Exhaust backpressure test system

Abstract

The invention discloses an exhaust backpressure test system. The system comprises a transition pipe, a front backpressure test device and a rear backpressure test device. The front backpressure test device is arranged on the transition pipe. The rear backpressure test device is arranged between a three-way catalyst and an exhaust system. A first connecting flange and a second connecting flange are arranged on an upper portion and a lower portion of the transition pipe respectively. The first connecting flange and the second connecting flange have a deflecting angle. The first connecting flange is connected to an engine. The second connecting flange is connected to the three-way catalyst. The transition pipe is provided with an exhaust temperature measurement port and a front backpressure test port. The front backpressure test device is connected to an internal portion of the transition pipe through the front backpressure test port. By using the exhaust backpressure test system, the structure is simple; an exhaust system extension direction is adjusted to a length direction from a width direction of an engine rack laboratory; pipeline arrangement of an area from a three-way catalyst outlet to an exhaust pipe inlet is the same with whole vehicle arrangement; an exhaust airflow is uniform; exhaust backpressure test data is accurate and errors are reduced.

Description

technical field [0001] The invention relates to a pressure test system, in particular to an exhaust back pressure test system used in automobile manufacturing. Background technique [0002] Such as figure 1 As shown, the exhaust system 3 of the transversely mounted and front-drive engine 1 passes through the oil pan of the engine 1, and its extension direction is nearly perpendicular to the axial direction of the engine crankshaft. 5 in parallel; the space of the current engine bench test room is limited, its width direction 4 is short and its length direction 5 is long, due to the limitation of the space of the engine bench test room, it is impossible to follow the layout plan of the whole vehicle when performing the exhaust back pressure test Arrange the parts of the exhaust system; in order to complete the exhaust back pressure test, the extension direction of the exhaust system must be changed to be basically parallel to the axis of the engine crankshaft, so as to utili...

AI Technical Summary

Problems solved by technology

[0002] like figure 1 As shown, the exhaust system 3 of the transversely mounted and front-drive engine 1 passes through the oil pan of the engine 1, and its extension direction is nearly perpendicular to the axial direction of the engine crankshaft, while the axial direction of the engine crankshaft in the engine bench test room is parallel to the longitudinal direction of the test room. 5 in parallel; the space of the current engine bench test room is limited, its width direction 4 is short and its length direction 5 is long, due to the limitation of the space of the engine bench test room, it is impossible to follow the layout plan of the whole vehicle when performing the exhaust back pressure test Arrange the parts of the exhaust system; in order to complete the exhaust back pressure test, the extension direction of the exhaust system must be changed to be basically parallel to the axis of the engine crankshaft, so as to utilize the larger space in the longitudinal direction of the bench test room 5

The technical scheme adopted in the prior art is by reforming the technical scheme of the flange angle of the exhaust pipe and the pipeline, which has the following deficiencies: (1). figure 2 As shown, the layout requirements of the bench test room are realized by changing the direction of the exhaust pipe, which will lead to three-dimensional continuous distortion of the exhaust gas flow in the area between the outlet of the three-way catalytic converter and the inlet of the exhaust pipe inlet, and the air flow is disordered, resulting in The pressure increases sharply; (2), such as image 3 As shown, the transition pipe 6 temporarily modified and the sealing ring 7 commonly used in the bench (not in the design state of the whole vehicle) are used. The flange is a flat flange 1.1 without a sealing ring installation groove, and sealing often occurs due to gravity. Misalignment of the pads, resulting in the appearance of the exhaust gas flow blocking area 9, resulting in an increase in the exhaust back pressure; (4), such as Figure 4 As shown, according to the vehicle layout plan, the front end of the three-way catalytic converter 2 lacks a necessary straight line section, and the exhaust back pressure measuring point 10 and the exhaust temperature measuring point 8 of the current technical solution can only be selected at the inlet of the three-way catalytic converter 2. On the gas end cone 2.1, due to the uneven air flow inside the three-way catalytic converter 2 intake end cone 2.1, the accuracy of the back pressure and exhaust temperature data is reduced

Due to the existence of the above problems, the data of the exhaust back pressure is inaccurate, and it is difficult to judge whether the back pressure of the exhaust system meets the design requirements, causing great trouble to the freezing of the tuning scheme of the exhaust system

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