M-B on kehityksessä edellä

Laatu maksaa. Noi mainitsemasi kiinalaiset kopioautot on tietysti halpoja.

Mistä kohtaa IS 220d on urheiluauto? Ei ainakaan suorituskyvyn mukaan! Mopooooo...

Silti diesel kuluttaa vähemmän, ei tarvii tankata jatkuvasti.

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Jymppä kirjoitti:

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Mutta silti Toyota saavutti samat päästörajat jo 2005 ja ainakin periaatteessa yksinkertaisemmalla tekniikalla. Kohtuullisen kunnioitettava suoritus ja hyvä esimerkki siitä, että japanilaisetkin osaavat diesel-tekniikkaa.

Jymppä kirjoitti:

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Kannattaisi tutustua, mikä on ammoniakin ja urean ero. Se on varma, että myös MB:n henkilöautodieselin pakokaasut haisevat kuselle ihan kuten kuorma-autojenkin. BlueTec tekniikkahan noissa on sama.

"NAC SCR
Exhaust leaves the engine and passes through a Diesel Oxidation Catalyst (DOC), which reduces carbon monoxide and unburned hydrocarbons in the exhaust. Next is the NOx Absorber Catalyst, or NAC, which removes and traps oxides of nitrogen (NOx is one of the chief elements in diesel pollution). During periods of lean operation (low fuel-to-air ratio) NOx is stored; under richer operating conditions (which can be created by manipulating the fuel injection) the NAC undergoes a regeneration process and releases ammonia into the exhaust. The ammonia is stored downstream in the Selective Catalytic Reduction (SCR) catalyst which uses it to further reduce NOx.
In between the NAC and SCR catalysts is a particulate filter that traps particulate emissions (soot). As the particulate filter becomes full, the engine computer manipulates the fuel injection process to raise the exhaust gas temperature, which in turn burns off the particulates.


ADBLUE
The AdBlue system houses the DOC and particulate filter in a single housing. In addition to the NAC catalyst, ammonia is supplied by injecting a fluid called AdBlue into the exhaust upstream of the SCR catalyst. The addition of AdBlue fluid enables the SCR catalyst to reduce NOx emissions to a level even lower than the NAC-SCR system. AdBlue is carried in an on-board tank which can be replenished when the car is serviced; a gallon of AdBlue fluid lasts approximately 2,400 miles."