Motorcycle and muffler, catalyst deterioration identification method, and storage medium

Abstract

The application relates to a motorcycle and a muffler thereof, a catalyst deterioration identification method and a storage medium. The muffler of the motorcycle comprises a muffler body, a first catalyst, a front oxygen sensor and a rear oxygen sensor. An air inlet of the muffler body is provided with a pipeline for communicating with an exhaust port of an engine. The first catalyst is arranged on the pipeline. The front oxygen sensor is located upstream of the first catalyst. The rear oxygen sensor is located downstream of the first catalyst. The interval between the central axis of the front oxygen sensor and the central axis of the rear oxygen sensor is S, S is 350mm-480mm; the volume of the first catalyst is B, the displacement of the engine is V, and the volume of the pipeline region corresponding to the central axis of the front oxygen sensor and the central axis of the rear oxygen sensor is C, B is 0.8V-1.4V, and C is 1.1V-2.1V. If the first catalyst does not deteriorate, the rear oxygen electric signal curve is a straight line or substantially a straight line, that is, the rear oxygen electric signal has a small number of flip times. Therefore, the identifiable degree can be improved, and the judgment accuracy is high.

Description

Technical Field

[0001] This application relates to the field of motorcycle parts technology, and in particular to a motorcycle and its muffler, a catalyst degradation identification method and storage medium. Background Technology

[0002] A motorcycle muffler is installed on the engine's exhaust port. After combustion, the exhaust gases are reduced in noise and energy before being released into the atmosphere. In related technologies, motorcycle mufflers, in addition to fulfilling the aforementioned functions, also reduce pollutant emissions and enhance noise reduction. Specifically, a catalyst is installed on the muffler's air duct. Through a chemical reaction of precious metal materials in the catalyst, the exhaust gases emitted during engine operation are converted into non-toxic substances such as carbon dioxide and water, which are then released into the atmosphere, reducing the amount of pollutants emitted and thus meeting relevant emission standards.

[0003] Due to increasingly stringent environmental regulations, a front oxygen sensor (referred to as "front oxygen") is installed in front of the catalyst along the airflow direction, and a rear oxygen sensor (referred to as "rear oxygen") is installed behind the catalyst to monitor whether the catalyst is deteriorating. The motorcycle's ECU (Electronic Control Unit) collects electrical signals from the front and rear oxygen sensors. A single rotation is recorded as the transition from a peak to a trough or vice versa in the electrical signal curve. The ECU determines whether the ratio of the number of rotations in the rear oxygen signal to the number of rotations in the front oxygen signal is greater than a preset threshold. If it is greater than the preset threshold, the catalytic converter is considered deteriorated, and a fault indicator light illuminates accordingly. However, even when the catalyst is not deteriorated, it can easily be mistaken for deterioration, making the identification of deteriorated and non-deteriorated catalysts relatively low. Summary of the Invention

[0004] Therefore, it is necessary to overcome the shortcomings of the existing technology and provide a method and storage medium for identifying the degradation of motorcycles and their mufflers, as well as catalyst degradation. This method can improve the identifiability of catalyst degradation and non-degradation and has a high accuracy in judgment.

[0005] A motorcycle muffler, the motorcycle muffler comprising:

[0006] The muffler body has an air inlet with a pipe for communicating with the exhaust port of the engine.

[0007] The first catalyst is disposed on the pipeline and is used to purify the exhaust gas discharged from the engine.

[0008] An oxygen sensor is disposed on the pipeline and located upstream of the first catalyst along the airflow direction;

[0009] A post-oxygen sensor is disposed on the pipeline and located downstream of the first catalyst along the airflow direction;

[0010] Wherein, the distance between the central axis of the front oxygen sensor and the central axis of the rear oxygen sensor is set as S, where S is 350mm to 480mm; the volume of the first catalyst is set as B, the displacement of the engine is set as V, and the volume of the pipeline area corresponding to the central axis of the front oxygen sensor and the central axis of the rear oxygen sensor is set as C, where B is 0.8V to 1.4V and C is 1.1V to 2.1V.

[0011] In one embodiment, S is 160mm to 170mm; B is 1V to 1.2V; and C is 1.5V to 1.7V.

[0012] In one embodiment, the pipeline includes a first connecting pipe and a second connecting pipe; one end of the first connecting pipe is connected to the exhaust port of the engine, and the other end of the first connecting pipe is connected to the first catalyst; one end of the second connecting pipe is connected to the first catalyst, and the other end of the second connecting pipe is connected to the muffler body.

[0013] In one embodiment, the pipeline further includes a first docking member and a second docking member; the first docking member is connected between the first connecting pipe and the first catalyst, and the first docking member or the first connecting pipe is provided with a first mounting part, and the front oxygen sensor is mounted on the first mounting part; the second docking member is connected between the second connecting pipe and the first catalyst, and the second docking member or the second connecting pipe is provided with a second mounting part, and the rear oxygen sensor is mounted on the second mounting part.

[0014] In one embodiment, the first catalyst includes a housing, a honeycomb disposed inside the housing, and a noble metal coating disposed on the outer surface of the honeycomb.

[0015] In one embodiment, the motorcycle muffler further includes a second catalyst disposed on the pipeline, wherein the first catalyst and the second catalyst are arranged sequentially along the airflow direction.

[0016] A motorcycle includes a muffler, an engine, and a controller. The exhaust port of the engine is connected to the pipeline, and the controller is electrically connected to the engine, the front oxygen sensor, and the rear oxygen sensor.

[0017] A method for identifying catalytic degradation in a motorcycle, comprising the following steps:

[0018] Acquire the pre-oxygen electrical signal from the pre-oxygen sensor and plot the pre-oxygen electrical signal curve as the pre-oxygen electrical signal changes with running time;

[0019] Acquire the post-oxygen electrical signal from the post-oxygen sensor and plot the post-oxygen electrical signal curve as the post-oxygen electrical signal changes with running time;

[0020] The first number of reversals within a preset time period is obtained based on the pre-oxygen electrical signal curve, and the second number of reversals within a preset time period is obtained based on the post-oxygen electrical signal curve.

[0021] When the ratio of the first number of flips to the second number of flips is greater than a preset threshold, it is determined that the first catalyst has deteriorated.

[0022] In one embodiment, the catalytic degradation identification method for the motorcycle further includes:

[0023] After determining that the first catalyst has deteriorated, the procedure further includes performing at least one of the following actions: light indication, voice prompt, vibration prompt, and display screen display.

[0024] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method.

[0025] The aforementioned motorcycle, its muffler, catalyst degradation identification method, and storage medium, after extensive experimental research, revealed that when S is set to 350mm–480mm, B to 0.8V–1.4V, and C to 1.1V–2.1V, if the first catalyst has not deteriorated, the subsequent oxygen electrical signal curve is a straight line or approximately a straight line, meaning the number of reversals in the subsequent oxygen electrical signal is low, almost zero. The preceding oxygen electrical signal curve is a relatively regular S-shape, with the number of reversals gradually increasing over time, and the ratio is significantly less than a preset threshold. If the first catalyst deteriorates, both the subsequent and preceding oxygen electrical signal curves are, for example, relatively regular S-shapes, with the number of reversals gradually increasing over time. Furthermore, the subsequent and preceding oxygen electrical signal curves almost overlap, and the number of reversals is almost the same, with a ratio greater than a preset threshold, indicating catalyst degradation. Therefore, this method improves the identifiability of the first catalyst's degradation and provides high accuracy. Attached Figure Description

[0026] Figure 1 This is a graph showing the electrical signal when the catalyst in the relevant technology has not deteriorated.

[0027] Figure 2 This is a graph showing the electrical signal curves when the catalyst deteriorates in related technologies.

[0028] Figure 3This is a schematic diagram of the structure of a motorcycle muffler according to an embodiment of this application.

[0029] Figure 4 This is a schematic diagram of the first catalyst structure of a motorcycle muffler according to an embodiment of this application.

[0030] Figure 5 This is an electrical signal curve of a catalyst without degradation according to an embodiment of this application.

[0031] Figure 6 This is an electrical signal curve of a catalyst deteriorating according to an embodiment of this application.

[0032] 10. Silencing body; 11. Pipeline; 111. First connecting pipe; 1111. First mounting part; 112. Second connecting pipe; 1121. Second mounting part; 113. First docking part; 114. Second docking part; 20. First catalyst; 30. Front oxygen sensor; 40. Rear oxygen sensor. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] As described in the background section, in related technologies, even when the catalyst is not deteriorated, it can easily be judged as deteriorated, resulting in low distinguishability between deteriorated and non-deteriorated catalysts. The inventors have discovered that the reason for this problem is... (Please refer to...) Figure 1 and Figure 2 , Figure 1 The diagram illustrates how, in related technologies, when the catalyst does not deteriorate and the motorcycle's speed is controlled at a constant rate, curves are plotted based on the electrical signals detected by the front and rear oxygen sensors, showing the changes over operating time. Figure 2 This illustrates a process where, in a related technology, catalyst degradation occurs and the motorcycle's speed is controlled at a constant rate. The resulting curves, plotted based on the electrical signals detected by the front and rear oxygen sensors, represent the changes over operating time. Figure 1 As can be seen, when the catalyst is not degraded, the post-oxygen electrical signal curve exhibits an irregular, zigzag shape with multiple flips. Furthermore, the pre-oxygen electrical signal curve also shows an irregular, zigzag shape with multiple flips. Since the ratio of the number of flips in the post-oxygen electrical signal to the number of flips in the pre-oxygen electrical signal may exceed a preset threshold, it can lead to a false judgment of catalyst degradation. Figure 2As can be seen, when the catalyst deteriorates, the post-oxygen electrical signal curve is irregularly tortuous, and the pre-oxygen electrical signal curve is also irregularly tortuous. Moreover, the curves of the post-oxygen electrical signal and the pre-oxygen electrical signal almost overlap, and the number of reversals of the post-oxygen electrical signal and the pre-oxygen electrical signal are almost the same. The ratio is greater than the preset threshold, which is judged as catalyst deterioration.

[0035] Based on the above reasons, this application provides a motorcycle and its muffler, a method for identifying catalyst degradation and a storage medium, which can improve the identifiability of catalyst degradation and non-degradation and provide a solution with high accuracy.

[0036] See Figures 3 to 6 , Figure 3 A schematic diagram of the structure of a motorcycle muffler according to an embodiment of this application is shown. Figure 4 A schematic diagram of the structure of the first catalyst 20 of a motorcycle muffler according to an embodiment of this application is shown. Figure 5 The diagram shows the electrical signal curves when the catalyst of an embodiment of this application is not degraded. Figure 6 The diagram shows an electrical signal curve when the catalyst deteriorates according to an embodiment of this application. An embodiment of this application provides a motorcycle muffler, which includes: a muffler body 10, a first catalyst 20, a front oxygen sensor 30, and a rear oxygen sensor 40. The air intake of the muffler body 10 is provided with a pipe 11 for communicating with the exhaust port of an engine. The first catalyst 20 is disposed on the pipe 11 and is used to purify the exhaust gas emitted from the engine (not shown in the figure). The front oxygen sensor 30 is disposed on the pipe 11 and is located upstream of the first catalyst 20 along the airflow direction. The rear oxygen sensor 40 is disposed on the pipe 11 and is located downstream of the first catalyst 20 along the airflow direction.

[0037] The distance between the central axis of the front oxygen sensor 30 and the central axis of the rear oxygen sensor 40 is set as S, where S is 350mm to 480mm; the volume of the first catalyst 20 is set as B; the engine displacement is set as V; and the volume of the pipe 11 area corresponding to the central axis of the front oxygen sensor 30 and the central axis of the rear oxygen sensor 40 is set as C, where B is 0.8V to 1.4V and C is 1.1V to 2.1V.

[0038] The aforementioned motorcycle muffler, after extensive testing and research, found that when S is set to 350mm–480mm, B to 0.8V–1.4V, and C to 1.1V–2.1V, please refer to [the relevant documentation / reference needed]. Figure 5 If the first catalyst 20 does not deteriorate, the post-oxygen electrical signal curve will be a straight line or approximately a straight line, meaning the number of reversals in the post-oxygen electrical signal is low, almost zero. The pre-oxygen electrical signal curve will be a relatively regular S-shape, with the number of reversals gradually increasing over time, and the ratio will be significantly less than the preset threshold. Please refer to [link to relevant documentation]. Figure 6If the first catalyst 20 deteriorates, the subsequent oxygen electrical signal curve and the preceding oxygen electrical signal curve will each exhibit a relatively regular S-shape, with the number of flips gradually increasing over time. Furthermore, the subsequent oxygen electrical signal curve almost overlaps with the preceding oxygen electrical signal curve, and the number of flips for the subsequent and preceding oxygen electrical signals is almost the same. If the ratio exceeds a preset threshold, it is determined that the catalyst has deteriorated. Therefore, this method improves the identifiability of deterioration and non-deterioration of the first catalyst 20, resulting in higher accuracy.

[0039] It should be noted that in this embodiment, both volume B and volume C are related to the engine displacement V, thereby improving applicability. In other words, different engine models have different displacements V. When the displacement V changes, the volumes B and C will be flexibly adjusted and set accordingly, as long as B is between 0.8V and 1.4V and C is between 1.1V and 2.1V.

[0040] It should also be noted that the preset threshold can be flexibly adjusted and set according to actual needs, and no restrictions are imposed here.

[0041] It should also be noted that the airflow direction in this embodiment is as follows: Figure 4 As shown by arrow f in the diagram.

[0042] In one embodiment, S is 390mm to 440mm; B is 1V to 1.2V; and C is 1.5V to 1.7V. Thus, when the first catalyst 20 does not deteriorate, the straighter the line drawn from the post-oxygen electrical signal collected by the post-oxygen sensor 40 over time, the better, meaning the fewer times the post-oxygen electrical signal flips, reaching 0 times.

[0043] In one specific embodiment, S includes, but is not limited to, 350mm, 360mm, 365mm, 370mm, 385mm, 390mm, 410mm, 420mm, 460mm, 470mm, 480mm, etc., and can be flexibly selected and adjusted between 130mm and 200mm according to actual needs.

[0044] In one specific embodiment, B includes, but is not limited to, 0.8V, 0.9V, 1V, 1.1V, 1.2V, 1.3V or 1.4V, etc., and can be flexibly selected and adjusted between 0.8V and 1.4V according to actual needs.

[0045] In one specific embodiment, C includes, but is not limited to, 1.1V, 1.2V, 1.3V, 1.4V, 1.5V, 1.6V, 1.7V, 1.8V, 1.9V, 2V, 2.1V, etc., and can be flexibly selected and adjusted between 1.1V and 2.1V according to actual needs.

[0046] Please see Figure 3 and Figure 4 In one embodiment, the pipeline 11 includes a first connecting pipe 111 and a second connecting pipe 112. One end of the first connecting pipe 111 is connected to the exhaust port of the engine, and the other end of the first connecting pipe 111 is connected to the first catalyst 20. One end of the second connecting pipe 112 is connected to the first catalyst 20, and the other end of the second connecting pipe 112 is connected to the muffler body 10. Thus, the exhaust gas discharged from the engine's exhaust port enters the first connecting pipe 111, is transported to the first catalyst 20 by the first connecting pipe 111, is purified by the first catalyst 20, and is then output to the second connecting pipe 112, is transported to the muffler body 10, is muffled by the muffler body 10, and is discharged to the outside after being muffled by the muffler body 10.

[0047] Please see Figure 3 and Figure 4 In one embodiment, the pipeline 11 further includes a first connecting member 113 and a second connecting member 114. The first connecting member 113 is connected between the first connecting pipe 111 and the first catalyst 20. The first connecting member 113 or the first connecting pipe 111 is provided with a first mounting portion 1111, and the front oxygen sensor 30 is mounted on the first mounting portion 1111. The second connecting member 114 is connected between the second connecting pipe 112 and the first catalyst 20. The second connecting member 114 or the second connecting pipe 112 is provided with a second mounting portion 1121, and the rear oxygen sensor 40 is mounted on the second mounting portion 1121. Thus, the diameters of the two ends of the first catalyst 20 are generally larger than the diameters of the first connecting pipe 111 and the second connecting pipe 112, respectively. By providing the first connecting member 113 and the second connecting member 114, it is easy to connect the two ends of the first catalyst 20 to the first connecting pipe 111 and the second connecting pipe 112, respectively, which facilitates assembly operations.

[0048] Please see Figure 3 and Figure 4 In one embodiment, the first docking member 113 includes, but is not limited to, a connector tube whose diameter gradually increases along the airflow direction, so as to enable the connection between the first connecting tube 111 with a relatively small diameter and the first catalyst 20 with a relatively large diameter; similarly, the second docking member 114 includes, but is not limited to, a connector tube whose diameter gradually decreases along the airflow direction, so as to enable the connection between the first catalyst 20 with a relatively large diameter and the second connecting tube 112 with a relatively small diameter.

[0049] In one embodiment, the first mounting part 1111 is connected to the wall of the connector tube, and the second mounting part 1121 is connected to the wall of the connector tube.

[0050] It should be noted that the "first mounting part 1111" can be a part of the "first docking part 113", that is, the "first mounting part 1111" and the "other parts of the first docking part 113" can be integrally molded; or it can be an independent component that can be separated from the "other parts of the first docking part 113", that is, the "first mounting part 1111" can be manufactured independently and then combined with the "other parts of the first docking part 113" to form a whole.

[0051] It should be noted that the "second mounting part 1121" can be a part of the "second docking member 114", that is, the "second mounting part 1121" and the "other parts of the second docking member 114" can be integrally molded; or it can be an independent component that can be separated from the "other parts of the second docking member 114", that is, the "second mounting part 1121" can be manufactured independently and then combined with the "other parts of the second docking member 114" to form a whole.

[0052] It should be noted that the "first docking component 113" can be a part of the "first connecting pipe 111 or the first catalyst 20", that is, the "first docking component 113" can be integrally formed with the "other parts of the first connecting pipe 111 or the first catalyst 20"; or it can be a separate component that can be separated from the "other parts of the first connecting pipe 111 or the first catalyst 20", that is, the "first docking component 113" can be manufactured independently and then combined with the "other parts of the first connecting pipe 111 or the first catalyst 20" to form a whole.

[0053] It should be noted that the "second docking component 114" can be a part of the "second connecting pipe 112 or the first catalyst 20", that is, the "second docking component 114" can be integrally formed with the "other parts of the second connecting pipe 112 or the first catalyst 20"; or it can be a separate component that can be separated from the "other parts of the second connecting pipe 112 or the first catalyst 20", that is, the "second docking component 114" can be manufactured independently and then combined with the "other parts of the second connecting pipe 112 or the first catalyst 20" to form a whole.

[0054] In one embodiment, the first catalyst 20 includes a housing, a honeycomb disposed inside the housing, and a precious metal coating disposed on the outer surface of the honeycomb.

[0055] Optionally, the honeycomb structure may include, but is not limited to, ceramic honeycomb. Ceramic materials are resistant to high temperatures, have good chemical stability, do not participate in chemical reactions, and have a long service life.

[0056] In one embodiment, the motorcycle muffler further includes a second catalyst (not shown) disposed on the pipe 11. The first catalyst 20 and the second catalyst are arranged sequentially along the airflow direction. Thus, after the first catalyst 20 performs preliminary purification treatment on the exhaust gas emitted by the engine, the second catalyst performs further purification treatment on the pre-purified exhaust gas, thereby improving the purification effect of the exhaust gas.

[0057] Please see Figure 3 and Figure 4 In one embodiment, a motorcycle includes the muffler of any of the motorcycles described above, and the motorcycle also includes an engine and a controller. The exhaust port of the engine is connected to pipe 11, and the controller is electrically connected to the engine, the front oxygen sensor 30, and the rear oxygen sensor 40, respectively.

[0058] The aforementioned motorcycle muffler, after extensive testing and research, found that when S is set to 350mm–480mm, B to 0.8V–1.4V, and C to 1.1V–2.1V, please refer to [the relevant documentation / reference needed]. Figure 5 If the first catalyst 20 does not deteriorate, the post-oxygen electrical signal curve will be a straight line or approximately a straight line, meaning the number of reversals in the post-oxygen electrical signal is low, almost zero. The pre-oxygen electrical signal curve will be a relatively regular S-shape, with the number of reversals gradually increasing over time, and the ratio will be significantly less than the preset threshold. Please refer to [link to relevant documentation]. Figure 6 If the first catalyst 20 deteriorates, the subsequent oxygen electrical signal curve and the preceding oxygen electrical signal curve will each exhibit a relatively regular S-shape, with the number of flips gradually increasing over time. Furthermore, the subsequent oxygen electrical signal curve almost overlaps with the preceding oxygen electrical signal curve, and the number of flips for the subsequent and preceding oxygen electrical signals is almost the same. If the ratio exceeds a preset threshold, it is determined that the catalyst has deteriorated. Therefore, this method improves the identifiability of deterioration and non-deterioration of the first catalyst 20, resulting in higher accuracy.

[0059] In one embodiment, the motorcycle also includes a prompter. The prompter is electrically connected to the controller and is used to provide a prompt when it is determined that the first catalyst 20 has deteriorated. Optionally, the prompter may include, but is not limited to, an indicator light, a voice player, a vibrator, a display, etc. Thus, when it is determined that the first catalyst 20 has deteriorated, the prompter provides a timely prompt, and maintenance is performed promptly based on the prompt information.

[0060] In one embodiment, the controller is also electrically connected to the engine and is used to control the engine operation accordingly based on the electrical signals from the front oxygen sensor 30 and / or the rear oxygen sensor 40. Specifically, when the first catalyst 20 is detected to be deteriorating, the controller controls the engine to stop operating.

[0061] In one embodiment, a method for identifying catalytic degradation in a motorcycle according to any of the above embodiments includes the following steps:

[0062] Step S110: Acquire the pre-oxygen electrical signal of the pre-oxygen sensor 30 and plot the pre-oxygen electrical signal curve as the running time changes.

[0063] Step S120: Acquire the post-oxygen electrical signal of the post-oxygen sensor 40 and plot the post-oxygen electrical signal curve as the running time changes.

[0064] Step S130: Obtain the first number of reversals within a preset time period based on the pre-oxygen electrical signal curve, and obtain the second number of reversals within a preset time period based on the post-oxygen electrical signal curve.

[0065] Step S140: When the ratio of the first flip number to the second flip number is greater than a preset threshold, it is determined that the first catalyst 20 has deteriorated.

[0066] Optionally, the order of steps S110 and S120 can be interchanged or performed simultaneously, and no limitation is imposed here.

[0067] Extensive testing and research on the aforementioned motorcycle revealed that when S is set to 350mm–480mm, B to 0.8V–1.4V, and C to 1.1V–2.1V, if the first catalyst 20 does not deteriorate, the subsequent oxygen electrical signal curve is a straight line or approximately a straight line, meaning the number of reversals in the subsequent oxygen electrical signal is low, almost zero. The preceding oxygen electrical signal curve is a relatively regular S-shape, with the number of reversals gradually increasing over time, and the ratio is significantly less than a preset threshold. If the first catalyst 20 deteriorates, both the subsequent and preceding oxygen electrical signal curves are, for example, relatively regular S-shapes, with the number of reversals gradually increasing over time. Furthermore, the subsequent and preceding oxygen electrical signal curves almost overlap, and the number of reversals is almost the same, with a ratio greater than a preset threshold, indicating catalyst deterioration. Therefore, this method improves the identifiability of the first catalyst 20's deterioration and provides a high degree of accuracy in the assessment.

[0068] In one embodiment, the method for identifying catalytic degradation in motorcycles further includes:

[0069] After determining that the first catalyst 20 has deteriorated, step S150 is further included, which involves performing at least one of the following actions: light indication, voice prompt, vibration prompt, and display screen display.

[0070] In one embodiment, a computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the steps of the method of any of the above embodiments.

[0071] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0072] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0073] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0075] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0077] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A muffler for a motorcycle, characterized in that, The motorcycle's muffler includes: The muffler body has an air inlet with a pipe for communicating with the exhaust port of the engine. The first catalyst is disposed on the pipeline and is used to purify the exhaust gas discharged from the engine. An oxygen sensor is disposed on the pipeline and located upstream of the first catalyst along the airflow direction; A post-oxygen sensor is disposed on the pipeline and located downstream of the first catalyst along the airflow direction; Wherein, the distance between the central axis of the front oxygen sensor and the central axis of the rear oxygen sensor is set as S, where S is 350mm to 480mm; the volume of the first catalyst is set as B, the displacement of the engine is set as V, and the volume of the pipeline area corresponding to the central axis of the front oxygen sensor and the central axis of the rear oxygen sensor is set as C, where B is 0.8V to 1.4V and C is 1.1V to 2.1V.

2. The motorcycle muffler according to claim 1, characterized in that, S is 160mm to 170mm; B is 1V to 1.2V; C is 1.5V to 1.7V.

3. The motorcycle muffler according to claim 1, characterized in that, The pipeline includes a first connecting pipe and a second connecting pipe; one end of the first connecting pipe is connected to the exhaust port of the engine, and the other end of the first connecting pipe is connected to the first catalyst; one end of the second connecting pipe is connected to the first catalyst, and the other end of the second connecting pipe is connected to the muffler body.

4. The motorcycle muffler according to claim 3, characterized in that, The pipeline further includes a first docking member and a second docking member; the first docking member is connected between the first connecting pipe and the first catalyst, and the first docking member or the first connecting pipe is provided with a first mounting part, and the front oxygen sensor is mounted on the first mounting part; the second docking member is connected between the second connecting pipe and the first catalyst, and the second docking member or the second connecting pipe is provided with a second mounting part, and the rear oxygen sensor is mounted on the second mounting part.

5. The motorcycle muffler according to claim 1, characterized in that, The first catalyst includes a housing, a honeycomb disposed inside the housing, and a noble metal coating disposed on the outer surface of the honeycomb.

6. The muffler for a motorcycle according to any one of claims 1 to 5, characterized in that, The motorcycle's muffler also includes a second catalyst disposed on the pipeline, with the first catalyst and the second catalyst arranged sequentially along the airflow direction.

7. A motorcycle, characterized in that, The motorcycle includes a muffler as described in any one of claims 1 to 6, and the motorcycle also includes an engine and a controller, wherein the exhaust port of the engine is connected to the pipeline, and the controller is electrically connected to the engine, the front oxygen sensor and the rear oxygen sensor respectively.

8. A method for identifying catalytic degradation in a motorcycle as described in claim 7, characterized in that, The method for identifying catalytic degradation in motorcycles includes the following steps: Acquire the pre-oxygen electrical signal from the pre-oxygen sensor and plot the pre-oxygen electrical signal curve as the pre-oxygen electrical signal changes with running time; Acquire the post-oxygen electrical signal from the post-oxygen sensor and plot the post-oxygen electrical signal curve as the post-oxygen electrical signal changes with running time; The first number of reversals within a preset time period is obtained based on the pre-oxygen electrical signal curve, and the second number of reversals within a preset time period is obtained based on the post-oxygen electrical signal curve. When the ratio of the first number of flips to the second number of flips is greater than a preset threshold, it is determined that the first catalyst has deteriorated.

9. The method for identifying catalytic degradation in motorcycles according to claim 8, characterized in that, The method for identifying catalytic degradation in motorcycles also includes: After determining that the first catalyst has deteriorated, the procedure further includes performing at least one of the following actions: light indication, voice prompt, vibration prompt, and display screen display.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method of claim 8 or 9.

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