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Back: \ MembersPage/JanSaenen '''Input variables where Inj_out is dependant of with vapourised injection''' 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''' ** I guess the fuel pulsewidth needs a *1/sqrt(fuel_pressure) multiplier (we'll likely use a table for sqrt() for speed. ** I have no idea how the fuel temperature will be used. Most likely another table_lookup for viscosity ? ( --- I don't think viscosity of a gas varies much with temperature. Density does , by universal gas laws ; multiply calculated fuel amount by T/Tref - both in degrees K - to correct for that.) When the plan is ready, we'll add to the firmware and make it possible to enable it in config. ---- '''software:''' NTC resistance look-up table: \ MembersPage/NTC Fuel pressure analog signal from sensor is calculated with: Vout=(c1*Pabs+C0)*Us Look-up table for multiplier: \ MembersPage/Fuel_Pressure *Vout = signal output voltage in V *Vs = supply voltage in V *Pabs = absolute pressure in kPa *C0 = -5/350 *C1 = 0.8/350 kPa ^-1 ** OnlineCourse/PulseWidthCalculation 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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