Back to results
US 8,635,037 B2Granted
Battery state-of-charge management method
AssigneeNuvera Fuel Cells, LLC
InventorPierre-Francois Quet
Life of this patent
Estimating the term…
Abstract
Equipment and methods for estimating and regulating the state of charge (SOC) of a battery in a hybrid fuel cell-battery system for use in a moving vehicle. The SOC is continuously estimated and the fuel cell power is regulated to maintain the SOC at a level such that the battery has enough stored energy to operate motors used in the vehicle, and enough spare capacity to accept regenerative energy from these motors during further operations.
Claims20
A method of managing a state of charge of a battery in a hybrid electric power system comprising a fuel cell, the method comprising:
- defining a setpoint;
- calculating an estimated present state of charge of the battery according to the following equation:
- SOC
- ^
-
- (
- k
- )
- =
- SOC
- ^
-
- (
- k
- -
- 1
- )
- +
- T
- s
-
- [
- -
- I
- battery
-
- (
- k
- )
- C
- c
-
- (
- I
- b
- )
- +
- L
-
- (
- V
- bus
-
- (
- k
- )
- -
- V
- ^
- bus
-
- (
- k
- )
- )
- ]
- wherein (k) is the estimated present state of charge of the battery;
- (k−1) is a previously estimated state of charge of the battery;
- Ts is the time in seconds elapsed since the previously estimated state of charge of the battery was calculated;
- Ibattery(k) is the battery current;
- Cc is the battery capacity in Ampere-second;
- L is an observer gain;
- Vbus(k) is the battery voltage;
- and
- {circumflex over (V)}bus is an estimate of the battery voltage based on the previous state of charge estimate (k−1) and on the measured battery current Ibattery(k);
- and
- regulating the state of charge of the battery by manipulating a fuel cell current supplied from the fuel cell to the battery based on the difference between the setpoint and the estimated present state of charge of the battery.
64 more elements
Dependencies are inferred from the claim text.