Over the past year, Rainbow CNG has been assiduously testing a DDF system that would enable to optimize the performance of Diesel engines without invasion.
Our engineer, Mr. Attilio Guidetti, has been instrumental in developing the electronics with which this system can run.
The Diesel Dual fuel System allows an amount of gas to be injected into the engine through the air intake manifold. This improves the rate at which the engine burns fuel, and this translates into a better performance and/or a saving of fuel.
The DDF can be used with either CNG or LPG gas. Using the CNG gas obviously has a better environmental impact.
Starting in February 2009, Rainbow CNG together with Rainbow Fuel Energy Solutions Inc. first tested the system on some of the Jeepneys crowding the streets of Metro Manila. The Jeepneys with Isuzu C240 engine were found to be running 30% smoother and with noticeably improved engine performance. The production of black engine exhaust smoke was significantly reduced.
The testing has continued over a variety of vehicles in Thailand, from pick ups to cars to minivans. The system was tested successfully on Mercedes MD140 2.9 Vip Van finding that the range of fuel saving with CNG went from 45 % to 48%. and pick up Mitsubishi Strada 2.8 D, finding that the range of fuel saving with LPG went from 30 % to 35%.
Together with Engine Expert Enterprise of Malaysia, a successful test was also carried out on a truck Nissan lorry CD45, 20 ton, finding that the overall saving on Diesel consumption was of more than 40%.
THE CONVERTED NISSAN LORRY ON ROAD TEST
The great advantage of the DDF system is that it allows the vehicle operator the flexibility of using two fuels, can gain both economically and environmentally from this and can revert completely to diesel, which is a bonus in terms of the resale value of the vehicle.
The above graph depicts the flexibility of the system. The configuration can be easily adapted to the customer’s needs and driving style. The customer can decide at which level of RPM he wishes to inject gas into the system and get increased power or savings.
The second graph shows the increase of the torque and consequently the increase in power of the diesel engine in gas configuration.
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