CN210774508U

CN210774508U - Test system for tightness, pressure resistance and salt tolerance of sensor

Info

Publication number: CN210774508U
Application number: CN201921184094.7U
Authority: CN
Inventors: 朱建荣; 韦水明
Original assignee: Suzhou Tianmuai Automobile Part Co ltd
Current assignee: Suzhou Tianmuai Automobile Part Co ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-06-16
Anticipated expiration: 2029-07-24

Abstract

The utility model provides a test system of sensor leakproofness and withstand voltage salt tolerance, include: the pressure vessel, the ammeter, a power supply, the sensor to be tested, salt solution is filled in the pressure vessel, the top of the pressure vessel is provided with an opening, a high-pressure air source with a pressure gauge is connected through an air guide channel, the high-pressure air source can pressurize the pressure vessel, the air pressure in the pressure vessel is increased to 7.2 +/-0.8 PSI, the sensor is provided with a positive electrode terminal and a negative electrode terminal, during testing, the sensor is immersed in the salt solution, the positive electrode terminal and the negative electrode terminal of the sensor are used as a first electrode of a testing circuit after being short-circuited, one terminal of the ammeter is connected through a cable, a testing electrode is also immersed in the salt solution and used as a second electrode of the testing circuit, one terminal of the power supply is connected through the cable, the other terminal of the.

Description

Test system for tightness, pressure resistance and salt tolerance of sensor

Technical Field

The utility model relates to a sensor test field especially indicates a test system of sensor leakproofness and withstand voltage salt tolerance.

Background

The working conditions and environments of the vehicle are various, and the vehicle often faces severe environments such as rain, snow and the like. Even so, it is necessary to ensure the safety of the vehicle for a long time in various environments. Many vehicles currently rely on the measurement data of sensors, which are increasingly important for the vehicle, to perform operations. When the sensor works in various environments, the sensor is influenced by various factors such as rain, snow, dust, saline-alkali corrosion and the like. The tightness of the sensor housing is a concern to ensure long-term proper operation of the sensor. The quality of the sealing condition determines whether the sensor can work normally or not to a great extent. If the sensor is not sealed well, the penetration of dust and liquid can be caused, the sensor circuit is short-circuited if the sensor is not sealed well, the sensor is damaged, the sensor measurement data is inaccurate if the sensor is damaged, and then a huge safety risk is brought to a vehicle system which is operated depending on the measurement data of the sensor.

Some standards or solutions have been proposed in the prior art for testing the tightness of the device. However, the existing test scheme is not designed for the sensor on the vehicle, the considered influence factors are few, the designed test environment is single, the measurement process takes too long, generally more than one hour, and the test efficiency is influenced.

Disclosure of Invention

To prior art's defect, the utility model discloses environmental factor to vehicle sensor faces in the actual work process provides a test system of sensor leakproofness and withstand voltage salt tolerance, the utility model discloses can simulate vehicle sensor's true operating mode environment, test sensor leakproofness and withstand voltage salt tolerance under the environment such as soaking, saline and alkaline corrosion have shortened test time, have improved efficiency of software testing.

In order to achieve the above object, the utility model provides a test system of sensor leakproofness and withstand voltage salt tolerance, include: the pressure vessel, the ammeter, a power supply, the sensor to be tested, salt solution is filled in the pressure vessel, the top of the pressure vessel is provided with an opening, a high-pressure air source with a pressure gauge is connected through an air guide channel, the high-pressure air source can pressurize the pressure vessel, the air pressure in the pressure vessel is increased to 7.2 +/-0.8 PSI, the sensor is provided with a positive electrode terminal and a negative electrode terminal, during testing, the sensor is immersed in the salt solution, the positive electrode terminal and the negative electrode terminal of the sensor are used as a first electrode of a testing circuit after being short-circuited, one terminal of the ammeter is connected through a cable, a testing electrode is also immersed in the salt solution and used as a second electrode of the testing circuit, one terminal of the power supply is connected through the cable, the other terminal of the.

The power supply provides 16V direct current voltage for the test circuit, the current value is measured and recorded by utilizing the current meter, if the current value is larger than or equal to a first threshold value, the sealing performance and the voltage-resistant and salt-resistant performance of the sensor cannot meet the requirements, and if the current value is smaller than the first threshold value, the sealing performance and the voltage-resistant and salt-resistant performance of the sensor can meet the requirements.

The first threshold is 1 μ Α.

The utility model also provides a test system of sensor leakproofness and withstand voltage salt tolerance, include: pressure vessel, the ammeter, a power supply, the sensor that awaits measuring, it has the salt solution to add in the pressure vessel, pressure vessel's top is provided with the opening, connect the high pressurized air source who has the manometer through the air guide channel, high pressurized air source can pressurize pressure vessel, make atmospheric pressure rise to 7.2 0.8PSI in the pressure vessel, the sensor has positive terminal and negative terminal, the positive terminal of sensor passes through a terminal of cable connection ammeter, the negative terminal passes through a terminal of cable connection power, another terminal connection ammeter of power, thereby form test circuit.

The power supply provides 16V direct current voltage for the test circuit, a first current value is measured and recorded by using a current meter, then at room temperature, the whole sensor and the front section of the cable are immersed in saline solution, a high-pressure air source is used for pressurizing the pressure-resistant container, after a certain time is maintained, 16V direct current voltage is provided for the test circuit, a second current value is measured and recorded by using the current meter, the ratio a of the second current value to the first current value is calculated, a is the second current value/the first current value, if the ratio a is larger than or equal to a second threshold value, the tightness and the pressure-resistant and salt-resistant performances of the sensor are not met, the internal circuit of the sensor is short-circuited, if the ratio a is smaller than or equal to a third threshold value, the tightness and the pressure-resistant and salt-resistant performances of the sensor are not met, the internal circuit of the sensor is broken, if the ratio a is larger than the, the tightness and the pressure and salt resistance of the sensor reach the standard, and the second threshold is larger than the third threshold.

The salt solution is a 6% strength NaCl solution.

The features and advantages of the present invention will become apparent by reference to the following drawings and detailed description of specific embodiments of the invention.

Drawings

Fig. 1 is a schematic structural view of a test system according to the present invention, connected in a manner according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a test system according to the present invention, and the connection mode thereof is according to the second embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention clearer and more clear, the following is described in detail with reference to the accompanying drawings, and it should be understood that the embodiments described herein are only used for explaining the present invention, and are not used for limiting the present invention.

Fig. 1 shows a schematic structural diagram of a test system according to the present invention, in which the connection is according to the first embodiment of the present invention. As shown in fig. 1, the test system for the sealing performance and the pressure-resistant and salt-resistant performance of the sensor of the present invention comprises: the pressure-resistant container 1, the ammeter 3, the power supply 4 and the sensor to be measured 5. The pressure-resistant container 1 is filled with a salt solution 2, so that a corrosion condition faced by a real working condition environment of the vehicle sensor is simulated, an electrolytic current path is provided for a test circuit, and the salt solution can be 6% NaCl solution. The top of the pressure container 1 is provided with an opening 6 which is connected with a high-pressure air source (not shown) with a pressure gauge through an air guide channel. The high pressure gas source may pressurize the pressure vessel, raising the pressure of the gas in the pressure vessel, for example, to 7.2 ± 0.8 PSI. The sensor is immersed in the saline solution under higher pressure, so that the immersion effect for a longer time can be simulated in a shorter time, and the test time is greatly shortened, for example, the pressurized state is maintained for 4-6 minutes. The sensor 5 is provided with a positive terminal 8 and a negative terminal 9, during testing, the sensor 5 is immersed in the saline solution 2, the positive terminal and the negative terminal of the sensor 5 are in short circuit and then serve as a first pole of a testing circuit, and one terminal of the ammeter 3 is connected through a cable. The positive and negative terminals are externally provided with insulating layers, and the positive and negative terminals and the cable are insulated from the salt solution 2 except for being electrically connected with the cable. A test electrode 7, also immersed in the saline solution 2, acts as a second pole of the test circuit, connected by a cable to one terminal of the power source 4, the other terminal of the power source 4 being connected to the other terminal of the current meter 3, thus forming a test circuit. The power supply provides a DC voltage of 16V to the test circuit, and the current value is measured and recorded by utilizing a current meter. If the current value is greater than or equal to the first threshold value, the tightness, pressure resistance and salt resistance of the sensor are not required. The first threshold may be 1 μ Α. If the current value is smaller than the first threshold value, the sealing performance and the pressure and salt resistance of the sensor reach the standard.

In practical situations, sometimes the housing of the sensor is broken but the internal circuit is not exposed, and if the test system according to the first embodiment of the present invention is used for testing, a current path is not formed between the internal circuit and the test electrode, and the current value cannot be detected by the ammeter. However, such a degree of breakage of the housing may still cause water or dust to enter, which deteriorates the working environment of the internal circuit of the sensor, and the long-term exposure to the deteriorated working environment may easily cause damage to the internal circuit of the sensor, such as short circuit or open circuit.

For this reason, the present invention provides a test system according to the second embodiment, which can test the sensor for the above situation.

Fig. 2 shows a schematic structural diagram of a test system according to the present invention, in which the connection is according to a second embodiment of the present invention. As shown in fig. 2, the test system includes the same components as the test system shown in fig. 1, except for the connection. According to the second embodiment of the present invention, the positive terminal 8 of the sensor 5 is connected to one terminal of the ammeter 3 through a cable, the negative terminal 9 is connected to one terminal of the power source 4 through a cable, and the other terminal of the power source 4 is connected to the other terminal of the ammeter 3, thereby forming a test circuit.

The power supply provides a DC voltage of 16V to the test circuit, and a first current value is measured and recorded by using a current meter. Then, at room temperature, the whole sensor and the front section of the cable are immersed in a saline solution, the pressure-resistant container is pressurized by using a high-pressure air source, after a certain period of time, a direct-current voltage of 16V is provided for the test circuit, and a second current value is measured and recorded by using a current meter. The ratio a of the second current value to the first current value is calculated, a being the second current value/the first current value. If the ratio a is larger than or equal to the second threshold value, the sealing performance and the pressure and salt resistance of the sensor are not required, and the internal circuit of the sensor is short-circuited. If the ratio a is less than or equal to the third threshold, the tightness, the pressure resistance and the salt resistance of the sensor are not required, and the internal circuit of the sensor is broken. If the ratio a is larger than the third threshold value and smaller than the second threshold value, the sealing performance and the pressure-resistant salt-resistant performance of the sensor reach the standard. The second threshold is greater than the third threshold.

The utility model discloses can simulate vehicle sensor's true operating mode environment, the leakproofness and the withstand voltage salt tolerance of test sensor under environment such as soaking, saline and alkaline corrosion have shortened test time, have improved efficiency of software testing.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.

Claims

1. A test system for tightness, pressure resistance and salt tolerance of a sensor is characterized by comprising: the pressure vessel, the ammeter, a power supply, the sensor to be tested, salt solution is filled in the pressure vessel, the top of the pressure vessel is provided with an opening, a high-pressure air source with a pressure gauge is connected through an air guide channel, the high-pressure air source can pressurize the pressure vessel, the air pressure in the pressure vessel is increased to 7.2 +/-0.8 PSI, the sensor is provided with a positive electrode terminal and a negative electrode terminal, during testing, the sensor is immersed in the salt solution, the positive electrode terminal and the negative electrode terminal of the sensor are used as a first electrode of a testing circuit after being short-circuited, one terminal of the ammeter is connected through a cable, a testing electrode is also immersed in the salt solution and used as a second electrode of the testing circuit, one terminal of the power supply is connected through the cable, the other terminal of the.

2. The test system of claim 1, wherein the power supply supplies a DC voltage of 16V to the test circuit, and the current value is measured and recorded by using a current meter, if the current value is greater than or equal to a first threshold value, the sealing performance and the salt-resistant performance of the sensor are not met, and if the current value is less than the first threshold value, the sealing performance and the salt-resistant performance of the sensor are met.

3. The test system of claim 2, wherein the first threshold is 1 μ Α.

4. A test system for tightness, pressure resistance and salt tolerance of a sensor is characterized by comprising: pressure vessel, the ammeter, a power supply, the sensor that awaits measuring, it has the salt solution to add in the pressure vessel, pressure vessel's top is provided with the opening, connect the high pressurized air source who has the manometer through the air guide channel, high pressurized air source can pressurize pressure vessel, make atmospheric pressure rise to 7.2 0.8PSI in the pressure vessel, the sensor has positive terminal and negative terminal, the positive terminal of sensor passes through a terminal of cable connection ammeter, the negative terminal passes through a terminal of cable connection power, another terminal connection ammeter of power, thereby form test circuit.