The Dual Injector System has been designed to reduce fuel consumption, and Nissan says this is the first technology of it's kind in the world to be used in mass production cars. The new system uses a new type of distribution system to inject fuel into the cylinders.
Instead of using just one injector per cylinder, the new system uses one injector for each port. This splits the fuel distibution as it enters the cylinder, which in turn speeds up vaporization of the fuel. (Internal combustion engines need to convert fuel from a liquid form into a vaporized form before the fuel can be ignited.)
By configuring one injector per inlet port, instead of just one injector per cylinder, the vaporization process is completed more efficiently, breaking up the fuel particles into smaller droplets. This means that less unburnt fuel is expelled, and the fuel is actually being burnt at a much more efficient rate.
By burning fuel more efficiently, the system thereby also reduces hydrocarbon emmisions.
In addition, the system also adds continuous valve timing control on the exhaust side, as opposed to the usual intake-side control only. This improves the engines' heat control and raises fuel efficiency by up to 4% compared to other Nissan petrol/gas-powered engines in the same class. While the system is similar to already in-use "direct injection" systems, the systems are difficult to use on smaller sized engines, because of the need for a high-pressure pump which produces problems for efficient system design, thereby making componenet design less cost efficient.
The Nissan Dual Injector system provides fuel to the cylinders at normal pressures, reducing the cost of such a system by about 60% compared to other engines of similar size using direct-injection.
The new system also uses half the amount of rare materials normally used in the catalyzer, but maintains the efficiency of the catalytic converter.
Nissan says it continues to promote the "Nissan Green Program 2010" by implementing effective technologies, products and services to the market.
Source : www.nissan-global.com
