Yongxin mainly studies the effect of carbon canister L/D, depth of absorptive pipe, 3 position and vapor velocity on performance, and utilizes patent innovation structure (National Patent No: ZL20062 0101951.9) to enhance its adsorption capacity by change the trend of fuel steam; it is detected by national institutions that the product working ability is in leading place at home, and is listed as national torch project. The product has passed environmental protection authentication of national environmental protection industry association.