A detection method of egr gas temperature and egr cooler cooling efficiency

Abstract

The invention relates to the technical field of engine performance detection, and discloses a method for detecting EGR gas temperature, which includes building an EGR gas temperature detection platform on an engine stand, measuring universal characteristic data of EGR gas temperature, and drawing universal characteristic curves, respectively Obtain the engine speed and hourly fuel consumption corresponding to the highest and lowest EGR gas temperature points, and then run the whole vehicle on the hub to restore the engine operating conditions corresponding to the highest and lowest EGR gas temperature points, and detect the corresponding working conditions on the hub EGR gas temperature under the condition. The temperature obtained at this time is the EGR temperature under the boundary conditions of the vehicle operation, which is close to the actual temperature value and has a stronger reference. The present invention also provides a method for detecting the cooling efficiency of the EGR cooler, using the above method to measure the exhaust gas temperature at the inlet and outlet of the EGR cooler and the temperature of the coolant at the inlet and outlet under any working conditions on the rotating hub, and then According to the efficiency formula of the heat exchanger, the working efficiency of the EGR cooler is accurately calculated.

Description

technical field [0001] The invention relates to the technical field of engine performance detection, in particular to a detection method for EGR gas temperature and cooling efficiency of an EGR cooler. Background technique [0002] EGR (Exhaust Gas Recirculation, Exhaust Gas Recirculation) technology is a technology commonly used in engines at present, mainly used to reduce NO X emissions to meet increasingly stringent emissions regulations. Because the temperature of the exhaust gas is too high, it is usually necessary to cool the exhaust gas before introducing it into the intake side. The control and monitoring of the EGR gas temperature before and after cooling is very important. If the EGR gas temperature is too high, the charging efficiency will decrease and the EGR valve will be burned. stagnation and decrease in cooling capacity of the EGR cooler. [0003] At present, the EGR gas temperature measurement method commonly used in the internal combustion engine industr...

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Problems solved by technology

[0004] However, the engine is to be assembled on the whole vehicle for work, and the environment of the engine stand is quite different from that of the engine compartment of the whole vehicle, especially the cooling water circulation on the engine stand is very different from that of the whole vehicle. There are also large differences in the benches, which will directly affect the cooling capacity of the EGR cooler, and then affect the detection of the EGR gas temperature

Therefore, the measurement of the EGR gas temperature on the engine bench cannot truly reflect the EGR gas temperature when the vehicle is running, and it is easy to misjudge the cooling capacity of the EGR cooler

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