Vehicle Power Management System
First Claim
1. A vehicle power management system (VPMS) for controlling a charging voltage of a battery in a vehicle, wherein the vehicle includes a charging source that provides a selected voltage to the battery, the system comprising:
- a battery monitor coupled to the battery for determining a state of charge (SOC) of the battery, a battery temperature, and a battery charging current; and
a VPMS controller receiving periodic messages from the battery monitor including measurement results of the SOC, battery temperature, and battery charging current from the battery monitor, wherein the VPMS controller evaluates the messages from the battery monitor to determine a charge mode;
wherein the VPMS controller enters a rapid charge mode when the SOC is less than a first threshold, wherein the VPMS controller selects a target rapid charge voltage, compensates the target rapid charge voltage for the battery temperature, and transmits the compensated rapid charge voltage to the charging source, and wherein the VPMS controller compares the battery charging current to an overcurrent threshold and if the battery charging current exceeds the overcurrent threshold then the VPMS controller transmits a reduced charge voltage to the charging source;
wherein the VPMS controller enters a normal charge mode when the SOC is greater than the first threshold and less than a second threshold, wherein the VPMS controller selects a target normal charge voltage which is less than the target rapid charge voltage, compensates the target normal charge voltage for the battery temperature, and transmits the compensated normal charge voltage to the charging source;
wherein the VPMS controller enters a trickle charge mode when the SOC is greater than the second threshold, wherein the VPMS controller selects a target trickle charge voltage which is less than the target normal charge voltage, compensates the target trickle charge voltage for the battery temperature, and transmits the compensated trickle charge voltage to the charging source;
wherein the VPMS controller enters the trickle charge mode in the event of a failure to receive the SOC, battery temperature, or battery charging current from the battery monitor.
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Accused Products
Abstract
A vehicle power management system (VPMS) controls a charging voltage of a battery in a vehicle, wherein a VPMS controller evaluates state-of-charge (SOC), battery temperature, and battery charging current to determine a charge mode. A rapid charge mode is used when the SOC is less than a first threshold, wherein the VPMS controller selects a target rapid charge voltage, compensates the target rapid charge voltage for the battery temperature, and transmits the compensated rapid charge voltage to the charging source. A normal charge mode is used when the SOC is greater than the first threshold and less than a second threshold, wherein a target normal charge voltage is selected and compensated which is less than the target rapid charge voltage. A trickle charge mode is used when the SOC is greater than the second threshold, wherein a target trickle charge voltage is less than the target normal charge voltage. The VPMS controller also enters the trickle charge mode in the event of a failure to receive the SOC, battery temperature, or battery charging current from a battery monitor.
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Citations
16 Claims
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1. A vehicle power management system (VPMS) for controlling a charging voltage of a battery in a vehicle, wherein the vehicle includes a charging source that provides a selected voltage to the battery, the system comprising:
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a battery monitor coupled to the battery for determining a state of charge (SOC) of the battery, a battery temperature, and a battery charging current; and a VPMS controller receiving periodic messages from the battery monitor including measurement results of the SOC, battery temperature, and battery charging current from the battery monitor, wherein the VPMS controller evaluates the messages from the battery monitor to determine a charge mode; wherein the VPMS controller enters a rapid charge mode when the SOC is less than a first threshold, wherein the VPMS controller selects a target rapid charge voltage, compensates the target rapid charge voltage for the battery temperature, and transmits the compensated rapid charge voltage to the charging source, and wherein the VPMS controller compares the battery charging current to an overcurrent threshold and if the battery charging current exceeds the overcurrent threshold then the VPMS controller transmits a reduced charge voltage to the charging source; wherein the VPMS controller enters a normal charge mode when the SOC is greater than the first threshold and less than a second threshold, wherein the VPMS controller selects a target normal charge voltage which is less than the target rapid charge voltage, compensates the target normal charge voltage for the battery temperature, and transmits the compensated normal charge voltage to the charging source; wherein the VPMS controller enters a trickle charge mode when the SOC is greater than the second threshold, wherein the VPMS controller selects a target trickle charge voltage which is less than the target normal charge voltage, compensates the target trickle charge voltage for the battery temperature, and transmits the compensated trickle charge voltage to the charging source; wherein the VPMS controller enters the trickle charge mode in the event of a failure to receive the SOC, battery temperature, or battery charging current from the battery monitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling a charging voltage of a battery in a vehicle, wherein the vehicle includes a charging source that provides a selected voltage to the battery, the method comprising the steps of:
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periodically determining a state of charge (SOC) of the battery, a battery temperature, and a battery charging current; comparing the SOC with a first threshold and a second threshold, wherein the second threshold is greater than the first threshold; entering a rapid charge mode when the SOC is less than the first threshold, wherein the rapid charge mode includes selecting a target rapid charge voltage, compensating the target rapid charge voltage for the battery temperature, and transmitting the compensated rapid charge voltage to the charging source, and wherein the rapid charge mode includes comparing the battery charging current to an overcurrent threshold and if the battery charging current exceeds the overcurrent threshold then transmitting a reduced charge voltage to the charging source; entering a normal charge mode when the SOC is greater than the first threshold and less than the second threshold, wherein the normal charge mode includes selecting a target normal charge voltage which is less than the target rapid charge voltage, compensating the target normal charge voltage for the battery temperature, and transmitting the compensated normal charge voltage to the charging source; entering a trickle charge mode when the SOC is greater than the second threshold, wherein the trickle charge mode includes selecting a target trickle charge voltage which is less than the target normal charge voltage, compensating the target trickle charge voltage for the battery temperature, and transmitting the compensated trickle charge voltage to the charging source; and entering the trickle charge mode in the event of a failure to determine the SOC, battery temperature, or battery charging current. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification