Battery knowledge · State estimation
State of function
A yes-or-no, or graded, judgement of whether a battery can perform a specific task right now — crank an engine, deliver the next ten seconds of power — combining state of charge, state of health and temperature.
- Abbreviation
- SOF
Example
State estimation: an example situation
Current-sensor bias accumulates in coulomb counting. Exact model SOC does not establish real estimator accuracy.
Read State of function alongside State of charge in this context. How full a cell is, as a fraction of its available capacity. State of charge, like temperature, affects how fast a stored cell ages.
Use in Lemonergy
Distinguish internal states from noisy measurement estimates.
This is a reference concept. No executable Lemonergy block has been verified for this term.
References & further reading
Further reading on this topic
These sources provide broader context; they are not presented as citations for every statement in this entry.
- Extended Kalman filtering for battery management systems of LiPB-based HEV battery packs: Part 3. State and parameter estimation
Gregory L. Plett · Journal of Power Sources · 2004
Topic background · Model-based battery state-of-charge and parameter estimation with extended Kalman filtering, including uncertainty and model dependence.
- Extended Kalman filtering for battery management systems of LiPB-based HEV battery packs: Part 2. Modeling and identification
Gregory L. Plett · Journal of Power Sources · 2004
Topic background · Battery charge balance, open-circuit voltage, ohmic loss, polarization dynamics and model identification; parameters require cell-specific data.