Electronic Fuel Injection system (EFI) is the core technology of EFIgenset generators. Since early 80's, all cars enter USA must meet OBD-I emission requirements which can only be achieved by EFI system, not carburetors. It curbs a large portion of air pollution from automobile exhaust as general carbureted cars produce 80% of total automobile pollution in the United States in 1990. Stiffer emission laws require ODB-II in 1995 on all new cars running on the American roads.
Engine Control Unit (ECU) is the main component to deliver EFI technology. The data representing the amount of power output desired by the electrical load is used by the ECU in calculating the amount of fuel required. A throttle position sensor (TPS) provides this information. Other engine sensors include a coolant temperature sensor, a crankshaft position sensor, manifold absolute pressure (MAP) sensor and a wide band oxygen sensor which is installed in the exhaust system so that it can be used to determine how well the fuel has been combusted, therefore allowing closed loop operation to occur. When signaled by the ECU, the fuel injector opens and sprays the pressurised fuel into the engine. The duration that the injector is open is proportional to the amount of fuel delivered.
 Electronic fuel injection systems optimize these competing objectives more effectively and consistently than carburetors. The objectives of EFI are:
- Power output
- Fuel efficiency
- Emissions performance
- Running on alternative fuels
- Reliability
- Smooth operation
- Maintenance cost
- Diagnostic capability
- Range of environmental operation
- Engine tuning
 Developed by our American team in Chicago, EFIgenset ECU incorporates a built-in Magnum governor. Generator ECU is quite different than an automobile ECU because generator demands faster response to transient loads in order to stabilize the voltage and frequency while automobile is more forgiving on the speed requirement. Time required for a car to get from point A to point B does not terribly upset the passengers if they are a few seconds, or even a few minutes, longer than they expect. Inductiveappliances such as air conditioner, refrigerator, fan, and electric door opener motor are very sensitive to voltage frequency. A rated frequency of 220V 50Hz air conditioner runs on 45Hz power line will suffer from damages. It is very important to maintain a stable voltage and frequency output by a generator.
Voltage frequency is directly proportional to generator engine speed. The engine speed is maintained by a governor (engine speed adjuster). Cruise control in a car controls the road speed while generator engine rpm is controlled by the governor. Attempts have been made to use an automobile ECU with cruise control to run a generator, the result is disappointing. It will damage the inductive appliances in no time.
It is essential to optimize EFI systems competing objectives. EFIgenset JPLPG15N is able to deliver zero recovery time at the maximum transient on load and off load activities, easy start in all climate conditions, minimal pollution and fuel economy. This amazingperformance is resulted from years of dedicated R&D in propane and compressed natural gas EFI project.
An independent project called Magnum Governor is implemented with the EFIgenset ECU to incorporate a built-in governor to work in conjunction with the injectors, ignition timing, MAP sensor and electronic throttle body to render the best results in different fuel types and environmental influences. Air/Fuel Ratio (AFR) and ignition timing must match to deliver complete combustion for maximum power output. Compressed Natural gas (CNG), for example, requires more advanced ignition timing than LPG. EFIgenset ECU can be tuned to manage a high compression ratio (12:1) of a CNG engine.

More comparative information about EFI and carbureted generators can be found in the Support section of this website.