HYBRID VEHICLE AND METHOD OF OPERATION
First Claim
1. A vehicle comprising:
- a battery having a time constant;
a motor configured to draw current from the battery and to deliver torque to vehicle wheels;
an internal combustion engine configured to deliver torque to the vehicle wheels; and
a controller configured to respond to a prediction of a future power demand event by waiting until within two time constants of the event and then operating the vehicle to supply a charging current to the battery.
1 Assignment
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Accused Products
Abstract
Some vehicle maneuvers in a hybrid electric vehicle require a high discharge current from the battery. The capacity of a battery to supply a large discharge current depends on, among other things, the recent charge and discharge history. When the demand can be predicted in advance, the vehicle is operated to aggressively charge the battery during a time period close in time to the predicted event. As a result of this aggressive charging, the battery delivers more current to satisfy the power demand without allowing the terminal voltage to decrease below a minimum level than the battery would be capable of delivering at the same state of charge following a period of rest.
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Citations
16 Claims
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1. A vehicle comprising:
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a battery having a time constant; a motor configured to draw current from the battery and to deliver torque to vehicle wheels; an internal combustion engine configured to deliver torque to the vehicle wheels; and a controller configured to respond to a prediction of a future power demand event by waiting until within two time constants of the event and then operating the vehicle to supply a charging current to the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a hybrid electric vehicle having a battery, the battery having a time constant, the method comprising:
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in anticipation of a predicted high power demand event, waiting until within two time constants of the event and then operating the vehicle to supply a charging current to the battery; and in response to occurrence of the event, operating the vehicle to draw a discharge current from the battery for a duration. - View Dependent Claims (9, 10, 11)
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12. A method of operating a hybrid electric vehicle having a battery, the method comprising:
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in anticipation of a predicted power demand event, operating the vehicle to charge the battery to a state of charge that does not exceed a maximum state of charge; and in response to occurrence of the event, drawing a discharge current for a duration such that a battery terminal voltage does not fall below a minimum voltage, wherein drawing the discharge current from the battery for the duration starting from a state of rest at the maximum state of charge when not operating the vehicle results in the battery terminal voltage declining below the minimum voltage. - View Dependent Claims (13, 14, 15, 16)
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Specification