crankMaths.h File Reference

#include "maths.h"
#include "globals.h"

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Macros
#define	MICROS_PER_DEG_1_RPM   INT32_C(166667)
	At 1 RPM, each degree of angular rotation takes this many microseconds.
#define	MAX_RPM   INT16_C(18000)
	The maximum rpm that the ECU will attempt to run at.
#define	MIN_RPM   ((MICROS_PER_DEG_1_RPM/(UINT16_MAX/16UL))+1UL)
	Absolute minimum RPM that the crank math (& therefore all of Speeduino) can be used with.

Functions
static int16_t	ignitionLimits (int16_t angle)
	Makes one pass at nudging the angle to within [0,CRANK_ANGLE_MAX_IGN].
static int16_t	injectorLimits (int16_t angle)
	Makes one pass at nudging the angle to within [0,CRANK_ANGLE_MAX_INJ].
void	setAngleConverterRevolutionTime (uint32_t revolutionTime)
	Set the revolution time, from which some of the degree<-->angle conversions are derived.
Converts angular degrees to the time interval that amount of rotation
will take at current RPM. Based on angle of [0,720] and min/max RPM, result ranges from 9 (MAX_RPM, 1 deg) to 2926828 (MIN_RPM, 720 deg) Parameters angle Angle in degrees Returns Time interval in uS
uint32_t	angleToTimeMicroSecPerDegree (uint16_t angle)
Converts a time interval in microsecods to the equivalent degrees of angular (crank)
rotation at current RPM. Inverse of angleToTimeMicroSecPerDegree Parameters time Time interval in uS Returns Angle in degrees
uint16_t	timeToAngleDegPerMicroSec (uint32_t time)

Macro Definition Documentation

MAX_RPM

#define MAX_RPM   INT16_C(18000)

The maximum rpm that the ECU will attempt to run at.

It is NOT related to the rev limiter, but is instead dictates how fast certain operations will be allowed to run. Lower number gives better performance

MICROS_PER_DEG_1_RPM

#define MICROS_PER_DEG_1_RPM   INT32_C(166667)

At 1 RPM, each degree of angular rotation takes this many microseconds.

MIN_RPM

#define MIN_RPM   ((MICROS_PER_DEG_1_RPM/(UINT16_MAX/16UL))+1UL)

Absolute minimum RPM that the crank math (& therefore all of Speeduino) can be used with.

This is dictated by the use of uint16_t as the base type for storing angle<->time conversion factor (degreesPerMicro)

Function Documentation

angleToTimeMicroSecPerDegree()

uint32_t angleToTimeMicroSecPerDegree

(

uint16_t

angle

)

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ignitionLimits()

static int16_t ignitionLimits ( int16_t  angle )

inlinestatic

Makes one pass at nudging the angle to within [0,CRANK_ANGLE_MAX_IGN].

Parameters

angle

A crank angle in degrees

Returns

int16_t

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injectorLimits()

static int16_t injectorLimits ( int16_t  angle )

inlinestatic

Makes one pass at nudging the angle to within [0,CRANK_ANGLE_MAX_INJ].

Parameters

angle

A crank angle in degrees

Returns

int16_t

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setAngleConverterRevolutionTime()

void setAngleConverterRevolutionTime

(

uint32_t

revolutionTime

)

Set the revolution time, from which some of the degree<-->angle conversions are derived.

Parameters

revolutionTime

The crank revolution time.

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timeToAngleDegPerMicroSec()

uint16_t timeToAngleDegPerMicroSec

(

uint32_t

time

)

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