BYD Auto is a Chinese manufacturer.
BYD Auto Co. , Ltd. is a Chinese automobile manufacturer based in Xi'an , Shaanxi Province , and a wholly owned subsidiary of BYD Company . BYD Auto sold a total of 506,189 passenger cars in China in 2013 , making it the tenth-largest selling brand and the largest selling Chinese brand . Xi'an ( [ - cmnAUDZh-Xi ` an.oggxi1.an1 ] ) , formerly romanized as Sian , and also known as Chang ` an '' ' ( [ - cmnAUDZh-Changan .