System and method for controlling LDC voltage of hybrid vehicle
First Claim
1. A method for controlling a low-voltage direct current-direct current (DC-DC) converter (LDC) voltage of a hybrid vehicle having a high-voltage battery and an auxiliary battery separately, comprising:
- determining, by a controller, whether the hybrid vehicle is driven in a regenerative braking mode;
determining, by the controller, whether a value of a state of charge (SOC) of the auxiliary battery is equal to or greater than a first critical value set as a value charging of the auxiliary battery is unnecessary during the driving in the regenerative braking mode; and
when the value of the SOC of the auxiliary battery is equal to or greater than the set first critical value, switching, by the controller, the driving mode of the vehicle from the regenerative braking mode to an electric vehicle (EV) mode, and variably adjusting an LDC target voltage based on the voltage of the auxiliary battery in the EV mode,wherein the LDC target voltage is adjusted to be decreased when the hybrid vehicle enters into the regenerative braking mode in which the SOC the auxiliary battery is equal to or greater than a predetermined value.
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Accused Products
Abstract
A system and method for controlling a low-voltage DC-DC converter (LDC) voltage of a hybrid vehicle are provided. The LDC voltage is optimally adjusted based on which driving mode the vehicle enters, thereby improving fuel efficiency. The method includes determining whether the hybrid vehicle is driven in a regenerative braking mode and whether a value of a state of charge (SOC) of an auxiliary battery is equal to or greater than a first critical value set as a value when charging of the auxiliary battery is unnecessary during the driving in the regenerative braking mode. When the value of the SOC of the auxiliary battery is equal to or greater than the predetermined first critical value, the driving mode is switched from the regenerative braking mode to an electric vehicle (EV) mode, and to variably adjust an LDC target voltage in the EV mode.
8 Citations
12 Claims
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1. A method for controlling a low-voltage direct current-direct current (DC-DC) converter (LDC) voltage of a hybrid vehicle having a high-voltage battery and an auxiliary battery separately, comprising:
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determining, by a controller, whether the hybrid vehicle is driven in a regenerative braking mode; determining, by the controller, whether a value of a state of charge (SOC) of the auxiliary battery is equal to or greater than a first critical value set as a value charging of the auxiliary battery is unnecessary during the driving in the regenerative braking mode; and when the value of the SOC of the auxiliary battery is equal to or greater than the set first critical value, switching, by the controller, the driving mode of the vehicle from the regenerative braking mode to an electric vehicle (EV) mode, and variably adjusting an LDC target voltage based on the voltage of the auxiliary battery in the EV mode, wherein the LDC target voltage is adjusted to be decreased when the hybrid vehicle enters into the regenerative braking mode in which the SOC the auxiliary battery is equal to or greater than a predetermined value. - View Dependent Claims (2, 3, 4)
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5. A system for controlling a low-voltage direct current-direct current (DC-DC) converter (LDC) voltage of a hybrid vehicle having a high-voltage battery and an auxiliary battery separately, comprising:
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a memory configured to store program instructions; and a processor configured to execute the program instructions, the program instructions when executed configured to; determine whether the hybrid vehicle is driven in a regenerative braking mode; determine whether a value of a state of charge (SOC) of the auxiliary battery is equal to or greater than a first critical value set as a value charging of the auxiliary battery is unnecessary during the driving in the regenerative braking mode; and when the value of the SOC of the auxiliary battery is equal to or greater than the set first critical value switch the driving mode of the vehicle from the regenerative braking mode to an electric vehicle (EV) mode, and variably adjusting an LDC target voltage based on the voltage of the auxiliary battery in the EV mode, wherein the LDC target voltage is adjusted to be decreased when the hybrid vehicle enters into the regenerative braking mode in which the SOC of the auxiliary battery is equal to or greater than a predetermined value. - View Dependent Claims (6, 7, 8)
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9. A non-transitory computer readable medium containing program instructions executed by a processor or controller, the computer readable medium comprising:
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program instructions that determine whether a hybrid vehicle having a high-voltage battery and an auxiliary battery separately is driven in a regenerative braking mode; program instructions that determine whether a value of a state of charge (SOC) of an auxiliary battery is equal to or greater than a first critical value set as a value charging of the auxiliary battery is unnecessary during the driving in the regenerative braking mode; and program instructions that when the value of the SOC of the auxiliary battery is equal to or greater than the set first critical value switch the driving mode of the vehicle from the regenerative braking mode to an electric vehicle (EV) mode, and variably adjusting a low-voltage direct current-direct current converter (LDC) target voltage based on the voltage of the auxiliary battery in the EV mode, wherein the LDC target voltage is adjusted to be decreased when the hybrid vehicle enters into the regenerative braking mode in which the SOC of the auxiliary battery is equal to or greater than a predetermined value. - View Dependent Claims (10, 11, 12)
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Specification