TOKYO - Denso plans to launch a new, 1,800-bar common-rail diesel system this year in the European market. The Japanese auto-parts maker is aiming for a production volume for all of its common-rail systems of more than one million a year by 2005.
The higher injection pressure system helps to reduce particulate matter (PM) and to raise engine performance.
In addition, the new system uses five injections during each combustion stroke to control the combustion rate, which results in reduced emissions.
A pre-injection that occurs a split-second before each main injection shortens injection delay in the main injection and thereby reduces the generation of nitrogen oxides (NOx), noise, and vibration. An "after" injection a split-second after the main injection reburns any remaining PM. Then a "post" injection helps manage the temperature of the exhaust gas, which makes the catalytic exhaust processing more effective. The "post" injection also provides hydrocarbon as a reduction agent to NOx.
The interval between the end of the pre-injection and the start of the main injection is 0.4 milliseconds, the industry's shortest, Denso said. Denso plans to further reduce the interval with piezo injectors.