Group 1 - Harbin Dong'an Automobile Engine Manufacturing Co., Ltd. and Harbin Dong'an Automobile Power Co., Ltd. have applied for a patent titled "A Method for Verifying the Reliability of VVT Follow-up in Automobile Engines" with publication number CN120800808A, filed on June 2025 [1] - The patent describes a method for verifying the reliability of the VVT system in automobile engines, which includes warming up the engine to oil and water temperatures above 90°C, idling at 0% load, accelerating to 20% load at 3000 r/min, and further to 100% load at 5500 r/min, among other steps [1] - The method aims to simulate the dynamic working conditions throughout the engine's lifecycle, effectively addressing the limitations of existing technologies that only allow for static calibration or single working point verification [1] Group 2 - Harbin Dong'an Automobile Engine Manufacturing Co., Ltd. was established in 1998, located in Harbin, with a registered capital of 500 million RMB, and has participated in 3681 bidding projects [2] - Harbin Dong'an Automobile Power Co., Ltd. was also founded in 1998 in Harbin, with a registered capital of approximately 475.78 million RMB, and has made investments in 5 companies while participating in 2554 bidding projects [2] - The engine manufacturing company holds 889 patents and 1 trademark, while the power company has 1140 patents and 9 trademarks, along with various administrative licenses [2]