TWM612949U - Exhaust device for motorcycle engine - Google Patents

Abstract

The exhaust device of the engine of the creative locomotive includes an exhaust front pipe, a connecting pipe, an upstream oxygen sensor, a catalytic converter assembly, a downstream oxygen sensor, and a muffler. Wherein, the exhaust front pipe has an inlet end and an outlet end, the inlet end is connected with an exhaust end of an engine; the front end of the connecting pipe is connected with the outlet end of the exhaust front pipe, and the upstream oxygen sensor group On the connecting pipe; the catalytic converter assembly has a catalytic converter cylinder and a first catalytic converter arranged in the catalytic converter cylinder, the front end of the catalytic converter assembly and The rear end of the connecting pipe is connected; the downstream oxygen sensor assembly is arranged on the catalytic converter assembly and located behind the first catalytic converter; the muffler has a muffler front cover connected to the cylinder of the catalytic converter And a muffler body. In this way, this creation adds a downstream oxygen sensor behind the first catalytic converter to detect the degree of deterioration of the first catalytic converter, so that it can be known at any time whether the first catalytic converter needs to be replaced, in order to comply with environmental protection. Provisions of emission regulations.

Description

Exhaust device of locomotive engine

This creation is about an exhaust device for an engine, especially an exhaust device suitable for locomotive engines.

At present, the catalytic converter installed in the exhaust device of the four-stroke engine is coated with a catalyst on a metal cylinder. The catalyst contains precious metals such as platinum (Pt) and palladium (Pd). The air pollutants produced by the incomplete combustion of the engine, such as carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas, are oxidized into harmless carbon dioxide (CO2) and water (H2O), and the nitrogen and oxygen in the exhaust gas The compound (NOX) is reduced by the noble metal rhodium (Rh) contained in the catalyst to harmless nitrogen (N2) and oxygen (O2) to purify the air pollutants in the engine exhaust.

In addition, the main purpose of the oxygen sensor (Oxygen Sensor or O2 Sensor) is to control the "air-fuel ratio" of gasoline and oxygen in the engine. The oxygen sensor will automatically detect the oxygen content in the exhaust gas in the exhaust pipe. The content information is sent back to the Engine Control Unit (ECU: Engine Control Unit). More oxygen content means that the air-fuel ratio is too lean, and less oxygen content means that the air-fuel ratio is too rich. If the air-fuel ratio is too lean, the engine control unit will drive more fuel injectors. Inject some oil to enrich the oil and gas. If the air-fuel ratio is too rich, the engine control unit will control the fuel injection nozzle to make it inject less fuel, so that under the rapid operation and control of the engine control unit, one can be adjusted quickly The most appropriate air-fuel ratio allows every drop of oil to play the best efficiency and achieve fuel-saving effects. Therefore, the oxygen sensor can be used to determine whether the exhaust gas in the exhaust pipe is too rich or too lean.

At present, the fuel injection engine of locomotives on the market must be equipped with an oxygen sensor, which is installed on the exhaust front pipe upstream of the catalytic converter to detect the oxygen content of exhaust gas and feed it back to the engine control unit. The ECU uses The fuel injection quantity of the fuel injector is controlled to control the air-fuel ratio of the engine to maintain the most suitable mixing ratio in each operating state.

Please refer to Figure 1 for a schematic diagram of the exhaust device configuration of a conventional locomotive engine. The exhaust device of a conventional locomotive engine includes: an exhaust front pipe 75, a connecting pipe 76, and a catalytic converter assembly connected in sequence 80. A muffler 90 and a tail pipe 93. The exhaust front pipe 75 includes an inlet end 751 and an outlet end 752, and the inlet end 751 is connected to an exhaust end 701 of an engine 70. The front end of the connecting pipe 76 communicates with the outlet end 752 of the exhaust front pipe 75. An oxygen sensor 77 is installed on the exhaust front pipe 75 to detect the change of the oxygen content of the exhaust gas in the exhaust front pipe 75.

As shown in FIG. 1, the catalytic converter assembly 80 includes a catalytic converter cylinder 81, a connecting piece 83, and a first catalytic converter 82 and a first catalytic converter 82 and a second catalytic converter disposed in the catalytic converter cylinder 81. Two catalytic converters 84, the first catalytic converter 82 and the second catalytic converter 84 are connected by the connecting piece 83, the front end of the catalytic converter cylinder 81 is behind the connecting pipe 76端连接。 Connected. The muffler 90 includes a muffler front cover 901 connected to the catalytic converter cylinder 81 and a muffler body 902. The tail pipe 93 passes through the muffler body 902 to guide the exhaust gas in the muffler 90 To the outside world. In addition, a cone 91 and a rectifier 92 are arranged in the muffler body 902 in sequence, and the cone 91 is connected to the rear end of the catalytic converter assembly 90.

However, as pollution regulations become more and more stringent, the exhaust device of the above-mentioned conventional locomotive engine only installs an oxygen sensor 77 on the exhaust front pipe 75, and cannot monitor the first downstream of the exhaust front pipe 75. The degradation degree of the catalytic converter 82 is not very satisfactory, and there is still room for improvement.

This is the reason for the creation. Based on the spirit of active invention and creation, he was eager to think of a "exhaust device for locomotive engine" that could solve the above problems. After several research experiments, he finally completed this creation.

In order to solve the aforementioned problems, and in response to increasingly stringent pollution regulations and legal norms, the regulations stipulate that the degradation degree of the catalytic converter must be inspected. This creation adds a downstream oxygen sensor behind the catalytic converter to detect By measuring the degradation degree of the catalytic converter, it can be known at any time whether the catalytic converter needs to be replaced, so as to comply with the requirements of environmental protection emission regulations.

To achieve the above purpose, the exhaust device of the creative locomotive engine includes an exhaust front pipe, a connecting pipe, an upstream oxygen sensor, a catalytic converter assembly, a downstream oxygen sensor, and a muffler . Wherein, the exhaust front pipe has an inlet end and an outlet end, the inlet end is connected with an exhaust end of an engine; the front end of the connecting pipe is connected with the outlet end of the exhaust front pipe, and the upstream oxygen sensor group On the connecting pipe; the catalytic converter assembly has a catalytic converter cylinder and a first catalytic converter arranged in the catalytic converter cylinder, the front end of the catalytic converter assembly and The rear end of the connecting pipe is connected; the downstream oxygen sensor assembly is arranged on the catalytic converter assembly and located downstream of the first catalytic converter; the muffler has a muffler front cover connected to the cylinder of the catalytic converter And a muffler body.

The above-mentioned catalytic converter cylinder is further provided with a second catalytic converter, which is located downstream of the downstream oxygen sensor, which can further have the purification function of exhaust gas emission.

The outlet end of the aforementioned exhaust front pipe and the front end of the connecting pipe can be welded together or other equivalent fixing methods.

The outlet end of the exhaust front pipe and the front end of the connecting pipe can be combined by a coupler, thereby facilitating the disassembly and assembly of the two.

The upstream oxygen sensor and the first catalytic converter may be arranged adjacently, and the downstream oxygen sensor and the first catalytic converter may also be arranged adjacently, that is, the upstream oxygen sensor and the downstream oxygen sensor They are respectively arranged in front of and behind the first catalytic converter.

The above-mentioned catalytic converter cylinder and the front cover of the muffler can be combined by welding or other equivalent fixing methods.

The above summary and the following detailed description are all exemplary in order to further illustrate the scope of patent application of the present invention. The other objectives and advantages of the present invention will be explained in the following descriptions and illustrations.

Please refer to Figure 2 which is a schematic diagram of the disposition of the exhaust device of the locomotive engine of the first preferred embodiment of this creation. The exhaust device of the locomotive engine of this embodiment includes: an exhaust front pipe 25, a connecting pipe 26, and an upstream containing The oxygen sensor 27, a catalytic converter assembly 30, a downstream oxygen sensor 37, a muffler 40 and a tail pipe 43. The front exhaust pipe 25 includes an inlet end 251 and an outlet end 252, and the inlet end 251 is connected to an exhaust end 201 of an engine 20. The front end of the connecting pipe 26 is in communication with the outlet end 252 of the exhaust front pipe 25, and the upstream oxygen sensor 27 is assembled on the connecting pipe 26 to detect changes in the oxygen content of the exhaust gas in the connecting pipe 26.

As shown in FIG. 2, the catalytic converter assembly 30 includes a catalytic converter cylinder 31, a connecting member 33, and a first catalytic converter 32 and a first catalytic converter 32 and a second catalytic converter disposed in the catalytic converter cylinder 31. Two catalytic converters 34, the front end of the catalytic converter cylinder 31 is connected to the rear end of the connecting pipe 26. The downstream oxygen sensor 37 is set on the connecting member 33 of the catalytic converter assembly 30 and located downstream of the first catalytic converter 32. The muffler 40 includes a muffler front cover 401 connected to the catalytic converter cylinder 31 and a muffler body 402. The tail pipe 43 is inserted through the muffler body 402 to guide the exhaust gas in the muffler 40. To the outside world.

In this embodiment, the muffler body 402 is provided with a conical tube 41 and a rectifier tube 42 connected in sequence, and the conical tube 41 is in communication with the catalytic converter assembly 30. In addition, the upstream oxygen sensor 27 and the downstream oxygen sensor 37 are respectively arranged adjacent to the front and rear of the first catalytic converter 32, and the second catalytic converter 34 is located downstream of the downstream oxygen sensor 37. In addition, the catalytic converter cylinder 31 and the muffler front cover 401 are welded together, and the outlet end 252 of the exhaust front pipe 25 and the front end of the connecting pipe 26 are also welded together.

Please refer to FIG. 3 for the layout diagram of the exhaust device of the locomotive engine of the second preferred embodiment of this creation. The structure of this embodiment is roughly the same as that of the first embodiment. The only difference lies in the exhaust front pipe 25 of this embodiment. The outlet end 252 and the front end of the connecting pipe 26 are combined by a coupler 28, and the outlet end 252 of the exhaust front pipe 25 and the front end of the connecting pipe 26 of the first embodiment are welded together. In this embodiment, the outlet end 252 of the exhaust front pipe 25 and the front end of the connecting pipe 26 are combined by a coupler 28, which facilitates the exhaust front pipe 25, the connecting pipe 26 and the catalytic converter assembly 30 at the rear end. , Disassembly and assembly of the silencer 40.

Both of the above-mentioned two embodiments can detect the purification function of the exhaust gas emission behind the first catalytic converter 32, and the degradation degree of the first catalytic converter 32 can be relatively known, and then it can be known that the first catalytic converter 32 and the Whether the second catalytic converter 34 needs to be replaced to meet the requirements of environmental protection emission regulations.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of rights claimed in this creation should be subject to the scope of the patent application, rather than being limited to the above-mentioned embodiments.

20, 70: Engine 201,701: exhaust end 25, 75: Exhaust front pipe 251,751: Entry side 252,752: export side 26, 76: connecting pipe 27: Upstream oxygen sensor 28: Combiner 30, 80: Catalytic converter assembly 31, 81: Catalytic converter cylinder 32, 82: The first catalytic converter 33, 83: connecting pieces 34, 84: second catalytic converter 37: Downstream oxygen sensor 40, 90: silencer 401, 901: Silencer front cover 402, 902: Muffler body 41, 91: Cone tube 42,92: rectifier tube 43,93: tail pipe 77: Oxygen Sensor

Fig. 1 is a schematic diagram of the arrangement of the exhaust device of a conventional locomotive engine. Fig. 2 is a schematic diagram of the disposition of the exhaust device of the locomotive engine of the first preferred embodiment of the invention. Fig. 3 is a schematic diagram of the disposition of the exhaust device of the locomotive engine of the second preferred embodiment of the present invention.

20: Engine

201: exhaust end

25: Exhaust front pipe

251: entry side

252: Exit

26: connecting pipe

27: Upstream oxygen sensor

30: Catalyst converter assembly

31: Catalytic converter cylinder

32: The first catalytic converter

33: connecting piece

34: The second catalytic converter

37: Downstream oxygen sensor

40: silencer

401: Silencer front cover

402: Silencer body

41: Cone tube

42: rectifier tube

43: Tailpipe

Claims (7)

An exhaust device for a locomotive engine, including: An exhaust front pipe, including an inlet end and an outlet end, the inlet end is connected with an exhaust end of an engine; A connecting pipe, the front end of which is in communication with the outlet end; An upstream oxygen sensor is assembled on the connecting pipe; A catalytic converter assembly including a catalytic converter cylinder and a first catalytic converter arranged in the catalytic converter cylinder, the front end of the catalytic converter assembly and the rear end of the connecting pipe Connected A downstream oxygen sensor assembled on the catalytic converter assembly and located downstream of the first catalytic converter; and A muffler includes a muffler front cover connected with the cylinder body of the catalytic converter and a muffler body. According to the exhaust device of a locomotive engine described in claim 1, the catalytic converter cylinder is further provided with a second catalytic converter, which is located downstream of the downstream oxygen sensor. The exhaust device of a locomotive engine according to claim 1, wherein the outlet end of the exhaust front pipe is welded to the front end of the connecting pipe. The exhaust device of a locomotive engine according to claim 1, wherein the outlet end of the exhaust front pipe and the front end of the connecting pipe are combined by a coupler. The exhaust device of a locomotive engine according to claim 1, wherein the upstream oxygen sensor is arranged adjacent to the first catalytic converter. The exhaust device of a locomotive engine according to claim 1, wherein the downstream oxygen sensor is arranged adjacent to the first catalytic converter. The exhaust device of a locomotive engine according to claim 1, wherein the catalytic converter cylinder and the muffler front cover are welded together.

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