Found a method for saving diesel enginesDecember 23, 2019
Experts at the Sandia National Laboratories research center have created a fuel injection system for diesel power units, which makes it possible to significantly clean the exhaust.
A diesel engine differs from a gas engine in the method of preparing the working mixture and the method of its ignition. “Heavy” fuel and air are supplied to the combustion chamber separately. First of all, air enters, the temperature of which increases at the end of the compression stroke, and only at the very end diesel fuel is injected into the cylinders, which is instantly flammable.
In the presence of such design features, diesel power plants are characterized by high torque and fuel economy, but the second side of the coin is a more “dirty” exhaust than gasoline engines. According to current Euro 6d-Temp standards, the nitrogen oxide content is 168 mg / km. But next year, new requirements will come into force, requiring manufacturers to reduce this indicator to 120 mg / km in real use and to 80 mg / km for laboratory measurements. However, experts at Sandia National Laboratories have found a method to significantly – by 50 – 100% – reduce the soot content in the exhaust.
It’s all in the form of nozzles with DFI technology (channel fuel injection), where diesel fuel enters the combustion chamber through small channels. Such a solution makes it possible to optimize the composition of the fuel-air mixture and achieve a more “clean” combustion. Here, however, it is worth remembering such a feature of diesel engines as the dependence of the content of nitrogen oxides on the volume of soot – the smaller the first, the greater the second and vice versa.
At the same time, with this technology, you no longer have to use a urea injection system that breaks down nitrogen oxides, but at the same time increases the cost of the motor.
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