Ten years on from the start of serial production, the international automotive supplier Continental is producing its 40-millionth piezo injector at its Limbach-Oberfrohna/Stollberg site in the German state of Saxony. The injection nozzles are fitted in the engines of passenger cars and commercial vehicles worldwide. “With this ultramodern injection technology we have created the technological conditions for the production of high-performance yet economical diesel and petrol engines which meet even the strictest environmental standards,” comments José Avila, member of the the Continental AG Executive Board and Head of the Powertrain Division.
Around 1,300 people are currently employed in the production of the injectors in Limbach-Oberfrohna/Stollberg. The injectors, which inject diesel into the cylinders at a pressure of around 2,000 bar, are assembled under clean-room conditions. In 2000, piezo technology revolutionized the common rail injection systems used in diesel engines. In this technology, the nozzle in the injector is controlled not by an electromagnet but by a piezo actuator consisting of more than 300 small, wafer-thin ceramic plates arranged one above another.
A switching voltage causes the piezo actuator to expand, which in turn opens the nozzle’s injection holes within milliseconds. These very short response times make it possible for the fuel to be apportioned accurately and repeatedly between up to seven injections per combustion cycle. The result is a highly efficient combustion process because the apportionment of fuel as accurately as possible to the respective operating situation is the principle underlying good thermodynamic engine efficiency. In this respect, piezo technology will help to ensure that the stricter threshold limit values for nitrogen oxides and soot particles under the Euro 6 standard – which will be in force from 2014 – will be complied with, and will also reduce CO2 emissions by a further three per cent compared with conventional diesel direct injection technology. In addition, piezo common rail injection (PCR) engines offer better performance, yet they are both more economical and quieter.
Source: http://www.conti-online.com/generator/www/com/en/continental/pressportal/themes/press_releases/categoryNavigation_overview_press_en.html
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