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| Compared with gasoline-powered vehicles, diesel vehicles can run longer distances with less fuel, are more powerful, and generate less CO2 that causes global warming. Despite these positive features, diesel vehicles create emissions containing air pollutants, such as nitrogen oxides (NOx) and particulate matter (PM). The previous technology for diesel engines generated more particulate matter when the fuel combustion method was changed in order to reduce NOx, or conversely, generated more NOx when attempting to reduce the particulate matter. |
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| In response to this, DENSO developed a world-first method, called the 'Common Rail System.' This system has a special structure to change the fuel into a fine spray by applying amazingly high pressure, equivalent to the pressure of water at a depth of 18,000 meters (more than 11 miles) in order to combust fuel without creating particulate matter. In comparison, the world's deepest ocean bottom in the Marianas Trench is 10,668 meters, or only 6.6 miles deep. When fuel is combusted all at one time at high temperature, it usually generates NOx. DENSO's common rail system injects fuel at such an incredibly high speed and at intervals of 0.4 milliseconds (that's one twenty-five hundredth of a second) in only the small quantity required-only one-fiftieth of a drop of fuel. As a result, the system remarkably reduces the amount of NOx. This marvelous system consists of a great combination of very sophisticated technology, created from parts as precise and elaborate as one-thousandth of a millimeter (one twenty-five thousandth of an inch), and electronics that enable a small-sized computer to control parts ultra-fast and in ultra-precise movements. |
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