German premium brand will be adding diesel offerings to the Q5 SUV, A6 and A8 models. The next-generation A4 will also be offered with a diesel in the United States by 2015.

Audi wants to introduced diesel variants into most of its U.S. model lineup by 2015.

Audi of America currently sells just two diesel models in that market - the A3 TDI and the Q7 TDI. But both variants are very popular with consumers and Audi can't keep up with demand. About 50 percent of A3s sold in the U.S. are the diesel variant and the number is close to 40 percent for the Q7 - similar to the proportion of diesel variants for any given model that are sold in Europe.

"Dealers are telling us that there is significant consumer demand [for diesels]," said Audi spokesman Jeff Kuhlman.

The U.S. arm of the German brand says it also needs to add diesels to its product lineup in North America to keep up with ever more stringent emission regulations. Audi says it will be adding diesel variants to the current Q5 compact SUV, the A6 and the A8 sedan. By 2015, it will add a 4-cylinder diesel, likely the 2.0 TDI, to the next-generation A4 model.

Audi is also considering adding a V6 diesel to the A4 but cost may be an issue since it may make the model too expensive for U.S. consumer tastes.

Johan de Nysschen, president of Audi of America, said in the Automotive News story that the automaker would like to have 20 percent of its U.S. sales be diesel variants by 2015.

The growth in U.S. diesel sales, Audi hopes, will be part of a growth in American sales overall, as the Ingolstadt-based automaker hopes to double its annual sales in the United States to 200,000 units by 2015.

Gallery: Audi wants diesel option in most of its U.S. lineup by 2015