Nissan Motor Co. today announced that it has developed a dual injector system that can improve the fuel efficiency of small gasoline engines by 4 percent. ———- Right, one port of the new dual injector. Far right, a conventional system injecting to both ports. ———- That's significant, because it will be awhile before electric motors, compressed-air engines and the like replace internal combustion engines. The new system is scheduled to appear in Nissan vehicles starting next year. The new fuel delivery system, the first of its kind in the world for mass-produced passenger cars, uses an injector for each port rather than one per cylinder. That improves fuel vaporization and reduces the amount of unburned fuel and hydrocarbon emissions. While most gasoline engines utilize one injector per cylinder – supplying fuel to two intake ports – the new dual injector system doubles the number of injectors per cylinder. This reduces the diameter of the fuel droplets by about 60 percent, which the automaker says results in smoother, more stable combustion. The system also adds continuous valve timing control on the exhaust side to conventional intake-side control, improving heat efficiency, reducing pumping losses and raising fuel efficiency by up to 4 percent compared with Nissan gasoline-powered engines in the same class. While similar in theory to direct-injection systems, which also inject fuel directly into cylinders, such systems are difficult to use on small-displacement engines because they require a high-pressure pump that complicates system design, making component layout less cost-efficient. The dual injector system ( left ), on the other hand, is lighter and structurally simpler because it supplies fuel at what Nissan calls “normal pressures,” reducing cost by about 60 percent compared to direct-injection…
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Nissan Unveils Dual Injector System for Better Fuel Efficiency in Small Gas Engines
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