Engine pedestal system for detecting abnormal sound of engine

Abstract

The utility model discloses a system for detecting abnormal sound of an engine by an engine pedestal, which belongs to the technical field of engines, and comprises a microphone, a sound sensor, an engine working parameter detection sensor and a channel acquisition case which are arranged on the engine, the microphone is used for detecting the sound of the engine moving part; the microphone and the sound sensor are respectively connected to the channel acquisition case through data lines, the engine working parameter detection sensor is connected to an engine pedestal through a data line, and the channel acquisition case is connected to the engine pedestal through a Can signal line; the engine pedestal comprises a main controller, a sound detection feedback unit is integrated in the main controller, and the sound detection feedback unit is used for processing detection data of a microphone, a sound sensor and an engine working parameter detection sensor and giving engine abnormal sound feedback. The system can timely judge the abnormal sound of the engine from the outside of a test room and stop the rack and the engine, and accurately recognize the part with the abnormal sound at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a system for detecting abnormal engine noises on an engine test bench. Background Technique

[0002] After the engine is assembled, tests are required to verify whether the design of engine components can meet the design requirements. During the operation of the test bench, in order to detect whether the engine is running normally, it is necessary to listen to whether there are abnormal noises in the engine during operation. If abnormal noises occur, the emergency stop button needs to be manually pressed to terminate the test.

[0003] Defects and deficiencies of the prior art:

[0004] 1. Since the test bench needs to meet the test and safety requirements, sound-absorbing materials are used in the test room to simulate the theoretical environment, and the glass and doors are designed with sufficient strength to prevent parts from flying out. Therefore, during the test process, the tester cannot clearly hear the engine sound outside the test room. If it is necessary to determine whether there are abnormal noises in the engine, the explosion-proof door of the test room must be opened to listen to the sound, which violates the safety code requirements and poses a certain safety risk.

[0005] 2. When abnormal noises occur in the engine, it is necessary to stop immediately. However, since the test room is in a sealed state, it is currently impossible to determine whether the engine is abnormal based on the abnormal noise situation. Only when the relevant detection data exceeds the specified value, an alarm is issued, or an emergency stop is carried out after the engine parts break and fly out. But at this time, some engine parts may have been damaged, and it is impossible to stop losses in time before the parts are damaged, nor can the specific location of the first damaged part of the engine be accurately analyzed. Content of the Utility Model

[0006] The purpose of the utility model is to overcome the technical problems existing in the engine test in the prior art, and provides a system for detecting abnormal engine noises on an engine test bench.

[0007] The purpose of the utility model is achieved by the following technical solutions:

[0008] Provide a system for detecting abnormal engine noises on an engine test bench. The system includes a microphone, a sound sensor, an engine operating parameter detection sensor and a channel acquisition chassis arranged on the engine. Among them, the sound sensor is used to detect the ambient sound in the test room, and the microphone is used to detect the sound of the engine moving parts; the microphone and the sound sensor are respectively connected to the channel acquisition chassis through data lines, the engine operating parameter detection sensor is connected to the engine test bench through a data line, and the channel acquisition chassis is connected to the engine test bench through a Can signal line;

[0009] The engine test bench includes a main controller, and a sound detection and feedback unit is integrated in the main controller. The sound detection and feedback unit is used to process the detection data of a microphone, a sound sensor, and an engine operating parameter detection sensor, and give an engine abnormal sound feedback.

[0010] In some embodiments, the system further includes an alarm for giving abnormal prompts, and the alarm is connected to the main controller.

[0011] In some embodiments, the engine operating parameter detection sensors include a pressure sensor, a temperature sensor, and a voltage sensor.

[0012] In some embodiments, the system further includes a display, and the display is connected to the main controller.

[0013] Preferably, the microphone is a dynamic microphone, and the sound sensor is a condenser microphone.

[0014] It should be further noted that the technical features corresponding to the above system options can be combined or replaced with each other to form a new technical solution.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] (1) The system detects the ambient sound in the test room during the operation of the engine through the sound sensor, and the external engine test bench judges whether the detection data of the sound sensor is within the sound signal frequency spectrum range under normal engine operation through the sound detection and feedback unit, so as to be able to judge the abnormal sound of the engine in time from outside the test room and stop the test bench and the engine; in addition, the sound of the engine moving parts is detected through the microphone to accurately identify the parts where the abnormal sound occurs, and at the same time, the abnormal sound situation not generated by the engine can be excluded through the microphone, thereby reducing false alarm information. In short, it solves the safety hazard brought by opening the sealed test room during the test process to detect the abnormal sound of the engine, prevents the parts from flying out when the engine is damaged, and prevents the technicians in the test room from being injured by the unsealed parts. It avoids the situation that the technician does not find the abnormal sound when the engine in the test room is damaged and does not stop the test bench immediately. The test bench can stop checking the engine condition immediately through the abnormal sound and abnormal data when the engine is damaged, so as to more accurately lock the cause of the engine damage.

[0017] (2) In one example, the system detects other signals except sound through the engine operating parameter detection sensors, and can check the abnormal sound situation caused by external factors of the engine, further improving the accuracy of engine abnormal sound judgment.

[0018] (3) In one example, the sound detection feedback unit has a learning feedback function. By continuously learning the spectral fluctuations of the normal operating sound within the normal detection range of the engine in the early stage, the spectral range of the normal operating sound of the engine can be continuously improved, which can greatly improve the accuracy of monitoring and reduce the workload of technicians in the later stage.

[0019] (4) In one example, the alarm can promptly and prominently remind the technician of abnormal engine noises, further ensuring the stability of the system.

[0020] (5) In one example, the monitor can visually display the detection signals and monitoring situations, facilitating the technician to view and analyze. Description of the Drawings

[0021] Figure 1 Schematic diagram of a system for detecting abnormal engine noises on an engine test bench shown in an embodiment of the present utility model;

[0022] Figure 2 Hardware structure diagram shown in an embodiment of the present utility model;

[0023] Figure 3 Schematic diagram of the detection process shown in an embodiment of the present utility model. Detailed Embodiments

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0026] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] Refer to Figure 1 - Figure 2, in an exemplary embodiment, a system for detecting abnormal engine noises on an engine test bench is provided. The system includes a microphone, a sound sensor, an engine operating parameter detection sensor, and a channel acquisition chassis disposed on the engine. Among them, the sound sensor is used to detect the ambient sound in the laboratory, and the microphone is used to detect the sound of the engine moving parts; the microphone and the sound sensor are respectively connected to the channel acquisition chassis through data lines, the engine operating parameter detection sensor is connected to the engine test bench through a data line, and the channel acquisition chassis is connected to the engine test bench through a Can signal line;

[0028] The engine test bench includes a main controller, and a sound detection and feedback unit is integrated in the main controller. The sound detection and feedback unit is used to process the detection data of the microphone, the sound sensor, and the engine operating parameter detection sensor, and give an abnormal engine sound feedback.

[0029] The microphone and the sound sensor are connected to the channel acquisition chassis, and the sound during the engine test process is transmitted to the main controller of the external engine test bench. Among them, the main controller includes a computer, etc. The Can signal line connects the test bench and the channel acquisition chassis, and connects the sound signal to the test bench. An alarm program is set on the main controller of the test bench, and the sound signal spectrum under normal engine operation is set and compared with the sound during engine operation to learn the spectrum fluctuation of the engine under normal conditions.

[0030] Specifically, the function of the sound sensor is mainly to detect sound signals from the test room environment, including the sound when the engine is running and the sound generated by non-engine operation, convert the sound signal into an electrical signal, and output it to the channel acquisition chassis. The channel acquisition chassis and the sound detection feedback unit are connected together with a Can signal line, and the electrical signal obtained by the sound sensor is analyzed and converted into a corresponding spectrum image in the detection software. The microphone outputs the sound inside the engine through the channel acquisition chassis, and the technician can monitor the abnormal sound of the engine moving parts (such as the crank connecting rod mechanism and the valve mechanism, etc.). The channel acquisition chassis is used to process various models collected by each sensor, and is connected to the sound detection feedback unit in the main controller through the Can signal line to convert the electrical signal of the microphone into the sound pressure spectrum image in the detection software. The sound sensor and the microphone output signals at the same time, which can correspond the laboratory sound when the engine is running to the spectrum image in the sound detection feedback unit in real time. The technician can identify the abnormal sound of the engine transmitted by the microphone, and at the same time view the spectrum image of the detection software at this time, so as to set the abnormal sound alarm range. When the engine is running, if the parts are abnormal at high speed and produce abnormal noises, loud or frequent, and the spectrum peak or change comment exceeds the normal range, the test bench will alarm and record real-time data. It can also detect the sound of the engine moving parts through the microphone, accurately identify the parts that produce abnormal noises, and exclude abnormal noises that are not produced by the engine through the microphone, thereby reducing false alarm information and facilitating the recording of the normal sound spectrum change range.

[0031] Furthermore, the engine operating parameter detection sensors include pressure sensors, temperature sensors, voltage sensors and other sensors, which can detect oil channel temperature and pressure, intake and exhaust temperature and pressure, inlet and outlet water temperature and pressure, vibration, voltage and other data when the engine is running.

[0032] The specific workflow of the system is as follows: Figure 3 As shown, when the working parameter detection data of the engine test bench, such as the oil channel temperature and pressure, intake and exhaust temperature and pressure, inlet and outlet water temperature and pressure, vibration, voltage and other data and sounds during engine operation are abnormal, the engine test bench records the current situation and automatically stops immediately, and the technician checks the engine; when the sound is abnormal and the working parameter detection data is normal, the engine test bench records the situation and alarms, and the technician checks the abnormal sound caused by external factors of the engine. If there is no abnormality, the alarm is lifted and the test is continued when the sound is recorded within the normal sound spectrum change range.

[0033] In some examples, the system further includes an alarm for abnormal prompting, the alarm being connected to the main controller. The alarm can promptly and conspicuously remind the technician of abnormal engine noise, further ensuring the stability of the system.

[0034] In some other examples, the system further includes a display, which is connected to the main controller. Through the display, the detection signal and the monitoring situation can be intuitively displayed, facilitating technicians to view and analyze.

[0035] In some other examples, the microphone is an electrodynamic microphone or other types of sensors that can implement the sound detection function of the present application. Among them, the electrodynamic microphone has low inherent noise and is suitable for high and low temperature environments; the sound sensor can adopt a condenser microphone, which has good sensitivity, high stability, and a wide detection range; the engine operating parameter detection sensor is a conventional pressure sensor, temperature sensor, etc., which will not be elaborated here.

[0036] The above specific embodiments are detailed descriptions of the present invention. It cannot be determined that the specific embodiments of the present invention are only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions and substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A system for detecting abnormal engine noise on an engine bench, characterized in that: The system includes a microphone, a sound sensor, an engine operating parameter detection sensor and a channel acquisition chassis arranged on the engine, wherein the sound sensor is used to detect the ambient sound in the test room, and the microphone is used to detect the sound of the engine moving parts; the microphone and the sound sensor are respectively connected to the channel acquisition chassis through data lines, the engine operating parameter detection sensor is connected to the engine test bench through the data line, and the channel acquisition chassis is connected to the engine test bench through the Can signal line; The engine test bench includes a main controller, in which a sound detection feedback unit is integrated. The sound detection feedback unit is used to process detection data of a microphone, a sound sensor and an engine operating parameter detection sensor, and to provide abnormal engine sound feedback.

2. A system for detecting abnormal engine noise using an engine bench according to claim 1, characterized in that: It also includes an alarm for abnormal prompting, and the alarm is connected to the main controller.

3. The system for detecting abnormal engine noise using an engine bench according to claim 1, characterized in that: The engine operating parameter detection sensor includes a pressure sensor, a temperature sensor and a voltage sensor.

4. The system for detecting abnormal engine noise using an engine stand according to claim 1, characterized in that: A display is also included, and the display is connected to the main controller.

5. The system for detecting abnormal engine noise using an engine bench according to claim 1, characterized in that: The microphone is an electrodynamic microphone.

6. The system for detecting abnormal engine noise using an engine bench according to claim 1, characterized in that: The sound sensor is a capacitive microphone.

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