A device and method for improving the uniformity of each cylinder of exhaust gas recirculation of a gasoline engine

Abstract

The invention discloses a device and method for improving uniformity of each cylinder in gasoline engine exhaust gas recirculation. The device comprises an intake manifold and a gasoline engine throttle valve body connected with the intake manifold, and further comprises a gas mixing device, wherein one end of the gas mixing device is connected with the intake manifold, and the other end of the gas mixing device is connected with the gasoline engine throttle valve body. The method for improving the uniformity of each cylinder in the gasoline engine exhaust gas recirculation is achieved through the device for improving the uniformity of each cylinder in the gasoline engine exhaust gas recirculation. According to the device and the method, the independent gas mixing device is adopted, the gas mixing device is respectively connected with the gasoline engine throttle valve body and the intake manifold, vortexes behind a throttle valve of the gasoline engine throttle valve body is sufficiently utilized to increase mixing capacity, exhaust waste recirculation gas mixing uniformity is greatly improved, power performance of an engine is improved, and the average EGR relative error of each cylinder is controlled to be within 3.5%; meanwhile light-weight production requirements for gasoline engines can be met.

Description

technical field [0001] The invention relates to a device and a method for improving the uniformity of each cylinder of exhaust gas recirculation of a gasoline engine. Background technique [0002] Exhaust gas recirculation (EGR) can reduce emissions and improve fuel consumption, and it is gradually applied in gasoline engines. In the early days, EGR gas was simply introduced into the intake manifold behind the throttle body. In practice, it was found that this direct EGR introduction method made the EGR of each cylinder have large differences and poor uniformity, resulting in little improvement in fuel consumption and emissions. [0003] The Chinese patent document with the announcement number CN101949343B discloses an intake manifold and its manufacturing method, and the Chinese patent document with the announcement number CN201747482U discloses an air mixing structure in an exhaust gas recirculation system. Both patent documents are The EGR gas is distributed into the bra...

AI Technical Summary

Problems solved by technology

However, since the extension pipe is arranged in the intake manifold, the flow area of ​​the intake manifold is reduced, and the airflow bypassing the extension pipe will generate vortex, which will increase the flow resistance, which will greatly reduce the engine power performance

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