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Biodiesel Vehicles

May 2008 - Posts

  • Official EPA Estimates for New VW TDI Sportwagen

    These came in a bit lower (quite a bit) than earlier predictions but the first wave of "affordable" Clean Diesel Vehicles is on the way.

     

    Officially Official: EPA rates 2009 Jetta TDI at 30/41mpg



    The 2009 Volkswagen Jetta TDI is coming to VW dealers this summer as the first of the new batch of 50 state clean diesels and the official EPA fuel economy numbers are now out. The diesel has come in with ratings of 30mpg on the urban cycle and 41mpg on the highway cycle. Those numbers are a bit lower than expected, with Volkswagen having implied previously implied that 40mpg both city and highway were possible. More recently they have indicated that real world highway figures of up to 60mpg were possible.

    Regardless of the expectations we might have had, these numbers are a huge improvement over the current 2.5L five cylinder and 2.0L turbo offerings. The 34mpg combined figure is a 41.7 percent improvement over the 2.5L and 36 percent boost over the 2.0L. The Prius is rated at 48/45mpg city/highway. We'll be looking forward to our chance to evaluate a new Jetta TDI to see how it does in the real world.

    Update: We just talked to VW spokesman Keith Price about the EPA numbers and his response was that the VW TDIs typically do better in real world mileage performance than the official ratings. We'll reserve judgement until we get our hands on one in late June.


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  • New Injector Boasts of Reduction in Diesel Vs. Gas Engine Premium

     A new injector by Continental claims it allows more precise metering of the fuel pulses, allowing for reduced fuel consumtion and emmisions reductions by as much as 35% over current injectors. This is claimed to allow elimination of the NOx aftertreatment systems and full compliance with Tier 2, Bin 5 US (Euro VI) standards.             Interesting!!

     

    Continental announces new piezo injector that makes diesels even cleaner

    One of the keys to making the latest generation of diesel engines as clean and efficient as they are has been common rail injection systems and, more recently, piezo electric injectors. Continental Automotive Systems has just introduced a new type of piezo injector that may take diesels to the next level. Earlier injectors used electro-magnetic solenoids to move the injector needles allowing fuel to flow into the combustion chamber. Piezo injectors use a stack of piezo crystal plates that expand when an electric current is applied. That expansion causes the needle to move. The expansion of the piezo crystals is more precise and repeatable than the electro-magnetic solenoids allowing for more precise fuel metering for lower consumption and emissions.

    Continental's new injector design takes advantage of the precision and reproducibility of the piezo crystals by adding position sensing to the needle itself. Because the position of the needle in time now correlates so well to the fuel flow rate, the potential exists to be able to eliminate other sensors that are being used to control diesel fuel systems. High pressure common rail injection systems typically use 5 -7 individual injection pulses per combustion cycle. Because the fuel flow can be measured in real time with the new injectors, the size of individual pulses within the sequence can be varied for even lower fuel consumption and emissions. Continental is claiming the new injectors help achieve a 35 percent reduction in particulate and NOx emissions. An engine optimized for these injectors could potentially meet the Euro VI (and equivalent US Tier 2 Bin 5) standards without the need for any costly NOx aftertreatment. This would help cut the cost premium between gas and diesel engines.

    [Source: Continental]
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