MembersPage/JanSaenen/Vapourised (2006-02-22 04:33:06)

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Input variables where Inj_out is dependant of...

As my car will be running on Vapourised LPG injection my Inj_output timing will be dependant of Fuelpressure and Fueltemperature. I already have a sensor mounted that's able to collect these values Bosch 0 281 002 576.

Connect the signal to free ADC inputs - mcp3208. Check the shop text for free inputs. Apparently

When the plan is ready, we'll add to the firmware and make it possible to enable it in config.


LPG needs some extra analog inputs to work

I want to run fully sequential injection and ignition with and Hall sensor as secondary trigger.

It's not needed to alter the hardware of my genboard to use it with Vapourised Sequential LPG Injection.

Fully sequential is configured in config (the EC36pin13 is only used for cam-HALL, not normally reused for other tasks anyway).

software:

From what I understand you need 4 look-up tables:

  • Vout temperature sensor Fuel_temp => NTC look-up table
  • Vout pressure sensor Fuel_pressure => calculated with a code shown below
  • Fuel_temp : Density => look-up table with multiplier
  • Fuel_pressure : Density => look-up table with multiplier

What is Vsens_out for ?

Vout from the Fuel_pressure sensor is calculated with:

Vout=(c1*Pabs+C0)*Us

TempSensor=>analog signal (Sensor Vout)=>AD-Converter=>digital signal=>Look-up table=>digital temperature

So the look-up table will contain Temperature and a digital value (devision 2^n in this case a 8-bit value)

Whoooo check this site:

http://www.airliquide.com/en/business/products/gases/gasdata/index.asp?GasID=53

With this graph of pressure and temperature:

Propane_Vapor_Pressure.GIF