egr check valve and internal combustion engine and automobile using the valve

Abstract

The invention relates to an EGR stop value, and an internal combustion engine and an automobile using the same. The EGR stop value includes a hollow casing, a separator plate is arranged in the casing to separate the inner cavity of the casing into two cavities, a through hole communicating the two cavities is arranged in the separator plate, a valve core can freely arranged in one of the cavities in a sliding fit manner, the valve core and the adjacent wall surface of the cavity are in sealing cooperation, at least one annular groove is arranged in the side wall, adjacent to the cavity, of the valve core, and the outer side wall of the cavity is provided with an intake branch pipe and a first guiding branch pipe which are communicated with the cavity, The annular groove is adapted to communicate the intake branch pipe and the first guiding branch pipe when the valve core slides to a desired position, the side wall of the other cavity is provided with a second guiding branch pipe which is communicated with the cavity, the valve core and the casing are elastically connected, and the first and second guiding branch pipes are adapted to communicate with the exhaust pipe of the internal combustion engine. The EGR stop value is stable and reliable in work, and overcomes the valve sealing problem caused by the deposition of the carbon particles in the exhaust gas.

Description

technical field [0001] The invention relates to an EGR check valve and an internal combustion engine and an automobile using the valve, which can improve the working stability of the EGR system. Background technique [0002] The internal combustion engine system usually includes an exhaust gas recirculation or exhaust gas recirculation (EGR) system to reduce the content of nitrogen oxides in the exhaust gas of the internal combustion engine. When the internal combustion engine is working under a set load condition, the EGR valve in the EGR system is opened or partially opened to discharge The passage between the air pipe and the intake pipe allows part of the exhaust gas to enter the cylinder together with the outside air through the intake pipe to participate in combustion, slowing down the combustion speed and reducing the pressure in the cylinder after combustion, thereby reducing the amount of nitrogen oxides produced. [0003] In order to improve the control accuracy of...

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Problems solved by technology

[0003] In order to improve the control accuracy of the existing EGR valve, the internal combustion engine computer (ECU) is generally used to collect the signal of the EGR valve position sensor and control the rotation of the motor on the EGR valve. The opening and closing of the valve is driven by the motor. Closed state signal, ECU calculates control parameters, ECU transmits control signal to the motor, and the motor drives the valve to open and close. Although the whole process can be completed quickly, there is still a certain time delay, which cannot adapt to the changing workload of the internal combustion engine; at the same time, the motor and The EGR valve position sensor is generally installed on one side of the EGR valve. Since the exhaust gas of high temperature and high pressure passes through the EGR valve, the working temperature of the EGR valve is above 300 degrees Celsius. The motor and sensor are easily damaged if they work in this temperature environment for a long time. When the exhaust gas passes through the EGR valve, it will vibrate, which will have a destructive effect on the above sensor and motor, making them easy to damage

[0004] The Chinese Patent Document No. CN104373254A discloses a non-road internal combustion engine EGR valve, which controls the valve opening and closing of the EGR valve through the boost pressure in the intake manifold. This purely mechanical control mechanism overcomes the The disadvantage of the above-mentioned electronically controlled EGR valve, however, the sealing fit between the valve core and the valve seat will fail due to the deposition of carbon particles in the exhaust gas on the sealing surface

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