fuel_calcs.h File Reference

#include <stdint.h>

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Functions
uint16_t	PW (int REQ_FUEL, uint8_t VE, long MAP, uint16_t corrections, int injOpen)
	This function calculates the required pulsewidth time (in us) given the current system state.
uint16_t	calculatePWLimit ()
void	calculateStaging (uint32_t)

Variables
uint16_t	req_fuel_uS
uint16_t	inj_opentime_uS
Staging
These values are a percentage of the total (Combined) req_fuel value that would be required for each injector channel to deliver that much fuel. Eg: Pri injectors are 250cc Sec injectors are 500cc Total injector capacity = 750cc staged_req_fuel_mult_pri = 300% (The primary injectors would have to run 3x the overall PW in order to be the equivalent of the full 750cc capacity staged_req_fuel_mult_sec = 150% (The secondary injectors would have to run 1.5x the overall PW in order to be the equivalent of the full 750cc capacity
uint16_t	staged_req_fuel_mult_pri
uint16_t	staged_req_fuel_mult_sec

Function Documentation

calculatePWLimit()

uint16_t calculatePWLimit

(

)

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calculateStaging()

void calculateStaging

(

uint32_t

pwLimit

)

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PW()

uint16_t PW	(	int	REQ_FUEL,
		uint8_t	VE,
		long	MAP,
		uint16_t	corrections,
		int	injOpen
	)

This function calculates the required pulsewidth time (in us) given the current system state.

Parameters

REQ_FUEL	The required fuel value in uS, as calculated by TunerStudio
VE	Lookup from the main fuel table. This can either have been MAP or TPS based, depending on the algorithm used
MAP	In KPa, read from the sensor (This is used when performing a multiply of the map only. It is applicable in both Speed density and Alpha-N)
corrections	Sum of Enrichment factors (Cold start, acceleration). This is a multiplication factor (Eg to add 10%, this should be 110)
injOpen	Injector opening time. The time the injector take to open minus the time it takes to close (Both in uS)

Returns

uint16_t The injector pulse width in uS

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Variable Documentation

inj_opentime_uS

uint16_t inj_opentime_uS

extern

The injector opening time. This is set within Tuner Studio, but stored here in uS rather than mS

req_fuel_uS

uint16_t req_fuel_uS

extern

The required fuel variable (As calculated by TunerStudio) in uS

staged_req_fuel_mult_pri

uint16_t staged_req_fuel_mult_pri

extern

staged_req_fuel_mult_sec

uint16_t staged_req_fuel_mult_sec

extern