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Back: \ MembersPage/JanSaenen '''Input variables where Inj_out is dependant of with vapourised injection''' Used sensor: Bosch 0 281 002 576 Free ADC inputs mcp3208: * EC18pin12 available ADC because secondary_trigger: HALL * EC18pin6 available ADC because onboard MAP * EC18pin16 * EC36pin13 used for secondary trigger Hall '''injection pulsewidth calculation''' ** For Fuelpressure: PW*MULTIPLIERpressure (look-up table) \ MembersPage/Fuel ** Fueltemperature PW*MULTIPLIERtemperature uses a look-up table (NTC) \ MembersPage/NTC Density of a gas (eg. air) by universal gas law: proportional to 1/T (so multiply calculated fuel amount by Tref / T, both in degrees K: traditionally called "airdenfactor" that we make match matfactor - see EasyTherm) For liquid injection, the liquid flowrate (through an injector) is proportional to sqrt(pressure) so we need to multiply fuel pw with (pressure ^ -0.5). How to know pressure (over the injector!) is another question. * Maybe it's regulated to a known value * or maybe in some cases it's lower and directly or indirectly (eg. via tank temp and known curves) measured actual fuel pressure must be considered. ** OnlineCourse/PulseWidthCalculation *PWlpg=PW*MULTIPLIERpressure*MULTIPLIERtemperature Nice data sheets for gasses: http://www.airliquide.com/en/business/products/gases/gasdata/index.asp?GasID=53 With this graph of pressure and temperature of Propane: http://www.airliquide.com/en/business/products/gases/gasdata/images/VaporPressureGraph/Propane_Vapor_Pressure.GIF Same graph for butane-n: http://www.airliquide.com/en/business/products/gases/gasdata/images/VaporPressureGraph/Butane_Vapor_Pressure.GIF
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