Battery state of function prediction with warm/cold cranking recognition and self-correction
First Claim
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1. A system for a vehicle having an engine and a battery, comprising:
- a memory having a first current expected to be provided by the battery for restarting the engine during a warm cranking event and a second current expected to be provided by the battery for restarting the engine during a cold cranking event;
a controller to predict a first minimum voltage of the battery expected during the warm cranking event based on the first current and a second minimum voltage of the battery expected during the cold cranking event based on the second current;
wherein the controller further to detect a new cranking event as being the warm cranking event as a measured current provided by the battery during the new cranking event is closer to the first current than to the second current, generate a correction factor based on a difference between a measured voltage of the battery during the new cranking event and the first minimum voltage, and predict a third minimum voltage of the battery expected during a next warm cranking event based on the first current and the correction factor; and
wherein the controller further to enable the engine to be stopped ahead of a subsequent cranking event following the new cranking event when the second minimum voltage of the battery is greater than a minimum voltage threshold and to prevent the engine from being stopped ahead of the subsequent cranking event following the new cranking event when the second minimum voltage of the battery is less than the minimum voltage threshold.
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Abstract
A system for a vehicle having an engine and a battery includes a memory and a controller. The memory has a first current expected to be provided by the battery for restarting the engine during a warm cranking event and a second current expected to be provided by the battery for restarting the engine during a cold cranking event. The controller to predict a first minimum voltage of the battery expected during the warm cranking event based on the first current and a second minimum voltage of the battery expected during the cold cranking event based on the second current.
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Citations
13 Claims
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1. A system for a vehicle having an engine and a battery, comprising:
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a memory having a first current expected to be provided by the battery for restarting the engine during a warm cranking event and a second current expected to be provided by the battery for restarting the engine during a cold cranking event; a controller to predict a first minimum voltage of the battery expected during the warm cranking event based on the first current and a second minimum voltage of the battery expected during the cold cranking event based on the second current; wherein the controller further to detect a new cranking event as being the warm cranking event as a measured current provided by the battery during the new cranking event is closer to the first current than to the second current, generate a correction factor based on a difference between a measured voltage of the battery during the new cranking event and the first minimum voltage, and predict a third minimum voltage of the battery expected during a next warm cranking event based on the first current and the correction factor; and wherein the controller further to enable the engine to be stopped ahead of a subsequent cranking event following the new cranking event when the second minimum voltage of the battery is greater than a minimum voltage threshold and to prevent the engine from being stopped ahead of the subsequent cranking event following the new cranking event when the second minimum voltage of the battery is less than the minimum voltage threshold. - View Dependent Claims (2, 3, 4, 5)
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6. A vehicle comprising:
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an engine; a battery; a memory having a first current expected to be provided by the battery for restarting the engine during a warm cranking event and a second current expected to be provided by the battery for restarting the engine during a cold cranking event; a controller to predict a first minimum voltage of the battery expected during the warm cranking event based on the first current and a second minimum voltage of the battery expected during the cold cranking event based on the second current; wherein the controller further to detect a new cranking event as being the cold cranking event as a measured current provided by the battery during the new cranking event is closer to the second current than to the first current, generate a correction factor based on a difference between a measured voltage of the battery during the new cranking event and the second minimum voltage, and predict a fourth minimum voltage of the battery expected during a next cold cranking event based on the second current and the correction factor; and wherein the controller further to enable the engine to be stopped ahead of a subsequent cranking event following the new cranking event when the fourth minimum voltage of the battery is greater than a minimum voltage threshold and to prevent the engine from being stopped ahead of the subsequent cranking event following the new cranking event when the fourth minimum voltage of the battery is less than the minimum voltage threshold. - View Dependent Claims (7, 8, 9, 10)
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11. A method for a vehicle having an engine and a battery, comprising:
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storing in a memory a first current expected to be provided by the battery for restarting the engine during a warm cranking event and a second current expected to be provided by the battery for restarting the engine during a cold cranking event; predicting a first minimum voltage of the battery expected during the warm cranking event based on the first current and a second minimum voltage of the battery expected during the cold cranking event based on the second current; detecting a new cranking event as being the warm cranking event as a measured current provided by the battery during the new cranking event is closer to the first current than to the second current generating a correction factor based on a difference between a measured voltage of the battery during the new cranking event and the first minimum voltage; predicting a third minimum voltage of the battery expected during a next warm cranking event based on the first current and the correction factor; enabling the engine to be stopped ahead of a subsequent cranking event following the new cranking event when the second minimum voltage of the battery is greater than a minimum voltage threshold; and preventing the engine from being stopped ahead of the subsequent cranking event following the new cranking event when the second minimum voltage of the battery is less than the minimum voltage threshold. - View Dependent Claims (12, 13)
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Specification