Device, method and system for detecting abnormal wear in engine cylinder

Abstract

The invention discloses a device, method and system for detecting abnormal wear in an engine cylinder, and belongs to the field of automobile engine detection.The device comprises a hollow pipeline, the first end of the pipeline is in threaded connection with an engine cylinder cover, a gas pressure gauge is installed at the end of the third end of the pipeline, and a gas flow meter is installed at the end of the second end of the pipeline; gas is introduced from the second end of the pipeline and flows out from the third end of the pipeline. The method comprises the steps that an ECU detects whether an engine operates normally or not according to the flow at a gas taking opening of a cover cap, and if the flow is negative, an alarm is triggered for reminding; after an alarm prompt is triggered, an engine ignition system is detached, and the first end of the pipeline is in threaded connection with a sparking plug threaded hole of an engine cylinder cover; gas is introduced from the second end of the pipeline, the gas pressure display number and the gas flow meter display number are obtained, and the air cylinder abrasion degree is judged. According to the method, the state of the engine cylinder is quickly and effectively distinguished under the condition that the engine is not disassembled, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile engine detection, and in particular to a device, method and system for detecting abnormal wear in an engine cylinder. Background Art

[0002] As the core assembly structure of a vehicle, the engine undergoes a series of performance and function development tests during development and production. During performance testing, hydrogen engine development often experiences knock or pre-ignition, which significantly impacts cylinder wear. This requires multiple inspections of cylinder wear and regular cylinder air tightness checks during development. In addition, cylinder wear assessments must be performed on test vehicles to ensure reliable and rigorous test data. However, disassembling a complete vehicle engine for inspection is difficult and time-consuming. This device, designed to assess cylinder wear without disassembling the engine, ensures efficient and stable testing. Summary of the Invention

[0003] The purpose of the present invention is to provide a device, method and system for detecting abnormal wear in an engine cylinder, which can quickly evaluate the degree of wear of the engine cylinder without disassembling the engine, and can quickly and effectively distinguish the status of the engine cylinder of the test vehicle, thereby greatly improving work efficiency.

[0004] The present invention provides the following solutions:

[0005] In a first aspect, the present invention provides a device for detecting abnormal wear in an engine cylinder, comprising:

[0006] The device is a hollow pipe, the first end of the pipe is screwed to the engine cylinder head, the third end of the pipe is installed with a gas pressure gauge, the second end of the pipe is installed with a gas flow meter, and the gas enters from the second end of the pipe and flows out from the third end of the pipe.

[0007] Preferably, a positioning mechanism is provided in the middle of the first end of the pipe, and the positioning mechanism is inserted into the ignition coil sheath of the engine cylinder head. The bottom of the first end of the pipe is provided with an external thread that is screwed to the spark plug threaded hole of the engine cylinder head.

[0008] Preferably, a connecting block is further provided in the middle of the first end of the pipeline and is arranged above the positioning mechanism.

[0009] In a second aspect, the present invention further describes a method for detecting abnormal wear in an engine cylinder, which is performed using the above-mentioned abnormal wear detection device in an engine cylinder, and includes the following steps:

[0010] S1: The ECU detects whether the engine is running normally based on the flow rate at the air inlet of the cover. If the flow rate is negative, an alarm is triggered;

[0011] S2: After the alarm is triggered, the engine ignition system is first dismantled and the first end of the pipe is screwed to the spark plug threaded hole of the engine cylinder head;

[0012] S3: Install a gas flow meter at the second end of the pipeline, introduce gas from the second end of the pipeline, obtain the gas pressure indication and the gas flow meter reading, and judge the degree of cylinder wear.

[0013] Preferably, obtaining the gas pressure indication and the gas flow meter indication to determine the degree of cylinder wear specifically includes:

[0014] Obtain the standard laboratory data of the engine when it leaves the factory. That is, when the gas is passed from the second end of the pipeline to the engine when it leaves the factory, when the gas pressure display shows X bar, record the gas flow meter reading Y g / s when the engine leaves the factory;

[0015] Obtain standard data for the engine when it is operating normally in the test lab at a mileage of M km. That is, introduce gas from the second end of the pipeline into the test lab engine. When the gas pressure reading is X bar, record the gas flow meter reading Z g / s when the engine is operating normally at a mileage of M km.

[0016] Obtain current test data of the engine to be tested, that is, introduce gas from the third end of the pipeline into the engine to be tested, where the mileage of the engine to be tested is less than M km, adjust the gas pressure display to X bar, and record the gas flow meter reading E g / s of the engine to be tested at this time;

[0017] Compare the sizes of E, Y and Z. If Y<E<Z, it is considered that the cylinder is in a state where it can continue to operate. Otherwise, it is considered that the cylinder of the engine to be tested is in an abnormal state with obvious cylinder wear.

[0018] Preferably, obtaining the gas pressure indication and the gas flow meter indication to determine the degree of cylinder wear specifically includes:

[0019] Obtain standard laboratory data for the engine when it leaves the factory. That is, when gas is passed from the second end of the pipeline to the engine when it leaves the factory, when the gas pressure display shows X bar, record the gas flow meter reading Ag / s when the piston ring is normally installed when the engine leaves the factory, and the gas flow meter reading B g / s when the piston ring is not properly installed when the engine leaves the factory;

[0020] Obtain standard data for the engine running normally in the test laboratory at a mileage of M km. That is, introduce gas from the second end of the pipeline into the test laboratory engine. When the gas pressure display reaches X bar, record the gas flow meter reading (C g / s) when the engine is running normally at a mileage of M km with the piston ring properly installed, and the gas flow meter reading (D g / s) when the engine is running normally at a mileage of M km with the piston ring improperly installed.

[0021] Obtain the current detection data of the engine to be detected, that is, introduce gas from the second end of the pipeline into the engine to be detected. Among them, the running mileage of the engine to be detected is less than M km. When the reading of the gas pressure gauge is adjusted to X bar, record the reading E (g / s) of the gas flowmeter of the engine to be detected at this time.

[0022] Compare the magnitudes of E with A, B, C, and D. If A < B < E < C < D, it is considered that the cylinders of the engine to be detected are in a normal state and there is no abnormal wear. If A < E < B or C < E < D, it is considered that the cylinders of the engine to be detected are in a normal state but there is wear. If E < A or D < E, it is considered that the cylinders of the engine to be detected are in an abnormal state with obvious cylinder wear.

[0023] Preferably, at least the three piston rings are provided in the spark plug threaded hole of the engine. The specific normal installation condition of the piston rings is that the openings of the piston rings are evenly spaced. The specific abnormal installation condition of the piston rings is that the openings of the piston rings are aligned.

[0024] Preferably, after the step S3, it further includes:

[0025] S4: If the cylinders of the engine are in an abnormal state, disassemble the engine to check the flatness and roundness inside the cylinder liner.

[0026] Preferably, the step S1 specifically includes:

[0027] When the engine is working normally, the ECU monitors the flow reading at the air intake port of the cover. If the flow reading is negative for 30 seconds continuously and accumulates more than three times, an alarm is triggered.

[0028] In a third aspect, the present invention discloses an in-cylinder abnormal wear detection system for an engine, including:

[0029] A monitoring module, used for the ECU to monitor whether the engine is running normally according to the flow at the air intake port of the cover. If the flow is negative, an alarm reminder is triggered;

[0030] An inspection module, used for after the alarm reminder is triggered, first remove the engine ignition system, and screw the first end of the pipeline to the spark plug threaded hole of the engine cylinder head;

[0031] A judgment module, used for installing a gas flowmeter at the second end of the pipeline, introducing gas from the third end of the pipeline, obtaining the reading of the gas pressure gauge and the reading of the gas flowmeter, and judging the degree of cylinder wear.

[0032] The present invention has the following advantages compared with the prior art:

[0033] The present invention can quickly evaluate the degree of engine cylinder wear without disassembling the engine, and can quickly and effectively distinguish the status of the engine cylinder, including: the cylinder has no abnormal wear and can continue to run, the engine piston ring has no matching phenomenon and there is almost no wear in the cylinder, the engine piston ring has no matching phenomenon and there is wear in the cylinder but the wear degree is normal, the engine may have piston ring burning and sticking, and the engine cylinder wear is abnormal, and the engine may have a cylinder scuffing failure and the engine needs to be disassembled for further precise detection, which greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 Schematic diagram of the overall structure of the abnormal wear detection device in the engine cylinder of the present invention;

[0036] Figure 2 A schematic structural diagram of a gas pressure gauge of an abnormal wear detection device in an engine cylinder according to the present invention;

[0037] Figure 3 is a flow chart of the method for detecting abnormal wear in an engine cylinder of the present invention;

[0038] Figure 4 Flowchart of step S1 of the method for detecting abnormal wear in an engine cylinder of the present invention;

[0039] Figure 5 It is a structural schematic diagram of the abnormal wear detection system in the engine cylinder of the present invention.

[0040] In the picture:

[0041] 1. First end of the pipeline; 2. Second end of the pipeline; 3. Third end of the pipeline; 4. Gas pressure gauge; 5. Positioning mechanism; 6. Connecting block; 100. Monitoring module; 200. Inspection module; 300. Judgment module. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of this application more clear, this application will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0043] The terms used in the examples of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a," "the," and "the" used in the examples of this application and the appended claims are also intended to include plural forms, and unless the context clearly indicates otherwise, "a plurality" generally includes at least two.

[0044] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0045] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0046] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0047] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.

[0048] It should be noted in particular that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0049] Example 1

[0050] See also Figure 1-2 As shown, the abnormal wear detection device in the engine cylinder provided by the embodiment of the present application includes:

[0051] The device is a hollow pipe. The first end 1 of the pipe is screwed to the engine cylinder head. A gas pressure gauge 4 is installed at the third end 3 of the pipe. A gas flow meter is installed at the second end 2 of the pipe. Gas enters from the second end 2 of the pipe and flows out from the third end 3 of the pipe.

[0052] The second end 2 of the pipeline is connected to a gas flow meter as the compressed air inlet and compressed air is continuously injected. The third end 3 of the pipeline is used as the compressed air outlet. A gas pressure gauge 4 is installed at the third end 3 of the pipeline. By observing the gas pressure display and the gas flow meter reading and comparing them with the standard data obtained in advance, the degree of cylinder wear can be determined.

[0053] See also Figure 1-2 As shown, a positioning mechanism 5 is provided in the middle of the first end of the pipe, which is inserted into the ignition coil sheath of the engine cylinder head. An external thread is provided at the bottom of the first end 1 of the pipe to be screwed to the spark plug threaded hole of the engine cylinder head.

[0054] When installing this device, first remove the hydrogen engine ignition system (ignition coil, spark plug), retain the ignition coil sheath outside the ignition coil, then insert the first end 1 of the pipe into the ignition coil sheath, and through the limiting effect of the positioning mechanism 5, make the first end 1 of the pipe perpendicular to the spark plug threaded hole, and finally screw the bottom of the first end 1 of the pipe and the spark plug threaded hole together, which can protect the cylinder head spark plug thread from damage during the installation of this device and improve the installation accuracy.

[0055] See also Figure 1-2 As shown, a connecting block 6 is further provided in the middle of the first end 1 of the pipeline, and is arranged above the positioning mechanism 5 .

[0056] The connecting block 6 is hexagonal in shape. Use a wrench or other fixture to clamp the connecting block 6 and then rotate the wrench to screw the bottom of the first end 1 of the pipe to the spark plug threaded hole of the cylinder head to prevent air leakage at the connection of the spark plug threaded hole from affecting the accuracy of the measurement results.

[0057] Furthermore, connecting a spark plug thread adapter at the bottom of the first end 1 of the pipe can adapt to engines using spark plug thread holes of different sizes, further enhancing flexibility.

[0058] Example 2

[0059] See also Figure 3-4 As shown, an embodiment of the present application provides a method for detecting abnormal wear in an engine cylinder, wherein the above-mentioned abnormal wear detection device in an engine cylinder performs detection, including the following steps:

[0060] S1: The ECU detects whether the engine is running normally based on the flow rate at the air inlet of the cover. If the flow rate is negative, an alarm is triggered;

[0061] S2: After the alarm is triggered, the hydrogen engine ignition system is first dismantled, and the first end of the pipe is screwed to the spark plug threaded hole of the engine cylinder head;

[0062] S3: Install a gas flow meter at the second end of the pipeline, introduce gas from the second end of the pipeline, obtain the gas pressure indication and the gas flow meter reading, and judge the degree of cylinder wear.

[0063] See also Figure 3-4 As shown, obtain the gas pressure indication and gas flow meter indication to determine the degree of cylinder wear, specifically including:

[0064] Obtain the standard laboratory data of the engine when it leaves the factory. That is, when the gas is passed from the second end of the pipeline to the engine when it leaves the factory, when the gas pressure display shows X bar, record the gas flow meter reading Y g / s when the engine leaves the factory;

[0065] Obtain standard data for the engine when it is operating normally in the test lab at a mileage of M km. That is, introduce gas from the second end of the pipeline into the test lab engine. When the gas pressure reading is X bar, record the gas flow meter reading Z g / s when the engine is operating normally at a mileage of M km.

[0066] Obtain current test data of the engine to be tested, that is, introduce gas from the third end of the pipeline into the engine to be tested, where the mileage of the engine to be tested is less than M km, adjust the gas pressure display to X bar, and record the gas flow meter reading E g / s of the engine to be tested at this time;

[0067] Compare the sizes of E, Y and Z. If Y<E<Z, it is considered that the cylinder is in a state where it can continue to operate. Otherwise, it is considered that the cylinder of the engine to be tested is in an abnormal state with obvious cylinder wear.

[0068] By obtaining the standard laboratory data of the engine when it leaves the factory and the standard data of the engine when it is operating normally in the laboratory at a mileage of M km, and comparing the current test data of the engine to be tested with the two, it is possible to quickly determine whether the cylinder of the engine to be tested is in an abnormal state.

[0069] See also Figure 3-4 As shown, obtain the gas pressure indication and gas flow meter indication to determine the degree of cylinder wear, specifically including:

[0070] Obtain standard laboratory data for the engine when it leaves the factory. That is, when gas is passed from the second end of the pipeline to the engine when it leaves the factory, when the gas pressure display shows X bar, record the gas flow meter reading Ag / s when the piston ring is normally installed when the engine leaves the factory, and the gas flow meter reading B g / s when the piston ring is not properly installed when the engine leaves the factory;

[0071] Obtain the standard data when the engine runs normally for M km in the test chamber, that is, introduce gas from the second end of the pipeline into the engine in the test chamber. When the reading of the gas pressure gauge is X bar, record the gas flowmeter reading C g / s when the engine runs normally for M km with the piston rings installed correctly and the gas flowmeter reading D g / s when the engine runs normally for M km with the piston rings installed incorrectly;

[0072] Obtain the current test data of the engine to be tested, that is, introduce gas from the second end of the pipeline into the engine to be tested. Among them, the running mileage of the engine to be tested is less than M km. When the reading of the gas pressure gauge is adjusted to X bar, record the gas flowmeter reading E g / s of the engine to be tested at this time;

[0073] Compare the magnitudes of E, A, B, C, and D. If A < B < E < C < D, it is considered that the cylinder of the engine to be tested is in a normal state and there is no abnormal wear. If A < E < B or C < E < D, it is considered that the cylinder of the engine to be tested is in a normal state but there is wear. If E < A or D < E, it is considered that the cylinder of the engine to be tested is in an abnormal state with obvious cylinder wear.

[0074] By obtaining the standard data of the test chamber when the engine leaves the factory, the standard data when the engine runs normally for M km in the test chamber, and further distinguishing between the correct and incorrect installation of the piston rings, and then comparing the current test data of the engine to be tested with the two, the current state of the engine to be tested can be judged more accurately. If A < B < E < C < D, it is considered that the cylinder of the engine to be tested is in a normal state and there is no abnormal wear, and it can continue to run; if A < E < B, it is considered that the piston rings of the engine do not have the phenomenon of being opposite to each other and there is almost no wear in the cylinder, and it can continue to run; if C < E < D, it is considered that the piston rings of the engine do not have the situation of being opposite to each other, there is wear in the cylinder, but the wear degree is normal, and it can continue to run; if E < A, it is considered that the engine may have the phenomenon of piston ring ablation and jamming, and is in an abnormal state and cannot continue to run; if D < E, it is considered that the cylinder of the engine is abnormally worn, and the engine may have a cylinder pulling fault and cannot continue to run. Further accurate detection by disassembling the machine is required later.

[0075] See Figure 3-4 As shown, there are at least three piston rings in the spark plug threaded hole of the engine. The correct installation of the piston rings specifically means that the openings of the piston rings are evenly spaced; the incorrect installation of the piston rings specifically means that the openings of the piston rings are aligned.

[0076] In this embodiment, three piston rings are arranged in the spark plug threaded hole and are in a stacked state. Each piston ring is provided with an opening. The normal installation condition of the piston rings is that the openings of the three piston rings are evenly spaced, that is, the openings of adjacent piston rings are spaced 120° apart. The abnormal installation condition of the piston rings is that the openings of the three piston rings are aligned and the three openings are on the same straight line.

[0077] See also Figure 3-4 As shown, after step S3, it also includes:

[0078] S4: If the engine cylinder is in an abnormal state, disassemble the engine and check the internal flatness and roundness of the cylinder liner.

[0079] When it is determined that the engine cylinder is in an abnormal state, disassemble the machine for inspection to improve work efficiency.

[0080] See also Figure 3-4 As shown, step S1 specifically includes:

[0081] When the engine is operating normally, the ECU monitors the flow reading at the air inlet of the cover. If the flow reading is negative for 30 seconds and more than three times in total, an alarm is triggered.

[0082] When the engine is operating normally, the engine ECU receives the flow reading at the air inlet of the cover to determine whether the engine is operating normally. When the flow read by the ECU is negative and lasts for 30 seconds, it counts once. When it accumulates 3 times or more, an alarm is triggered. The engine may have faults such as cylinder scuffing or bearing seizure, which will cause increased leakage. It is necessary to use the detection device and detection method of the present invention to detect and determine the problem.

[0083] Example 3

[0084] For example, when a hydrogen engine leaves the factory: 1. When the piston ring is installed normally, use this device to measure, continuously inject compressed air, the gas pressure display number is 3bar, and the gas flow meter reading is 4.5g / s; 2. When the piston ring is installed abnormally, use this device to measure, continuously inject compressed air, the gas pressure display number is 3bar, and the gas flow meter reading is 6g / s;

[0085] When the hydrogen engine is operating normally in the test laboratory (without abnormal wear) for 233,000 km: 1. When the piston ring is installed normally, use this device to measure, continuously inject compressed air, the gas pressure display number is 3 bar, and the gas flow meter reading is 7 g / s; 2. When the piston ring is installed abnormally, use this device to measure, continuously inject compressed air, the gas pressure display number is 3 bar, and the gas flow meter reading is 7.5 g / s;

[0086] At this time, when the mileage of the test vehicle's hydrogen engine is less than the laboratory conversion mileage of 233,000 km, use this device to measure, continuously inject compressed air, control the gas pressure display number to 3 bar, and the gas flow meter reading is 6.5g / s. Since 4.5<6<6.5<7<7.5, it can be preliminarily determined that the test vehicle's engine cylinder has no abnormal wear and can continue to run; when the gas flow meter reading is 5.4g / s, and the situation of 4.5<5.4<6 occurs, it is believed that the engine piston ring is not aligned and there is almost no wear in the cylinder at this time; when the gas flow meter reading is 7.2g / s, and the situation of 7.5<7<7.5 occurs, it is believed that the engine piston ring is not aligned and there is almost no wear in the cylinder; when the gas flow meter reading is 7.2g / s, and the situation of 7.5<7<7.5 occurs, it is believed that the engine piston ring is not aligned and there is almost no wear in the cylinder; when the gas flow meter reading is 7.5g / s, and the situation of 7.5<7<7.5 occurs, it is believed that the engine cylinder has no abnormal wear and can continue to run; when the gas flow meter reading is 5.4g / s, and the situation of 4.5<5.4<6 occurs, it is believed that the engine piston ring is not aligned and there is almost no wear in the cylinder; when the gas flow meter reading is 7.5g / s, and the situation of 7.5<7<7.5 ... cylinder has no abnormal wear and can continue to run; when the gas flow meter reading is 7.5g / s, and the situation of 7.5<7<7.5 occurs, it is believed When the reading is <7.2<7.5, it can be considered that the engine piston ring is not aligned and there is wear in the cylinder, but the degree of wear is normal; when the gas flow meter reading is 3g / s or less, and is less than 4.5, the engine may have piston ring burning and sticking, and is in an abnormal state. The machine needs to be disassembled for further precise testing to determine the specific problem; when the gas flow meter reading is 10g / s, and 10>7.5, it proves that the engine cylinder wear is abnormal, and the engine may have a cylinder scuffing failure, and the machine needs to be disassembled for further precise testing to determine the specific problem.

[0087] Example 4

[0088] See also Figure 5 As shown, an embodiment of the present application provides a system for detecting abnormal wear in an engine cylinder, comprising:

[0089] The monitoring module 100 is used by the ECU to monitor whether the engine is running normally according to the flow rate at the air inlet of the cover, and trigger an alarm if the flow rate is negative;

[0090] The inspection module 200 is used to, after triggering the alarm, first dismantle the engine ignition system and screw the first end of the pipe to the spark plug threaded hole of the engine cylinder head;

[0091] The judgment module 300 is used to install a gas flow meter at the second end of the pipeline, pass gas from the third end of the pipeline, obtain the gas pressure indication and the gas flow meter indication, and judge the degree of cylinder wear.

[0092] The working process of the present invention is:

[0093] When the engine is operating normally, the engine ECU receives the flow reading at the air inlet of the cover to determine whether the engine is operating normally. When the ECU reads a negative flow and triggers an alarm, the engine may have faults such as cylinder scuffing or bearing seizure, resulting in increased leakage. When going to the service station for inspection, first remove the hydrogen engine ignition system, put the cylinder in a shutdown state, and close the intake and exhaust valves at the same time. Insert the first end 1 of the pipe of this detection device into the ignition coil sheath so that the bottom of the first end of the pipe is perpendicular to the spark plug threaded hole of the cylinder head and screwed in to avoid air leakage at the spark plug threaded hole affecting the accuracy of the measurement results. Install the gas pressure gauge at the third end 3 of the pipe, connect the gas flow meter to the second end 2 of the pipe, use the second end 2 of the pipe as the compressed air inlet and continuously inject compressed air. At this time, observe the pressure indication 4 and the gas flow meter reading and compare them with the standard data to determine the degree of cylinder wear.

[0094] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. References to the common and similar parts between the various embodiments will be sufficient. For the systems or devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, their descriptions are relatively simple; for relevant details, refer to the descriptions of the methods.

[0095] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for detecting abnormal wear in an engine cylinder, characterized in that: The device is a hollow pipe, wherein the first end (1) of the pipe is screwed to the engine cylinder head, the third end (3) of the pipe is installed with a gas pressure gauge (4), and the second end (2) of the pipe is installed with a gas flow meter, and gas enters from the second end (2) of the pipe and flows out from the third end (3) of the pipe.

2. The abnormal wear detection device in the engine cylinder according to claim 1, characterized in that: A positioning mechanism (5) is provided in the middle of the first end of the pipe, and the positioning mechanism (5) is inserted into the ignition coil sheath of the engine cylinder head. The bottom of the first end (1) of the pipe is provided with an external thread that is screwed to the spark plug threaded hole of the engine cylinder head.

3. The abnormal wear detection device in the engine cylinder according to claim 2, characterized in that: A connecting block (6) is also provided in the middle of the first end (1) of the pipeline and is arranged above the positioning mechanism (5).

4. A method for detecting abnormal wear in an engine cylinder, using the abnormal wear detection device for an engine cylinder according to any one of claims 1 to 3, characterized in that: The steps include: S1: The ECU detects whether the engine is running normally based on the flow rate at the air inlet of the cover. If the flow rate is negative, an alarm is triggered; S2: After the alarm is triggered, the engine ignition system is first dismantled and the first end of the pipe is screwed to the spark plug threaded hole of the engine cylinder head; S3: Install a gas flow meter at the second end of the pipeline, introduce gas from the second end of the pipeline, obtain the gas pressure indication and the gas flow meter reading, and judge the degree of cylinder wear.

5. The method for detecting abnormal wear in an engine cylinder according to claim 4, characterized in that: The method of obtaining the gas pressure indication and the gas flow meter indication to judge the degree of cylinder wear specifically includes: Obtain the standard laboratory data of the engine when it leaves the factory. That is, when the gas is passed from the second end of the pipeline to the engine when it leaves the factory, when the gas pressure display shows X bar, record the gas flow meter reading Y g / s when the engine leaves the factory; Obtain standard data for the engine when it is operating normally in the test lab at a mileage of M km. That is, introduce gas from the second end of the pipeline into the test lab engine. When the gas pressure reading is X bar, record the gas flow meter reading Z g / s when the engine is operating normally at a mileage of M km. Obtain current test data of the engine to be tested, that is, introduce gas from the third end of the pipeline into the engine to be tested, where the mileage of the engine to be tested is less than M km, adjust the gas pressure display to X bar, and record the gas flow meter reading E g / s of the engine to be tested at this time; Compare the sizes of E, Y and Z. If Y<E<Z, it is considered that the cylinder is in a state where it can continue to operate. Otherwise, it is considered that the cylinder of the engine to be tested is in an abnormal state with obvious cylinder wear.

6. The method for detecting abnormal wear in an engine cylinder according to claim 4, characterized in that: The method of obtaining the gas pressure indication and the gas flow meter indication to judge the degree of cylinder wear specifically includes: Obtain standard laboratory data for the engine when it leaves the factory. That is, when gas is passed from the second end of the pipeline to the engine when it leaves the factory, when the gas pressure display shows X bar, record the gas flow meter reading Ag / s when the piston ring is normally installed when the engine leaves the factory, and the gas flow meter reading B g / s when the piston ring is not properly installed when the engine leaves the factory; Obtain the standard data when the engine runs normally for M km in the test chamber. That is, introduce gas from the second end of the pipeline into the engine in the test chamber. When the gas pressure gauge shows X bar, record the gas flowmeter reading C g / s when the piston rings are installed normally and the engine runs normally for M km, and the gas flowmeter reading D g / s when the piston rings are installed abnormally and the engine runs normally for M km. Obtain the current test data of the engine to be tested. That is, introduce gas from the second end of the pipeline into the engine to be tested. Among them, the running mileage of the engine to be tested is less than M km. When the gas pressure gauge reading is adjusted to X bar, record the gas flowmeter reading E g / s of the engine to be tested at this time. Compare the magnitudes of E, A, B, C, and D. If A < B < E < C < D, it is considered that the cylinder of the engine to be tested is in a normal state and there is no abnormal wear. If A < E < B or C < E < D, it is considered that the cylinder of the engine to be tested is in a normal state but there is wear. If E < A or D < E, it is considered that the cylinder of the engine to be tested is in an abnormal state and there is obvious cylinder wear.

7. The method for detecting abnormal wear in an engine cylinder according to claim 6, characterized in that: At least three of the piston rings are provided in the spark plug threaded hole of the engine. The specific normal installation condition of the piston rings is that the openings of the piston rings are evenly spaced. The specific abnormal installation condition of the piston rings is that the openings of the piston rings are aligned.

8. The method for detecting abnormal wear in an engine cylinder according to claim 4, characterized in that: After the step S3, it further includes: S4: If the cylinder of the engine is in an abnormal state, disassemble the engine to check the flatness and roundness of the inner part of the cylinder liner.

9. The method for detecting abnormal wear in an engine cylinder according to claim 4, wherein: The step S1 specifically includes: When the engine is working normally, the ECU monitors the flow reading at the air intake port of the cover. If the flow reading is negative for 30 seconds continuously and accumulates more than three times, an alarm is triggered.

10. An abnormal wear detection system in an engine cylinder, characterized in that: It includes: A monitoring module (100), used for the ECU to monitor whether the engine is running normally according to the flow at the air intake port of the cover. If the flow is negative, an alarm reminder is triggered. An inspection module (200), used for after the alarm reminder is triggered, first remove the engine ignition system, and screw the first end of the pipeline to the spark plug threaded hole of the engine cylinder head. A judgment module (300), used for installing a gas flowmeter at the second end of the pipeline, introducing gas from the third end of the pipeline, obtaining the gas pressure gauge reading and the gas flowmeter reading, and judging the degree of cylinder wear.

Images