DETROIT, Nov. 12, 2015 – Honda, Delphi Automotive and DuPont Automotive captured the most innovative use of plastics award in the powertrain category at last night’s 45th Society of Plastics Engineers (SPE®) Automotive Innovation Awards Competition & Gala. The team was awarded for the development of the Delphi Multec® 3.5 Heated Tip Port Fuel Injector used on the Honda Fit and Honda City vehicles sold in Brazil to improve cold-start performance in ethanol-fueled vehicles.
The Multec® 3.5 Heated Tip Port Fuel Injector has an integrated heating device that rapidly heats ethanol fuel so it can evaporate and be ignited more efficiently in cold weather. The integrated component, overmolded with DuPont™ Zytel® HTN PPA, eliminates a secondary gasoline tank, commonly used to improve cold start.“Cold start is a fairly pervasive issue in vehicles that run on 100 percent ethanol (E100), like those in Brazil,” said Dave Dues, Delphi Flex Fuel Vehicles Program chief engineer. E100 does not form a combustible vapor at cold temperatures so engine-starting under these conditions is not possible with a conventional system. In Brazil where E100 fuel is commonly used, most automakers add a second gasoline fuel system for starting below 55°F (13°C). “The team captured this award with an innovation that not only solves the issue but does it in a way that reduces weight by 9 kg to improve fuel economy, lowers emissions and significantly lowers cost by eliminating that secondary gasoline sub-tank system,” added Dues.
Zytel® HTN PPA was selected to overmold the component because it offers lower melt viscosity than competing PPA, which helps protect the sub-assembly during molding. It also offers better elongation than other PPAs to survive thermal cycling without stress cracking. Once the material family was selected, DuPont developed a new electrically friendly, heat-stabilized grade that also can be laser marked for identification.
Extensive Moldflow® analysis was performed by Delphi and DuPont to ensure the mold filling produced a knit-line free part. In addition, cavity pressure transducers were added to the mold tooling to prevent collapse of the thin metal heating tube during overmolding.
“Zytel® HTN PPA offers high performance plus ease of molding making it a great choice for this application,” said Randy White, DuPont Automotive global powertrain segment leader. “Connecting early with Delphi allowed us to modify the material to the performance requirements as they evolved through the development cycle.”
Zytel® HTN PPA is often used by the automotive industry to make engine cooling components, such as thermostat housings and water pumps, and to make powertrain components, such as charged air coolers, transmission housings, engine oil systems, brake systems, ignition systems and motors. In electrical and electronics markets, Zytel® HTN PPA often is used to make lead-free SMT (surface mount technology) and traditional connectors, high-voltage insulators and structural components for hand-held devices.
SPE’s Automotive Innovation Awards program is the oldest and largest competition of its kind in the automotive and plastics industries.
DuPont offers more than 100 materials and product families for the global automotive industry. Through its global application development network, DuPont Automotive is committed to collaborating with customers throughout the value chain to develop new products, materials, components and systems that help reduce dependence on fossil fuels and protect people and the environment. For more information, visit automotive.dupont.com.
DuPont (NYSE: DD) has been bringing world-class science and engineering to the global marketplace in the form of innovative products, materials, and services since 1802. The company believes that by collaborating with customers, governments, NGOs, and thought leaders we can help find solutions to such global challenges as providing enough healthy food for people everywhere, decreasing dependence on fossil fuels, and protecting life and the environment. For additional information about DuPont and its commitment to inclusive innovation, please visit http://www.dupont.com.
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Multec® is a registered trademark of Delphi Automotive LLP.
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