High-pressure rail pressure sensor stability testing device
By designing a high-pressure rail pressure sensor stability testing device, using zero-point output detection head and temperature cycle, the problem of difficult testing of core stability of the rail pressure sensor in the existing technology is solved, and the stability of core output performance is achieved Test to meet group usage requirements.
Patent Information
- Application Number
- CN202420021212.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-04
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-01-04
AI Technical Summary
The prior art is difficult to effectively test and ensure the stability of the rail pressure sensor core, resulting in severe changes in output performance during use and unable to meet the group usage requirements.
A high-pressure rail pressure sensor stability testing device is designed, including a test bench, a temperature control room, a temperature circulating box and a core body. Through zero-point output detection head, temperature cycle and data recording, the stability of the core body is tested. sex.
Effective testing of the stability of the rail pressure sensor core body is realized, ensuring that its output performance changes are within an acceptable range and meet the group usage requirements.
Smart Images
Figure CN222528833U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sensor testing, in particular to a high-pressure rail pressure sensor stability testing device. Background Art
[0002] The rail pressure sensor is a type of pressure sensor, which is mainly used to measure the actual pressure in the common rail pipe of the high-pressure common rail system. The common rail pressure sensor converts the pressure value into a voltage signal and sends it to the electronic control unit (ECU) to achieve closed-loop control of the fuel pressure. The pressure core is the core component of the rail pressure sensor. The chip inside the pressure-sensitive core is its only electronic component. During the chip manufacturing process and the core packaging process, a series of defects such as stress and charge concentration will be generated, as well as surface contamination, poor lead welding, silicon chip cracks and other problems. The failure rate is highest at the beginning of chip use. After this period of time, the chip will enter a very long stable period, which may be several years or even decades. Then the electronic components will enter the aging period, and the failure rate will continue to increase over time, which will have a great impact on the pressure. For the force core, linearity, repeatability, hysteresis and accuracy are its static performance, which is largely determined by the performance of the chip. The zero-point output, full-scale output, thermal hysteresis, thermal zero-point drift, thermal sensitivity drift and time drift of the pressure sensitive core will also change with time. This is caused by the packaging of the oil-filled pressure core and is unavoidable. These time-varying performances of the core will directly determine its usage status in the equipment. If the output of the core changes drastically over time, it cannot meet the group's use requirements. Therefore, during use, the output change of the core will be pursued to be small enough, that is, the performance of the core will be pursued to be more stable. Therefore, it is very necessary to develop a testing process that can make the output performance of the core more stable. Utility Model Content
[0003] The purpose of the present utility model is to provide a high-pressure rail pressure sensor stability testing device to solve the problems raised in the above background technology.
[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-pressure rail pressure sensor stability test device, comprising a test bench, a temperature control chamber, a temperature cycle box and a core body, a turntable is provided on the top of the test bench, and placement slots are evenly distributed on the top of the turntable, and the core bodies are placed inside the placement slots, a cylinder is provided on one side of the test bench through a frame, and a zero-point output detection head is provided at the output end of the cylinder through a telescopic column, a temperature cycle box is provided on one side of the test bench, and a temperature control chamber is provided at the central position inside the temperature cycle box , through holes are evenly distributed on both sides of the temperature control chamber, a base is provided at the bottom end of the temperature control chamber, and a movable plate is provided on the top of the base, and a test stand is provided on the top of the movable plate; a first servo motor is fixed to the top of the test bench, and the output end of the first servo motor is connected to the turntable through a roller; a heating chamber is provided on the outside of the temperature control chamber, and a heating resistor is provided at the top of the heating chamber; heat-conducting rings are evenly distributed at the central position of the temperature control chamber, and the heat-conducting rings are evenly connected to the heating resistor through heat-conducting rods.
[0005] As a further improvement of the present invention, a blade is provided at the bottom end of the heating chamber, a second servo motor is provided inside the temperature circulation box, and an output end of the second servo motor is connected to the blade via a roller.
[0006] As a further improvement of the present invention, a screw rod is provided at the central position inside the base, and a drive block is sleeved on the screw rod, the top of the drive block is connected to the movable plate, a third servo motor is fixed on the base, and the output end of the third servo motor is connected to the screw rod.
[0007] As a further improvement of the present invention, guide rods are provided on both sides of the interior of the base, and both sides of the bottom of the movable plate are slidably connected to the guide rods through guide sleeves.
[0008] As a further improvement of the present invention, 10 groups of placement slots are provided, and the placement slots are distributed in a concentric circle structure around the turntable.
[0009] According to the above description of the technical solution, compared with the existing technology, the technical characteristics and beneficial technical effects of the technical solution include the following: the technical solution is equipped with a test bench, a placement slot, a core body, a zero-point output detection head, a temperature cycle box, a heating chamber, a temperature control room and a test bench. 10 core bodies for the rail pressure sensor are selected and first placed on the turntable on the top of the test bench. The zero-point output is tested by the zero-point output detection head, and the data is recorded by the control system. The zero-point output of the rail pressure sensor is calibrated and verified in advance to prevent inaccurate or distorted test results. There are 10 groups of placement slots on the top of the turntable, which can place 10 core bodies at a time.
[0010] In this technical solution, the first servo motor drives the turntable to rotate and rotate the core body to the bottom of the zero-point output detection head in turn, thereby improving the pre-test efficiency. The core body is then inserted into the electrical aging device and placed on the test rack in the temperature cycle box for temperature cycling. The number of temperature cycles is set to 5 times, 10 times, 15 times, and 20 times respectively. After 5, 10, 15, and 20 times of temperature cycling, all the core bodies are taken out after keeping warm for 1 hour, and their zero-point output is tested again on the test bench and recorded, and compared with the zero-point data of the previous test, thereby realizing the stability test of the core body in the rail pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the front cross-sectional structure of the present utility model.
[0012] Figure 2 This is a schematic diagram of the base structure from a top view of the present invention.
[0013] Figure 3 This is a schematic diagram of the test bench structure of the present utility model.
[0014] Figure 4 This is a schematic diagram of the turntable structure from a top view of the present invention.
[0015] Figure 5 For the utility model Figure 1 Enlarged structural diagram at point A in the middle.
[0016] In the figure: 1. Test bench; 2. First servo motor; 3. Turntable; 4. Frame; 5. Cylinder; 6. Zero-point output detection head; 7. Test frame; 8. Heating resistor; 9. Temperature control chamber; 10. Heating chamber; 11. Temperature circulation box; 12. Through hole; 13. Second servo motor; 14. Blade; 15. Movable plate; 16. Base; 17. Screw; 18. Drive block; 19. Guide rod; 20. Third servo motor; 21. Placement slot; 22. Core body; 23. Thermal ring; 24. Thermal rod. DETAILED DESCRIPTION
[0017] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0018] See also Figure 1-5The utility model provides an embodiment: a high-pressure rail pressure sensor stability test device, including a test bench 1, a temperature control chamber 9, a temperature cycle box 11 and a core body 22. A turntable 3 is provided on the top of the test bench 1, and placement slots 21 are evenly distributed on the top of the turntable 3. The core bodies 22 are placed inside the placement slots 21; there are 10 groups of placement slots 21, and the placement slots 21 are distributed in a concentric circle structure around the turntable 3; 10 core bodies 22 for the rail pressure sensor are selected and first placed in the placement slots 21 of the turntable 3 on the top of the test bench 1, and 10 core bodies 22 can be placed at one time; a cylinder 5 is provided on one side of the test bench 1 through a frame 4, and a zero-point output detection head 6 is provided at the output end of the cylinder 5 through a telescopic column; a first servo motor 2 is fixed at the top of the test bench 1, and the output end of the first servo motor 2 is connected to the turntable 3 through a roller.
[0019] The first servo motor 2 drives the turntable 3 to rotate and rotate the core body 22 to the bottom of the zero-point output detection head 6 in turn. The zero-point output of the rail pressure sensor is tested by the zero-point output detection head 6, and the data is recorded by the control system. The zero-point output of the rail pressure sensor is calibrated and verified in advance to prevent inaccurate or distorted test results.
[0020] A temperature cycle box 11 is provided on one side of the test bench 1, and a temperature control chamber 9 is provided at the central position inside the temperature cycle box 11, and through holes 12 are evenly distributed on both sides of the temperature control chamber 9; a base 16 is provided at the bottom end of the temperature control chamber 9, and a movable plate 15 is provided on the top of the base 16, and a test stand 7 is provided on the top of the movable plate 15. After zero-point side viewing, the core body 22 is inserted into the electrical aging device and placed on the test stand 7 in the temperature cycle box 11 for temperature cycling.
[0021] A heating chamber 10 is provided on the outside of the temperature control chamber 9, and a heating resistor 8 is provided at the top of the heating chamber 10. Heat-conducting rings 23 are evenly distributed at the central position inside the temperature control chamber 9, and the heat-conducting rings 23 are evenly connected to the heating resistor 8 through heat-conducting rods 24; a blade 14 is provided at the bottom end of the heating chamber 10, and a second servo motor 13 is provided inside the temperature circulation box 11, and the output end of the second servo motor 13 is connected to the blade 14 through a roller.
[0022] A heating resistor 8 is provided in the heating chamber 10, which can generate heat when powered on. The heat is evenly transferred to the heat-conducting ring 23 through the heat-conducting rod 24. Since the heat-conducting ring 23 is evenly distributed on the inner wall of the heating chamber 10, the temperature in the heating chamber 10 can be quickly increased under the premise of energy saving. The second servo motor 13 drives the blade 14 to rotate, and the hot air is blown into the temperature control chamber 9 through the through hole 12; the number of temperature cycles is set to 5 times, 10 times, 15 times, and 20 times respectively through the control system. After the temperature cycle is 5 times, 10 times, 15 times, and 20 times respectively, all the core bodies 22 are removed after keeping warm for 1 hour.
[0023] A screw rod 17 is provided at a central position inside the base 16, and a driving block 18 is provided on the screw rod 17. The top of the driving block 18 is connected to the movable plate 15. A third servo motor 20 is fixed on the base 16, and the output end of the third servo motor 20 is connected to the screw rod 17. The screw rod 17 is driven to rotate by the third servo motor 20, so that the driving block 18 moves along the screw rod 17, and the movable plate 15 and the test frame 7 on the top are moved out of the temperature control chamber 9, which makes it convenient to take out the core body 22 without putting hands into the temperature control chamber 9 to prevent burns to the staff.
[0024] Guide rods 19 are provided on both sides of the base 16, and both sides of the bottom of the movable plate 15 are slidably connected to the guide rods 19 through guide sleeves to guide and limit the movable plate 15; the removed core body 22 is tested again on the test bench 1 for its zero point output and recorded, and compared with the zero point data of the previous test, thereby realizing the stability test of the core body 22 in the rail pressure sensor.
[0025] After the core body 22 has undergone a long-term stability test, the criterion for judging the performance stability is that the zero-point output change of the core body 22 before and after the temperature cycle in this stage is ≤0.2mV. For example: the zero-point output change of the core body 22 after 10 temperature cycles and 5 temperature cycles is ≤0.2mV, then it can be preliminarily judged that the performance of the core body 22 of this range tends to be stable; the specific models and specifications of the first servo motor 2, the second servo motor 13, the third servo motor 20, the cylinder 5, the zero-point output detection head 6 and the heating resistor 8 need to be determined by the selection calculation based on the specification parameters of the device. The selection calculation method is an existing technology, so it will not be described in detail.
[0026] When the device is used, ten rail pressure sensor core bodies 22 are selected and placed in the slot 21 of the turntable 3 at the top of the test bench 1. The first servo motor 2 drives the turntable 3 to rotate the core bodies 22 to the position below the zero output detection head 6. The zero output of the zero output detection head 6 is tested and the data is recorded by the control system. The zero output of the rail pressure sensor is pre-calibrated and verified to prevent inaccurate or distorted test results. Afterwards, the core bodies 22 are placed on the test rack 7 in the temperature cycle chamber 11 of the electrical aging device and temperature cycled. A heating resistor 8 is provided in the heating chamber 10. When energized, it generates heat. The heat is evenly transferred to the heat-conducting ring 23 through the heat-conducting rod 24. Since the heat-conducting ring 23 is evenly distributed on the inner wall of the heating chamber 10, the temperature in the heating chamber 10 can be quickly increased while saving energy. The second servo motor 13 drives the blade 14 to rotate, blowing hot air through the through hole 12 into the temperature control chamber 9. The number of temperature cycles is set to 5 times, 10 times, 15 times and 20 times respectively. After the temperature cycles are 5 times, 10 times, 15 times and 20 times respectively, all the core bodies 22 are taken out after keeping warm for 1 hour. When taking them out, the third servo motor 20 can be used to drive the screw rod 17 to rotate, so that the driving block 18 moves along the screw rod 17, and the movable plate 15 and the top test frame 7 are moved out of the temperature control chamber 9, so that the core body 22 can be easily taken out without putting hands into the temperature control chamber 9 to prevent burns to the staff. The removed core body 22 is tested again on the test bench 1 for its zero point output and recorded, and compared with the zero point data of the previous test, so as to realize the stability test of the core body 22 in the rail pressure sensor. After the core body 22 has undergone a long-term stability test, the criterion for judging the performance stability is that the zero point output change of the core body 22 before and after the temperature cycle in this stage is ≤0.2mV. For example: the zero point output change of the core body 22 after 10 temperature cycles and 5 temperature cycles is ≤0.2mV, then it can be preliminarily judged that the performance of the core body 22 of this range tends to be stable.
Claims
1. A high pressure rail pressure sensor stability test device, characterized in that: The invention comprises a test bench (1), a temperature control chamber (9), a temperature circulation box (11) and a core body (22); a turntable (3) is arranged on the top of the test bench (1), and placement grooves (21) are evenly distributed on the top of the turntable (3); the core body (22) is placed inside each of the placement grooves (21); a cylinder (5) is arranged on one side of the test bench (1) through a frame (4), and a zero-point output detection head (6) is arranged at the output end of the cylinder (5) through a telescopic column; a temperature circulation box (11) is arranged on one side of the test bench (1), and a temperature control chamber (9) is arranged at a central position inside the temperature circulation box (11); through holes (12) are evenly distributed on both sides of the temperature control chamber (9); A base (16) is arranged at the bottom end of the temperature control chamber (9), and a movable plate (15) is arranged at the top of the base (16), and a test stand (7) is arranged at the top of the movable plate (15); a first servo motor (2) is fixed at the top end of the test bench (1), and the output end of the first servo motor (2) is connected to the turntable (3) via a roller; a heating chamber (10) is arranged on the outside of the temperature control chamber (9), and a heating resistor (8) is arranged at the top end of the heating chamber (10); heat-conducting rings (23) are evenly distributed at the central position of the temperature control chamber (9), and the heat-conducting rings (23) are evenly connected to the heating resistor (8) via heat-conducting rods (24).
2. A high pressure rail pressure sensor stability testing device according to claim 1, characterized in that: A blade (14) is arranged at the bottom end of the heating chamber (10), a second servo motor (13) is arranged inside the temperature circulation box (11), and an output end of the second servo motor (13) is connected to the blade (14) via a roller.
3. A high pressure rail pressure sensor stability testing device according to claim 1, characterized in that: A screw rod (17) is arranged at a central position inside the base (16), and a driving block (18) is sleeved on the screw rod (17), the top of the driving block (18) is connected to the movable plate (15), a third servo motor (20) is fixed to the base (16), and an output end of the third servo motor (20) is connected to the screw rod (17).
4. A high pressure rail pressure sensor stability testing device according to claim 1, characterized in that: Guide rods (19) are provided on both sides of the interior of the base (16), and both sides of the bottom of the movable plate (15) are slidably sleeved with the guide rods (19) via guide sleeves.
5. A high pressure rail pressure sensor stability testing device according to claim 1, characterized in that: The placement grooves (21) are provided in 10 groups, and the placement grooves (21) are distributed in a concentric circle structure around the rotating disk (3).