ALEXANDRIA, Va., Aug. 6 -- United States Patent no. 12,378,734, issued on Aug. 5, was assigned to Hunan Sany Zhongyi Machinery Co. Ltd. (Yiyang, China).
"Control method for road roller machine, and road roller machine" was invented by Hengning Tang (Yiyang, China), Gan Jia (Yiyang, China) and Xiangping Hu (Yiyang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are a control method for a road roller machine, and a road roller machine. The control method includes: turning up, in response to a request of starting vibration, a revolving speed of an engine until the revolving speed exceeds a preset revolving speed range and turning down a displacement of a driving pump; starting a vibration pump; ...