Is the p 1+p3 hybrid in Changan a patent of BYD?

The P 1+P3 hybrid technology of No.1 Changan Automobile is independently developed, and adopts the independently developed electronic control system of electric control, electric drive, battery and electric drive. Although Changan and BYD belong to the automobile industry in China, they both have their own technologies and patents. Therefore, Changan's P 1+P3 hybrid technology is not BYD's patent.