Volkswagen Brings Fuel Shut-Off To The Four Cylinder Engine
2011 Volkswagen Jetta
Cylinder deactivation isn’t a new idea; the technology was first implemented (with only moderate success) in the days following World War II. Over the past ten years, cylinder deactivation has become mainstream, and manufacturers routinely employ this on their V-6 and V-8 engines to boost fuel economy up to 20 percent.
No manufacturer has deployed the technology on a four-cylinder engine, at least until now. Volkswagen has announced that their 1.4-liter TSI engine, used on the European market Golf, Jetta, Scirocco and Tiguan, will utilize cylinder deactivation beginning in 2012.
The results of Volkswagen’s testing are impressive. On the European test cycle, cylinder deactivation is expected to improve fuel economy by some 2.5 miles per gallon; when combined with start / stop functionality, that figure will increase to around 3.9 miles per gallon.
The European test cycle for fuel economy is somewhat more optimistic than our own EPA testing, which typically delivers results 10 to 20 percent lower, but the potential fuel savings are still significant.
Cylinder shut-off will only occur under constant-throttle conditions, with the engine speed between 1,400 and 4,000 rpm. When the gas pedal position sensor detects a sudden change in throttle setting, the system instantly deactivates and the engine resumes running on all four cylinders. Volkswagen estimates that, based on the European fuel economy driving cycle, cylinder shut-off will be employed for 70 percent of a driver’s time behind the wheel.
Volkswagen will begin using cylinder deactivation on their 1.4-liter TSI engine for European market vehicles in 2012. There are no plans to bring this engine to the United States at the current time, but it stands to reason that Volkswagen may eventually deploy cylinder deactivation across their engine range as a way of boosting Corporate Average Fuel Economy.
This was an article from GreenCarReports.com… Here is another interesting article on the latest VW Green frontier…
The 2011 Volkswagen NILS Concept Revealed!
The Volkswagen NILS Concept has been unveiled ahead of its public debut at the 2011 Frankfurt Motor Show. This concept car – which features an aluminium space frame, wing doors and free-standing wheels – has the dynamic performance of a sports car, yet travels silently, and with zero emissions.
The NILS project is supported by the German Federal Ministry of Transport, Building and Urban Development, and is designed to be both technically realistic and economically supportable.
‘NILS anticipates the future. The goal of the NILS project is to research a technically realistic and economically feasible concept for a minimalist commuter vehicle that makes individual transportation more efficient and eco-friendly thanks to its electric drive,’ said Prof. Dr. Jürgen Leohold, Head of Volkswagen Group Research.
Commenting from the strategic perspective is Dr. Rudolf Krebs, Group Chief Officer for Electric Traction: ‘In terms of the Volkswagen Group’s roadmap for electric mobility, these forward-thinking vehicle concepts play an especially important role. That is because the breakthrough of electric mobility will lead to new vehicle requirements – many of which are oriented towards very specific target groups. In advancing electric mobility to high-volume production, it is not enough to simply electrify existing vehicle models.
With a range of 65 kilometres (40 miles) and a top speed of 130 km/h (80 mph) Volkswagen NILS would be the ideal vehicle for the majority of commuters in Germany. According to the German Bureau of Statistics, 73.9 per cent of all commuters residing between Berlin and Munich cover less than 25 kilometres (15.5 miles) on their way to work.
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