FUEL model (calc) v3.0

Fuel based model giving precise torque value. THIS OPTION IS RECOMMENDED FOR CLOSED LOOP unless Your ECU provides precise torque value over CAN bus.

Configuration of FUEL model TORQUE calculation can be found in GENERAL SETTINGS and in tuning tables in some cases.

Filling engine parameters is a simple task. Rev limiter START [RPM] refers to RPM when ECU starts to cut fuel to limit max engine speed. It’s crucial to be set to avoid false torque reading at rev limiter!

Split Injection system allows using two different types of fuel independently. Each of sets has it’s independent INPUTS in IO ASSIGNMENTS tab.

1. Fuel type – presets defines stoich AFR, density and energy unless “USER DEFINED”
   1. Gasoline
   2. FLEX fuel – uses assigned FELX fuel sensor to measure mixture blend and calculate stoich AFR, density and energy
   3. Ethanol E100
   4. Ethanol E85
   5. Methanol
   6. User defined – uses user defined tables (TORQUE TABLES) to define fuel used
2. Injector size – injector flow in CC at it’s reference pressure
3. Injector dead time [uS] – used to achieve more precise torque value:
   1. Do not use – does not deduct dead time from InjPW value. It’s recommended when ECU reports EFFECTIVE InjPW value
   2. Input – uses value of assigned input to deduct dead time from InjPW input
   3. User defined (table) – uses Injector dead timetable to deduct defined value
4. Fuel density [mg/ccm]:
   1. Default – uses preset / calculated value
   2. User defined (table) – uses Fuel density table. Mandatory when using User Defined fuel
5. Fuel efficiency [MJ/kg]:
   1. Default – uses preset / calculated value
   2. User defined (table) – uses Fuel efficiency table. Mandatory when using User Defined fuel

Make sure mandatory inputs are assigned and calibrated properly if manual created objects are used.

• Engine RPM
• Engine MAP (kPa)
• Throttle position sensor (%)
• Lambda
• Injection time (us) hint: it is advised to stream EFFECTIVE injection time that excludes dead-time of injectors. If not possible use final injection time and fill injector deadtime table in torque tables section.

More parameters are used but if not assigned then mockup values are used instead.

Make sure mandatory tables are set correctly

• Lambda Efficiency (set to 1 unless You know exact figures. Also set to 1 if Lambda sensor is not available, or if unsure how to set it up)

Output of fuel model should be close to real torque values in [Nm]. Proper ECU tune is solid base to good torque calculation (engine cannot be flooded or too lean).