Vehicle energy storage system control methods and method for determining battery cycle life projection for heavy duty hybrid vehicle applications
First Claim
1. A method for resetting a state of charge (SOC) calculation for a designated energy storage bank of an energy storage system of a vehicle, the method comprising:
- during operation of the vehicle, completely discharging and completely charging the designated energy storage bank;
maintaining the designated energy storage bank at a predetermined high terminal voltage for a specified period of time; and
following said specified period of time, defining a calculated, reset SOC for the designated energy storage bank to be a known SOC capacity.
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Abstract
A method for equalizing a storage parameter for a vehicle energy storage system having one or more energy storage banks associated therewith includes identifying a quiescent period of operation for the vehicle, and determining whether the value of a defined storage quantity for a first energy storage bank differs from the value of the defined storage quantity for a second energy storage bank by a threshold amount. During the quiescent period of operation, one of the first and second energy storage banks is discharged and the other of the first and second energy storage banks is charged. The one of the first and second energy storage banks corresponds to the bank having the value of the defined storage quantity exceeding the value of the defined storage quantity of the other of the first and second energy storage banks.
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Citations
15 Claims
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1. A method for resetting a state of charge (SOC) calculation for a designated energy storage bank of an energy storage system of a vehicle, the method comprising:
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during operation of the vehicle, completely discharging and completely charging the designated energy storage bank; maintaining the designated energy storage bank at a predetermined high terminal voltage for a specified period of time; and following said specified period of time, defining a calculated, reset SOC for the designated energy storage bank to be a known SOC capacity. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling two or more energy storage banks in a vehicle energy storage system, the method comprising:
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determining a remaining life cycle for each of the energy storage banks; and allocating a total amount of commanded charging and discharging power commanded among each of the energy storage banks in accordance with said determined remaining life cycle thereof, wherein a flow of said power is prioritized in accordance with the two or more energy storage banks having the highest remaining life cycle. - View Dependent Claims (7, 8)
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9. A method for characterizing and projecting remaining cycle life for vehicle storage battery, the method comprising:
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performing a series of initial battery characterization tests;
wherein said series of initial battery characterization tests further comprises;a first test, said first test comprising an initial commissioning charge and capacity test; a second test, said second test comprising a full recharge and partial discharge test; and a third test, said third test comprising a partial charge and partial discharge test;
wherein during the performance of said third test, if an output voltage of the storage battery drops to a first cut-off value, then said third test is aborted and said first test is repeated;performing a series of periodic battery tests during the operating life of the vehicle storage battery; comparing the results of said periodic battery tests with said initial battery characterization tests; and projecting a remaining cycle life for the vehicle storage battery. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification