BEIJING — Electric carmakers in China are layering on more of the same artificial intelligence features as they try to survive a prolonged price war in the world's largest auto market. The competition has shifted over the last few years, from extending battery range to rolling out driver-assist systems and using more powerful automotive chips . Now, automakers are focusing on a suite of in-car AI features. More than 50 car brands now use ByteDance's Doubao AI model, the company's cloud platform