rusefi/firmware/controllers/engine_cycle/high_pressure_fuel_pump.cpp

/*
 * @file high_pressure_fuel_pump.cpp
 * @brief High Pressure Fuel Pump controller for GDI applications
 *
 * TL,DR: we have constant displacement mechanical pump driven by camshaft
 * here we control desired fuel high pressure by controlling relief/strain/spill valve electronically
 *
 * @date Nov 6, 2021
 * @author Scott Smith, (c) 2021
 */

/*
 * This file is part of rusEfi - see http://rusefi.com
 *
 * rusEfi is free software; you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * rusEfi is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program.
 * If not, see <http://www.gnu.org/licenses/>.
 */

#include "pch.h"

#include "high_pressure_fuel_pump.h"
#include "spark_logic.h"
#include "fuel_computer.h"

#if EFI_HPFP

// A constant we use; doesn't seem important to hoist into engineConfiguration.
static constexpr int rpm_spinning_cutoff = 60; // Below this RPM, we don't run the logic

angle_t HpfpLobe::findNextLobe() {
	// TODO: Ideally we figure out where we are in the engine cycle and pick the next lobe
	// based on that.  At least we should do that when cranking, so we can start that much
	// sooner.

	auto lobes = engineConfiguration->hpfpCamLobes;
	if (!lobes) {
		return 0;
	}

	// Which lobe are we on?
	int next_index = m_lobe_index + 1;
	// Note, this will be insufficient if the # of cam lobes is
	// dynamically changed rapidly by more than 2x, but it will
	// correct itself rather quickly.
	if (next_index >= lobes) {
		next_index -= lobes;
	}
	m_lobe_index = next_index;

	// Calculate impact of VVT
	angle_t vvt = 0;
	if (engineConfiguration->hpfpCam != HPFP_CAM_NONE) {
		// TODO: Is the sign correct here?  + means ATDC?
		vvt = engine->triggerCentral.getVVTPosition(
			(engineConfiguration->hpfpCam - 1) / 2 & 1, // Bank
			(engineConfiguration->hpfpCam - 1) & 1);    // Cam
	}

	return engineConfiguration->hpfpPeakPos + vvt + next_index * 720 / lobes;
}

// As a percent of the full pump stroke
float HpfpQuantity::calcFuelPercent(int rpm) {
	float fuel_requested_cc_per_cycle =
		engine->engineState.injectionMass[0] * (1.f / fuelDensity) * engineConfiguration->cylindersCount;
	float fuel_requested_cc_per_lobe = fuel_requested_cc_per_cycle / engineConfiguration->hpfpCamLobes;
	return 100.f *
		fuel_requested_cc_per_lobe / engineConfiguration->hpfpPumpVolume +
		interpolate3d(engineConfiguration->hpfpCompensation,
			      engineConfiguration->hpfpCompensationLoadBins, fuel_requested_cc_per_lobe,
			      engineConfiguration->hpfpCompensationRpmBins, rpm);
}

static float getLoad() {
    switch(engineConfiguration->fuelAlgorithm) {
    // TODO: allow other load axis, like we claim to
    case LM_ALPHA_N:
        return Sensor::getOrZero(SensorType::DriverThrottleIntent);
    default:
       return Sensor::getOrZero(SensorType::Map);
    }
}

float HpfpQuantity::calcPI(int rpm, float calc_fuel_percent) {
	float load = getLoad();

	float possibleValue = m_pressureTarget_kPa - (engineConfiguration->hpfpTargetDecay *
			(FAST_CALLBACK_PERIOD_MS / 1000.));

	m_pressureTarget_kPa = std::max<float>(possibleValue,
		interpolate3d(engineConfiguration->hpfpTarget,
			      engineConfiguration->hpfpTargetLoadBins, load,
			      engineConfiguration->hpfpTargetRpmBins, rpm));

	auto fuelPressure = Sensor::get(SensorType::FuelPressureHigh);
	if (!fuelPressure) {
		return 0;
	}

	float pressureError_kPa =
		m_pressureTarget_kPa - fuelPressure.Value;

	float p_control_percent = pressureError_kPa * engineConfiguration->hpfpPidP;
	float i_factor_divisor =
		1000. * // ms/sec
		60. *   // sec/min -> ms/min
		2.;     // rev/cycle -> (rev * ms) / (min * cycle)
	float i_factor =
		engineConfiguration->hpfpPidI * // % / (kPa * lobe)
		rpm * // (% * revs) / (kPa * lobe * min)
		engineConfiguration->hpfpCamLobes * // lobes/cycle -> (% * revs) / (kPa * min * cycles)
		(FAST_CALLBACK_PERIOD_MS / // (% * revs * ms) / (kPa * min * cycles)
		 i_factor_divisor); // % / kPa
	float i_control_percent = m_I_sum_percent + pressureError_kPa * i_factor;
	// Clamp the output so that calc_fuel_percent+i_control_percent is within 0% to 100%
	// That way the I term can override any fuel calculations over the long term.
	// The P term is still allowed to drive the total output over 100% or under 0% to react to
	// short term errors.
	i_control_percent = clampF(-calc_fuel_percent, i_control_percent,
				   100.f - calc_fuel_percent);
	m_I_sum_percent = i_control_percent;
	return p_control_percent + i_control_percent;
}

angle_t HpfpQuantity::pumpAngleFuel(int rpm, HpfpController *model) {
	// Math based on fuel requested
	model->fuel_requested_percent = calcFuelPercent(rpm);

	model->fuel_requested_percent_pi = calcPI(rpm, model->fuel_requested_percent);
	// todo: streamline this logging field see 'calcPI' comment
	model->m_pressureTarget_kPa = m_pressureTarget_kPa;
	// Apply PI control
	float fuel_requested_percentTotal = model->fuel_requested_percent + model->fuel_requested_percent_pi;


	// Convert to degrees
	return interpolate2d(fuel_requested_percentTotal,
			     engineConfiguration->hpfpLobeProfileQuantityBins,
			     engineConfiguration->hpfpLobeProfileAngle);
}

void HpfpController::onFastCallback() {
	// Pressure current/target calculation
	int rpm = Sensor::getOrZero(SensorType::Rpm);

	isHpfpInactive = rpm < rpm_spinning_cutoff ||
		    engineConfiguration->hpfpCamLobes == 0 ||
		    engineConfiguration->hpfpPumpVolume == 0 ||
		    !enginePins.hpfpValve.isInitialized();
	// What conditions can we not handle?
	if (isHpfpInactive) {
		m_quantity.reset();
		m_requested_pump = 0;
		m_deadtime = 0;
	} else {
#if EFI_PROD_CODE && EFI_SHAFT_POSITION_INPUT
		efiAssertVoid(ObdCode::OBD_PCM_Processor_Fault, engine->triggerCentral.triggerShape.getSize() > engineConfiguration->hpfpCamLobes * 6, "Too few trigger tooth for this number of HPFP lobes");
#endif // EFI_PROD_CODE
		// Convert deadtime from ms to degrees based on current RPM
		float deadtime_ms = interpolate2d(
			Sensor::get(SensorType::BatteryVoltage).value_or(VBAT_FALLBACK_VALUE),
			engineConfiguration->hpfpDeadtimeVoltsBins,
			engineConfiguration->hpfpDeadtimeMS);
		m_deadtime = deadtime_ms * rpm * (360.f / 60.f / 1000.f);

		// We set deadtime first, then pump, in case pump used to be 0.  Pump is what
		// determines whether we do anything or not.
		m_requested_pump = m_quantity.pumpAngleFuel(rpm, this);

		if (!m_running) {
			m_running = true;
			scheduleNextCycle();
		}
	}
}

void HpfpController::pinTurnOn(HpfpController *self) {
	enginePins.hpfpValve.setHigh();

	// By scheduling the close after we already open, we don't have to worry if the engine
	// stops, the valve will be turned off in a certain amount of time regardless.
	scheduleByAngle(&self->m_event.scheduling,
			self->m_event.scheduling.momentX,
			self->m_deadtime + engineConfiguration->hpfpActivationAngle,
			{ pinTurnOff, self });
}

void HpfpController::pinTurnOff(HpfpController *self) {
	enginePins.hpfpValve.setLow();

	self->scheduleNextCycle();
}

void HpfpController::scheduleNextCycle() {
	noValve = !enginePins.hpfpValve.isInitialized();
	if (noValve) {
		m_running = false;
		return;
	}

	angle_t lobe = m_lobe.findNextLobe();
	angle_t angle_requested = m_requested_pump;

	angleAboveMin = angle_requested > engineConfiguration->hpfpMinAngle;
	if (angleAboveMin) {
		di_nextStart = lobe - angle_requested - m_deadtime;

		/**
		 * We are good to use just one m_event instance because new events are scheduled when we turn off valve.
		 */
		engine->module<TriggerScheduler>()->schedule(
			&m_event,
			di_nextStart,
			{ pinTurnOn, this });

		// Off will be scheduled after turning the valve on
	} else {
		// Schedule this, even if we aren't opening the valve this time, since this
		// will schedule the next lobe.
		// todo: would it have been cleaner to schedule 'scheduleNextCycle' directly?
		engine->module<TriggerScheduler>()->schedule(
			&m_event, lobe,
			{ pinTurnOff, this });
	}
}

#endif // EFI_HPFP