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Current Dual-Fuel™ Technology
Dual-Fuel™ is fitted onto a standard diesel engine, which operates unchanged, except power is generated by mostly clean natural gas. A measured quantity of natural gas is mixed with the air just before it enters the cylinder and compressed to the same levels as the diesel engine to maintain efficiency.
The natural gas mixture does not ignite spontaneously under compression, so the Dual-Fuel™ engine uses a small injection of diesel fuel, around 10% of the total energy of the fuel, to ignite the main charge of gas and air. This small "pilot" injection acts like a multitude of microscopic spark-plugs, setting off clean and efficient combustion of the lean gas-air mixture.
Natural gas burns cleaner than diesel due to its inherently low carbon content. |
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When Natural gas replaces 90% of the diesel through Dual-Fuel™ it can reduce CO2 emissions by up to 25%, yet fuel-efficiency and power remain equivalent to that of the original diesel engine. |
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Clean Air Power believes that no dedicated natural gas trucks can match a Dual-Fuel™ truck for efficiency and performance.
Dual-Fuel™ Engine Technology Facts:
- Engine runs on natural gas with diesel pilot ignition
- At full power diesel fuel is 10% of total fuel - normal operation is up to 85% natural gas substitution
- Runs on 100% diesel fuel until engine coolant is at operating temperature
- Under normal operation, can run solely on diesel at light loads*
- Under normal operation, can run solely on diesel at full power*
- Uses a standard electronically-controlled diesel engine
- Maintains electronic control of both gas and diesel injection
- Base diesel ECU is retained
- Dual-Fuel™ ECU controls gas operation and modifies diesel demand for the diesel engine ECU
- Automatically reverts to diesel only when gas supply is out of acceptable parameters
- Recent introduction of a combustion knock sensor protects the engine from variable gas quality
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The operating system in the technology automatically switches the engine from diesel to natural gas when the truck reaches optimal load, making it particularly suited to long haul heavy trucks. Dual-Fuel™ can be turned off at any time, enabling the engine to operate totally on diesel. This switch from diesel, or to dual fuel is almost imperceptible, even while the vehicle is moving.
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Interfaced Dual-Fuel™ technology – working with OEMs
In addition to providing a Retro-Fit Dual-Fuel™ technology, Clean Air Power has been developing a manufacturer branded and supported Interfaced product. Tests have already demonstrated that a contemporary integrated system will deliver at least 70% overall gas substitution, giving fuel savings of 9p/km per vehicle per year, with CO2 savings of 26 tonnes yearly. Clean Air Power’s integrated C12 product is already certified to Euro 4 standards.
The Dual-Fuel™ Electronic Control Unit (ECU) can be interfaced with Original Equipment Manufacturers’ (OEMs) ECU. This enables the Dual-Fuel™ ECU to control the engine ECU, ensuring optimum conditions for Dual-Fuel combustion. This interface has been successfully achieved on DAF and Mercedes engines and will form the core of any Dual-Fuel application to an engine with OEM cooperation. |
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| How the Interfaced Technology differs from Retro-Fit |
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The "Genesis" retro-fit product uses a standard Dual-Fuel™ ECU that interfaces with the inputs and outputs of the engine ECU, rather than with its software, enabling it to be installed independently of OEM participation. |
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Genesis Dual-Fuel™ Product:
- Retro-fit product for new/used Euro 3 vehicles
- Simplified engine control with no direct communication with OEM engine controller software
- Delivers acceptable gas substitution, vehicle performance,
CO2 and fuel cost saving
- Product development focused on consolidation of vehicle variants:
- Mercedes Axor 4x2 CNG/LNG and 6x2 LNG
- DAF CF85 4x2 CNG/LNG and 6x2 LNG
- Developed with limited OEM engineering support
Read the full Press Release Report on Genesis Dual-Fuel™ Product
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