Audi boasted of this form have a range of models, Clean Diesel, aparcándolos in front of the capitol. Will go down in the annals of History as a big FAIL
The Volkswagen Group “raided” the north american market with two Diesel engines, the 2.0 TDI and the 3.0 V6 TDI, both under the name “Clean Diesel”. For the first time in many years, their engines complied with the regulations anti-pollution of the 50 U.S. states, including California, with the rules more harsh.
on September 18, the EPA issued a notice of violation (NOV) that only affected the four-cylinder engines, a 140 or 150 HP, which were used for the sedans and compact models. Today has issued a second NOV, which affects the six-cylinder engine, that in all cases with selective catalytic reduction (SCR).
The EPA has indicated directly to the following models:
- 2014 Volkswagen Touareg 3.0 V6 TDI
- 2015 Porsche Cayenne Diesel
- 2016 Audi A6 TDI quattro
- 2016 Audi A7 TDI quattro
- 2016 Audi A8/A8L TDI quattro
- 2016 Audi Q5 TDI quattro
Until the time, Porsche had come out unscathed from the scandal, but the diesel engine is from Audi, and inherits the same problem
what is the fraud?
Again we are faced with a defeat device, that is to say, a programming of the engine control unit that is capable of detecting when the vehicle is being subjected to an emissions test, specifically the test cycle FTP 75 EPA. emissions of oxides of nitrogen (NOx) remain within the legal limits only under these conditions.
The limit american is 43.6 mg/km of NOx, almost half of the limit of Euro 6 (80 mg/km). Well, when the cars are in the “normal” mode, the emissions shoot up to almost 400 mg/km. In Europe the “Clean Diesel” would be within the limits of Euro 3 (500 mg/km), but the standard Euro 4 no longer be fulfilled; obviously, neither fulfil the Euro 5, not Euro 6.
programming, interestingly enough, it jumps to normal mode just a second after passing the cycle, FTP-75, as if it had hurry to contaminate. On the other hand, all the models mentioned have all-wheel drive, so that they can not force you to use the mode of approval, leaving the rear wheels stops. This trick is used to check the limitations of benefits in the way of approval with the 2.0 TDI.
In the conditions of the test, the catalyst for NOx, named Lean NOx Trap (LNT), works at a higher temperature. The ecu modifies the injection times of the fuel oil, the pressure of the rail system common and the recirculation of hot gases by the EGR valve. In consequence, the exhaust gases come out more hot, and the catalyst NOx is more effective.
This catalyst reduces the NOx in the gas more safe with some metals, concrete, works on the basis of heat, the metals are not consumed. the more the temperature of exhaust you have, the more effective is the process. Hence the importance of this catalyst to warm up fast in the early miles.
The 3.0 TDI Clean Diesel have selective catalytic reduction (SCR) also, that is to say, they inject urea into the last section of the exhaust to neutralize the remaining NOx that has not been loaded the catalyst above. The EPA does not say that this system is turned off or that reduces its effectiveness, although the 2.0 TDI is proved to be well spent.
Not spent all the urea that it had to spend, more NOx coming out of the breadsticks exhaust.Why was that? To make sure that the client is not left without additive before getting to the next official revision, which is filled in the AdBlue in a tank.
coming up, more curves for Volkswagen
The federal regulation contemplates fines of up to 37.500 dollars per car, and are going to join a few thousand of the 482.000 tetracilíndricos affected by the scandal. Only counting engines 2.0 TDI, the maximum penalty reaches 18,000 million dollars. Fortunately for VAG, they have not sold many TDI six-cylinder, or things would get really ugly.
If the Clean Diesel americans have the defeat device, what is more certain is that the european market pass the same. In a matter of hours VAG should remove from sale or service all of these models to the hopes of a modification of the ecu, because if they do not meet the american standard with so much excess, the european either.
unlike the U.S., the affected models in the EU have been sold primarily with Diesel engines, although high-end models. If the accounts of the #Dieselgate were going for about 10.5 million cars with engines 1.2 TDI, 1.6 TDI and 2.0 TDI, it is now added to the party other thousands with the 3.0 TDI. At the time of closing this information there is no press release from the company in response to the NOV.