Method for monitoring the state of a battery in a motor vehicle
AssigneeFord Global Technologies, LLC
InventorsMark EIFERT, Eckhard KARDEN
Life of this patent
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Abstract
The disclosure relates to a method for monitoring the state of a battery, in which method a battery with an internal short-circuit is identified by an alarm signal of an evaluation unit when the battery current does not fall after the battery has been charged over a long time period, or when the no-load voltage or discharge voltage of the battery drops or rapidly drops after a relatively long charging operation. These two identification methods, which are integrated into two separate algorithms, can be implemented in parallel in an internal short-circuit identification strategy.
Claims17
A method for monitoring the state of a battery of a motor vehicle comprising:
- charging the battery by a power supply for at least a defined time period;
- and
- after the time period elapses, selectively executing a first or second algorithm depending on a current operating mode of the motor vehicle, wherein
- in the first algorithm, the battery charging current is measured and transmitted to an evaluation unit, and the evaluation unit generates an alarm signal if the battery charging current does not drop below a defined limit value, and
- in the second algorithm, the power supply is switched off or is adjusted to effect a battery discharge operation, and a no-load voltage or battery voltage under load is measured and transmitted to the evaluation unit, and the evaluation unit generates the alarm signal if the no-load voltage or the battery voltage under load lies below another defined limit value.
A method comprising:
- by a processor,
- charging a battery of a vehicle for at least a time period, and
- after expiration of the time period,
- generating an alarm in response to the vehicle being in operating mode and charge current not falling below a threshold current, and
- generating the alarm in response to the vehicle being in parked mode and a no-load voltage of the battery being less than a threshold voltage.
A method comprising:
- by a processor,
- charging a battery of a vehicle for at least a time period, and
- after expiration of the time period,
- generating an alarm in response to the vehicle being in operating mode and charge current not falling below a threshold current, and
- generating the alarm in response to the vehicle being in parked mode and a voltage of the battery under load being less than a threshold voltage.
Dependencies are inferred from the claim text.