A Revolution In Diesel Injection?

The self-pressurized RK Injector utilizes the pressure from the piston compression in the combustion chamber. Diesel fuel is injected in about 180 tiny droplets under more than 5 000 bar pressure.

By ROBERTA PRANDI

Switzerland-based RKLAB AG is developing a self-pressurizing diesel fuel injector that the company said has the potential to reduce engine emissions dramatically.

The RK Injector is a direct replacement for current common rail diesel fuel injection systems and offers a significant reduction in cost, weight, and both NOx and particulate emissions, the company said. It also offers 15% or greater fuel efficiency improvement.

Markets for the RK Injector include generator sets, rail and marine engines as well as heavy and light trucks and construction and agricultural machinery.

As a self-pressurizing diesel fuel injector, the RK Injector receives its initial compression from the piston compression in the combustion chamber. The RK Injector multiplies the initial combustion chamber pressure within the injector and forces the diesel fuel into the combustion chamber at significantly higher pressure through up to 180 tiny holes, the company said.

RKLAB said that with the RK injector system, the ultra-high pressures through a very large number of smaller injection holes creates optimal combustion conditions within the combustion chamber: high pressure, smaller fuel droplet size and lower combustion temperatures.

The dispersal nozzle of the RK Injector injects the diesel in about 180 tiny droplets under more than 5 000 bar pressure in a spray pattern that further improving the combustion process, compared to the current, common rail injection system with only as few as four to eight holes, RKLAB said.

This atomization of the fuel particles improves the mixing of the air and fuel in the combustion chamber, which not only improves the combustion process but also lowers the temperature and the compression within the combustion chamber, according to RKLAB. Developing a more complete combustion of the fuel at lower temperature and lower combustion compressions leads to better fuel economy, reduction in particulate emissions and the reduction in NOx.

RKLAB recently signed a joint development agreement with Mazda Motor Co. of Japan for the further development and optimization of the RK injector technology for use in diesel engines. This agreement is a comprehensive program which will be rolled out over the next two years to evaluate, test and improve the injector for use in the next generation of diesel engines, the company said.

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