Streamlined valve core of electric EGR valve

Abstract

The invention discloses a streamlined valve core of an electric EGR valve. The streamlined valve core of the electric EGR valve comprises a straight part located in a waste gas cavity of the electric EGR valve and an elliptical part connected in an air inlet port of the waste gas cavity in a penetrating manner. The top end of the elliptical part is connected with the edge of the straight part in a transition manner and the bottom end of an electric EGR valve center rod is fixedly connected with the center of the straight part. The valve core is strong in waste gas impact resistance, low in improving cost and capable of greatly reducing the dependency on the motor torque and meeting the usage requirements of a diesel engine, which is high in emission class, in various working conditions.

Description

technical field [0001] The invention relates to the technical field of engine exhaust emission control, in particular to a valve core of an electric EGR valve in an engine exhaust exhaust gas recirculation system. Background technique [0002] In the engine exhaust gas recirculation system (EGR system), the EGR valve is mainly used to adjust and control the flow of recirculated exhaust gas. The EGR valve adjusts the flow of exhaust gas by controlling the opening, so that the exhaust gas and fresh air are mixed in a certain proportion and then returned to the cylinder for recirculation. cycle to reduce the combustion temperature and combustion velocity of the gas in the cylinder, further reducing NO X emissions. [0003] The current road engine EGR system all introduces the exhaust gas from before the turbocharger to the intake manifold after the supercharging and intercooling through the cooler. Under the increasingly stringent emission regulations, in order to further re...

AI Technical Summary

Problems solved by technology

The pressure difference between the two ends of the EGR valve becomes larger, and the flow of exhaust gas increases, which leads to an increase in the impact force of the exhaust gas on the valve core. However, the traditional electric EGR valve core has a thin-plate structure, and the motor and gearbox of the electric EGR valve cannot provide sufficient feedback. To ensure the stable opening of the EGR valve, it is necessary to redesign the EGR valve drive mechanism or the valve core if the impact force on the EGR valve core is to be reduced.

However, changing the driving mechanism not only requires changing the shape of the EGR valve, the strength of the gearbox, etc., but also needs to adjust the EGR current output circuit of the controller, which requires a lot of work, complicated work, and high cost.

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