Method for controlling a hybrid vehicle electrical system
AssigneeVolvo Lastvagnar AB
InventorsAnders Lasson, Jerker Lennevi, Henrik Engdahl
Life of this patent
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Abstract
A method for controlling a hybrid vehicle electrical system includes driving the vehicle in a first driving mode where the battery pack is connected to the traction voltage DC-link and the battery pack is supplying the electrical auxiliary units with power, shutting down the power electronics unit in order to cease power delivery from the electric machine to the traction voltage DC-link or to the electric machine from the traction voltage DC-link, disconnecting the battery pack from the traction voltage DC-link by opening the relay, and activating the power electronics unit and controlling output voltage of the power electronics unit to a predetermined level.
Claims18
Method for controlling a hybrid vehicle electrical system comprising one or more electrical auxiliary units, a combustion engine driven electric machine operable as a generator for supplying power to the electrical units via a power electronics unit and via a traction voltage DC-link, and a high voltage battery pack coupled to the traction voltage DC-link by a relay that can be opened to disconnect the battery pack from the high voltage DC-link under fault conditions, the method comprising:
- driving the vehicle in a first driving mode where the battery pack is connected to the traction voltage DC-link and the battery pack is supplying the electrical auxiliary units with power,
- upon receiving a first indication that the battery pack has to be disconnected, and upon receiving also a second indication that the vehicle is in a predetermined vehicle condition, then
- shutting down high current electrical auxiliary units powered from the traction voltage DC-link,
- shutting down the power electronics unit in order to cease power delivery from the electric machine to the traction voltage DC-link or to the electric machine from the traction voltage DC-link,
- disconnecting the battery pack from the traction voltage DC-link by opening the relay, and then
- activating the power electronics unit and controlling output voltage of the power electronics unit to a predetermined level, as long as the electric machine is rotating and supplying power through the power electronics unit to the traction voltage DC-link in order to resume operation of the electrical auxiliary units.
Dependencies are inferred from the claim text.