System and method for controlling ultra-capacitor charge and discharge in vehicles with auto start/stop systems
First Claim
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1. A system comprising:
- an ultra-capacitor and battery system comprising a battery, a DC-DC converter, and an ultra-capacitor;
an auto stop/start module configured to perform an auto stop event of an engine of a vehicle and an auto start event of the engine of the vehicle based on operating parameters while an ignition is ON; and
a voltage monitoring module configured to, in response to a request for the auto start event,selectively discharge the ultra-capacitor during cranking to compensate for a voltage dip in a battery voltage of the battery for the auto start event,calculate a plurality of voltage delta values by generating a difference between the battery voltage prior to the cranking and the battery voltage at predetermined time intervals during the cranking, wherein the plurality of voltage delta values are accumulated while the ultra-capacitor discharges during the cranking,calculate a voltage value based on the plurality of voltage delta values, andselectively disable the auto stop/start module when the voltage value is less than a predetermined threshold,wherein the voltage value comprises an average of the plurality of voltage delta values.
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Abstract
A system includes an ultra-capacitor and battery system comprising a battery, a DC-DC converter, and an ultra-capacitor. An auto stop/start module is configured to perform an auto stop event of an engine of a vehicle and an auto start event of the engine of the vehicle based on operating parameters while an ignition is ON. A voltage monitoring module is configured to, in response to a request for an auto start event, selectively discharge the ultra-capacitor during cranking for the auto start event, accumulate a plurality of voltage delta values while the ultra-capacitor discharges during the cranking, and selectively disable the auto stop/start module based on the plurality of voltage delta values.
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Citations
13 Claims
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1. A system comprising:
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an ultra-capacitor and battery system comprising a battery, a DC-DC converter, and an ultra-capacitor; an auto stop/start module configured to perform an auto stop event of an engine of a vehicle and an auto start event of the engine of the vehicle based on operating parameters while an ignition is ON; and a voltage monitoring module configured to, in response to a request for the auto start event, selectively discharge the ultra-capacitor during cranking to compensate for a voltage dip in a battery voltage of the battery for the auto start event, calculate a plurality of voltage delta values by generating a difference between the battery voltage prior to the cranking and the battery voltage at predetermined time intervals during the cranking, wherein the plurality of voltage delta values are accumulated while the ultra-capacitor discharges during the cranking, calculate a voltage value based on the plurality of voltage delta values, and selectively disable the auto stop/start module when the voltage value is less than a predetermined threshold, wherein the voltage value comprises an average of the plurality of voltage delta values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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providing an ultra-capacitor and battery system comprising a battery, a DC-DC converter, and an ultra-capacitor; performing an auto stop event of an engine of a vehicle and an auto start event of the engine of the vehicle based on operating parameters while an ignition is ON; and in response to a request for the auto start event; discharging the ultra-capacitor during cranking to compensate for a voltage dip in a battery voltage of the battery for the auto start event, accumulating a plurality of voltage delta values while the ultra-capacitor discharges during the cranking, wherein the plurality of voltage delta values are calculated by generating a difference between the battery voltage prior to the cranking and the battery voltage at predetermined time intervals during the cranking, calculating an average of the plurality of voltage delta values, and disabling auto stop/starts when the average is less than a predetermined threshold. - View Dependent Claims (9, 10, 11, 12)
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13. A system comprising:
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an ultra-capacitor and battery system comprising a battery, a DC-DC converter, an ultra-capacitor, and an ultra-capacitor controller operatively connected to a first switch disposed between the ultra-capacitor and the battery and a second switch disposed between the battery and ground; an auto stop/start module configured to perform an auto stop event of an engine of a vehicle and an auto start event of the engine of the vehicle based on operating parameters while an ignition is ON; and a voltage monitoring module configured to, in response to a request for the auto start event, selectively discharge the ultra-capacitor during cranking for the auto start event to compensate for a voltage dip in a battery voltage of the battery, calculate a plurality of voltage delta values by generating a difference between the battery voltage prior to the cranking and the battery voltage at predetermined time intervals during the cranking, wherein the plurality of voltage delta values are accumulated while the ultra-capacitor discharges during the cranking, calculate an average of the plurality of voltage delta values, compare the average and a predetermined threshold, and selectively disable the auto stop/start module when the average is less than the predetermined threshold, wherein the ultra-capacitor controller is configured to selectively close the first switch and selectively opens the second switch allowing the ultra-capacitor to compensate for the voltage dip in the battery voltage of the battery during the auto start event.
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Specification