Method and system for determining an operation condition of an energy storage device
AssigneeVolvo Car Corporation
InventorsHannes KUUSISTO, Bjorn FRIDHOLM
Life of this patent
Estimating the term…
Abstract
A method and a system are disclosed for determining a parameter map used for estimating an operation condition for an energy storage device which may be an energy storage device. The method includes updating the parameter map. When updating the parameter map, a correlation model is implemented taking into account aging behavior of the energy storage device. The model comprises correlation between different parts of the parameter map which enables updating the parameter map at parts which is presently not at a current operating point. Based on the parameter map, an operation condition of the energy storage device may be determined.
Claims15
A method for determining a parameter map used for estimating an operation condition for an energy storage device, the method comprising:
- determining a first parameter value related to the operation condition of the energy storage device and a variance of the first parameter value, the first parameter value being related to a current operating point of a parameter map comprising at least two operating points each having a related parameter value;
- for the current operating point, estimating an updated parameter value and an updated variance of the first parameter value;
- for at least a portion of operating points of the parameter map, estimating an updated parameter value and an updated variance of each of the parameter values using a correlation model including correlation between the parameter value at the current operating point and each of the parameter values at the operating points in the portion of operating points in the parameter map;
- and
- based on the updated parameter values and updated variances, updating the parameter map by replacing the parameter values with the updated parameter values and the variances with the updated variances at the respective operating point.
A system for estimating an operation condition for an energy storage device, the system comprising:
- a sensor for measuring a parameter value related to an operation condition of the energy storage device;
- and
- a control unit electrically connected to the sensor and configured to receive the parameter value from the sensor, the control unit further configured to
- determine a first parameter value related to the operation condition of the energy storage device and a variance of the first parameter value, the first parameter value being related to a current operating point of a parameter map comprising at least two operating points each having a related parameter value,
- for the current operating point, estimate an updated parameter value and an updated variance of the first parameter value using a recursive process,
- for a portion of operating points of the parameter map excluding the current operating point, estimate an updated parameter value and an updated variance of each of the parameter values using a correlation model including correlation between the parameter value at the current operating point and each of the parameter values at the operating points in the portion of operating points in the parameter map, and
- based on the updated parameter values and updated variances, update the parameter map by replacing the parameter values with the updated parameter values and the variances with the updated variances at the respective operating point.
Dependencies are inferred from the claim text.