Alpha setting

Technical description of the controller APOLO ALPHA

The controllers type APOLO ALPHA are programmable ECU designed to management of the LPG/CNG fuelling system installed on the vehicles with conventional petrol injection systems (not for direct petrol injection).

Installed in these vehicles, controllers APOLO ALPHA are made a part of EMS (Engine Management System) responsible for control fuelling system when engine runs on LPG/CNG.

The controllers type APOLO ALPHA have been designed as modern, highly technological advanced units, provided with all indispensable features for performing ECU's role in the most demanded fuelling system found in vehicles.

The most important features are:

- Programmability of I/O signals and processing parameters

      Adjust to needs of fuelling system found in vehicle;

- Self-adaptation properties (plug and drive system)

     Ensuring a choice of data processing parameters according to conditions found in system

- Auto-diagnosis properties

     Allow to detect of weaknesses in the system and correct them.


PICTURE 1 – Settings



  1. Set engine’s cylinder numbers
  2. Set proper numbers of coils per one cylinder in order to get right value of RPM
  3. Set proper RPM signal level (if signal is taken from the ignition coil 12V)
  4. Set engine type: Standard (naturally aspired) or Turbocharged
  5. Set original system injection type (sequential or full group)
  6. Set controlling signal for petrol injectors (usually by ground, when it is controlled by “+” change the value)
  7. Set proper type of λ-sensor



  1. Set Fuel type (LPG or CNG)
  2. Set used Gas injectors
  3. Set used gas pressure sensor (APOLLO 4bar comes with the set)
  4. Set proper reducer temperature sensor (usually 10K, check with the real temperature of the engine)
  5. Set used gas temperature sensor (standard 2.2K comes with the set)
  6. Set used MAP pressure sensor (APOLLO 4bar comes with the set, integrated with gas pressure sensor)



  1. Set used type of LPG level sensor, or
  2. You can choose custom values for each level.

PICTURE 2 – Changeover

SWITCH TO GAS (conditions which should be met for switching to gas):

  1. Set minimal temperature to switch on gas (it is strongly recommended switching reducer temperature to be over 40oC)
  2. Set minimal RPM to switch on gas
  3. Set changeover time for cold engine (it is recommended from 10 to 25 seconds)
  4. Set changeover delay per one cylinder (for Full group injection systems set “0.0”!)
  5. Switch on or off changeover simultaneously (for Full group injection systems “switch on”
  6. Set switch changeover time for hot engine (usually 2 seconds, could be less)


SWITCH TO PETROL (conditions for switching back to petrol):

  1. Set maximum RPM to switch back on petrol (by customer will)
  2. Set maximum engine load to switch back on petrol (by customer will)
  3. Set minimum RPM to switch back on petrol
  4. Set minimum gas temperature to switch back on petrol
  5. Minimum and Working gas pressure will be set automatically after auto calibration. When these values are set manually, they should be updated every time
  6. Set gas pressure error time (it is recommended to set 0,5 seconds, could be up to 1 second)

PICTURE 3 – Calibration

  1. Wait for the engine (reducer) temperature of 50oC. Engine should run on idle, on petrol and with all electric consumers turned off (lights, window heaters, AC, fan, etc.)
  2. Click on Autocalibration button and follow the instructions on the screens during the autocalibration process
  3. If everything set right, Correction value [ms] will be in the safe margins (from 0.5 up to 2.5 ms), if not, set right values of injector nozzle diameter and/or gas pressure and repeat procedure.


PICTURE 4 – Calibration panel (self adaptation system during driving)

  1. Drive for the while to collect petrol and gas map of injection times (it is recommended to collect at least 70% of each map)
  2. If the distance between petrol and gas maps is too large, click on the Calculate and then Erase gas button in Autocalibration panel, and collect new gas map.
  3. Too insure that these two maps keeps acceptable distance, turn Autoadaptation and Petrol lock mode ON.
  4. Autoadaptation mode works from injection times defined in field Start [ms]. Since Autocalibration defined injection times in idle, it is recomended to set Start time from 4 or 5 ms.
  5. Adaptation of injection time will be posibble in defined margins (field Max. Multiplier). If everything installed and setted right, this margin should not be over 10% (0,1), although it can be set up to even 50%. It is recommended this value not to exceed 20% (0,2).















PICTURE 5 – Advanced panel

  1. Injector warming up – switching on or off working of LPG injectors while engine works on petrol in order to warm them up.
  2. Warming time [s] – injectors warming time
  3. Enrichment – switch on/off mixture enrichment
  4. Enrichment level [%] – level of mixture enrichment in percentage
  5. Short petrol pulses ignoring – ignors possible disturbing (low level) signals
  6. Hot start and hot engine temperature – allows starting engine on gas at defined conditions
  7. Gas pressure correction – switch on/off corrections of gas injection times according to pressure changing
  8. Exit from cut-off through petrol, and Cut-off pressure – switching on petrol in defined conditions
  9. Return to gas after [s] – switching back to gas after cut-of exit to petrol in defined seconds.
  10. Lubrification – alows in defined conditions to use petrol injection as „lubrification system“ in order to protect engine valves.




Wiring diagram