-point and the charge voltage is between the lower voltage set-point and the upper voltage set-point, the charge current is reduced.

主权项

1. A method, comprising:
determining a lower voltage set-point, an upper voltage set-point, a temperature-dependent upper current set-point, a time limit value, and a lower current hysteresis threshold set-point based on a measured temperature of a battery; providing a charge current from a battery charging circuit; determining if a charge voltage is above the lower voltage set-point and below the upper voltage set-point; and determining whether the charge current exceeds the temperature-dependent upper current set-point, and if so, starting a timer if, in addition to the charge current exceeding the temperature-dependent upper current set-point, the charge voltage is between the lower voltage set-point and the upper voltage set-point; and, if the timer reaches the time limit value while the charge current exceeds the temperature-dependent upper current set-point and the charge voltage is between the lower voltage set-point and the upper voltage set-point, reducing the charge current below the lower current hysteresis threshold set-point when the timer expires.