Cold flow test device and hot state back pressure estimation method for exhaust system back pressure test
A technology of exhaust system and cold flow test, which is applied in the direction of internal combustion engine test, etc., can solve the problems such as back pressure data is difficult to obtain, and achieve the effect of low equipment cost, simple operation, and not easy to be restricted by objective conditions
Active Publication Date: 2017-07-07
AUTOMOBILE RES INST OF TSINGHUA UNIV IN SUZHOU XIANGCHENG
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Problems solved by technology
It makes it difficult to obtain back pressure data in the early stage, and the exhaust acoustic matching must be designed on the premise of back pressure requirements
Method used
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[0034] The technical solutions of the present invention will be further elaborated below with reference to the accompanying drawings and specific embodiments.
[0035] see figure 1 The cold flow test device for the back pressure test of the exhaust system shown, including the air source device 1, the cooling device 2, the valve device 3, the test feedback device and the control device 4, the air source device 1, the cooling device 2 and the valve device 3 pass through The pipelines are connected in sequence, and the air source device 1, the cooling device 2 and the valve device 3 are respectively connected with the control device 4, and the valve device 3 is connected with the sample to be tested.
[0036] The air source device 1 is used to generate airflow. In this embodiment, the air source device 1 adopts a Roots blower.
[0037] The cooling device 2 is used to cool the airflow generated by the Roots blower. In this embodiment, the cooling device adopts a water circulation...
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The invention discloses a cold flow test device for back pressure testing of an exhaust system and a hot state back pressure estimation method, wherein the test device includes an air source device for generating air flow, and is used for performing a test on the air flow generated by the air source device. A cooling device for cooling, a valve device for fitting the exhaust valve of a four-cylinder engine, a test feedback device and a control device, the air source device, the cooling device and the valve device are connected in sequence through pipelines, and the gas The source device, the cooling device and the valve device are respectively connected with the control device, and the valve device communicates with the sample to be tested. The cold flow test device for the exhaust system back pressure test can predict the back pressure of the exhaust system in the laboratory, and the equipment cost is low, the operation is simple, and it is not easily restricted by external objective conditions; at the same time, according to the cold flow state The test data estimates the back pressure of the bench, making the cold flow test data more in line with the actual back pressure data of the engine.
Description
technical field [0001] The invention relates to the technical field of automotive NVH, in particular to a cold flow test device for back pressure testing of an exhaust system and a hot state back pressure estimation method. Background technique [0002] Exhaust back pressure as a key indicator directly affects the power loss of the engine in the matching development process of the automobile exhaust system, and the back pressure is positively correlated with the engine power loss. The OEM will clearly specify the exhaust back pressure requirements to control engine power loss. However, there is a negative correlation between exhaust back pressure and tailpipe noise. Any changes in the muffler structure in the acoustic matching of the exhaust system may cause the exhaust back pressure to increase or even exceed the standard. Therefore, the optimization of each round of acoustic matching must be based on the exhaust back pressure meeting the requirements, that is, each round ...
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IPC IPC(8): G01M15/10
Inventor 柳仲达郑四发韩强齐松明
Owner AUTOMOBILE RES INST OF TSINGHUA UNIV IN SUZHOU XIANGCHENG