Method of controlling a mild hybrid electric vehicle
AssigneeFord Global Technologies, LLC
InventorsDonatus Andreas Josephine Kees, Cayetano David Fuente San Juan
Life of this patent
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Abstract
A method is disclosed for controlling the operation of a mild hybrid electric vehicle having an engine and high and low voltage power systems selectively connectable via a DC to DC converter. The method comprises whenever possible using only a low voltage battery forming part of the low voltage power system to power low voltage loads during an engine E-stop performed automatically to save fuel and reduce emissions and whenever possible using only a high voltage battery forming part of the high voltage power system to recharge the low voltage battery when the engine is restarted following the E-stop.
Claims12
A method of controlling a vehicle comprising:
- causing by a controller a low voltage (LV) battery to exclusively provide power to one or more LV loads for an entire duration of an automatic engine stop responsive to a state of charge of the LV battery remaining above a threshold, and charging the LV battery with a high voltage (HV) battery responsive to an automatic engine restart.
A mild hybrid electric vehicle having an engine driveably connected to an integrated starter-generator forming part of a high voltage power system that also includes a high voltage battery, a low voltage power system having a low voltage battery and at least one low voltage load, a DC to DC converter to selectively connect the high and low voltage systems together and an electronic controller to control operation of the engine, the high and low voltage power systems and the DC to DC converter, wherein the electronic controller is operable to isolate the high voltage power system from the low voltage power system for an entire duration of an automatic engine stop in order to save fuel and exclusively use the low voltage battery to power the at least one low voltage load while a state of charge of the low voltage battery remains above a threshold, and responsive to an automatic engine restart, to charge the low voltage battery with the high voltage battery.
A vehicle comprising:
- a traction battery;
- an auxiliary battery;
- and
- a controller operable to, for an entire duration of an engine auto stop, isolate the traction battery from the auxiliary battery and exclusively use the auxiliary battery to power an auxiliary load responsive to a state of charge of the auxiliary battery remaining above a threshold, and charge the auxiliary battery with the traction battery responsive to an engine auto start.
Dependencies are inferred from the claim text.