A high-pressure oil pump gear pulse sensor

Abstract

The application provides a high-pressure oil pump gear pulse sensor which is convenient to install, plug-and-play, high in phase detection precision and strong in anti-interference. The high-pressure oil pump gear pulse sensor comprises a sensor body, an adjusting gasket and an O-shaped ring. The sensor body comprises a sensing component mounting part, a body fastening mounting part and a mounting connecting plate. The body fastening mounting part is arranged beside the sensing component mounting part. The mounting connecting plate connects the sensing component mounting part and the body fastening mounting part into an integrated whole. The body fastening mounting part is provided with a mounting positioning hole. The sensing component mounting part comprises a lower convex sensing part and an upper convex wiring part. A wiring PIN needle group is arranged in the inner cavity of the wiring part.

Description

Technical Field

[0001] This invention relates to the technical field of pulse sensors, specifically a high-pressure oil pump gear pulse sensor. Background Technology

[0002] The gear pulse sensor is a key detection component of the high-pressure oil pump. It monitors the speed and phase by collecting pulse signals from the grooves on the camshaft gear disk as they rotate, accurately identifying the matching between the engine cylinder and the high-pressure oil pump cylinder. This ensures the synchronization of the operation of the engine cylinder and the high-pressure oil pump cylinder, ensuring the timing of fuel injection, providing accurate data support for fuel injection control, and ensuring the normal operation of the engine.

[0003] Existing gear pulse sensors suffer from the following key technical defects: Poor installation compatibility: Existing sensors are directly fixed by screwing on the sensor body with threads, making it difficult to control the gap between the sensor and the pulse disk. Adjusting the gap requires repeated disassembly and reassembly of the sensor body, which can easily cause sensor installation damage and result in high adaptation costs. The sensor is susceptible to gear tooth profile errors and installation clearance fluctuations, resulting in high pulse signal distortion, speed measurement error ≥ ±1%, and low phase recognition accuracy, which cannot meet the precise control requirements of high-pressure oil pumps. The high-pressure oil pump operates in an environment with strong electromagnetic interference, fuel splashing, and vibration impact. Existing sensors lack shielding and sealing designs, making the signal susceptible to interference and causing detection failure. Furthermore, oil intrusion can easily damage the internal circuitry.

[0004] Therefore, there is a lack of a high-pressure oil pump gear pulse sensor among the existing pulse sensors that is easy to install, plug and play, has high phase detection accuracy, and strong anti-interference capabilities. Summary of the Invention

[0005] To address the above problems, this invention provides a high-pressure oil pump gear pulse sensor, which is easy to install, plug and play, has high phase detection accuracy, and strong anti-interference capabilities.

[0006] A high-pressure oil pump gear pulse sensor, characterized in that it comprises: The sensor body includes a sensing component mounting part, a body fastening mounting part, and a mounting connecting plate. The body fastening mounting part is located next to the sensing component mounting part. The mounting connecting plate connects the sensor component mounting part and the body fastening mounting part into one unit. The body fastening mounting part is provided with a mounting positioning hole. The sensor component mounting part includes a lower protruding sensing part and an upper protruding wiring part. The wiring part has a wiring PIN pin group inside its cavity. Adjusting shims; And O-rings; The convex sensing part includes a sensing end face for detection and a convex column. A positioning ring groove is provided below the lower surface of the mounting connecting plate. The O-ring is fitted into the positioning ring groove. The outer ring surface of the O-ring is interference-fitted with the mounting hole of the sensing part. The upper surface of the adjusting shim is in close contact with the lower surface of the mounting connecting plate. The lower surface of the adjusting shim is in close contact with the corresponding surface of the mounting carrier. The fixing bolt passes through the mounting positioning hole and is threaded into the positioning mounting screw hole of the mounting carrier. An installation gap is left on the sensing end face facing the top surface of the gear teeth.

[0007] Its further features are: The protruding sensing part is enclosed with a sensing magnetic block and a sensor IC chip. The sensor IC chip is independently connected to the inner end of each wiring PIN pin of the wiring PIN pin group, and the outer end of each wiring PIN pin of the wiring PIN pin group is used for external connectors. The wiring PIN group includes an OUT wiring PIN, a GND wiring PIN, and a Vcc wiring PIN. After the wiring PIN group, sensing magnetic block and sensor IC chip are connected and positioned, the sensor body is formed by injection molding. The entire structure is seamless and has no welding structure. The protruding wiring portion forms a concave cavity that conforms to the shape of the external connector, which facilitates reliable and quick insertion of the external connector. The pulse disk it is compatible with has grooves evenly spaced within 360°, and a tooth-missing recognition gear is designed within N° before the first groove. By collecting the magnetic field change signal between the gear tooth tip and tooth valley, the speed, direction and phase are synchronously detected through phase difference calculation.

[0008] With this invention, the sensing component mounting part, where the sensing end face of the gear pulse sensor faces the top surface of the gear teeth, and the main body fastening mounting part, which is used to fix the entire gear pulse sensor to the mounting carrier, are set independently. The sealing structure of the sensing component mounting part and the mounting carrier adopts a "radial sealing + end face sealing" design: an O-ring with an interference fit is provided at the sensor and sensing part mounting hole (pump body mounting hole) to achieve radial sealing, and an adjusting shim is provided at the sensor and sensing part mounting hole (pump body mounting hole) to achieve end face sealing. The input and output ends adopt quick-sealing external connectors, which can withstand a temperature range of -30℃ to 135℃ and a high pressure of 100MPa, preventing oil intrusion and signal interference. It is easy to install, plug and play, has high phase detection accuracy, and strong anti-interference. Attached Figure Description

[0009] Figure 1 This is a three-dimensional perspective view of the present invention; Figure 2This is a perspective view of the present invention assembled on the mounting carrier; Figure 3 for Figure 2 A schematic diagram of the partial structure of section AA; Figure 4 for Figure 3 A view of direction B and the corresponding electrical connection diagram; Figure 5 Output waveform diagram of a specific embodiment of the present invention; The names corresponding to the serial numbers in the diagram are as follows: Sensor body 10, adjusting shim 20, O-ring 30, sensing component mounting part 40, convex sensing part 41, sensing end face 411, convex column 412, positioning ring groove 413, upper positioning ring 414, lower positioning ring 415, wiring part 42, body fastening mounting part 50, mounting positioning hole 51, mounting connecting plate 60, wiring PIN pin group 70, OUT wiring PIN pin 71, GND wiring PIN pin 72, Vcc wiring PIN pin 73, sensing magnetic block 80, sensor IC chip 90, mounting carrier 100, sensing part mounting hole 1, positioning mounting screw hole 2; Installation gap L. Detailed Implementation

[0010] A high-pressure oil pump gear pulse sensor, see Figures 1-5 It includes a sensor body 10, an adjustment shim 20, and an O-ring 30; The sensor body 10 includes a sensing component mounting part 40, a body fastening mounting part 50, and a mounting connecting plate 60. The body fastening mounting part 50 is located next to the sensing component mounting part 40. The mounting connecting plate 60 connects the sensor component mounting part 40 and the body fastening mounting part 50 into one unit. The body fastening mounting part 50 is provided with a mounting positioning hole 51. The sensor component mounting part 40 includes a lower protruding sensing part 41 and an upper protruding wiring part 42. A wiring PIN pin group 70 is provided in the inner cavity of the wiring part 42. The convex sensing part 41 includes a sensing end face 411 for detection and a convex column 412. The convex column 412 has a positioning ring groove 413 below the lower surface of the mounting connecting plate. An O-ring 30 is fitted into the positioning ring groove 413. The outer ring surface of the O-ring 30 is installed with an interference fit relative to the sensing part mounting hole 1. The upper surface of the adjusting shim 20 is in close contact with the lower surface of the mounting connecting plate 60. The lower surface of the adjusting shim 20 is in close contact with the corresponding surface of the mounting carrier 100. The fixing bolt 110 passes through the mounting positioning hole 51 and is threaded to the positioning mounting screw hole 2 of the mounting carrier 100. The sensing end face 411 has an installation gap L facing the top surface of the gear teeth.

[0011] In a specific embodiment, the height of the positioning ring groove 413 is fixed and reliably set by the upper positioning ring 414 and the lower positioning ring 415. The O-ring 30 is specifically a fluororubber O-ring, and its interference with the mounting hole 1 of the sensing part is 0.3mm. The adjusting shim 30 is a copper shim, and the thickness of the adjusting shim 30 ensures that the mounting gap L left by the sensing end face 411 toward the gear tooth top surface is 0.5~0.7mm.

[0012] In a specific embodiment, the convex sensing portion 41 is enclosed by a sensing magnetic block 80 and a sensor IC chip 90. The sensor IC chip 90 is independently connected to the inner end of each wiring PIN pin of the wiring PIN pin group 70, and the outer end of each wiring PIN pin of the wiring PIN pin group 70 is used for an external connector. The wiring PIN group 70 includes OUT wiring PIN 71, GND wiring PIN 72, and Vcc wiring PIN 73; After the wiring PIN group 70, sensing magnetic block 80 and sensor IC chip 90 are connected and positioned, the sensor body 10 is formed by injection molding. The entire structure is seamless and has no welding structure. The convex wiring portion 42 forms a concave cavity that mimics the shape of the external connector, which facilitates reliable and quick insertion of the external connector.

[0013] In a specific embodiment, the pulse disk to which it is adapted is designed with grooves at 60° intervals within 360°, and a tooth-missing recognition gear is designed 15° before the first groove. By collecting the magnetic field change signal between the gear tooth tip and tooth valley, the rotation speed, direction and phase synchronization detection are realized through phase difference calculation.

[0014] With this invention, the sensing component mounting part, where the sensing end face of the gear pulse sensor faces the top surface of the gear teeth, and the main body fastening mounting part, which is used to fix the entire gear pulse sensor to the mounting carrier, are set independently. The sealing structure of the sensing component mounting part and the mounting carrier adopts a "radial sealing + end face sealing" design: an O-ring with an interference fit is provided at the sensor and sensing part mounting hole (pump body mounting hole) to achieve radial sealing, and an adjusting shim is provided at the sensor and sensing part mounting hole (pump body mounting hole) to achieve end face sealing. The input and output ends adopt quick-sealing external connectors, which can withstand a temperature range of -30℃ to 135℃ and a high pressure of 100MPa, preventing oil intrusion and signal interference. It is easy to install, plug and play, has high phase detection accuracy, and strong anti-interference.

[0015] The sensor body is encapsulated in engineering plastic and uses an O-ring design to achieve a sealing effect. During installation, the sensor installation depth is measured to ensure that the gap between the sensor sensing surface and the gear tooth tip is 0.5~0.7mm. A suitable adjusting shim is selected and inserted directly into the mounting hole of the sensing part along with the sensor. It is then fixed by tightening the fixing bolts on the side with a tightening torque of 6N·m, making disassembly and assembly convenient. Due to the O-ring design on the sensor body, it can effectively seal the leakage of engine oil in the pump body cam cavity. The sensor terminal is designed as a conventional 3-terminal connector, with an input power terminal, a signal detection output terminal, and a ground terminal. With an input voltage of 5V, it can work stably under harsh temperature conditions (-30°~135°). It reads the pulse disk groove on the camshaft and converts it into a digital signal output to match the engine operation. The pulse disk is designed with grooves every 60° on average within 360°, and a tooth-missing recognition gear is designed 15° before the first groove. It collects the magnetic field change signal between the gear tooth tip and the tooth valley, and realizes the synchronous detection of speed, direction and phase through phase difference calculation.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: Installation efficiency is greatly improved. No special equipment is required. Simply insert the appropriate adjusting shim and tighten it manually with a regular wrench. Assembly can be completed in about 25 seconds. It can be used on high-pressure oil pumps of various specifications. The toothed positioning design ensures that the speed measurement error is ≤±0.1%, the phase recognition accuracy is ±0.5°, and the steering recognition response time is ≤5ms. It can accurately capture speed fluctuations and meet the closed-loop control requirements of high-pressure oil pumps. Adopting a "radial seal + end face seal" design, it can still work stably under conditions of oil splashing and engine vibration, with a signal distortion rate of ≤0.05%, and a service life twice that of traditional sensors; The sensor terminal design adopts a 3-terminal quick-connect package connector, which has strong anti-interference, convenient plug-in installation, and stable signal, meeting the working requirements of the engine under various harsh conditions.

[0017] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0018] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-pressure oil pump gear pulse sensor, characterized in that, It includes: The sensor body includes a sensing component mounting part, a body fastening mounting part, and a mounting connecting plate. The body fastening mounting part is located next to the sensing component mounting part. The mounting connecting plate connects the sensor component mounting part and the body fastening mounting part into one unit. The body fastening mounting part is provided with a mounting positioning hole. The sensor component mounting part includes a lower protruding sensing part and an upper protruding wiring part. The wiring part has a wiring PIN pin group inside its cavity. Adjusting shims; And O-rings; The convex sensing part includes a sensing end face for detection and a convex column. A positioning ring groove is provided below the lower surface of the mounting connecting plate. The O-ring is fitted into the positioning ring groove. The outer ring surface of the O-ring is interference-fitted with the mounting hole of the sensing part. The upper surface of the adjusting shim is in close contact with the lower surface of the mounting connecting plate. The lower surface of the adjusting shim is in close contact with the corresponding surface of the mounting carrier. The fixing bolt passes through the mounting positioning hole and is threaded into the positioning mounting screw hole of the mounting carrier. An installation gap is left on the sensing end face facing the top surface of the gear teeth.

2. The high-pressure oil pump gear pulse sensor according to claim 1, characterized in that: The protruding sensing part contains a sensing magnetic block and a sensor IC chip. The sensor IC chip is independently connected to the inner end of each wiring PIN pin of the wiring PIN pin group, and the outer end of each wiring PIN pin of the wiring PIN pin group is used for external connectors.

3. A high-pressure oil pump gear pulse sensor according to claim 2, characterized in that: The wiring PIN group includes an OUT wiring PIN, a GND wiring PIN, and a Vcc wiring PIN.

4. A high-pressure oil pump gear pulse sensor according to claim 2, characterized in that: After the wiring PIN group, sensing magnetic block and sensor IC chip are connected and positioned, the sensor body is formed by injection molding. The entire structure is seamless and has no welding structure.

5. A high-pressure oil pump gear pulse sensor according to claim 2, characterized in that: The convex wiring portion forms a concave cavity that mimics the shape of an external connector.

6. A high-pressure oil pump gear pulse sensor according to claim 1, characterized in that: The pulse disk it is compatible with has grooves evenly spaced within 360°, and a tooth-missing recognition gear is designed within N° before the first groove. By collecting the magnetic field change signal between the gear tooth tip and tooth valley, the speed, direction and phase are synchronously detected through phase difference calculation.

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