A high-pressure and high-temperature resistant automotive proximity inductive sensor and its manufacturing process

Abstract

The present invention discloses a high-pressure and high-temperature resistant automotive proximity inductive sensor and its manufacturing process, which relates to the field of laser sensors. In view of the fact that the existing inductive sensor has the problem that the injection glue will be broken into slag after working for a long time at high temperature, thereby affecting the stability of the internal oscillation coil of the inductive sensor, and the temperature change from high temperature to normal temperature may cause the coil and electronic components to be pulled by the glue to break and fall off, thereby affecting the product function, the following scheme is proposed, which includes an LC oscillation part, a signal processing part and an output part, the LC oscillation part includes an anti-interference module, an LC oscillation module and a high-temperature compensation network, and the LC oscillation module is connected to the anti-interference module, the high-temperature compensation network and the signal amplification and processing module. The present invention has a novel structure, can be used at an operating temperature of up to 120°C, has a strong transient anti-interference ability, a wide range of applications, has the ability to withstand 50Mpa oil pressure, and has high stability in use.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle proximity inductive sensors, and in particular to a vehicle proximity inductive sensor resistant to high pressure and high temperature and a manufacturing process thereof. Background Art

[0002] At present, in the industrial market, ordinary inductive sensors cannot be used for the detection of targets in hydraulic cylinders due to their cap-shell separation design. Ordinary all-metal inductive sensors cannot withstand oil pressures as high as 50Mpa and cannot pass the highest level of transient anti-interference tests. Common inductive sensors cannot simultaneously meet the requirements of high temperature and high pressure resistance and transient anti-interference tests. For the use scenarios of engineering machinery vehicles, such as lifting machinery, concrete machinery and other special vehicles that require hydraulic mechanical arms, the sensor pressure resistance reaches 50Mpa, the working temperature requirement is as high as 100℃~120℃, and there are extremely high requirements for transient anti-interference. It cannot be applied. In addition, the injection glue of common electrical sensors will be broken after working for a long time at high temperature, thereby affecting the stability of the oscillation coil inside the inductive sensor. In the temperature change from high temperature to normal temperature, the coil and electronic components may be pulled and broken by the glue and fall off, thereby affecting the product function. Therefore, in order to solve such problems, we propose a high-pressure and high-temperature resistant automotive proximity inductive sensor and its manufacturing process. Summary of the invention

[0003] The technical problem to be solved by this patent is to provide a high-pressure and high-temperature resistant automotive proximity inductive sensor, which solves the problem that the existing inductive sensor's injection glue will become slag after working for a long time at high temperature, thereby affecting the stability of the oscillation coil inside the inductive sensor, and the temperature change from high temperature to normal temperature may cause the coil and electronic components to be pulled and broken and fall off by the glue, thereby affecting the product function. It has a strong transient anti-interference ability and realizes the characteristics of technology that can be used in engineering vehicles to work stably under high temperature and high pressure conditions.

[0004] In order to solve the above technical problems, the technical solution of the present invention is:

[0005] A high-voltage and high-temperature resistant automotive proximity inductive sensor, comprising an LC oscillation part, a signal processing part and an output part, wherein the LC oscillation part comprises an anti-interference module, an LC oscillation module and a high-temperature compensation network, wherein the LC oscillation module is connected with the anti-interference module, the high-temperature compensation network and the signal amplification and processing module, wherein the LC oscillation module performs signal anti-interference through the anti-interference module, and the LC oscillation module performs temperature compensation for the electrical characteristics of the coil in the LC oscillation module in a high-temperature environment through the high-temperature compensation network, thereby achieving high-temperature stability, and the LC oscillation module transmits the signal to the signal amplification and processing module;

[0006] The signal processing part includes a signal amplification and processing module and a short-circuit protection module. The signal amplification and processing module is connected to the short-circuit protection module, the LC oscillation module and the signal judgment and output module. The signal amplification and processing module is used to receive the signal transmitted by the LC oscillation module, and amplify and process the signal. The short-circuit protection module performs short-circuit protection on the signal amplification and processing module to ensure the normal operation of the signal amplification and processing module. The signal amplified and processed by the signal amplification and processing module is transmitted to the signal judgment and output module.

[0007] The output part includes a signal judgment and output module, an output protection module, a transient anti-interference module and an anti-interference module. The signal judgment and output module is connected to the output protection module, the transient anti-interference module, the anti-interference module and the signal amplification and processing module. The signal judgment and output module receives the signal of the signal amplification and processing module, and judges and outputs the signal, and the anti-interference module performs anti-interference on the signal judgment and output module. At the same time, the output protection module performs output protection on the signal judgment and output module, and the transient anti-interference module performs transient anti-interference on the signal judgment and output module to ensure the normal application of the product under complex vehicle conditions.

[0008] Preferably, the LC oscillation module is used to generate resonance and control the vehicle proximity inductive sensor to be repeatedly turned on and off.

[0009] Preferably, the transient anti-interference module passes the highest level of transient anti-interference test.

[0010] Preferably, the anti-interference module and the anti-interference module of the LC oscillation part and the output part exist independently, the anti-interference module and the high-temperature compensation network act on the LC oscillation module at the same time, and the anti-interference module of the output part and the transient anti-interference module act on the signal judgment and output module at the same time.

[0011] Preferably, the high temperature compensation network 3 is capable of performing temperature compensation compared to a common compensation network.

[0012] A manufacturing process of a high-pressure and high-temperature resistant automotive proximity inductive sensor, the manufacturing process steps are as follows:

[0013] S1: First, the component structure of the vehicle proximity inductive sensor is manufactured and assembled;

[0014] S2: During the assembly process, silicone is poured into the coil soldering points and their surroundings to ensure that the coil soldering points will not be affected by the glue;

[0015] S3: Before pouring glue, the circuit board needs to be wrapped with raw tape to prevent the components on the circuit board from contacting the glue over a large area and prevent them from being forcibly displaced by the glue during rapid temperature changes;

[0016] S4: The structure uses an integrated all-stainless steel shell, the part extending into the cylinder body is thickened, and a high-hardness standard shell is selected to withstand greater installation torque.

[0017] Preferably, the glue poured in step S3 is liquid silicone glue.

[0018] Preferably, the pouring glue involved in step S3 is a glue that is chemically stable at high temperatures and can maintain elasticity and structural strength after curing under high temperature conditions.

[0019] The beneficial effects of this patent are:

[0020] 1. Based on the common principle, the transient anti-interference circuit is upgraded to meet the application in the vehicle environment, high temperature optimization and related process upgrades are carried out to meet the use requirements in the environment of 100-120℃, and the high-pressure resistant structure design is carried out to meet the oil pressure environment of 50Mpa.

[0021] 2. In addition to adding anti-interference modules in the LC oscillation part and the output part, a transient anti-interference module is also cascaded in the output part to pass the highest level of transient anti-interference test and improve the normal application of the product under complex vehicle conditions.

[0022] 3. Use a high temperature compensation network for temperature compensation, which can more accurately fit the electrical characteristics of the coil in a high temperature environment and can accurately perform temperature compensation to achieve high temperature stability.

[0023] 4. Use an integrated all-stainless steel shell, thicken the part that extends into the cylinder body, and use a high-hardness standard shell to withstand greater installation torque and improve its high-pressure resistance.

[0024] 5. It is not only applicable to wheels, but also to the detection of the mechanical arm of concrete conveyors and the mechanical arm of cranes, with a wide range of applications.

[0025] In summary, the automotive proximity inductive sensor can be used in operating temperatures as high as 120°C, has strong transient anti-interference capabilities, a wide range of applications, the ability to withstand 50Mpa oil pressure, and high stability in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Figure 1 It is a working principle diagram of the present invention.

[0028] Numbers in the figure: 1. Anti-interference module; 2. LC oscillation module; 3. High temperature compensation network; 4. Signal amplification and processing module; 5. Short-circuit protection module; 6. Anti-interference module; 7. Signal judgment and output module; 8. Output protection module; 9. Transient anti-interference module. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by those skilled in the art belong to the protection scope of the present invention.

[0030] Reference Figure 1 A high-voltage and high-temperature resistant automotive proximity inductive sensor comprises an LC oscillation part, a signal processing part and an output part, wherein the LC oscillation part comprises an anti-interference module 1, an LC oscillation module 2 and a high-temperature compensation network 3, wherein the LC oscillation module 2 is connected to the anti-interference module 1, the high-temperature compensation network 3 and the signal amplification and processing module 4, wherein the LC oscillation module 2 performs signal anti-interference through the anti-interference module 1, and the LC oscillation module 2 performs temperature compensation for the electrical characteristics of the coil in the LC oscillation module 2 in a high-temperature environment through the high-temperature compensation network 3, thereby achieving high-temperature stability, and the LC oscillation module 2 transmits the signal to the signal amplification and processing module 4;

[0031] The signal processing part includes a signal amplification and processing module 4 and a short-circuit protection module 5. The signal amplification and processing module 4 is connected to the short-circuit protection module 5, the LC oscillation module 2 and the signal judgment and output module 7. The signal amplification and processing module 4 is used to receive the signal transmitted by the LC oscillation module 2, and amplify and process the signal. The short-circuit protection module 5 performs short-circuit protection on the signal amplification and processing module 4 to ensure the normal operation of the signal amplification and processing module 4. The signal amplified and processed by the signal amplification and processing module 4 is transmitted to the signal judgment and output module 7.

[0032] The output part includes a signal judgment and output module 7, an output protection module 8, a transient anti-interference module 9 and an anti-interference module 6. The signal judgment and output module 7 is connected with the output protection module 8, the transient anti-interference module 9, the anti-interference module 6 and the signal amplification and processing module 4. The signal judgment and output module 7 receives the signal of the signal amplification and processing module 4, and judges and outputs the signal, and the anti-interference module 6 performs anti-interference on the signal judgment and output module 7. At the same time, the output protection module 8 performs output protection on the signal judgment and output module 7, and the transient anti-interference module 9 performs transient anti-interference on the signal judgment and output module 7 to ensure the normal application of the product under complex vehicle conditions.

[0033] Furthermore, the LC oscillation module 2 is used to generate resonance and control the vehicle proximity inductive sensor to be repeatedly turned on and off. The transient anti-interference module 9 passes the highest level of transient anti-interference test. The anti-interference module 1 and the anti-interference module 6 of the LC oscillation part and the output part exist independently. The anti-interference module 1 and the high-temperature compensation network 3 act on the LC oscillation module 2 at the same time, and the anti-interference module 6 of the output part and the transient anti-interference module 9 act on the signal judgment and output module 7 at the same time. Compared with the ordinary compensation network, the high-temperature compensation network 3 can perform temperature compensation.

[0034] A manufacturing process of a high-pressure and high-temperature resistant automotive proximity inductive sensor, the manufacturing method is as follows:

[0035] S1: First, the component structure of the vehicle proximity inductive sensor is manufactured and assembled;

[0036] S2: During the assembly process, silicone is poured into the coil soldering points and their surroundings to ensure that the coil soldering points will not be affected by the glue;

[0037] S3: Before pouring glue, the circuit board needs to be wrapped with raw tape to prevent the components on the circuit board from contacting the glue over a large area and prevent them from being forcibly displaced by the glue during rapid temperature changes;

[0038] S4: The structure uses an integrated all-stainless steel shell, the part extending into the cylinder body is thickened, and a high-hardness standard shell is selected to withstand greater installation torque.

[0039] Furthermore, the pouring glue involved in step S3 is liquid silicone glue. The pouring glue involved in step S3 is a glue that is chemically stable at high temperatures and can maintain the elasticity and structural strength of the glue after curing under high temperature conditions.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than a limiting technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A high-voltage and high-temperature resistant automotive proximity inductive sensor, comprising an LC oscillation part, a signal processing part and an output part, characterized in that: The LC oscillation part comprises an anti-interference module (1), an LC oscillation module (2) and a high-temperature compensation network (3); the LC oscillation module (2) is connected to the anti-interference module (1), the high-temperature compensation network (3) and the signal amplification and processing module (4); the LC oscillation module (2) performs signal anti-interference through the anti-interference module (1); and the LC oscillation module (2) performs temperature compensation for the electrical characteristics of the coil in the LC oscillation module (2) in a high-temperature environment through the high-temperature compensation network (3) to achieve high-temperature stability; and the LC oscillation module (2) transmits the signal to the signal amplification and processing module (4); The signal processing part comprises a signal amplification and processing module (4) and a short-circuit protection module (5); the signal amplification and processing module (4) is connected to the short-circuit protection module (5), the LC oscillation module (2) and the signal judgment and output module (7); the signal amplification and processing module (4) is used to receive the signal transmitted by the LC oscillation module (2), and amplify and process the signal; the short-circuit protection module (5) performs short-circuit protection on the signal amplification and processing module (4) to ensure the normal operation of the signal amplification and processing module (4); and the signal amplified and processed by the signal amplification and processing module (4) is transmitted to the signal judgment and output module (7); The output part comprises a signal judgment and output module (7), an output protection module (8), a transient anti-interference module (9) and an anti-interference module (6); the signal judgment and output module (7) is connected to the output protection module (8), the transient anti-interference module (9), the anti-interference module (6) and the signal amplification and processing module (4); the signal judgment and output module (7) receives the signal of the signal amplification and processing module (4), judges and outputs the signal, and the anti-interference module (6) performs anti-interference on the signal judgment and output module (7); at the same time, the output protection module (8) performs output protection on the signal judgment and output module (7); and the transient anti-interference module (9) performs transient anti-interference on the signal judgment and output module (7), thereby ensuring the normal application of the product under complex vehicle-mounted conditions.

2. The high-voltage and high-temperature resistant vehicle proximity inductive sensor according to claim 1, characterized in that: The LC oscillation module (2) is used to generate resonance and control the vehicle proximity inductive sensor to be repeatedly turned on and off.

3. The high-voltage and high-temperature resistant vehicle proximity inductive sensor according to claim 1, characterized in that: The transient anti-interference module (9) passes the highest level of transient anti-interference test.

4. The high-voltage and high-temperature resistant vehicle proximity inductive sensor according to claim 1, characterized in that: The anti-interference module (1) and the anti-interference module (6) of the LC oscillation part and the output part are both independent, the anti-interference module (1) and the high-temperature compensation network (3) act on the LC oscillation module (2) at the same time, and the anti-interference module (6) of the output part and the transient anti-interference module (9) act on the signal judgment and output module (7) at the same time.

5. The high-voltage and high-temperature resistant vehicle proximity inductive sensor according to claim 1, characterized in that: Compared with ordinary compensation networks, the high temperature compensation network (3) is capable of performing temperature compensation.

6. A manufacturing process for a high-pressure and high-temperature resistant automotive proximity inductive sensor according to any one of claims 1 to 5, characterized in that: The manufacturing process steps are as follows: S1: First, the component structure of the vehicle proximity inductive sensor is manufactured and assembled; S2: During the assembly process, silicone is poured into the coil soldering points and their surroundings to ensure that the coil soldering points will not be affected by the glue; S3: Before pouring glue, the circuit board needs to be wrapped with raw tape to prevent the components on the circuit board from contacting the glue over a large area and prevent them from being forcibly displaced by the glue during rapid temperature changes; S4: Its structure uses an integrated all-stainless steel shell, the part extending into the cylinder body is thickened, and a high-hardness standard shell is selected to withstand greater installation torque.

7. The manufacturing process according to claim 6, characterized in that: The injection glue involved in step S3 is liquid silicone glue.

8. The manufacturing process according to claim 6, characterized in that: The pouring glue involved in the step S3 is selected from glue that is chemically stable at high temperatures and can maintain elasticity and required structural strength after curing under high temperature conditions.

Images