Method and system for use with a vehicle electric storage system
First Claim
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1. A method for controlling operation of a vehicle having an electric powertrain and an electric energy storage system (ESS) in communication with the electric powertrain, the ESS including a capacitor, a battery, and a DC/DC converter, the method comprising:
- monitoring a state of charge (SOC) of the capacitor;
controlling the DC/DC converter to allow only the capacitor to discharge to the electric powertrain when the capacitor SOC is greater than or equal to a first threshold;
controlling the DC/DC converter to allow both the capacitor and battery to discharge to the electric powertrain when the capacitor SOC is less than the first threshold; and
controlling the DC/DC converter to allow only the battery to discharge to the electric powertrain when the capacitor SOC is less than a second threshold.
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Abstract
A method and system for controlling a vehicle having an electric powertrain and an electric energy storage system. The electric energy storage system includes a capacitor, DC/DC converter, and a battery. The electric energy storage system is controlled to maximize use of the capacitor relative to use of the battery.
35 Citations
15 Claims
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1. A method for controlling operation of a vehicle having an electric powertrain and an electric energy storage system (ESS) in communication with the electric powertrain, the ESS including a capacitor, a battery, and a DC/DC converter, the method comprising:
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monitoring a state of charge (SOC) of the capacitor; controlling the DC/DC converter to allow only the capacitor to discharge to the electric powertrain when the capacitor SOC is greater than or equal to a first threshold; controlling the DC/DC converter to allow both the capacitor and battery to discharge to the electric powertrain when the capacitor SOC is less than the first threshold; and controlling the DC/DC converter to allow only the battery to discharge to the electric powertrain when the capacitor SOC is less than a second threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for use with an electric powertrain of a vehicle, comprising:
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an ESS in communication with the electric powertrain and including a capacitor, a battery, and a DC/DC converter; and a controller operable for; (i) monitoring the stage of charge (SOC) of the capacitor; (ii) controlling the DC/DC converter to allow only the capacitor to discharge to the electric powertrain when the capacitor SOC is greater than or equal to a first threshold; (iii) controlling the DC/DC converter to allow both the capacitor and battery to discharge to the electric powertrain when the capacitor SOC is less than the first threshold; and (iv) controlling the DC/DC converter to allow only the battery to discharge to the electric powertrain when the capacitor SOC is less than a second threshold. - View Dependent Claims (13, 14)
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15. For use with a vehicle-based electric powertrain connected serially in order to a capacitor, a DC/DC converter, and a battery, a method of controlling energy flow comprising:
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discharging only the capacitor to the powertrain when capacitor SOC is greater than a first threshold discharging the capacitor and battery to the powertrain when capacitor SOC is less than the first threshold; and discharging only the battery to the powertrain when capacitor SOC is less than a second threshold.
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Specification