DIESEL + CNG DUAL-FUEL SYSTEMS FOR GENERATORS
Replace up to 70% of generator diesel with CNG.
MIJO adds electronically controlled CNG delivery to a compatible diesel generator while diesel remains the pilot fuel. Gas quantity is calibrated against engine load, and the generator continues on diesel alone whenever CNG is unavailable or operating conditions move outside the calibrated range.
Actual diesel substitution depends on the engine, injection system, operating load, gas quality and pressure, ambient conditions and calibration.
HOW GENERATOR DUAL FUEL WORKS
Diesel ignition. Controlled CNG substitution.
Dual fuel does not make the generator a 100% CNG engine. It keeps the original diesel combustion principle and substitutes part of the diesel with CNG only inside the engine's calibrated operating window.
Diesel start and pilot ignition
The generator starts and stabilises on diesel. During dual-fuel operation, diesel remains the pilot fuel that initiates combustion.
CNG introduced at suitable load
After the required operating conditions are reached, the system begins adding CNG and reduces diesel demand within the calibrated limits.
Gas delivery follows engine demand
The control system uses engine and load information to regulate CNG delivery instead of applying one fixed gas quantity at every load.
Automatic diesel-only fallback
If CNG supply is interrupted or a monitored condition moves outside the calibrated range, the generator continues on diesel alone.
APPLICATION ASSESSMENT
The engine, injection system and load profile decide the solution.
A generator is specified from technical data and real operating duty—not only from the kVA number printed on its nameplate.
Generator rating and engine
The generator kVA/kW rating, engine make, model, cylinder count and rated speed establish the system capacity.
Diesel-injection technology
Mechanical injection-pump and electronically controlled engines require different signals, interfaces and application checks.
Turbo and air system
Naturally aspirated and turbocharged engines are assessed separately because airflow, boost and load behaviour affect gas delivery.
Real operating load
Typical load percentage, load changes, daily running hours and measured diesel consumption are essential for calibration and economics.
SYSTEM ARCHITECTURE
The principal control, gas-delivery and sensing groups.
The final component capacity, sensor set and installation layout change with the confirmed generator engine and site gas supply.
Dual-fuel ECU & wiring
Processes engine inputs and commands the calibrated CNG quantity for the confirmed generator.
CNG reducer & shut-off
Reduces the CNG supply to the required working pressure and isolates gas when commanded.
Injector
Meters the required CNG quantity into the engine intake path through an arrangement sized for the application.
T-MAP sensor
Measures the pressure and temperature inputs used to regulate CNG delivery.
Knock sensor
Provides a combustion-protection input where required by the confirmed engine configuration.
Crank sensor
Provides the engine-speed and position reference required by the dual-fuel control strategy.
Exhaust sensor
Monitors exhaust conditions as part of the calibrated protection strategy.
The groups above explain the system architecture. Final wiring harnesses, injectors, valves, pipework, brackets, sensors and fitting accessories are supplied according to the confirmed engine and installation configuration.
CALCULATE SAVINGS CORRECTLY
Diesel substitution is not the same as fuel-cost saving.
The commercial result must use measured fuel consumption and actual local prices. A higher gas share can reduce diesel use, but the saving percentage comes only from comparing the total fuel cost before and after conversion.
FROM ENGINE DATA TO COMMISSIONING
A complete generator-conversion workflow.
The useful result comes from site data, correct hardware sizing and calibration under the generator's real load conditions.
Application assessment
MIJO reviews the generator, engine, injection system, operating load, diesel consumption and available CNG supply.
Engineering specification
The control unit, gas-flow capacity, sensing, pressure regulation, pipework and installation scope are selected.
Installation & integration
Hardware is installed with the engine-specific wiring, gas routing, shut-off devices, brackets and fittings.
Load calibration & commissioning
Gas substitution, diesel stability, temperatures, speed response and fallback behaviour are checked across the usable load range.
Training & support
The project can include operator guidance, technician training, spare-parts planning and after-sales coordination.
PREPARE YOUR ASSESSMENT
Send the data needed to size the system properly.
Photographs of the engine nameplate, injection system and generator installation help MIJO review the application faster.
Generator make, model and kVA/kW ratingEngine make, model, cylinder count and rated speedMechanical or electronic diesel-injection systemNaturally aspirated or turbocharged engineTypical load percentage and daily running hoursMeasured diesel consumption in litres per hourAvailable CNG source, pressure and gas specificationSite location, quantity and installation responsibility
PROJECT SUPPORT
GENERATOR DUAL-FUEL QUESTIONS
What must be clear before selection.
Does dual fuel convert the generator to 100% CNG?
No. This is a diesel+CNG dual-fuel system. Diesel remains the pilot fuel during dual-fuel operation, while CNG replaces a calibrated portion of diesel use.
Is 70% diesel substitution guaranteed on every generator?
No. Up to 70% is a system target under suitable operating conditions. The actual result depends on the engine, injection system, steady operating load, gas quality and pressure, ambient conditions and calibration.
What happens if the CNG supply stops?
The control system is designed to stop CNG delivery and allow the generator to continue on diesel alone, subject to the confirmed installation and commissioning configuration.
Can MIJO assess small and large generators?
Yes. MIJO studies applications from smaller backup generators to commercial and industrial generator sets. Final suitability and hardware are confirmed from the exact engine and duty data.
How are generator savings calculated?
Savings are calculated from measured baseline diesel litres per hour, the remaining diesel and CNG consumption after conversion, actual fuel prices, operating load and running hours. Diesel-substitution percentage is not treated as the same thing as fuel-cost saving percentage.
What is covered by MIJO project support?
The agreed programme scope can include engineering, installation, load calibration, commissioning, operator or technician training, MIJO kit-component warranty and after-sales support. Confirm the duration, coverage and service arrangements in the written export quotation.
GENERATOR CONVERSION ASSESSMENT
Start with the generator data—not a generic kit list.
Share the engine, generator rating, injection type, operating load, diesel consumption and available CNG supply. MIJO will review the application and define the next engineering step.