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US 2021/0172415 A1Published application
Methods and system for operating a vehicle having a dc/dc converter
AssigneeFord Global Technologies, LLC
InventorsAlex O'Connor Gibson, John Eric Rollinger, David Hancock, David Lew, James M. Basile
Life of this patent
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Abstract
A method for operating a vehicle that includes a DC/DC converter is described. In one example, the method includes adjusting an output voltage of the DC/DC converter to increase torque of a belt integrated starter/generator. The output voltage of the DC/DC converter may be adjusted before and during engine cranking.
Claims20
A vehicle operating method, comprising:
- adjusting an output voltage of a DC/DC converter directly coupled to a low voltage bus in response to a speed of an engine during engine cranking via a controller;
- and
- cranking the engine via an electric machine, the electric machine directly coupled to the low voltage bus.
A vehicle electric power system, comprising:
- a high voltage electric energy storage device electrically coupled to a high voltage bus;
- a low voltage electric energy storage device electrically coupled to a low voltage bus;
- a DC/DC converter electrically coupled to the high voltage bus and the low voltage bus;
- a second low voltage electric energy storage device selectively coupled to the low voltage bus via an isolation switch and buffered from the low voltage bus via a diode;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to adjust an output voltage of the DC/DC converter in response to an engine stop position.
3 more elements
A vehicle operating method, comprising:
- adjusting an output voltage of a DC/DC converter directly coupled to a low voltage bus in response to a temperature of an engine while an engine is not rotating via a controller;
- and
- cranking the engine after adjusting the output voltage of the DC/DC converter via an electric machine, the electric machine directly coupled to the low voltage bus.
Dependencies are inferred from the claim text.