EGR valve temperature field test method

Abstract

The invention discloses an EGR valve temperature field test method, which comprises the following steps: S1, carrying out preparation before test, wherein whether the use environment of an EGR valve is worse than that of batch-produced EGR valves is evaluated, wherein the evaluation method comprises the following steps: collecting the inlet temperature of the EGR valve, the EGR valve environment temperature and the EGR rate, and a step S2 is performed when one evaluation index is higher than a factory set index value of the valve; S2, arranging eight thermocouples in the temperature field of the EGR valve to serve as measuring points; S3, fully heating the engine; S4, operating four working conditions; and S5, carrying out modeling and result analysis: S51, modeling by using CFD analysis software, and setting the ambient temperature as the highest temperature around the EGR valve measured by TASE, S52, setting the highest temperature resistance requirement of each sub-part as an alarm red point, and S53, inputting the highest temperature working condition of each measuring point of the EGR valve into the CFD grid model, and calculating whether each temperature of each sub-part of the EGR valve is overheated or not. According to the invention, the temperature of each sub-part is analyzed through actual CAE according to the temperature field data of the eight points, and the temperature resistance requirement of each sub-part is met.

Description

technical field [0001] The invention relates to the technical field of automobiles, and in particular discloses a method for testing the temperature field of an EGR valve. Background technique [0002] At present, EGR (exhaust gas recirculation) is the main configuration of the engine to reduce NOX in the current National VI diesel engine. The EGRMAP and EGR rate are getting larger and larger. Overheating of the EGR valve hardware will cause the EGR valve current protection to fail and burn the motor, and the EGR valve torque Heat attenuation, chip damage position opening can not be fed back, EGR valve axial sealing ring deformation due to heat, resulting in EGR valve stuck failure, OBD fault light is on, engine torque limit problem, the consequences of failure are very serious; [0003] This inventive test method expounds the particularity of the EGR valve thermocouple layout position and the test environment and working conditions to accurately measure the temperature fiel...

AI Technical Summary

Problems solved by technology

[0002] At present, EGR (exhaust gas recirculation) is the main configuration of the engine to reduce NOX in the current National VI diesel engine. The EGRMAP and EGR rate are getting larger and larger. Overheating of the EGR valve hardware will cause the EGR valve current protection to fail and burn the motor, and the EGR valve torque Heat attenuation, chip damage position opening can not be fed back, EGR valve axial sealing ring deformation due to heat, resulting in EGR valve stuck failure, OBD fault light is on, engine torque limit problem, the consequences of failure are very serious;

Images