Novel EGR cooler

Abstract

The invention discloses a novel EGR cooler. The novel EGR cooler comprises an EGR cooler component, an electric EGR valve module, a temperature feedback component and a coolant flow adjusting component, wherein the EGR cooler component comprises an EGR cooler body, and the EGR cooler body comprises a water inlet pipe, a water outlet pipe, a waste gas inlet and a waste gas outlet. According to the novel EGR cooler, a flow control water valve is arranged before cooling liquid of the EGR cooler body enters, meanwhile, a temperature sensor is arranged on a valve seat, and waste gas temperature data signals are fed back to an engine ECU in time, so that the flow of the flow control water valve is controlled according to the waste gas temperature, and the flow control precision is high; the temperature of cooled waste gas is controlled within a relatively constant area range, formation of carbon deposition and coking can be effectively degraded, and the use durability and reliability of the EGR valve module and the EGR cooler component are improved; and continuous adjustment and optimization can be achieved at different working condition points by adjusting the temperature controlled by the engine ECU.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a novel EGR cooler. Background technique [0002] The principle of the exhaust gas recirculation system is to mix a part of the high-temperature exhaust gas discharged from the engine with the fresh air filtered by the air after cooling, and then introduce it into the intake system for re-combustion, so as to improve the combustion performance and reduce the generation of NOx and waste in the engine exhaust gas. Emission is the most commonly used technical line for light-duty engines in China VI, but the EGR valve and cooler failure frequency is too high, which is also a relatively common problem at present. In order to improve the above situation, a flow control water valve can be added in front of the EGR cooler. Improve the overall performance and reliability of the EGR module. [0003] The EGR cooler is a very important part of the engine aftertreatment system. Th...

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Problems solved by technology

[0002] The principle of the exhaust gas recirculation system is to mix a part of the high-temperature exhaust gas discharged from the engine with the fresh air filtered by the air after cooling, and then introduce it into the intake system for re-combustion, so as to improve the combustion performance and reduce the generation of NOx and waste in the engine exhaust gas. Emission is the most commonly used technical line for light-duty engines in China VI, but the EGR valve and cooler failure frequency is too high, which is also a relatively common problem at present. In order to improve the above situation, a flow control water valve can be added in front of the EGR cooler. Improve the overall performance and reliability of the EGR module

[0003] The EGR cooler is a very important part of the engine aftertreatment system. The design and development is based on the engine exhaust temperature requirements at rated speed and rated torque as the design input. However, in the actual use of the vehicle, due to different loads and road conditions, etc., There will be a variety of working conditions in the low-speed and low-load area. Since the EGR cooler is a structure with linear physical characteristics, if the temperature after rated cooling is low, the temperature in the low-speed and low-load area will be lower, and it is very easy for the cooler and EGR valve to appear. Carbon deposition and coking problems, which affect the engine emissions and the stability of the entire after-treatment system

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