He remains “very confident” that Delphi will continue producing solenoid-based diesel injectors for many years to come. “For some customers, cost may be less important than image, so they might decide for piezo,” he adds, “even if they could have a solenoid solution.” Because solenoid is still much cheaper than piezo, and the cost is very important,” Barth says. “If a customer would like to have piezo just to be able to say, ‘I have piezo technology,’ then what we offer to our customers is a choice. He says the next-generation Multec system will be ready for market next year.īarth tells Ward's that piezo injectors are at least twice as expensive as solenoids, and that auto makers developing new engines may struggle to justify the added expense for piezo.Įchoing comments from Denso officials at last spring's Society of Automotive Engineers World Congress in Detroit, Barth says some auto makers are interested in “piezo” because the moniker has a high-tech ring to it. He says Delphi's Piezotec actuators will improve emissions by up to 30% when compared to today's “best piezo common-rail technologies.”īut Barth says Delphi has managed to exceed Euro 4 emissions requirements without piezo actuators and further expects to meet the more stringent Euro 5 regulations by optimizing its solenoid-based Multec fuel injectors. Volker Barth, president of Delphi Europe, Middle East and Africa, calls piezo an “important advancement” and admits his company will produce its first piezo injectors in Europe around 2006. That speed translates into more precise shaping of the air-fuel mixture, which means quieter, more fuel-efficient, cleaner and more powerful diesel engines.īut at its Frankfurt press conference, Delphi suggests piezo actuators will not necessarily replace the conventional solenoid valves that have sustained diesel fuel injectors for years. Piezo actuators are incredibly quick, injecting fuel into the cylinder in less than ten thousandths of a second - up to six times faster than conventional solenoid valves. Siemens was the first three years ago to incorporate quick-firing piezo (pronounced pee-AY-tso) actuators in diesel injectors, and the other major players have said they will follow the same technological path, including Robert Bosch GmbH, Denso Corp. Standing in adjoining booths on the second level of Hall 5 were two parts makers that have staked out turf in Europe's bustling market for diesel fuel injectors: Siemens VDO Automotive Corp. It was curious placement for two rival automotive suppliers at this month's Frankfurt Motor Show.
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