DETROIT — Siemens AG apparently has gained a competitive diesel-engine lead with high-speed, piezoelectric control of injectors supplied from high-pressure common-rail systems. The ultra-fast piezo-based system permits up to five separate injections per combustion cycle. A diesel injection engineer WEVTU speaks with here explains that two pilot injections, instead of one as now is common, further reduces combustion noise. The dual pilot injections then are followed by two (versus one) main ...

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