Vehicle energy storage system control methods and method for determining battery cycle life projection for heavy duty hybrid vehicle applications

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 said defined storage quantity for a second energy storage bank by a threshold amount. During the quiescent period of operation, one of said 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 said first and second energy storage banks.

1 . A method for equalizing a storage parameter for a vehicle energy storage system having two or more energy storage banks associated therewith, the method comprising: 
 identifying a quiescent period of operation for the vehicle;    determining whether the value of a defined storage quantity for a first energy storage bank differs from the value of said defined storage quantity for a second energy storage bank by a threshold amount; and    during said quiescent period of operation, discharging one of said first and second energy storage banks and charging the other of said first and second energy storage banks;    wherein said one of said first and second energy storage banks corresponds to the bank having the value of said defined storage quantity exceeding the value of said defined storage quantity of said other of said first and second energy storage banks.    
   
   
       2 . The method of  claim 1 , wherein said defined storage quantity comprises at least one of: stored energy, relative stored energy, stored energy minus rating, stored charge, relative stored charge, and stored charge minus rating.  
   
   
       3 . A method for equalizing a storage parameter for a vehicle energy storage system having two or more energy storage banks associated therewith, the method comprising: 
 identifying an active period of operation for the vehicle;    determining whether the value of a defined storage quantity for a first energy storage bank differs from the value of said defined storage quantity for a second energy storage bank by a threshold amount;    during a motoring operation of the vehicle, applying discharging energy from said one of said first and second energy storage banks to said motoring operation if the value of said defined storage quantity for said one of said first and second energy storage banks differs from the value of said defined storage quantity for said other of said first and second energy storage banks by said threshold amount.    
   
   
       4 . The method of  claim 3 , further comprising: 
 during a dynamic braking operation of the vehicle, applying charging energy generated by dynamic braking operation to said other of said first and second energy storage banks if the value of said defined storage quantity for said one of said first and second energy storage banks differs from the value of said defined storage quantity for said other of said first and second energy storage banks by said threshold amount.    
   
   
       5 .- 17 . (canceled)  
   
   
       18 . A method for generating an energy storage control parameter for a vehicle energy storage system, the method comprising: 
 receiving energy storage electrical property information; and    estimating, from said energy storage electrical property information, a storage bank temperature.    
   
   
       19 . The method of  claim 18 , wherein said energy storage electrical property information includes at least one of: internal resistance, change in internal resistance, equivalent series resistance, terminal voltage, and open circuit recovery time constant.  
   
   
       20 . The method of  claim 18 , wherein said estimating a storage bank temperature further comprises receiving one or more actual temperature measurements within the vehicle energy storage system.  
   
   
       21 . The method of  claim 18 , wherein said estimating a storage bank temperature further comprises utilizing at least one of: a battery cell thermal resistance value, a battery cell heat capacity value, a battery module thermal resistance value, a battery module heat capacity value, a battery assembly thermal resistance value, and a battery assembly heat capacity value.  
   
   
       22 .- 23 . (canceled)  
   
   
       24 . A method for controlling the operating range of one or more energy storage banks in a vehicle energy storage system, the method comprising: 
 determining a point at which the energy storage bank has reached a threshold value with respect to an end of life (EOL) condition; and    responsive to said threshold value, reducing at least one of an energy storage bank operating parameter and an energy storage bank operating range.    
   
   
       25 . The method of  claim 24 , wherein the energy storage bank further comprises a storage battery and said at least one energy storage bank operating parameter and said at least one energy storage bank operating range further comprises at least one of: a charging terminal voltage, a maximum state of charge (SOC), a maximum current flow, a maximum power flow, a maximum stored energy, an operating range between minimum and maximum SOC, an operating range between minimum and maximum stored energy, an operating range between minimum and maximum stored charge, an operating range between minimum and maximum terminal voltage.  
   
   
       26 . The method of  claim 25 , wherein said threshold value with respect to an end of life (EOL) condition is based upon at least one of: a total number of ampere-hours charged or discharged, a total number of kilowatt-hours charged or discharged, a total number of operating hours in charge or discharge mode, an elapsed time in operation, a number of vehicle missions completed, a total vehicle distance traveled, a vehicle total fuel consumed or energy supplied from an engine, an increase in calculated battery internal resistance or impedance, or reduction of charge or energy used to equalize a state of charge (SOC) calculation of said battery.  
   
   
       27 .- 39 . (canceled)