| Volkswagens Turbocharged Direct Injection (TDI) | | | | the internal development of the engine and the |
| is said to be the leader in diesel revolution. TDI | | | | use of new emission post-treatment technology |
| engine makes use of the Pumpe Dse system | | | | giving them a result of up to 90% less nitrogen |
| which makes it incredibly efficient. Pumpe Dse | | | | oxide emissions (NOx). |
| which means pump injector have solved the | | | | This result was necessary to comply with the |
| problem of lost pressure through fuel pipes. The | | | | Tier 2/Bin 5 norm which applies to California and |
| injector and pump are integrated in a single | | | | four other states in the north-east of America |
| Pumpe Dse unit. Each of the cylinders has its own | | | | namely Massachusetts, New York, Vermont and |
| Pumpe Dse unit placed on the cylinder head and | | | | Maine. The average Nox emissions allowed is 70 |
| operated by the camshaft, injecting fuel directly | | | | mg per mile and in order to comply with the said |
| into the combustion chamber at pressures ranging | | | | standard Volkswagen has developed an entirely |
| up to 30,000psi. | | | | new emission treatment technology. |
| The high pressures produce is perfect for | | | | Volkswagen has developed two new systems |
| efficiently blending of the fuel/air mix, controlling | | | | connected to the oxidation catalytic converter and |
| fuel quantities and injection timings. Such clever | | | | the particle filter in the exhaust system. At |
| technology enables TDI to offer the benefits its | | | | present new NOx reservoir catalytic converter |
| famous for such as: good fuel economy, reduced | | | | technology is being tested for models below the |
| exhaust emissions, and increased performance | | | | Passat class. Nitrogen oxide is effectively |
| with more torque than the traditional injection | | | | absorbed like sponge which leads to a high level of |
| systems. | | | | efficiency. In terms of the particle filter, the |
| Volkswagen didnt stop with the TDI technology; it | | | | system has a self-cleaning system. How? The |
| has continuously developed and improved it until it | | | | engine management system changes operation |
| has finally come up with the cleanest ever TDI | | | | modes for a few seconds. |
| engine. Initial test drives of the high potential | | | | For larger and heavier vehicles a Selective |
| Volkswagen technologies demonstrate a | | | | Catalytic Reduction (SCR) catalytic converter is |
| remarkable reduction in the emission of nitrogen | | | | employed. The central element of the SCR is an |
| oxide. | | | | aqueous solution such as the AdBlue which is |
| VWs Jetta with a new 2.0 Liter common rail diesel | | | | transported in an additional tank made from |
| engine with a nitrogen oxide reservoir catalytic | | | | stainless steel or plastic. The solution contains |
| converter which complies to the Californian | | | | 32.5% urea which is continuously injected into the |
| emission standard Tier 2/Bin 5 was used during | | | | exhaust system in front of the SCR catalytic |
| the test. The Tier2/Bin 5 are considered to have | | | | converter using a metering valve. |
| the strictest requirements worldwide. The first | | | | AdBlue solution is a non-toxic, odorless and |
| production run of the Clean TDI with nitrogen | | | | biodegradable. Volkswagen intends to install the |
| oxide post treatment will be made by 2008 in the | | | | additional tank so that the car can be driven |
| US. | | | | without needing maintenance between services. |
| The main objective of the entire Clean TDI | | | | VW is the diesel pioneer in the US and |
| concept is to reduce nitrogen oxide. Volkswagens | | | | approximately more than 800,000 diesel cars |
| engineers in Wolfsburg reached this goal through | | | | from Volkswagen have already been sold. |