Oxygen sensor configuration structure of motorcycle

Abstract

The utility model relates to an oxygen-containing sensor configuration structure of a motorcycle, which comprises an exhaust pipe, an upstream oxygen-containing sensor and a downstream oxygen-containing sensor, the exhaust pipe is matched with an engine for use and is sequentially provided with an exhaust front pipe, a catalyst assembly, a rectifying pipe and a silencer, the catalyst assembly is provided with a catalyst cylinder, a catalyst front cover and a catalyst rear cover, and the upstream oxygen-containing sensor and the downstream oxygen-containing sensor are arranged in the catalyst cylinder. The catalyst barrel is used for containing the catalyst converter and is connected to the exhaust front pipe and the rectifying pipe through the catalyst front cover and the catalyst rear cover respectively, in addition, the upstream oxygen sensor is connected to the exhaust front pipe, and the downstream oxygen sensor is connected to the catalyst rear cover. The waste gas can flow to the downstream oxygen sensor in a short time, so that the downstream oxygen sensor can sense the waste gas with higher temperature to improve the stability of sensing the oxygen content of the waste gas by the downstream oxygen sensor, and then maintenance personnel can carry out replacement operation before the catalytic converter is seriously degraded.

Description

Technical Field

[0001] The utility model relates to an oxygen sensor configuration structure of a motorcycle, in particular to an oxygen sensor configuration structure of a motorcycle, which enables the oxygen sensor to sense exhaust gas at a higher temperature, effectively improving the stability of the oxygen sensor in sensing the oxygen content of the exhaust gas, so that maintenance personnel can perform replacement operations before the catalytic converter deteriorates severely. Background Art

[0002] A motorcycle is a two-wheeled or three-wheeled vehicle that can move via an engine. Moreover, the motorcycle can change its moving direction via a steering mechanism. Thus, the motorcycle has the advantages of easy operation, convenient parking, and high mobility, making it the most popular means of transportation currently.

[0003] Currently, in order to avoid environmental pollution caused by the exhaust gas emitted by the engine of a motorcycle, a catalytic converter and an oxygen sensor are installed in the exhaust pipe of the motorcycle. The catalytic converter can purify the exhaust gas emitted by the engine, and the oxygen sensor can sense the oxygen content of the exhaust gas after passing through the catalytic converter. As a result, the engine control unit (ECU) can know whether the exhaust gas emitted from the engine meets the relevant environmental protection regulations after passing through the catalytic converter through the oxygen sensor, and the exhaust gas discharged from the engine can relatively reduce pollution to the external environment.

[0004] However, when both the catalytic converter and the oxygen sensor are installed in the straight pipe part in front of the muffler, the oxygen sensor is far from the catalytic converter. As a result, during the process of the exhaust gas emitted by the engine flowing from the catalytic converter to the oxygen sensor, the temperature of the exhaust gas gradually decreases, so that the oxygen sensor senses the exhaust gas at a lower temperature. Furthermore, the oxygen sensor cannot accurately sense the oxygen content of the exhaust gas. Consequently, the engine control unit (ECU) cannot accurately sense the degree of deterioration of the catalytic converter through the oxygen sensor. Once the catalytic converter deteriorates severely, not only can the catalytic converter not be replaced by maintenance personnel in a timely manner, but also the catalytic converter cannot filter and purify the exhaust gas, resulting in the exhaust gas discharged from the engine being directly emitted into the external environment without being filtered, causing environmental pollution. Summary of the Utility Model

[0005] The main purpose of the present utility model is to provide an oxygen sensor configuration structure for a motorcycle, which improves the installation position of the oxygen sensor on the exhaust pipe, enabling the oxygen sensor to be close to the catalytic converter. Then, when the exhaust gas of the engine flows through the catalytic converter, the exhaust gas will flow to the oxygen sensor in a short time, allowing the oxygen sensor to sense the exhaust gas at a higher temperature to improve the stability of the oxygen sensor in sensing the oxygen content of the exhaust gas. Furthermore, maintenance personnel can replace the new catalytic converter in a timely manner before the catalytic converter deteriorates severely. As a result, before replacing the catalytic converter, the exhaust gas emitted by the engine can not only meet the requirements of relevant environmental protection regulations but also will not pollute the environment.

[0006] To achieve the aforementioned purpose, the present utility model provides an oxygen sensor configuration structure for a motorcycle. The oxygen sensor configuration structure of the motorcycle includes: an exhaust pipe, at least one upstream oxygen sensor, and a downstream oxygen sensor.

[0007] The exhaust pipe is used in cooperation with an engine and has an exhaust front pipe, a catalytic assembly, a rectifying pipe, and a muffler. The catalytic assembly is provided with a catalytic cylinder body to accommodate a catalytic converter. One end of the catalytic cylinder body is installed with a catalytic front cover connected to the exhaust front pipe, and the other end is installed with a catalytic rear cover connected to the rectifying pipe. Then, the rectifying pipe is connected to the muffler, the upstream oxygen sensor is connected to the exhaust front pipe, and the downstream oxygen sensor is connected to the catalytic rear cover.

[0008] Wherein, the exhaust front pipe is provided with a first exhaust duct, a second exhaust duct, a manifold, and a front connection pipe. Both the first exhaust duct and the second exhaust duct are connected to the engine. The manifold is arranged between the first exhaust duct, the second exhaust duct, and the front connection pipe, and the front connection pipe is connected to the catalytic front cover.

[0009] In a preferred embodiment, the number of the upstream oxygen sensors is two. One of the two upstream oxygen sensors is connected to the first exhaust duct, and the other of the two upstream oxygen sensors is connected to the second exhaust duct.

[0010] In another preferred embodiment, the number of the upstream oxygen sensors is three. One of the three upstream oxygen sensors is connected to the first exhaust duct, and the other of the three upstream oxygen sensors is connected to the second exhaust duct. Then, the last one of the three upstream oxygen sensors is connected to the manifold or the front connection pipe.

[0011] In yet another preferred embodiment, the number of the upstream oxygen sensors is two. One of the first exhaust duct and the second exhaust duct is connected to one of the two upstream oxygen sensors, and the manifold is connected to the other one of the two upstream oxygen sensors.

[0012] In still another preferred embodiment, the number of the upstream oxygen sensors is two. One of the first exhaust duct and the second exhaust duct is connected to one of the two upstream oxygen sensors, and the front connecting pipe is connected to the other one of the two upstream oxygen sensors.

[0013] In the foregoing four embodiments, the catalyst rear cover is provided with a first connecting portion connected to the catalyst cylinder body and a second connecting portion connected to the rectifying pipe. The catalyst rear cover extends along a rear cover axis to form a turning portion between the first connecting portion and the second connecting portion, and the downstream oxygen sensor is connected to the turning portion.

[0014] Wherein, the cross-sectional profile of the turning portion is formed with a major axis passing through the rear cover axis and a minor axis passing through the rear cover axis and the major axis at the same time, and the insertion direction of the downstream oxygen sensor inserted into the turning portion is substantially parallel to the minor axis.

[0015] The feature of the present utility model is that the downstream oxygen sensor is connected to the catalyst rear cover of the catalyst assembly, so that the downstream oxygen sensor can be close to the catalyst converter of the catalyst assembly. Thereby, when the exhaust gas of the engine flows through the catalyst converter, the exhaust gas will flow to the downstream oxygen sensor in a short time, so that the downstream oxygen sensor can sense the exhaust gas at a higher temperature to improve the stability of the downstream oxygen sensor for sensing the oxygen content in the exhaust gas. Furthermore, the maintenance personnel can replace the new catalyst converter in time before the catalyst converter deteriorates severely. As a result, before replacing the catalyst converter, the exhaust gas emitted by the engine can not only meet the requirements of relevant environmental protection regulations, but also will not pollute the environment. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the oxygen sensor configuration structure of the motorcycle in the first preferred embodiment of the present utility model;

[0017] Figure 2 It is an exploded view of the oxygen sensor configuration structure of the motorcycle in the first preferred embodiment of the present utility model;

[0018] Figure 3 It is a cross-sectional view of the catalyst assembly;

[0019] Figure 4 It is a cross-sectional schematic diagram of the catalyst rear cover;

[0020] Figure 5Cross-sectional view of the downstream oxygen sensor connected to the catalyst rear cover;

[0021] Figure 6 Schematic diagram of the exhaust gas discharged from the engine flowing into the exhaust pipe;

[0022] Figure 7 Schematic diagram of the oxygen sensor configuration structure of the motorcycle in the second preferred embodiment of the present invention;

[0023] Figure 8 Schematic diagram of three upstream oxygen sensors respectively connected to the first exhaust duct, the second exhaust duct and the front connecting pipe;

[0024] Figure 9 Schematic diagram of the oxygen sensor configuration structure of the motorcycle in the third preferred embodiment of the present invention;

[0025] Figure 10 Schematic diagram of two upstream oxygen sensors respectively connected to the second exhaust duct and the manifold;

[0026] Figure 11 Schematic diagram of the oxygen sensor configuration structure of the motorcycle in the fourth preferred embodiment of the present invention;

[0027] Figure 12 Schematic diagram of two upstream oxygen sensors respectively connected to the second exhaust duct and the front connecting pipe.

[0028] Description of reference numerals: 1 - Oxygen sensor configuration structure of the motorcycle; 10 - Exhaust pipe; 11 - Front exhaust pipe; 111 - First exhaust duct; 112 - Second exhaust duct; 113 - Manifold; 114 - Front connecting pipe; 12 - Catalyst assembly; 121 - Catalyst cylinder; 122 - Catalyst converter; 123 - Catalyst front cover; 124 - Catalyst rear cover; 124a - First connecting portion; 124b - Second connecting portion; 124c - Steering portion; 13 - Rectifier tube; 131 - Catalyst assembly connecting section; 132 - Muffler connecting section; 133 - Auxiliary catalyst converter; 14 - Muffler; 20 - Upstream oxygen sensor; 30 - Downstream oxygen sensor; 40 - Engine control unit; L1 - Axis of the rear cover; L2 - Long axis; L3 - Short axis. Detailed description of the preferred embodiments

[0029] The present invention will be further described below in conjunction with specific embodiments and the accompanying drawings. The advantages and features of the present invention will become clearer as the description proceeds.

[0030] Please refer to Figure 1 And Figure 2As shown, in the first preferred embodiment, the present utility model provides an oxygen sensor configuration structure 1 for a motorcycle, comprising: an exhaust pipe 10, a plurality of upstream oxygen sensors 20 and a downstream oxygen sensor 30. As shown in the figure, the exhaust pipe 10 is used in cooperation with an engine (not shown in the figure). And the exhaust pipe 10 is mainly composed of an exhaust front pipe 11, a catalytic converter assembly 12, a rectifying pipe 13 and a muffler 14. Among them, one end of the exhaust front pipe 11 is connected to the engine, and the end of the exhaust front pipe 11 far from the engine is connected to the catalytic converter assembly 12, so that the exhaust front pipe 11 is located between the engine and the catalytic converter assembly 12. In this embodiment, the engine is a twin-cylinder engine, and the exhaust front pipe 11 is provided with a first exhaust duct 111, a second exhaust duct 112, a collector pipe 113 and a front connection pipe 114. Both the first exhaust duct 111 and the second exhaust duct 112 are connected to the engine, and the collector pipe 113 is arranged between the first exhaust duct 111, the second exhaust duct 112 and the front connection pipe 114. After the engine discharges exhaust gas into the first exhaust duct 111 and the second exhaust duct 112, the collector pipe 113 can direct the exhaust gas in the first exhaust duct 111 and the exhaust gas in the second exhaust duct 112 into the interior of the front connection pipe 114.

[0031] Please refer to Figure 2 and Figure 3 As shown, the catalytic converter assembly 12 of the exhaust pipe 10 has a catalytic converter cylinder 121, two catalytic converters 122, a catalytic converter front cover 123 and a catalytic converter rear cover 124. The catalytic converter cylinder 121 presents a hollow state, and the catalytic converter cylinder 121 is used to accommodate the two catalytic converters 122, and the two catalytic converters 122 are arranged at intervals inside the catalytic converter cylinder 121. In addition, the appearance of the catalytic converter front cover 123 presents a conical state, and one end of the catalytic converter front cover 123 is connected to one end of the catalytic converter cylinder 121, and the other end of the catalytic converter front cover 123 is connected to the front connection pipe 114 of the exhaust front pipe 11. Among them, the appearance of the catalytic converter rear cover 124 presents a conical state, and one end of the catalytic converter rear cover 124 is connected to the other end of the catalytic converter cylinder 121, so that the catalytic converter cylinder 121 is located between the catalytic converter front cover 123 and the catalytic converter rear cover 124, and the other end of the catalytic converter rear cover 124 is connected to the rectifying pipe 13, as Figure 3 and Figure 4As shown, in this embodiment, a first connecting portion 124a with a circular appearance and a second connecting portion 124b with a circular appearance are respectively provided at opposite ends of the catalyst rear cover 124. Moreover, the catalyst rear cover 124 extends along a rear cover axis L1 to form a turning portion 124c between the first connecting portion 124a and the second connecting portion 124b. Among them, the first connecting portion 124a is connected to the catalyst cylinder 121, and the second connecting portion 124b is connected to the rectifier tube 13. Then, the cross-sectional contour of the turning portion 124c forms a major axis L2 and a minor axis L3 whose length is shorter than the major axis L2. The major axis L2 is perpendicularly arranged to the minor axis L3, and both the major axis L2 and the minor axis L3 pass through the rear cover axis L1.

[0032] Please refer to again Figure 1 and Figure 2 As shown, the rectifier tube 13 of the exhaust pipe 10 has a catalyst assembly connection section 131 and a muffler connection section 132. The catalyst assembly connection section 131 is connected to the catalyst rear cover 124 of the catalyst assembly 12, and the muffler connection section 132 passes through the interior of the muffler 14. Moreover, an auxiliary catalyst converter 133 is installed inside the muffler connection section 132.

[0033] Please refer to again Figure 1 As shown, a plurality of upstream oxygen sensors 20 are all connected to the front exhaust pipe 11 of the exhaust pipe 10. In this embodiment, the oxygen sensor configuration structure 1 of the motorcycle has two upstream oxygen sensors 20. As shown in the figure, one of the upstream oxygen sensors 20 is connected to the first exhaust duct 111 of the front exhaust pipe 11, and the other upstream oxygen sensor 20 is connected to the second exhaust duct 112 of the front exhaust pipe 11. In addition, the downstream oxygen sensor 30 is connected to the catalyst rear cover 124 of the catalyst assembly 12. In this embodiment, as Figure 5 shown, when the downstream oxygen sensor 30 is connected to the catalyst rear cover 124, the insertion direction of the downstream oxygen sensor 30 inserted into the turning portion 124c is substantially parallel to the minor axis L3 of the turning portion 124c, so that the end of the downstream oxygen sensor 30 can be close to the rear cover axis L1 of the catalyst rear cover 124.

[0034] Please refer to Figure 6As shown, in the first preferred embodiment, the specific application of the oxygen sensor configuration structure 1 of the motorcycle is described. When the engine is running and discharging exhaust gas into the exhaust pipe 10, the exhaust gas can flow through the front exhaust pipe 11 of the exhaust pipe 10, the catalytic converter assembly 12 of the exhaust pipe 10, the rectifying pipe 13 of the exhaust pipe 10, and the muffler 14 of the exhaust pipe 10 in sequence. When the exhaust gas flows into the interior of the front exhaust pipe 11, the upstream oxygen sensor 20 starts to sense the exhaust gas just discharged from the engine, so that the upstream oxygen sensor 20 senses the oxygen content of the exhaust gas in the front exhaust pipe 11 to form a first sensing signal transmitted to an engine control unit (ECU) 40. The downstream oxygen sensor 30 senses the exhaust gas flowing through the catalytic converter 122, so that the downstream oxygen sensor 30 senses the oxygen content of the exhaust gas in the rear catalytic converter cover 124 to form a second sensing signal transmitted to the engine control unit (ECU) 40. Then, the engine control unit (ECU) 40 can not only sense the degree of deterioration of the catalytic converter 122 through the difference value between the first sensing signal and the second sensing signal, but also sense whether the catalytic converter 122 has effectively filtered the exhaust gas. Thus, maintenance personnel can replace the new catalytic converter 122 in time before the catalytic converter 122 deteriorates severely. As a result, before replacing the catalytic converter 122, the exhaust gas emitted by the engine will not only not pollute the environment, but also comply with the regulations of relevant environmental protection laws. In this embodiment, since the downstream oxygen sensor 30 is connected to the rear catalytic converter cover 124 of the catalytic converter assembly 12, the downstream oxygen sensor 30 can be close to the catalytic converter 122 of the catalytic converter assembly 12. Therefore, when the exhaust gas of the engine flows through the catalytic converter 122, the exhaust gas will flow to the downstream oxygen sensor 30 in a short time, so that the downstream oxygen sensor 30 can sense the exhaust gas at a higher temperature to improve the stability of the downstream oxygen sensor 30 in sensing the oxygen content of the exhaust gas.

[0035] Please refer to Figure 7 As shown, in the second preferred embodiment, the difference from the first preferred embodiment lies in the installation position of the upstream oxygen sensor 20 on the exhaust pipe 10. The structures of the exhaust pipe 10, the upstream oxygen sensor 20, and the downstream oxygen sensor 30 are the same as those in the first preferred embodiment. Therefore, the structures of the exhaust pipe 10, the upstream oxygen sensor 20, and the downstream oxygen sensor 30 will not be described repeatedly in this embodiment. As Figure 7 shown, in this embodiment, the oxygen sensor configuration structure 1 of the motorcycle has three upstream oxygen sensors 20. One of the upstream oxygen sensors 20 is connected to the first exhaust duct 111 of the front exhaust pipe 11, another upstream oxygen sensor 20 is connected to the second exhaust duct 112 of the front exhaust pipe 11, and the last upstream oxygen sensor 20 is connected to the manifold 113 of the front exhaust pipe 11. However, the connection of the three upstream oxygen sensors 20 to the first exhaust duct 111, the second exhaust duct 112, and the manifold 113 is only for convenience of description. Also asFigure 8 As shown, three upstream oxygen sensors 20 are respectively connected to the first exhaust duct 111, the second exhaust duct 112 and the front connecting pipe 114 of the front exhaust pipe 11.

[0036] Please refer to Figure 9 As shown, in the third preferred embodiment, the difference from the first preferred embodiment lies in the position where the upstream oxygen sensor 20 is installed on the exhaust pipe 10. In this embodiment, the oxygen sensor configuration structure 1 of the motorcycle has two upstream oxygen sensors 20, and one of the upstream oxygen sensors 20 is connected to the second exhaust duct 112 of the front exhaust pipe 11, and the other upstream oxygen sensor 20 is connected to the manifold 113 of the front exhaust pipe 11. However, the connection of the two upstream oxygen sensors 20 to the second exhaust duct 112 and the manifold 113 respectively is only for convenience of description. Also as Figure 10 shown, one of the upstream oxygen sensors 20 is connected to the first exhaust duct 111 of the front exhaust pipe 11, and the other upstream oxygen sensor 20 is connected to the manifold 113.

[0037] Please refer to Figure 11 As shown, in the fourth preferred embodiment, the difference from the first preferred embodiment lies in the position where the upstream oxygen sensor 20 is installed on the exhaust pipe 10. In this embodiment, the oxygen sensor configuration structure 1 of the motorcycle has two upstream oxygen sensors 20, and one of the upstream oxygen sensors 20 is connected to the second exhaust duct 112 of the front exhaust pipe 11, and the other upstream oxygen sensor 20 is connected to the front connecting pipe 114 of the front exhaust pipe 11. However, the connection of the two upstream oxygen sensors 20 to the second exhaust duct 112 and the front connecting pipe 114 respectively is only for convenience of description. Also as Figure 12 shown, one of the upstream oxygen sensors 20 is connected to the first exhaust duct 111 of the front exhaust pipe 11, and the other upstream oxygen sensor 20 is connected to the front connecting pipe 114.

[0038] The above description is illustrative rather than restrictive to the present utility model. Those of ordinary skill in the art can understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the claims, and all of them will fall within the protection scope of the present utility model.

Claims

1. A motorcycle oxygen sensor configuration structure, characterized in that: Include: An exhaust pipe, used in conjunction with an engine, and having an exhaust front pipe, a catalyst assembly, a rectifier pipe and a muffler, wherein the catalyst assembly is provided with a catalyst cylinder to accommodate a catalytic converter, and a catalyst front cover connected to the exhaust front pipe is installed at one end of the catalyst cylinder, and a catalyst rear cover connected to the rectifier pipe is installed at the other end, and the rectifier pipe is connected to the muffler; at least one upstream oxygen sensor connected to the exhaust front pipe; as well as A downstream oxygen sensor is connected to the catalyst rear cover.

2. The oxygen sensor configuration structure of a motorcycle according to claim 1, characterized in that: The exhaust front pipe is provided with a first exhaust conduit, a second exhaust conduit, a header and a front connecting pipe. Both the first exhaust conduit and the second exhaust conduit are connected to the engine. The header is arranged between the first exhaust conduit, the second exhaust conduit and the front connecting pipe. The front connecting pipe is connected to the catalyst front cover.

3. The oxygen sensor configuration structure of a motorcycle according to claim 2, characterized in that: The number of the upstream oxygen sensors is two, one of the two upstream oxygen sensors is connected to the first exhaust conduit, and the other of the two upstream oxygen sensors is connected to the second exhaust conduit.

4. The oxygen sensor configuration structure of a motorcycle according to claim 2, characterized in that: The number of the upstream oxygen sensors is three, one of which is connected to the first exhaust duct, another of which is connected to the second exhaust duct, and the last of which is connected to the manifold or the front connecting pipe.

5. The oxygen sensor configuration structure of a motorcycle according to claim 2, characterized in that: The number of the upstream oxygen sensors is two, one of the first exhaust conduit and the second exhaust conduit is connected to one of the two upstream oxygen sensors, and the manifold is connected to the other of the two upstream oxygen sensors.

6. The oxygen sensor configuration structure of a motorcycle according to claim 2, characterized in that: The number of the upstream oxygen sensors is two, one of the first exhaust duct and the second exhaust duct is connected to one of the two upstream oxygen sensors, and the front connecting pipe is connected to the other of the two upstream oxygen sensors.

7. The oxygen sensor configuration structure of a motorcycle according to claim 1, characterized in that: The catalyst rear cover is provided with a first connection portion connected to the catalyst cylinder and a second connection portion connected to the rectifier tube, and the catalyst rear cover extends along a rear cover axis to form a turning portion located between the first connection portion and the second connection portion, and the downstream oxygen sensor is connected to the turning portion.

8. The oxygen sensor configuration structure of a motorcycle according to claim 7, characterized in that: The cross-sectional profile of the turning portion is formed with a major axis passing through the axis of the rear cover and a minor axis passing through both the axis of the rear cover and the major axis, and the insertion direction of the downstream oxygen sensor into the turning portion is parallel to the minor axis.

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