Battery voltage reduction
AssigneeGeneral Motors Corporation
InventorsNick S. Kapsokavathis, David W. Walters, Marvin E. Carpenter
Life of this patent
Estimating the term…
Abstract
A regulator voltage control includes measuring a current of a battery, determining a state of charge (SOC) of the battery based on the current, and determining a nominal optimum charging voltage as a function of the SOC of the battery. The nominal optimum charging voltage is converted to a % duty cycle, and a generator is operated relative to the % duty cycle for charging the battery. The nominal optimum charging voltage is reduced when either a battery charge current is below a predetermined value, or a current drawing accessory is turned on.
Claims23
A method for regulating voltage in a vehicle electrical system comprising:
- estimating a temperature of a battery;
- determining a voltage of said battery;
- measuring current supplied by said battery;
- and
- determining a state of charge (SOC) of said battery based on said temperature, said voltage, and said current.
A regulator voltage control method, comprising:
- measuring current supplied by a battery;
- determining a state of charge (SOC) of said battery based on said current;
- determining a nominal optimum charging voltage as a function of said SOC of said battery;
- converting said nominal optimum charging voltage to a % duty cycle;
- charging said battery using a generator based on said % duty cycle;
- and
- reducing said nominal optimum charging voltage when one of a battery charge current is below a predetermined value and an accessory is turned on.
Dependencies are inferred from the claim text.