2results about How to "Increase EGR rate" patented technology

The present application discloses an exhaust gas recirculation system and control method including an air compressor and a variable-section turbine, and relates to the field of exhaust gas recirculation technology. The exhaust gas recirculation system includes an EGR control module, an exhaust gas circulation branch and an air compressor branch; the exhaust gas circulation branch includes an EGR cooler, an EGR valve and a first non-return valve in sequence along the airflow direction; the air compressor branch includes an air compressor and a second non-return valve in sequence along the airflow direction, and the air compressor branch is arranged on both sides of the first non-return valve; the exhaust gas turbine adopts a variable-section turbine, and the EGR control module, the variable-section turbine and the EGR valve are connected to the vehicle-mounted ECU; the EGR control module adjusts the switch state of the EGR valve and the opening of the variable-section turbine through the vehicle-mounted ECU. The exhaust gas recirculation system and control method of the present application improve the EGR rate through the air compressor branch and the variable-section turbine to solve the problem of a low EGR rate in the traditional exhaust gas recirculation system.

This application discloses an EGR one-way valve and an EGR system. The EGR one-way valve includes a base and a valve plate. A rotating shaft is provided at the fixed end of the valve plate, and a bushing is provided on the base. The valve plate is rotatably connected to the base through the bushing that cooperates with the rotating shaft. The opening of the valve plate of the EGR one-way valve disclosed in this solution is affected by the friction between the rotating shaft and the bushing. The friction between the rotating shaft and the bushing is much smaller than the restoring force generated by the deformation of the valve plate in related technologies, which reduces the opening resistance of the valve plate and increases the opening angle of the valve plate, thereby reducing the exhaust gas resistance and helping to improve the engine EGR rate. By changing the fixing method of the valve plate, the valve plate does not deform during the opening process, and the valve plate does not block the opening area, increasing the opening area at the same opening angle. At the same time, the valve plate does not deform, reducing the risk of the valve plate breaking due to frequent opening and closing, and extending the service life of the valve plate.