sof_trapezoid.h

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/**
 * @file    sof_trapezoid.h
 * @author  foxBMS Team
 * @date    2020-10-07 (date of creation)
 * @updated 2023-02-03 (date of last update)
 * @version v1.5.0
 * @ingroup APPLICATION
 * @prefix  SOF
 *
 * @brief   Header for SOX module, responsible for current derating calculation
 *
 */
 
#ifndef FOXBMS__SOF_TRAPEZOID_H_
#define FOXBMS__SOF_TRAPEZOID_H_
 
/*========== Includes =======================================================*/
#include "sof_trapezoid_cfg.h"
 
#include <math.h>
#include <stdint.h>
 
/*========== Macros and Definitions =========================================*/
/**
 * struct definition for 4 different values: in two current directions (charge,
 * discharge) for two use cases (peak and continuous)
 */
typedef struct {
    float_t continuousChargeCurrent_mA;    /*!< maximum current for continues charging */
    float_t peakChargeCurrent_mA;          /*!< maximum current for peak charging */
    float_t continuousDischargeCurrent_mA; /*!< maximum current for continues discharging */
    float_t peakDischargeCurrent_mA;       /*!< maximum current for peak discharging */
} SOF_CURRENT_LIMITS_s;
 
/**
 * struct definition for calculating the linear SOF curve. The SOF curve is
 * voltage, temperature and charge/discharge dependent.
 */
typedef struct {
    float_t slopeLowTemperatureDischarge;   /*!< low temperature dependent derating slope for discharge current */
    float_t offsetLowTemperatureDischarge;  /*!< discharge current offset for low temperature dependent derating */
    float_t slopeHighTemperatureDischarge;  /*!< high temperature dependent derating slope for discharge current */
    float_t offsetHighTemperatureDischarge; /*!< discharge current offset for high temperature dependent derating */
 
    float_t slopeLowTemperatureCharge;   /*!< low temperature dependent derating slope for charge current */
    float_t offsetLowTemperatureCharge;  /*!< charge current offset for low temperature dependent derating */
    float_t slopeHighTemperatureCharge;  /*!< high temperature dependent derating slope for charge current */
    float_t offsetHighTemperatureCharge; /*!< charge current offset for high temperature dependent derating */
 
    float_t slopeUpperCellVoltage;  /*!< upper cell voltage derating slope for charge and discharge current */
    float_t offsetUpperCellVoltage; /*!< charge/discharge current offset for upper voltage derating */
    float_t slopeLowerCellVoltage;  /*!< lower cell voltage derating slope for charge and discharge current */
    float_t offsetLowerCellVoltage; /*!< charge/discharge current offset for lower voltage derating */
} SOF_CURVE_s;
 
/*========== Extern Constant and Variable Declarations ======================*/
 
/*========== Extern Function Prototypes =====================================*/
/**
 * @brief   initializes the area for SOF (where derating starts and is fully
 *          active).
 * @details Pseudocode for linear function parameter extraction with 2 points:
 *          - slope = (y2 - y1) / (x2-x1)
 *          - offset = y1 - (slope) * x1
 *          - function y= slope * x + offset
 */
extern void SOF_Init(void);
 
/**
 * @brief   triggers SOF calculation
 * @details TODO
 */
extern void SOF_Calculation(void);
 
/*========== Externalized Static Functions Prototypes (Unit Test) ===========*/
#ifdef UNITY_UNIT_TEST
extern void TEST_SOF_CalculateVoltageBasedCurrentLimit(
    int16_t minimumCellVoltage_mV,
    int16_t maximumCellVoltage_mV,
    SOF_CURRENT_LIMITS_s *pAllowedVoltageBasedCurrent,
    const SOF_CONFIG_s *pConfigLimitValues,
    SOF_CURVE_s *pCalculatedSofCurves);
extern void TEST_SOF_CalculateTemperatureBasedCurrentLimit(
    int16_t minimumCellTemperature_ddegC,
    int16_t maximumCellTemperature_ddegC,
    SOF_CURRENT_LIMITS_s *pAllowedTemperatureBasedCurrent,
    const SOF_CONFIG_s *pConfigLimitValues,
    SOF_CURVE_s *pCalculatedSofCurves);
extern SOF_CURRENT_LIMITS_s TEST_SOF_MinimumOfTwoSofValues(
    SOF_CURRENT_LIMITS_s voltageBasedLimits,
    SOF_CURRENT_LIMITS_s temperatureBasedLimits);
#endif
#endif /* FOXBMS__SOF_TRAPEZOID_H_ */