Method and arrangement for supplying quiescent current to a vehicle having a multi-voltage on-board electrical system
AssigneeDaimlerChrysler AG
InventorsRainer Mäckel, Thomas Schulz
Life of this patent
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Abstract
A method and arrangement for supplying quiescent current to a vehicle having a multi-voltage on-board electrical system with at least two on-board electrical subsystems having different voltage levels during normal operation. The voltage levels of the on-board electrical subsystems are reduced to a uniform value when the engine is stationary.
Claims12
A method for supplying quiescent current to a vehicle having a multi-voltage on-board electrical system with at least two on-board electrical subsystems, comprising the steps of:
- simultaneously providing different voltage levels to each of said at least two on-board electrical subsystems during normal operation of an engine of said vehicle;
- and
- when the engine is off, reducing voltage levels of each of said at least two on-board electrical subsystems to a uniform value which is substantially equal to a lowest one of said different voltage levels.
An arrangement for supplying quiescent current in a multi-voltage electrical system, said arrangement comprising:
- at least two electrical subsystems, having respective different voltage levels during a first time period of the multivoltage electrical system;
- a first and second isolator element for respectively isolating each of electrical subsystems from respectively associated energy storage means, during a second time period;
- and
- a connection element for connecting each electrical subsystems to one of the energy storage means when a voltage of one of said subsystems falls below a predetermined level during said second time period.
Dependencies are inferred from the claim text.