rA new Xpeng P7 car is shown in the Xpeng Motors flagship store in a shopping mall. Xpeng P7 is one of the two popular models of Xpeng motors.Zhang Peng | LightRocket | Getty ImagesGUANGZHOU, China u2014 Chinese electric car start-up Xpeng released updates for its semi-autonomous driving system as its looks to up its challenge to Tesla in China.Xpeng released XPILOT 3.5, the latest version of its advanced driver-assistanceu00a0system, or ADAS. This refers to a driving software system with some autonomous features but where a driver is still required.With XPILOT 3.5, the company will be launching a feature called...