fome-fw/firmware/controllers/sensors/map.cpp

/**
 * @file map.cpp
 *
 * See also map_averaging.cpp
 *
 * @author Andrey Belomutskiy, (c) 2012-2020
 */
#include "pch.h"

#if EFI_PROD_CODE
#include "digital_input_icu.h"
#include "digital_input_exti.h"
#endif

#if EFI_ANALOG_SENSORS

static FastInterpolation customMap;

// See 'useFixedBaroCorrFromMap'
static float storedInitialBaroPressure = NAN;

/**
 * @brief	MAP value decoded for a 1.83 Honda sensor
 * -6.64kPa at zero volts
 * 182.78kPa at 5 volts
 *
 * about 3 volts at 100kPa
 *
 * @returns kPa value
 */
static FastInterpolation denso183(0, -6.64, 5, 182.78);

/**
 * MAP sensor output voltage of 3.0v = a gauge reading of 0 in. Hg
 * MAP sensor output voltage of 0.5v = a gauge reading of 27 in. Hg
 */
static FastInterpolation honda3bar(0.5, 91.422, 3.0, 0);

static FastInterpolation subyDenso(0, 0, 5, 200);

static FastInterpolation gm3bar(0.631, 40, 4.914, 304);

static FastInterpolation gm2bar(0, 8.8, 5, 208);

static FastInterpolation gm1bar(0, 10, 5, 105);

static FastInterpolation mpx4250(0, 8, 5, 260);

static FastInterpolation mpx4250A(0.25, 20, 4.875, 250);

static FastInterpolation mpxh6400(1 /*volts*/, 90 /*kPa*/, 3 /*volts*/, 250 /*kPa*/);

static FastInterpolation mpx4100(0.3, 20, 4.9, 105);

/**
 * http://easyautodiagnostics.com/chrysler/2.0L-2.4L/map-sensor-diagnostic-test-1
 * or maybe
 * https://books.google.com/books?id=3q85p56_PxIC page 132
 * https://books.google.com/books?id=3q85p56_PxIC&q=chrysler+map#v=snippet&q=chrysler%20map&f=false
 */
//static FastInterpolation dodgeNeon2003(0.5 /* volts */, 0 /* kPa */, 4.5 /* volts */ , 100 /* kPa */);
static FastInterpolation dodgeNeon2003(0.4 /* volts */, 15.34 /* kPa */, 4.5 /* volts */ , 100 /* kPa */);

static FastInterpolation densoToyota(3.7 - 2 /* volts */, 33.322271 /* kPa */, 3.7 /* volts */ , 100 /* kPa */);

/**
 * Open question how to get this Miata NB2 sensor read MAP
 */
static FastInterpolation mazda1bar(0 /* volts */, 2.5 /* kPa */, 5 /* volts */ , 117 /* kPa */);

/**
 * Bosch 2.5 Bar TMap Map Sensor with IAT
 */
static FastInterpolation bosch2_5(0.4 /* volts */, 20 /* kPa */, 4.65 /* volts */ , 250 /* kPa */);

static FastInterpolation *getDecoder(air_pressure_sensor_type_e type);

float decodePressure(float voltage, air_pressure_sensor_config_s * mapConfig) {
	switch (mapConfig->type) {
	case MT_CUSTOM:
		// todo: migrate to 'FastInterpolation customMap'
		return interpolateMsg("map", engineConfiguration->mapLowValueVoltage, mapConfig->lowValue,
				engineConfiguration->mapHighValueVoltage, mapConfig->highValue, voltage);
	case MT_DENSO183:
	case MT_MPX4250:
	case MT_MPX4250A:
	case MT_HONDA3BAR:
	case MT_DODGE_NEON_2003:
	case MT_SUBY_DENSO:
	case MT_GM_3_BAR:
	case MT_GM_2_BAR:
	case MT_GM_1_BAR:
	case MT_TOYOTA_89420_02010:
	case MT_MPX4100:
	case MT_BOSCH_2_5:
	case MT_MAZDA_1_BAR:
	case MT_MPXH6400:
		return getDecoder(mapConfig->type)->getValue(voltage);
	default:
		firmwareError(CUSTOM_ERR_MAP_TYPE, "Unknown MAP type: pressure %d", mapConfig->type);
		return NAN;
	}
}

/**
 * This function checks if Baro/MAP sensor value is inside of expected range
 * @return unchanged mapKPa parameter or NaN
 */
static float validateBaroMap(float mapKPa) {
	const float atmoPressure = 100.0f;
	const float atmoPressureRange = 15.0f;	// 85..115
	if (cisnan(mapKPa) || absF(mapKPa - atmoPressure) > atmoPressureRange) {
		warning(OBD_Barometric_Press_Circ, "Invalid start-up baro pressure = %.2fkPa", mapKPa);
		return NAN;
	}
	return mapKPa;
}

float getBaroPressure() {
	// Override the real Baro sensor with the stored initial MAP value, if the option is set.
	if (engineConfiguration->useFixedBaroCorrFromMap)
		return storedInitialBaroPressure;
	float voltage = getVoltageDivided("baro", engineConfiguration->baroSensor.hwChannel);
	return decodePressure(voltage, &engineConfiguration->baroSensor);
}

static FastInterpolation *getDecoder(air_pressure_sensor_type_e type) {
	switch (type) {
	case MT_DENSO183:
		return &denso183;
	case MT_MPX4250:
		return &mpx4250;
	case MT_MPX4100:
		return &mpx4100;
	case MT_MPX4250A:
		return &mpx4250A;
	case MT_MPXH6400:
		return &mpxh6400;
	case MT_HONDA3BAR:
		return &honda3bar;
	case MT_DODGE_NEON_2003:
		return &dodgeNeon2003;
	case MT_SUBY_DENSO:
		return &subyDenso;
	case MT_GM_3_BAR:
		return &gm3bar;
	case MT_GM_2_BAR:
		return &gm2bar;
	case MT_GM_1_BAR:
		return &gm1bar;
	case MT_TOYOTA_89420_02010:
		return &densoToyota;
	case MT_MAZDA_1_BAR:
		return &mazda1bar;
	case MT_BOSCH_2_5:
		return &bosch2_5;
	default:
		firmwareError(CUSTOM_ERR_MAP_TYPE, "Unknown MAP type: decoder %d", type);
		return &customMap;
	}
}

static void applyConfiguration() {
	air_pressure_sensor_config_s * apConfig = &engineConfiguration->map.sensor;
	customMap.init(0, apConfig->lowValue, 5, apConfig->highValue);
}

#if EFI_PROD_CODE

extern int mapMinBufferLength;

static void printMAPInfo() {
#if EFI_ANALOG_SENSORS
	efiPrintf("instant value=%.2fkPa", Sensor::getOrZero(SensorType::Map));

#if EFI_MAP_AVERAGING
	efiPrintf("map type=%d/%s MAP=%.2fkPa mapMinBufferLength=%d", engineConfiguration->map.sensor.type,
			getAir_pressure_sensor_type_e(engineConfiguration->map.sensor.type),
			Sensor::getOrZero(SensorType::Map),
			mapMinBufferLength);
#endif // EFI_MAP_AVERAGING

	adc_channel_e mapAdc = engineConfiguration->map.sensor.hwChannel;
	char pinNameBuffer[16];

	efiPrintf("MAP %.2fv @%s", getVoltage("mapinfo", mapAdc),
			getPinNameByAdcChannel("map", mapAdc, pinNameBuffer));
	if (engineConfiguration->map.sensor.type == MT_CUSTOM) {
		efiPrintf("at %.2fv=%.2f at %.2fv=%.2f",
				engineConfiguration->mapLowValueVoltage,
				engineConfiguration->map.sensor.lowValue,
				engineConfiguration->mapHighValueVoltage,
				engineConfiguration->map.sensor.highValue);
	}

	if (Sensor::hasSensor(SensorType::BarometricPressure)) {
		efiPrintf("baro type=%d value=%.2f", engineConfiguration->baroSensor.type, Sensor::get(SensorType::BarometricPressure).value_or(-1));
		if (engineConfiguration->baroSensor.type == MT_CUSTOM) {
			efiPrintf("min=%.2f@%.2f max=%.2f@%.2f",
					engineConfiguration->baroSensor.lowValue,
					engineConfiguration->mapLowValueVoltage,
					engineConfiguration->baroSensor.highValue,
					engineConfiguration->mapHighValueVoltage);
		}
	}
#endif /* EFI_ANALOG_SENSORS */
}
#endif /* EFI_PROD_CODE */


void initMapDecoder() {
	applyConfiguration();

	if (engineConfiguration->useFixedBaroCorrFromMap) {
		// Read initial MAP sensor value and store it for Baro correction.
		storedInitialBaroPressure = Sensor::get(SensorType::MapSlow).value_or(101.325);
		efiPrintf("Get initial baro MAP pressure = %.2fkPa", storedInitialBaroPressure);
		// validate if it's within a reasonable range (the engine should not be spinning etc.)
		storedInitialBaroPressure = validateBaroMap(storedInitialBaroPressure);
		if (!cisnan(storedInitialBaroPressure)) {
			efiPrintf("Using this fixed MAP pressure to override the baro correction!");
		} else {
			efiPrintf("The baro pressure is invalid. The fixed baro correction will be disabled!");
		}
	}
	
#if EFI_PROD_CODE
	addConsoleAction("mapinfo", printMAPInfo);
#endif
}

#else /* EFI_ANALOG_SENSORS */

void initMapDecoder() {
}

#endif /* EFI_ANALOG_SENSORS */