Method and system for controllably transferring energy from a high voltage bus to a low voltage bus in a hybrid electric vehicle
First Claim
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1. A method for operating a hybrid electric vehicle (HEV) having a low voltage bus, a high voltage bus, and a DC convertor electrically coupling the low and high voltage busses, the method comprising:
- controllably transferring energy from the high voltage bus to the low voltage bus during prestart of the high voltage bus by controlling energy flow through the DC/DC converter.
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Abstract
A method and system for controllably transferring energy from a high voltage bus to a low voltage bus in a hybrid electric vehicle. A vehicle system controller controls a DC/DC converter coupled between the high voltage bus and the low voltage bus to control the transfer of energy therebetween.
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Citations
22 Claims
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1. A method for operating a hybrid electric vehicle (HEV) having a low voltage bus, a high voltage bus, and a DC convertor electrically coupling the low and high voltage busses, the method comprising:
controllably transferring energy from the high voltage bus to the low voltage bus during prestart of the high voltage bus by controlling energy flow through the DC/DC converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 21, 22)
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10. A vehicle system controller for operating a hybrid electric vehicle (HEV) having a low voltage bus for providing power to accessory loads and a high voltage bus electrically coupled to the low voltage bus by a DC/DC converter, the high voltage bus providing power for electric driving of the vehicle, the controller comprising:
means for controllably transferring energy from the high voltage bus to the low voltage bus during prestart of the high voltage bus by controlling energy flow through the DC/DC converter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A hybrid electric vehicle system, the system comprising:
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an internal combustion engine; a generator/motor for electrically starting the internal combustion engine; a high voltage battery for storing high voltage energy; a high voltage bus coupled between the generator/motor and the high voltage battery; contactors coupled between the high voltage battery and the high voltage bus to electrically isolate the high voltage battery from the high voltage bus when opened; a precharging device for precharging the high voltage bus prior to closing of the opened contactors; a low voltage battery for storing low voltage energy and powering accessories; a low voltage bus coupled between the battery and the accessories; a DC/DC converter coupled between the high voltage bus and the low voltage bus, the DC/DC converter being isolated from the high voltage battery when the contactors are opened; and a vehicle system controller, the vehicle system controller including instructions for controllably transferring energy from the high voltage bus to the low voltage bus during prestart of the high voltage bus by controlling energy flow through the DC/DC converter. - View Dependent Claims (20)
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Specification