Method and system for charging an auxilary battery in a plug-in electric vehicle
First Claim
1. A method of charging an auxiliary battery in a plug-in electric vehicle including an onboard charging system, the method comprising:
- charging the auxiliary battery to an upper charge level using an external power source thereby reducing energy used from the onboard charging system to charge the auxiliary battery during a drive mode of the vehicle, the upper charge level being at least one of;
approximately an upper level of a predetermined operating range of charge levels; and
greater than the predetermined operating range of charge levels;
allowing the auxiliary battery to discharge to a lower charge level during the drive mode of the vehicle, the lower charge level being at least one of;
approximately a lower level of the predetermined operating range of charge levels; and
less than the predetermined operating range of charge levels;
wherein the lower charge level is based on a time that the vehicle is predicted to be in an off state.
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Accused Products
Abstract
A system and method is provided for charging an auxiliary battery in a plug-in electric vehicle with an onboard charging system. The auxiliary battery has a predetermined operating range of charge levels. The auxiliary battery is charged to an upper charge level using an external power source thereby reducing energy used from the onboard charging system to charge the auxiliary battery during a drive mode of the vehicle. The upper charge level may be substantially similar to an upper level of the predetermined operating range of charge levels or greater than the predetermined operating range of charge levels. The auxiliary battery may be allowed to discharge to a lower charge level, which may be substantially similar to a lower level of the predetermined operating range of charge levels or less than the predetermined operating range of charge levels.
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Citations
18 Claims
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1. A method of charging an auxiliary battery in a plug-in electric vehicle including an onboard charging system, the method comprising:
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charging the auxiliary battery to an upper charge level using an external power source thereby reducing energy used from the onboard charging system to charge the auxiliary battery during a drive mode of the vehicle, the upper charge level being at least one of; approximately an upper level of a predetermined operating range of charge levels; and greater than the predetermined operating range of charge levels; allowing the auxiliary battery to discharge to a lower charge level during the drive mode of the vehicle, the lower charge level being at least one of; approximately a lower level of the predetermined operating range of charge levels; and less than the predetermined operating range of charge levels; wherein the lower charge level is based on a time that the vehicle is predicted to be in an off state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for charging an auxiliary battery in a plug-in electric vehicle including an onboard charging system, the auxiliary battery having a predetermined operating range of charge levels, the system comprising:
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at least one logic device configured to determine an upper charge level that is at least one of; approximately an upper level of the predetermined operating range of charge levels; and greater than the predetermined operating range of charge levels; and to charge the auxiliary battery to the upper charge level using an external power source; and to allow the auxiliary battery to discharge to a lower charge level during the drive mode of the vehicle, the lower charge level being at least one of; approximately a lower level of the predetermined operating range of charge levels; and less than the predetermined operating range of charge levels; wherein the lower charge level is based on a predicted time until next charge of the auxiliary battery. - View Dependent Claims (12, 13, 14, 15)
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16. A method of charging an auxiliary battery in a plug-in electric vehicle including an onboard charging system, the method comprising:
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charging the auxiliary battery to an upper charge level using an external power source; and allowing the auxiliary battery to discharge to a lower charge level during the drive mode of the vehicle, the lower charge level being based on a predicted time until next charge of the auxiliary battery. - View Dependent Claims (17)
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18. A method of charging an auxiliary battery in a plug-in electric vehicle including an onboard charging system, comprising:
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charging the auxiliary battery to an upper charge level using an external power source; and allowing the auxiliary battery to discharge to a lower charge level during the drive mode of the vehicle, the lower charge level being based on a time that the vehicle is predicted to be in an off state.
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Specification