corrections.cpp File Reference

#include "globals.h"
#include "corrections.h"
#include "timers.h"
#include "maths.h"
#include "sensors.h"
#include "unit_testing.h"
#include "preprocessor.h"
#include "src/PID_v1/PID_v1.h"
#include "units.h"
#include "fuel_calcs.h"

Typedefs
using	aeTimeoutExpiredCallback_t = void(*)(void)
using	shouldResetCurrentAeCallback_t = bool(*)(void)
using	shouldStartAeCallback_t = bool(*)(void)
using	computAeCallback_t = uint16_t(*)(void)

Functions
void	initialiseCorrections (void)
TESTABLE_INLINE_STATIC uint8_t	correctionWUE (void)
static uint16_t	lookUpCrankingEnrichmentPct (void)
static uint16_t	computeCrankingTaperStartPct (uint16_t crankingPercent)
TESTABLE_INLINE_STATIC uint16_t	correctionCranking (void)
TESTABLE_INLINE_STATIC uint8_t	correctionASE (void)
static void	accelEnrichmentOff (void)
static bool	isAccelEnrichmentOn (void)
static uint8_t	applyAeRpmTaper (uint8_t accelCorrection)
static uint16_t	applyAeCoolantTaper (uint16_t accelCorrection)
static uint16_t	calcAccelEnrichment (const uint8_t accelCorrection)
static uint16_t	calcDeccelEnrichment (void)
static bool	aeTimeoutExpired (void)
static void	updateAeTimeout (void)
static uint16_t	correctionAccel (const aeTimeoutExpiredCallback_t onTimeoutExpired, const shouldResetCurrentAeCallback_t shouldResetCurrentAe, const shouldStartAeCallback_t shouldStartAe, const computAeCallback_t computeAe)
static void	mapOnTimeoutExpired (void)
static bool	mapShouldResetAe (void)
static bool	mapShouldStartAe (void)
static uint16_t	mapComputeAe (void)
static int16_t	computeMapDot (void)
static uint16_t	correctionAccelModeMap (void)
static void	tpsOnTimeoutExpired (void)
static bool	tpsShouldResetAe (void)
static bool	tpsShouldStartAe (void)
static uint16_t	tpsComputeAe (void)
static int16_t	computeTPSDOT (void)
static uint16_t	correctionAccelModeTps (void)
TESTABLE_INLINE_STATIC uint16_t	correctionAccel (void)
static bool	isFloodClearActive (const statuses &current, const config4 &page4)
TESTABLE_INLINE_STATIC uint8_t	correctionFloodClear (void)
TESTABLE_INLINE_STATIC byte	correctionBatVoltage (void)
TESTABLE_INLINE_STATIC uint8_t	correctionIATDensity (void)
TESTABLE_INLINE_STATIC uint8_t	correctionBaro (void)
TESTABLE_INLINE_STATIC uint8_t	correctionLaunch (void)
TESTABLE_INLINE_STATIC uint8_t	correctionDFCOfuel (void)
TESTABLE_INLINE_STATIC bool	correctionDFCO (void)
TESTABLE_INLINE_STATIC uint8_t	correctionFlex (void)
TESTABLE_INLINE_STATIC uint8_t	correctionFuelTemp (void)
uint8_t	calculateAfrTarget (table3d16RpmLoad &afrLookUpTable, const statuses &current, const config2 &page2, const config6 &page6)
static uint8_t	computeSimpleLeanCorrection (const statuses &current, const config6 &page6)
static uint8_t	computeSimpleRichCorrection (const statuses &current, const config6 &page6)
static uint8_t	computeSimpleCorrection (const statuses &current, const config6 &page6)
static uint8_t	computePIDCorrection (const statuses &current, const config6 &page6)
static bool	nextAfrCycleHasStarted (void)
static void	setNextAfrCycle (void)
static bool	isAfrClosedLoopOperational (const statuses &current, const config6 &page6, const config9 &page9)
static bool	isValidEgoAlgorithm (const config6 &page6)
static bool	isAfrCorrectionEnabled (const statuses &current, const config6 &page6)
static uint8_t	computeAFRCorrection (const statuses &current, const config6 &page6)
TESTABLE_INLINE_STATIC uint8_t	correctionAFRClosedLoop (void)
static uint32_t	combineCorrections (uint32_t sumCorrections, uint16_t correction)
uint16_t	correctionsFuel (void)
int8_t	correctionFixedTiming (int8_t advance)
TESTABLE_INLINE_STATIC int8_t	correctionCLTadvance (int8_t advance)
int8_t	correctionCrankingFixedTiming (int8_t advance)
TESTABLE_INLINE_STATIC int8_t	correctionFlexTiming (int8_t advance)
static bool	isWMIAdvanceEnabled (void)
static bool	isWMIAdvanceOperational (void)
TESTABLE_INLINE_STATIC int8_t	correctionWMITiming (int8_t advance)
TESTABLE_INLINE_STATIC int8_t	correctionIATretard (int8_t advance)
static uint8_t	computeIdleAdvanceRpmDelta (void)
static int8_t	applyIdleAdvanceAdjust (int8_t advance, int8_t adjustment)
static bool	isIdleAdvanceOn (void)
static bool	isIdleAdvanceOperational (void)
TESTABLE_INLINE_STATIC int8_t	correctionIdleAdvance (int8_t advance)
static int8_t	calculateSoftRevLimitAdvance (int8_t advance)
TESTABLE_INLINE_STATIC int8_t	correctionSoftRevLimit (int8_t advance)
TESTABLE_INLINE_STATIC int8_t	correctionNitrous (int8_t advance)
TESTABLE_INLINE_STATIC int8_t	correctionSoftLaunch (int8_t advance)
TESTABLE_INLINE_STATIC int8_t	correctionSoftFlatShift (int8_t advance)
static uint8_t	_calculateKnockRecovery (uint8_t curKnockRetard)
static int8_t	correctionKnockTiming (int8_t advance)
TESTABLE_INLINE_STATIC int8_t	correctionDFCOignition (int8_t advance)
static uint8_t	getPulsesPerRev (void)
TESTABLE_INLINE_STATIC uint16_t	correctDwellClosedLoop (uint16_t computedDwell, uint16_t actualDwell)
	Dwell error correction is a basic closed loop correction to keep the dwell time consistent even when adjusting its end time for the per tooth timing.
uint16_t	correctionsDwell (uint16_t dwell)
int8_t	correctionsIgn (int8_t base_advance)

Variables
static long	PID_O2
static long	PID_output
static long	PID_AFRTarget
static uint16_t	aeActivatedReading
TESTABLE_STATIC uint16_t	AFRnextCycle
static unsigned long	knockStartTime
static uint8_t	knockLastRecoveryStep
static uint8_t	dfcoTaper
TESTABLE_STATIC table2D_u8_u8_4 taeTable &	configPage4
TESTABLE_STATIC table2D_u8_u8_4 ASETable &	configPage2
TESTABLE_STATIC table2D_u8_u8_4 crankingEnrichTable &	configPage10
TESTABLE_STATIC table2D_u8_u8_6 dwellVCorrectionTable &	configPage6
static constexpr uint8_t	NO_FUEL_CORRECTION = ONE_HUNDRED_PCT
static constexpr uint8_t	BASELINE_FUEL_CORRECTION = ONE_HUNDRED_PCT
static constexpr uint16_t	IGN_IDLE_THRESHOLD = 200U

Detailed Description

Corrections to injection pulsewidth. The corrections functions in this file affect the fuel pulsewidth (Either increasing or decreasing) based on factors other than the VE lookup.

These factors include:

• Temperature (Warmup Enrichment and After Start Enrichment)
• Acceleration/Deceleration
• Flood clear mode
• etc.

Most correction functions return value 100 (like 100% == 1) for no need for correction.

There are 2 top level functions that call more detailed corrections for Fuel and Ignition respectively:

• correctionsFuel() - All fuel related corrections
• correctionsIgn() - All ignition related corrections

Typedef Documentation

aeTimeoutExpiredCallback_t

using aeTimeoutExpiredCallback_t = void (*)(void)

computAeCallback_t

using computAeCallback_t = uint16_t (*)(void)

shouldResetCurrentAeCallback_t

using shouldResetCurrentAeCallback_t = bool (*)(void)

shouldStartAeCallback_t

using shouldStartAeCallback_t = bool (*)(void)

Function Documentation

_calculateKnockRecovery()

static uint8_t _calculateKnockRecovery ( uint8_t  curKnockRetard )

inlinestatic

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accelEnrichmentOff()

static void accelEnrichmentOff ( void  )

inlinestatic

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aeTimeoutExpired()

static bool aeTimeoutExpired ( void  )

inlinestatic

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applyAeCoolantTaper()

static uint16_t applyAeCoolantTaper ( uint16_t  accelCorrection )

inlinestatic

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applyAeRpmTaper()

static uint8_t applyAeRpmTaper ( uint8_t  accelCorrection )

inlinestatic

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applyIdleAdvanceAdjust()

static int8_t applyIdleAdvanceAdjust ( int8_t  advance, int8_t  adjustment  )

inlinestatic

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calcAccelEnrichment()

static uint16_t calcAccelEnrichment ( const uint8_t  accelCorrection )

inlinestatic

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calcDeccelEnrichment()

static uint16_t calcDeccelEnrichment ( void  )

inlinestatic

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calculateAfrTarget()

uint8_t calculateAfrTarget	(	table3d16RpmLoad &	afrLookUpTable,
		const statuses &	current,
		const config2 &	page2,
		const config6 &	page6
	)

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calculateSoftRevLimitAdvance()

static int8_t calculateSoftRevLimitAdvance ( int8_t  advance )

inlinestatic

Ignition soft revlimit correction.

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combineCorrections()

static uint32_t combineCorrections ( uint32_t  sumCorrections, uint16_t  correction  )

inlinestatic

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computeAFRCorrection()

static uint8_t computeAFRCorrection ( const statuses &  current, const config6 &  page6  )

inlinestatic

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computeCrankingTaperStartPct()

static uint16_t computeCrankingTaperStartPct ( uint16_t  crankingPercent )

inlinestatic

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computeIdleAdvanceRpmDelta()

static uint8_t computeIdleAdvanceRpmDelta ( void  )

inlinestatic

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computeMapDot()

static int16_t computeMapDot ( void  )

inlinestatic

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computePIDCorrection()

static uint8_t computePIDCorrection ( const statuses &  current, const config6 &  page6  )

inlinestatic

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computeSimpleCorrection()

static uint8_t computeSimpleCorrection ( const statuses &  current, const config6 &  page6  )

inlinestatic

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computeSimpleLeanCorrection()

static uint8_t computeSimpleLeanCorrection ( const statuses &  current, const config6 &  page6  )

inlinestatic

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computeSimpleRichCorrection()

static uint8_t computeSimpleRichCorrection ( const statuses &  current, const config6 &  page6  )

inlinestatic

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computeTPSDOT()

static int16_t computeTPSDOT ( void  )

inlinestatic

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correctDwellClosedLoop()

TESTABLE_INLINE_STATIC uint16_t correctDwellClosedLoop	(	uint16_t	computedDwell,
		uint16_t	actualDwell
	)

Dwell error correction is a basic closed loop correction to keep the dwell time consistent even when adjusting its end time for the per tooth timing.

This is mostly of benefit to low resolution triggers at low rpm (<1500)

Parameters

computedDwell	A computed dwell time in microseconds
actualDwell	The most recently measured actual dwell time in microseconds

Returns

computedDwell, with correction applied if needed

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correctionAccel() [1/2]

static uint16_t correctionAccel ( const aeTimeoutExpiredCallback_t  onTimeoutExpired, const shouldResetCurrentAeCallback_t  shouldResetCurrentAe, const shouldStartAeCallback_t  shouldStartAe, const computAeCallback_t  computeAe  )

inlinestatic

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correctionAccel() [2/2]

TESTABLE_INLINE_STATIC uint16_t correctionAccel

(

void

)

Acceleration enrichment correction calculation.

Calculates the % change of the throttle over time (%/second) and performs a lookup based on this Coolant-based modifier is applied on the top of this. When the enrichment is turned on, it runs at that amount for a fixed period of time (taeTime)

Returns

uint16_t The Acceleration enrichment modifier as a %. 100% = No modification.

As the maximum enrichment amount is +255% and maximum cold adjustment for this is 255%, the overall return value from this function can be 100+(255*255/100)=750. Hence this function returns a uint16_t rather than uint8_t.

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correctionAccelModeMap()

static uint16_t correctionAccelModeMap ( void  )

inlinestatic

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correctionAccelModeTps()

static uint16_t correctionAccelModeTps ( void  )

inlinestatic

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correctionAFRClosedLoop()

TESTABLE_INLINE_STATIC uint8_t correctionAFRClosedLoop

(

void

)

Lookup the AFR target table and perform either a simple or PID adjustment based on this.

Simple (Best suited to narrowband sensors): If the O2 sensor reports that the mixture is lean/rich compared to the desired AFR target, it will make a 1% adjustment It then waits egoDelta number of ignition events and compares O2 against the target table again. If it is still lean/rich then the adjustment is increased to 2%.

This continues until either:

• the O2 reading flips from lean to rich, at which point the adjustment cycle starts again at 1% or
• the adjustment amount increases to egoLimit at which point it stays at this level until the O2 state (rich/lean) changes

PID (Best suited to wideband sensors):

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correctionASE()

TESTABLE_INLINE_STATIC uint8_t correctionASE

(

void

)

After Start Enrichment calculation. This is a short period (Usually <20 seconds) immediately after the engine first fires (But not when cranking) where an additional amount of fuel is added (Over and above the WUE amount).

Returns

uint8_t The After Start Enrichment modifier as a %. 100% = No modification.

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correctionBaro()

TESTABLE_INLINE_STATIC uint8_t correctionBaro

(

void

)

Correction for current barometric / ambient pressure.

Returns

A percentage value indicating the amount the fuelling should be changed based on the barometric reading. 100 = No change. 110 = 10% increase. 90 = 10% decrease

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correctionBatVoltage()

TESTABLE_INLINE_STATIC byte correctionBatVoltage

(

void

)

Battery Voltage correction. Uses a 2D enrichment table (WUETable) where the X axis is engine temp and the Y axis is the amount of extra fuel to add.

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correctionCLTadvance()

TESTABLE_INLINE_STATIC int8_t correctionCLTadvance

(

int8_t

advance

)

Ignition correction for coolant temperature (CLT).

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correctionCranking()

TESTABLE_INLINE_STATIC uint16_t correctionCranking

(

void

)

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correctionCrankingFixedTiming()

int8_t correctionCrankingFixedTiming

(

int8_t

advance

)

Correct ignition timing to configured fixed value to use during craning. Must be called near end to override all other corrections.

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correctionDFCO()

TESTABLE_INLINE_STATIC bool correctionDFCO

(

void

)

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correctionDFCOfuel()

TESTABLE_INLINE_STATIC uint8_t correctionDFCOfuel

(

void

)

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correctionDFCOignition()

TESTABLE_INLINE_STATIC int8_t correctionDFCOignition

(

int8_t

advance

)

Ignition DFCO taper correction.

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correctionFixedTiming()

int8_t correctionFixedTiming

(

int8_t

advance

)

Correct ignition timing to configured fixed value. Must be called near end to override all other corrections.

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correctionFlex()

TESTABLE_INLINE_STATIC uint8_t correctionFlex

(

void

)

Flex fuel adjustment to vary fuel based on ethanol content. The amount of extra fuel required is a linear relationship based on the % of ethanol.

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correctionFlexTiming()

TESTABLE_INLINE_STATIC int8_t correctionFlexTiming

(

int8_t

advance

)

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correctionFloodClear()

TESTABLE_INLINE_STATIC uint8_t correctionFloodClear

(

void

)

Simple check to see whether we are cranking with the TPS above the flood clear threshold.

Returns

100 (not cranking and thus no need for flood-clear) or 0 (Engine cranking and TPS above config4::floodClear limit).

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correctionFuelTemp()

TESTABLE_INLINE_STATIC uint8_t correctionFuelTemp

(

void

)

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correctionIATDensity()

TESTABLE_INLINE_STATIC uint8_t correctionIATDensity

(

void

)

Simple temperature based corrections lookup based on the inlet air temperature (IAT). This corrects for changes in air density from movement of the temperature.

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correctionIATretard()

TESTABLE_INLINE_STATIC int8_t correctionIATretard

(

int8_t

advance

)

Ignition correction for inlet air temperature (IAT).

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correctionIdleAdvance()

TESTABLE_INLINE_STATIC int8_t correctionIdleAdvance

(

int8_t

advance

)

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correctionKnockTiming()

static int8_t correctionKnockTiming ( int8_t  advance )

inlinestatic

Ignition knock (retard) correction.

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correctionLaunch()

TESTABLE_INLINE_STATIC uint8_t correctionLaunch

(

void

)

Launch control has a setting to increase the fuel load to assist in bringing up boost. This simple check applies the extra fuel if we're currently launching

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correctionNitrous()

TESTABLE_INLINE_STATIC int8_t correctionNitrous

(

int8_t

advance

)

Ignition Nitrous oxide correction.

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correctionsDwell()

uint16_t correctionsDwell

(

uint16_t

dwell

)

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correctionsFuel()

uint16_t correctionsFuel

(

void

)

Dispatch calculations for all fuel related corrections. Calls all the other corrections functions and combines their results. This is the only function that should be called from anywhere outside the file

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correctionsIgn()

int8_t correctionsIgn

(

int8_t

base_advance

)

Dispatch calculations for all ignition related corrections.

Parameters

base_advance

- Base ignition advance (deg. ?)

Returns

Advance considering all (~12) individual corrections

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correctionSoftFlatShift()

TESTABLE_INLINE_STATIC int8_t correctionSoftFlatShift

(

int8_t

advance

)

Ignition correction for soft flat shift.

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correctionSoftLaunch()

TESTABLE_INLINE_STATIC int8_t correctionSoftLaunch

(

int8_t

advance

)

Ignition soft launch correction.

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correctionSoftRevLimit()

TESTABLE_INLINE_STATIC int8_t correctionSoftRevLimit

(

int8_t

advance

)

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correctionWMITiming()

TESTABLE_INLINE_STATIC int8_t correctionWMITiming

(

int8_t

advance

)

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correctionWUE()

TESTABLE_INLINE_STATIC uint8_t correctionWUE

(

void

)

Warm Up Enrichment (WUE) corrections. Uses a 2D enrichment table (WUETable) where the X axis is engine temp and the Y axis is the amount of extra fuel to add

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getPulsesPerRev()

static uint8_t getPulsesPerRev ( void  )

inlinestatic

Ignition Dwell Correction.

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initialiseCorrections()

void initialiseCorrections

(

void

)

Initialise instances and vars related to corrections (at ECU boot-up).

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isAccelEnrichmentOn()

static bool isAccelEnrichmentOn ( void  )

inlinestatic

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isAfrClosedLoopOperational()

static bool isAfrClosedLoopOperational ( const statuses &  current, const config6 &  page6, const config9 &  page9  )

inlinestatic

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isAfrCorrectionEnabled()

static bool isAfrCorrectionEnabled ( const statuses &  current, const config6 &  page6  )

inlinestatic

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isFloodClearActive()

static bool isFloodClearActive ( const statuses &  current, const config4 &  page4  )

inlinestatic

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isIdleAdvanceOn()

static bool isIdleAdvanceOn ( void  )

inlinestatic

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isIdleAdvanceOperational()

static bool isIdleAdvanceOperational ( void  )

inlinestatic

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isValidEgoAlgorithm()

static bool isValidEgoAlgorithm ( const config6 &  page6 )

inlinestatic

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isWMIAdvanceEnabled()

static bool isWMIAdvanceEnabled ( void  )

inlinestatic

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isWMIAdvanceOperational()

static bool isWMIAdvanceOperational ( void  )

inlinestatic

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lookUpCrankingEnrichmentPct()

static uint16_t lookUpCrankingEnrichmentPct ( void  )

inlinestatic

Cranking Enrichment corrections. Additional fuel % to be added when the engine is cranking

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mapComputeAe()

static uint16_t mapComputeAe ( void  )

inlinestatic

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mapOnTimeoutExpired()

static void mapOnTimeoutExpired ( void  )

inlinestatic

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mapShouldResetAe()

static bool mapShouldResetAe ( void  )

inlinestatic

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mapShouldStartAe()

static bool mapShouldStartAe ( void  )

inlinestatic

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nextAfrCycleHasStarted()

static bool nextAfrCycleHasStarted ( void  )

inlinestatic

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setNextAfrCycle()

static void setNextAfrCycle ( void  )

inlinestatic

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tpsComputeAe()

static uint16_t tpsComputeAe ( void  )

inlinestatic

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tpsOnTimeoutExpired()

static void tpsOnTimeoutExpired ( void  )

inlinestatic

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tpsShouldResetAe()

static bool tpsShouldResetAe ( void  )

inlinestatic

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tpsShouldStartAe()

static bool tpsShouldStartAe ( void  )

inlinestatic

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updateAeTimeout()

static void updateAeTimeout ( void  )

inlinestatic

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Variable Documentation

aeActivatedReading

uint16_t aeActivatedReading

static

AFRnextCycle

TESTABLE_STATIC uint16_t AFRnextCycle

BASELINE_FUEL_CORRECTION

constexpr uint8_t BASELINE_FUEL_CORRECTION = ONE_HUNDRED_PCT

staticconstexpr

configPage10

TESTABLE_STATIC table2D_u8_u8_6 wmiAdvTable & configPage10

configPage2

TESTABLE_STATIC table2D_u8_u8_4 ASECountTable & configPage2

configPage4

TESTABLE_STATIC table2D_u8_u8_6 CLTAdvanceTable & configPage4

configPage6

static table2D_u8_u8_4 iacCrankDutyTable & configPage6

dfcoTaper

uint8_t dfcoTaper

static

IGN_IDLE_THRESHOLD

constexpr uint16_t IGN_IDLE_THRESHOLD = 200U

staticconstexpr

Ignition Idle advance correction.

knockLastRecoveryStep

uint8_t knockLastRecoveryStep

static

knockStartTime

unsigned long knockStartTime

static

NO_FUEL_CORRECTION

constexpr uint8_t NO_FUEL_CORRECTION = ONE_HUNDRED_PCT

staticconstexpr

PID_AFRTarget

long PID_AFRTarget

static

PID_O2

static PID egoPID & PID_O2

static

Instance of the PID object in case that algorithm is used (Always instantiated). Needs to be global as it maintains state outside of each function call. Comes from Arduino (?) PID library.

PID_output

long PID_output

static