Motor vehicle engine exhaust port airflow angle measuring instrument

Abstract

The application discloses a kind of motor vehicle engine exhaust pipe orifice airflow angle measuring instruments, comprising: level ruler, aperture rod, digital angle sensor and display unit;Level ruler and aperture rod are connected by hinged structure at respective one end, and the free end of aperture rod is circular table structure;Hinged structure is provided with the digital angle sensor of the included angle between level ruler and aperture rod;Level ruler is provided with level gauge;Circular table structure can be inserted and adhere to the inner wall of engine exhaust pipe orifice self-adaptation;Display unit, with digital angle sensor electric connection, receive the included angle data measured by digital angle sensor and display.The application can quickly, accurately self-adapt to different sizes of exhaust pipe orifice, and accurately position center axis, effectively solve the alignment deviation problem caused by the traditional rigid tool due to the inability to adapt to various pipe orifice structures.

Description

Technical Field

[0001] This application relates to an airflow measuring device for engine exhaust pipe outlets, specifically to an airflow angle measuring instrument for motor vehicle engine exhaust pipe outlets. Background Technology

[0002] In the field of motor vehicle exhaust pipe design and testing, the "Technical Conditions for Safe Operation of Motor Vehicles" (GB 7258-2017) clearly stipulates that: the exhaust pipe outlet of a motor vehicle engine must not point to the right side of the vehicle body (if structural limitations necessitate it to be offset to the right, the angle between the airflow direction and the longitudinal center plane must be ≤15°), and when the exhaust pipe outlet is pointing downwards, the angle with the horizontal plane must not exceed 45°. Figure 1 As shown, the vehicle's exhaust pipe 60 is connected to the muffler 50, and the angle between the centerline of the exhaust pipe 60 and the parallel line 42 of the vehicle's longitudinal centerline 41 needs to be ≤15°. Figure 2 As shown, when the exhaust pipe 60 of a vehicle is pointing downwards, the angle between the center line of the exhaust pipe 60 and the parallel line 43 to the ground is ≤45°. The above standard imposes strict requirements on the geometric angle of the exhaust pipe 60 of a vehicle to avoid corrosive damage to the vehicle body caused by exhaust emissions, reduce dust pollution, and ensure the effective implementation of environmental regulations.

[0003] How to overcome the significant shortcomings of existing measuring tools: First, they are difficult to fit snugly against the exhaust pipe opening, leading to deviations in the central axis positioning and distorted measurement data; second, they rely on manual visual reading of the angle, which is easily affected by factors such as ambient light and operator experience, resulting in large errors; third, they lack real-time dynamic monitoring capabilities and cannot meet the quantitative requirements of regulations for the accuracy of the included angle (such as ≤15° or ≤45°). Especially in the scenarios of parallel import vehicle registration and environmental testing, the compliance verification of the exhaust pipe opening angle needs to balance the adaptability to multiple vehicle models and the demand for high-precision measurement. Traditional tools are difficult to balance flexibility and accuracy. Therefore, there is an urgent need for a dedicated measuring device that can adapt to the shape of the exhaust pipe opening, accurately determine the central axis, and display the airflow direction angle in real time. This would address the shortcomings of existing technologies in terms of structural adaptability, measurement accuracy, and ease of operation, thereby effectively ensuring that the design of motor vehicle exhaust systems complies with national standards and improving the efficiency of vehicle inspection and environmental enforcement. Utility Model Content

[0004] In view of this, the present application aims to provide a motor vehicle engine exhaust pipe outlet airflow angle measuring instrument to at least solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: This application provides a motor vehicle engine exhaust pipe outlet airflow angle measuring instrument, including a horizontal ruler, an aperture rod, a digital angle sensor, and a display unit; one end of the horizontal ruler and the aperture rod are connected by a hinge structure, and the free end of the aperture rod is a frustum structure; a digital angle sensor for measuring the angle between the horizontal ruler and the aperture rod is provided at the hinge structure. A level is installed on the horizontal ruler rod; the truncated cone structure can adaptively insert into and fit against the inner wall of the engine exhaust pipe. The display unit is electrically connected to the digital angle sensor, receives the included angle data measured by the digital angle sensor, and displays it.

[0006] In the above scheme, the taper of the frustum structure is adapted to the inner diameter range of the vehicle exhaust pipe outlet; the diameter range of the cross-sections at the upper and lower ends of the frustum structure is... 40mm to 130mm.

[0007] In the above scheme, the material of the frustum structure is a high-temperature resistant material, and the high-temperature resistant material can withstand temperatures greater than 600℃.

[0008] In the above scheme, the two ends of the frustum structure are provided with chamfered structures.

[0009] In the above scheme, the length of the horizontal ruler rod is greater than the length of the aperture rod, and the horizontal ruler rod is provided with a horizontal reference mark line.

[0010] In the above scheme, the length ratio of the horizontal ruler rod to the aperture rod is 1.2:1.

[0011] In the above scheme, the hinge structure includes a pin; The digital angle sensor is sleeved on the outer periphery of the pin and can synchronously collect angle signals as the aperture rod rotates relative to the horizontal ruler rod.

[0012] The airflow angle measuring instrument for motor vehicle engine exhaust pipe openings in this application, through its conical frustum structure and circumferential scale design, can quickly and accurately adapt to exhaust pipe openings of different sizes and precisely locate their central axis. This effectively solves the alignment deviation problem caused by the inability of traditional rigid tools to adapt to diverse pipe opening structures. The use of a high-precision digital angle sensor for angle measurement reduces errors caused by traditional manual visual readings, ensuring that the measurement results meet the precise testing requirements of national standards, reducing human error, and improving the authority and efficiency of law enforcement and inspection. Attached Figure Description

[0013] Figure 1This is a schematic diagram showing the angle between the airflow direction at the exhaust pipe outlet of a motor vehicle engine and the longitudinal center plane. Figure 2 A schematic diagram showing the angle between the airflow direction at the exhaust pipe outlet of a motor vehicle engine and the horizontal plane; Figure 3 This is a schematic diagram of the airflow angle measuring instrument for the exhaust pipe of a motor vehicle engine, according to an embodiment of this application. Detailed Implementation

[0014] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] The specific technical features described in the various embodiments in the detailed implementation can be combined in various ways without contradiction. For example, different implementation methods can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0016] It should be noted that the terms "first," "second," and "third" used in the embodiments of this application are merely to distinguish similar objects and do not represent a specific order of objects. It is understood that "first," "second," and "third" can be interchanged in a specific order or sequence where permitted. It should be understood that the objects distinguished by "first," "second," and "third" can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein.

[0017] This application describes a motor vehicle engine exhaust pipe outlet airflow angle measuring instrument, aiming to solve the problems of insufficient measurement accuracy, poor adaptability to exhaust pipe outlets, and low operating efficiency in the prior art. This angle measuring instrument adopts an integrated design, combining a high-precision sensor and an adaptive positioning structure to achieve rapid and accurate measurement of the airflow angle at the motor vehicle engine exhaust pipe outlet. The motor vehicle engine exhaust pipe outlet airflow angle measuring instrument of this application adopts a hinged double-rod structure, consisting of a horizontal ruler rod and a bore rod hinged together by a high-precision shaft pin, forming a measuring arm that can rotate from 0° to 120°, ensuring that the measurement range meets the detection requirements of the exhaust pipe outlet airflow angle and is flexible and convenient.

[0018] Figure 3 This is a schematic diagram of the structure of the airflow angle measuring instrument at the exhaust pipe of a motor vehicle engine according to an embodiment of this application, as shown below. Figure 3As shown, the angle measuring instrument of this embodiment includes a level rod 10 and an aperture rod 20. One end of each of the level rod 10 and the aperture rod 20 is hinged together by a high-precision pivot pin 30. The level rod 10 has a built-in level 11 to determine the horizontal reference plane. The level 11 can be, for example, a bubble level or an electronic level, which can establish an accurate horizontal reference plane during measurement. The free end of the aperture rod 20 is a frustum structure. The outer surface of the frustum structure is marked with circumferential graduations. The taper of the frustum structure can adapt to common exhaust pipe inlet diameters, and can adaptively fit the inner wall of the inlet to position the central axis of the exhaust pipe. When the frustum structure of this embodiment is placed in the exhaust pipe of a vehicle, by positioning the frustum structure at the outer opening of the exhaust pipe, the centerline of the exhaust pipe can be determined, thereby allowing the measurement of the relevant angle of the exhaust pipe's airflow. The frustum structure design of the aperture rod 20 allows it to adapt to exhaust pipe inlets of different sizes, and the circumferential graduations facilitate precise alignment with the outer edge of the exhaust pipe inlet, ensuring accurate positioning of the exhaust pipe's central axis.

[0019] In this embodiment, the length of the horizontal ruler 10 is greater than the length of the aperture rod 20. Both the horizontal ruler 10 and the aperture rod 20 are made of lightweight, high-strength materials to reduce overall weight and facilitate handheld operation. As an example, the lightweight, high-strength material can be aluminum alloy or carbon fiber composite material, etc.

[0020] A digital angle sensor (not shown in the figure) and a display unit 40 are installed at the hinge joint between the horizontal ruler 10 and the aperture rod 20. The angle sensor and the display unit 40 are electrically connected. The display unit 40 can receive the included angle data measured by the digital angle sensor in real time and display the included angle data measured by the digital angle sensor. The display unit 40 can integrate a signal processing module to convert the raw signal of the digital angle sensor into an intuitive angle value signal. In this embodiment of the application, the display unit 40 can also display preset standard angle thresholds, such as 15° and 45° as specified in GB7258-2017, and use colors such as green, yellow, and red backlighting or icons to compare the real-time measurement value with the standard threshold and provide intuitive judgment on whether the measurement result is compliant.

[0021] In this embodiment, the hinge structure includes a pin; a digital angle sensor is sleeved on the outer periphery of the pin and can synchronously acquire angle signals as the aperture rod 20 rotates relative to the horizontal ruler rod 10.

[0022] In this embodiment, the digital angle sensor employs a magnetoelectric measurement principle, achieving an accuracy of ±0.1°, a measurement range of 0°-120°, and a sampling frequency of 10Hz. The digital angle sensor is coaxially mounted with a hinge structure via a pin 30, and is sleeved on the outer periphery of the pin 30. The display unit can be an OLED display screen, integrating a signal processing module to display real-time angle values, horizontal reference status, and comparison indicators of GB7258-2017 standard thresholds (15°, 45°). The angle measuring instrument in this embodiment also includes a Bluetooth data transmission module (BLE 5.0), which can synchronize measurement data to a mobile terminal and support the archiving and export of detection records.

[0023] In this embodiment, the frustum structure is made of a high-temperature resistant material, capable of withstanding temperatures not lower than 600°C, to adapt to the high-temperature environment of the engine exhaust pipe. The edges of the two contact ends of the frustum structure are rounded (e.g., R=2mm) to avoid scratching the exhaust pipe. The high-temperature resistant material includes high-temperature ceramics, special high-temperature alloys, etc.

[0024] In this embodiment of the application, both the horizontal ruler rod 10 and the aperture rod 20 are made of lightweight, high-strength materials, with a rod length ratio of 1.2:1. For example, the horizontal ruler rod is 240mm long, the aperture rod is 200mm long, and the overall weight is ≤500g.

[0025] The level rod 10 in this embodiment incorporates a dual level calibration device, including a level 11 and a vertical calibrator 12. The level 11 and vertical calibrator 12 are used to dually determine the level standard of the level rod 10. The level 11 and vertical calibrator 12 have accuracies of ±0.5° and ±0.05° respectively, providing a reliable reference for measurement. The frustum structure design of the aperture rod 20 allows it to adapt to exhaust pipe openings of different sizes, and the circumferential scale lines facilitate precise alignment with the outer edge of the exhaust pipe opening, ensuring accurate positioning of the central axis. A high-precision digital angle sensor is integrated at the hinge, with a response time ≤0.5 seconds, significantly improving measurement accuracy and speed. The intelligent display and processing module uses an OLED display screen 40 with an integrated processor, providing functions such as real-time display of the included angle, standard threshold comparison, and data storage, meeting the requirements of GB7258-2017 standard for the airflow angle of the exhaust pipe opening.

[0026] The level rod described in this application embodiment preferably has a level reference marking line on its surface, forming a dual level verification mechanism with the built-in level, further improving the accuracy of the reference.

[0027] The contact end of the bore rod is designed as a frustum structure. The taper of this frustum structure is designed to accommodate the range of inner diameters of common flat-mouth engine exhaust pipes (e.g., 40mm to The diameter is 130mm, allowing it to adaptively insert into and conform to the inner wall of exhaust pipe openings of different diameters. The outer surface of the frustum structure is marked with circumferential scale lines. During measurement, by rotating the aperture rod to align the circumferential scale lines with the outer edge of the exhaust pipe opening, the axis of the frustum structure can be ensured to coincide with the central axis of the exhaust pipe opening, thereby accurately fixing the measurement reference.

[0028] A digital angle sensor is installed at the hinge point between the horizontal ruler and the aperture rod. This sensor is used to measure the angle between the horizontal ruler and the aperture rod in real time. Preferably, the hinge structure includes a pin, and the digital angle sensor is sleeved on the outer circumference of the pin, enabling it to synchronously and accurately acquire angle change signals as the aperture rod rotates relative to the horizontal ruler.

[0029] The measuring instrument also includes a display unit, which is electrically connected to the digital angle sensor and is used to display the included angle data measured by the digital angle sensor in real time.

[0030] As a further improvement of this utility model, the measuring instrument may also include a Bluetooth data transmission module (such as a BLE 5.0 module) for wirelessly transmitting measurement data to external terminal devices such as mobile phones, tablets, or computers, facilitating real-time recording, archiving, and analysis of the data. In addition, the measuring instrument may also have a built-in data storage module (such as a Flash memory) for storing multiple sets of timestamped measurement data.

[0031] The beneficial effects of this utility model are as follows: High-precision measurement: The use of a high-precision digital angle sensor (accuracy up to ±0.1°) significantly reduces the error caused by traditional manual visual reading (usually ±1° to ±5°), ensuring that the measurement results meet the accurate testing requirements of national standards.

[0032] Adaptive positioning: Through the design of the conical frustum structure and circumferential scale lines, it can quickly and accurately adapt to exhaust pipe openings of different sizes and precisely position their central axis, effectively solving the alignment deviation problem caused by the inability of traditional rigid tools to adapt to diverse pipe opening structures.

[0033] Intelligent display and judgment: It integrates a digital measurement system and an intelligent display unit to realize automatic angle calculation and real-time display. It can also integrate standard threshold comparison and compliance prompt functions (such as three-color backlight). No manual calculation and interpretation are required, which reduces human error and improves the authority and efficiency of law enforcement and inspection.

[0034] Easy and efficient to operate: The simple structure and intuitive operation process, coupled with short measurement times, greatly improve work efficiency in batch vehicle inspection scenarios. Furthermore, optional data transmission and storage functions facilitate the electronic archiving and management of inspection records.

[0035] The accompanying illustration shows a scenario where the angle between the airflow direction and the horizontal plane is measured.

[0036] In the diagram: 10, level rod; 11, level instrument; 20, aperture rod; 30, hinge structure (pin); 40, display unit.

[0037] The specific embodiments described below, in conjunction with the accompanying drawings, further illustrate the present invention. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0038] like Figure 1 As shown, the present invention provides a motor vehicle engine exhaust pipe outlet airflow angle measuring instrument, which mainly includes a horizontal ruler rod 10, a bore rod 20, a hinge structure 30, a digital angle sensor (not shown separately in the figure, but located inside the hinge structure 30) and a display unit 40.

[0039] Both the level rod 10 and the aperture rod 20 are made of lightweight, high-strength aluminum alloy, with an overall weight controlled to within 500 grams for easy handheld operation. The level rod 10 is 240 mm long, and the aperture rod 20 is 200 mm long, with a length ratio of 1.2:1. The level rod 10 contains a high-precision electronic level 11, and its surface is also engraved with axial level bubble markings, all working together to establish a reliable horizontal reference surface.

[0040] The end of the bore rod 20 is designed as a frustum-shaped contact end. This frustum structure is made of high-temperature resistant ceramic material and can withstand temperatures above 600°C. The tapered design of the frustum structure allows it to accommodate inner diameters within... 40mm to Common flat-mouth exhaust pipe openings within a 130mm range. The outer surface of the frustum is engraved with clear circumferential graduations. The edges of the contact points of the frustum structure are rounded with a radius of 2mm (R=2mm) to prevent scratching the exhaust pipe opening.

[0041] The level rod 10 and the aperture rod 20 are hinged together by a high-precision pin 30. The sensor has a measurement accuracy of ±0.1°, a measurement range covering 0° to 120°, and a sampling frequency of 10Hz. When the aperture rod 20 rotates relative to the level rod 10, the sensor can synchronously and accurately detect the change in the included angle between the two.

[0042] The display unit 40 can use a 2.4-inch OLED display screen, installed near the hinge for easy observation. The display unit 40 integrates a signal processing module and a storage module. The signal processing module can use an STM32F4 series processor. The signal processing module is responsible for receiving signals from the digital angle sensor, filtering (e.g., using a Kalman filter algorithm), and calculating to obtain a stable and accurate angle value. The OLED display screen 40 can display the currently measured angle value and the horizontal reference status in real time, and simultaneously display the 15° and 45° threshold lines specified in the GB7258-2017 standard, using green, yellow, and red backlighting to visually indicate whether the measurement results are "compliant," "critical," or "exceeding the standard." The storage module can store up to 1000 sets of timestamped measurement records.

[0043] In addition, the measuring instrument is equipped with a Bluetooth 5.0 (BLE) data transmission module, which can send the measurement data to the mobile terminal (such as a mobile phone) of law enforcement officers in real time, so as to facilitate the generation of electronic test reports and archiving.

[0044] The digital angle sensor is connected to the aperture rod 20 via a rotating shaft pin 30 and is used to detect the angle θ between the level rod 10 and the aperture rod 20. Its output is an analog voltage signal, which is converted into a digital signal by an ADC module and then input to the processor. The level is used to correct the overall posture of the equipment and ensure the accuracy of the measurement reference. Data format and preprocessing steps: The data format is that all sensor output data is stored as 16-bit signed integers, represented as angle values.

[0045] The core algorithm of this application embodiment includes angle calculation, data fusion, and compliance judgment. Let the angle between the horizontal ruler rod 10 and the aperture rod 20 be θ. According to the GB7258-2017 standard, the threshold judgment logic is set as follows: if the measured angle θ with the longitudinal center plane of the vehicle is ≤15° and the angle θ with the horizontal plane is ≤45°, it is judged as "compliant" (green light prompt); if the angle with the longitudinal center plane of the vehicle is 15°<θ≤20° and the angle with the horizontal plane is 45°<θ≤50°, it is judged as "critical" (yellow light prompt); if the angle with the longitudinal center plane of the vehicle is θ>20° and the angle with the horizontal plane is θ>50°, it is judged as "exceeding the standard" (red light prompt).

[0046] In this embodiment of the measuring instrument, after startup, the STM32F4 processor automatically initializes each sensor module, completes self-test and calibration, and ensures the device is in normal working condition. The level rod 10 is placed in a horizontal position, and double leveling is performed using the built-in level 11 and the axial level bubble markings on the level rod surface to ensure the accuracy of the horizontal reference plane. The frustum structure of the aperture rod 20 is inserted into the exhaust pipe opening. Based on the size of the exhaust pipe opening, the self-adaptive characteristics of the frustum are used to make it fit the inner wall of the opening. By observing the circumferential scale lines on the frustum, it is ensured that the axis of the frustum coincides with the central axis of the exhaust pipe opening. After stable fitting, the digital angle sensor begins to collect the angle θ between the level rod 10 and the aperture rod 20. The STM32F4 processor uses a Kalman filter algorithm to fuse the data and obtain an accurate angle value. The OLED display screen 40 displays the current angle θ, the horizontal reference status, and the comparison with the GB7258-2017 standard threshold in real time, and provides prompts through three-color backlighting to intuitively reflect whether the measurement results are compliant. After each measurement, the system automatically records the current timestamp and measurement result, and stores them in the Flash memory. Simultaneously, the data can be synchronized to a mobile terminal via Bluetooth data transmission module, facilitating the archiving and export of measurement records. After the measurement is completed, the aperture rod 20 is removed from the exhaust pipe, and the device power is turned off. This embodiment of the application can add an angle locking mechanism to the device to fix the relative position between the horizontal ruler rod 10 and the aperture rod 20 during the measurement process, further ensuring the stability and repeatability of the measurement.

[0047] This utility model combines innovative mechanical structure design with high-precision electronic measurement technology to achieve rapid, accurate, and reliable measurement of the airflow angle at the exhaust pipe of a motor vehicle, effectively meeting the high-standard requirements of vehicle inspection, environmental law enforcement, and other scenarios.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A motor vehicle engine exhaust pipe outlet airflow angle measuring instrument, characterized in that, The angle measuring instrument includes a horizontal ruler, an aperture rod, a digital angle sensor, and a display unit; one end of the horizontal ruler and the aperture rod are connected by a hinge structure, and the free end of the aperture rod is a frustum structure; a digital angle sensor for measuring the angle between the horizontal ruler and the aperture rod is provided at the hinge structure. A level is installed on the horizontal ruler rod; the truncated cone structure can adaptively insert into and fit against the inner wall of the engine exhaust pipe. The display unit is electrically connected to the digital angle sensor, receives the included angle data measured by the digital angle sensor, and displays it.

2. The airflow angle measuring instrument for the exhaust pipe of a motor vehicle engine according to claim 1, characterized in that, The taper of the frustum structure is adapted to the inner diameter range of the exhaust pipe opening of the motor vehicle; the diameter range of the cross-sections at the upper and lower ends of the frustum structure is φ40mm to φ130mm.

3. The airflow angle measuring instrument for the exhaust pipe of a motor vehicle engine according to claim 1, characterized in that, The frustum structure is made of a high-temperature resistant material, which can withstand temperatures greater than 600°C.

4. The airflow angle measuring instrument for the exhaust pipe of a motor vehicle engine according to claim 1, characterized in that, The frustum structure has chamfered edges at both ends.

5. The airflow angle measuring instrument for the exhaust pipe of a motor vehicle engine according to claim 1, characterized in that, The length of the horizontal ruler rod is greater than the length of the aperture rod, and the horizontal ruler rod has a horizontal reference line on its body.

6. The airflow angle measuring instrument for the exhaust pipe of a motor vehicle engine according to claim 5, characterized in that, The length ratio of the horizontal ruler to the aperture rod is 1.2:

1.

7. The airflow angle measuring instrument for the exhaust pipe of a motor vehicle engine according to claim 1, characterized in that, The hinge structure includes a pin; The digital angle sensor is sleeved on the outer periphery of the pin and can synchronously collect angle signals as the aperture rod rotates relative to the horizontal ruler rod.

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