| Volkswagen’s Turbocharged Direct Injection (TDI) | | | | emission post-treatment technology giving them a |
| is said to be the leader in diesel revolution. TDI engine | | | | result of up to 90% less nitrogen oxide emissions |
| makes use of the Pumpe Düse system which | | | | (NOx). |
| makes it incredibly efficient. Pumpe Düse which | | | | This result was necessary to comply with the Tier 2 |
| means ‘pump injector’ have solved the problem | | | | Bin 5 norm which applies to California and four other |
| of lost pressure through fuel pipes. The injector and | | | | states in the north-east of America namely |
| pump are integrated in a single Pumpe Düse unit. | | | | Massachusetts, New York, Vermont and Maine. The |
| Each of the cylinders has its own Pumpe Düse unit | | | | average Nox emissions allowed is 70 mg per mile and |
| placed on the cylinder head and operated by the | | | | in order to comply with the said standard Volkswagen |
| camshaft, injecting fuel directly into the combustion | | | | has developed an entirely new emission treatment |
| chamber at pressures ranging up to 30,000psi. | | | | technology. |
| The high pressures produce is perfect for efficiently | | | | Volkswagen has developed two new systems |
| blending of the fuel/air mix, controlling fuel quantities and | | | | connected to the oxidation catalytic converter and the |
| injection timings. Such clever technology enables TDI to | | | | particle filter in the exhaust system. At present new |
| offer the benefits it’s famous for such as: good | | | | NOx reservoir catalytic converter technology is being |
| fuel economy, reduced exhaust emissions, and | | | | tested for models below the Passat class. Nitrogen |
| increased performance with more torque than the | | | | oxide is effectively absorbed like sponge which leads |
| traditional injection systems. | | | | to a high level of efficiency. In terms of the particle |
| Volkswagen didn’t stop with the TDI technology; it | | | | filter, the system has a self-cleaning system. How? |
| has continuously developed and improved it until it has | | | | The engine management system changes operation |
| finally come up with the cleanest ever TDI engine. Initial | | | | modes for a few seconds. |
| test drives of the high potential Volkswagen | | | | For larger and heavier vehicles a Selective Catalytic |
| technologies demonstrate a remarkable reduction in | | | | Reduction (SCR) catalytic converter is employed. The |
| the emission of nitrogen oxide. | | | | central element of the SCR is an aqueous solution |
| VW’s Jetta with a new 2.0 Liter common rail diesel | | | | such as the AdBlue which is transported in an |
| engine with a nitrogen oxide reservoir catalytic | | | | additional tank made from stainless steel or plastic. The |
| converter which complies to the Californian emission | | | | solution contains 32.5% urea which is continuously |
| standard ‘Tier 2/Bin 5’ was used during the test. | | | | injected into the exhaust system in front of the SCR |
| The Tier2/Bin 5 are considered to have the strictest | | | | catalytic converter using a metering valve. |
| requirements worldwide. The first production run of the | | | | AdBlue solution is a non-toxic, odorless and |
| ‘Clean TDI’ with nitrogen oxide post treatment | | | | biodegradable. Volkswagen intends to install the |
| will be made by 2008 in the US. | | | | additional tank so that the car can be driven without |
| The main objective of the entire ‘Clean TDI’ | | | | needing maintenance between services. VW is the |
| concept is to reduce nitrogen oxide. Volkswagen’s | | | | diesel pioneer in the US and approximately more than |
| engineers in Wolfsburg reached this goal through the | | | | 800,000 diesel cars from Volkswagen have already |
| internal development of the engine and the use of new | | | | been sold. |