System and method of maintaining high voltage battery charging with detected auxiliary battery fault
First Claim
1. An electric vehicle (EV) auxiliary battery current fault system, comprising:
- a battery maintenance electronic control unit (ECU);
an auxiliary battery sensor communicatively coupled to an auxiliary battery and the battery maintenance ECU;
a voltage sensor communicatively coupled to a main battery and the battery maintenance ECU;
a battery isolation switch;
a low voltage bus communicatively coupled to at least one of the main battery, the auxiliary battery, the battery isolation switch, and a DC to DC converter; and
an auxiliary battery sensor and controller communicatively coupled to the auxiliary battery and the battery maintenance ECU.
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Accused Products
Abstract
A system using a computer to be configured to perform particular actions by virtue of having software, firmware, hardware, or a combination installed. One aspect includes a system, programmed to receive a fault signal from an auxiliary battery sensor. The system also determines if a low voltage set point is greater than the main battery voltage, and sends an open switch signal to a battery isolation switch if the low voltage set point is greater than the main battery voltage value. The system will send an auxiliary set point signal to an auxiliary battery charger to maintain a low voltage. The system will receive a current signal from an auxiliary battery sensor to indicate an auxiliary battery current value. The system also determines if the auxiliary battery current is above a maximum current value, and send a disable auxiliary battery maintenance signal to the auxiliary battery charger.
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Citations
20 Claims
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1. An electric vehicle (EV) auxiliary battery current fault system, comprising:
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a battery maintenance electronic control unit (ECU); an auxiliary battery sensor communicatively coupled to an auxiliary battery and the battery maintenance ECU; a voltage sensor communicatively coupled to a main battery and the battery maintenance ECU; a battery isolation switch; a low voltage bus communicatively coupled to at least one of the main battery, the auxiliary battery, the battery isolation switch, and a DC to DC converter; and an auxiliary battery sensor and controller communicatively coupled to the auxiliary battery and the battery maintenance ECU. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system, comprising a computer having a processor and a memory, the memory storing instructions executable by the processor such that the computer is programmed to:
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receive a fault signal from an auxiliary battery sensor and controller communicatively coupled to an auxiliary battery; receive a voltage signal from a voltage sensor communicatively coupled to a main battery, wherein the voltage signal indicates a main battery voltage value; determine if a low voltage set point value is greater than the main battery voltage value; send an open switch signal to a battery isolation switch if the low voltage set point is greater than the main battery voltage value; send an auxiliary set point signal to an auxiliary battery charger to maintain a low voltage value on a low voltage bus of an electric vehicle (EV); receive a current signal from an auxiliary battery current sensor communicatively coupled to the auxiliary battery, wherein the current signal indicates an auxiliary battery current value; determine if the auxiliary battery current value is above an auxiliary battery maximum current value; and send a disable auxiliary battery maintenance signal to the auxiliary battery charger. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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receiving a fault signal from an auxiliary battery sensor and controller communicatively coupled to an auxiliary battery; receiving a voltage signal from a voltage sensor communicatively coupled to a main battery, wherein the voltage signal indicates a main battery voltage value; determining if a low voltage set point value is greater than the main battery voltage value; sending an open switch signal to a battery isolation switch if the low voltage set point is greater than the main battery voltage value; sending an auxiliary set point signal to an auxiliary battery charger to maintain a low voltage value on a low voltage bus of an electric vehicle (EV); receiving a current signal from an auxiliary battery current sensor communicatively coupled to the auxiliary battery, wherein the current signal indicates an auxiliary battery current value; determining if the auxiliary battery current value is above an auxiliary battery maximum current value; and sending a disable auxiliary battery maintenance signal to the auxiliary battery charger. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification