CN110553795B - System and method for testing tightness, pressure resistance and salt tolerance of sensor - Google Patents
System and method for testing tightness, pressure resistance and salt tolerance of sensor Download PDFInfo
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- CN110553795B CN110553795B CN201910672148.2A CN201910672148A CN110553795B CN 110553795 B CN110553795 B CN 110553795B CN 201910672148 A CN201910672148 A CN 201910672148A CN 110553795 B CN110553795 B CN 110553795B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a test system and a test method for the tightness, pressure resistance and salt tolerance of a sensor, wherein the test system comprises: 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-pressure air supply who has the manometer through the air guide channel, the sensor has positive terminal and negative terminal, during the test, the sensor submerges in the salt solution, the positive negative terminal short circuit back of sensor is as the first utmost point of test circuit, a terminal of ammeter is connected through the cable, test electrode also submerges in the salt solution, as the second pole of test circuit, a terminal of power is connected through the cable, another terminal of power is connected, thereby form test circuit.
Description
Technical Field
The invention relates to the field of sensor testing, in particular to a system and a method for testing the sealing performance, the pressure resistance and the salt tolerance of a sensor.
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
Aiming at the defects of the prior art, the invention provides a system and a method for testing the sealing performance and the pressure-resistant salt tolerance of a sensor aiming at environmental factors of the vehicle sensor in the actual working process.
In order to achieve the above object, the present invention provides a system for testing the sealing performance and the salt and pressure resistance of a sensor, 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-pressure air supply who has the manometer through the air guide channel, the sensor has positive terminal and negative terminal, during the test, the sensor submerges in the salt solution, the positive negative terminal short circuit back of sensor is as the first utmost point of test circuit, a terminal of ammeter is connected through the cable, test electrode also submerges in the salt solution, as the second pole of test circuit, a terminal of power is connected through the cable, another terminal of power is connected, thereby form test circuit.
The invention also provides a system for testing the tightness, pressure resistance and salt tolerance of the sensor, which comprises: the pressure-resistant container is filled with salt solution, the top of the pressure-resistant container is provided with an opening, a high-pressure air source with a pressure gauge is connected through an air guide channel, the sensor is provided with a positive terminal and a negative terminal, the positive terminal of the sensor is connected with one terminal of the ammeter through a cable, the negative terminal is connected with one terminal of the power supply through a cable, and the other terminal of the power supply is connected with the other terminal of the ammeter, so that a test circuit is formed.
The salt solution is a 6% strength NaCl solution.
The invention also provides a method for testing the sealing performance and the pressure resistance and the salt resistance of the sensor, which comprises the following steps:
s11: preparing a pressure-resistant container, wherein saline solution is filled, and the depth of the saline solution is enough to immerse the whole sensor and the front section of a cable connecting the positive terminal and the negative terminal of the sensor;
s12: forming a test circuit, utilizing a cable to short-circuit the positive terminal and the negative terminal of the sensor, connecting the positive terminal and the negative terminal of the sensor with one terminal of the ammeter through the cable, connecting the test electrode with one terminal of a power supply through the cable, and connecting the other terminal of the power supply with the other terminal of the ammeter;
s13: at room temperature, immersing the whole sensor and the front section of the cable in a saline solution, and immersing the test electrode in the saline solution;
s14: opening a high-pressure air source, pressurizing the pressure container, and maintaining for a certain time;
s15: and turning on a power supply, providing 16V direct-current voltage for the test circuit, measuring and recording a current value by using a current meter, if the current value is greater than or equal to a first threshold value, indicating that the sealing property and the voltage-resistant and salt-resistant property of the sensor cannot meet the requirements, and if the current value is less than the first threshold value, indicating that the sealing property and the voltage-resistant and salt-resistant property of the sensor meet the requirements.
In step S15, the first threshold value is 1 μ a.
The invention also provides a method for testing the sealing performance and the pressure resistance and the salt resistance of the sensor, which comprises the following steps:
s21: forming a test circuit, connecting a positive terminal of the sensor to one terminal of the ammeter through a cable, connecting a negative terminal of the sensor to one terminal of a power supply through a cable, and connecting the other terminal of the power supply to the other terminal of the ammeter;
s22: turning on a power supply, providing 16V direct current voltage for the test circuit, and measuring and recording a first current value by using a current meter;
s23: preparing a pressure-resistant container, wherein saline solution is filled, and the depth of the saline solution is enough to immerse the whole sensor and the front section of a cable connecting the positive terminal and the negative terminal of the sensor;
s24: submerging the entire sensor and the front section of the cable in a saline solution at room temperature;
s25: opening a high-pressure air source, pressurizing the pressure container, and maintaining for a certain time;
s26: the power supply is turned on, 16V direct current voltage is provided for the test circuit, a second current value is measured and recorded by utilizing a 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 sealing performance and the withstand voltage and the salt tolerance of the sensor cannot meet the requirement, an internal circuit of the sensor is short-circuited, if the ratio a is smaller than or equal to a third threshold value, the sealing performance and the withstand voltage and the salt tolerance of the sensor cannot meet the requirement, 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 withstand voltage and the salt tolerance of the sensor can meet the requirement, and the second threshold value is larger than the third threshold value.
In step S14 or step S25, the pressure is raised to 7.2. + -. 0.8PSI for 4-6 minutes.
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 diagram 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 flow chart of a testing method according to a first embodiment of the invention;
FIG. 3 is a schematic diagram of a test system according to the present invention, connected in a manner according to a second embodiment of the present invention;
fig. 4 is a flow chart of a testing method according to a second embodiment of the invention.
Detailed Description
In order to make the technical solution of the present invention clearer and more clear, the following detailed description is made with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.
Fig. 1 shows a schematic structural diagram of a test system according to the invention, which is connected in a manner according to a first embodiment of the invention. As shown in fig. 1, the system for testing the sealing performance and the pressure and salt resistance 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 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.
Fig. 2 is a flow chart of a testing method according to a first embodiment of the invention. As shown in fig. 2, the method comprises the steps of:
s11: a pressure-resistant container in which a saline solution is filled is prepared. The saline solution is deep enough to submerge the entire sensor and the front section of the cable connecting the positive and negative terminals of the sensor, for example the front 30mm of the cable. The salt solution can be 6% NaCl solution, so that the corrosion condition of the vehicle sensor under the real working condition environment is simulated, and an electrolytic current path is provided for the test circuit.
S12: and forming a test circuit, utilizing a cable to short-circuit the positive terminal and the negative terminal of the sensor, connecting the positive terminal and the negative terminal of the sensor with one terminal of the ammeter through the cable, connecting the test electrode with one terminal of a power supply through the cable, and connecting the other terminal of the power supply with the other terminal of the ammeter.
S13: at room temperature, the entire sensor and the front section of the cable were immersed in saline solution, and the test electrode was immersed in saline solution.
S14: the high pressure gas source is turned on and the pressure vessel is pressurized to raise the pressure in the pressure vessel to, for example, 7.2. + -. 0.8PSI for a period of time, for example, 4-6 minutes. The sensor is immersed in the salt 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.
S15: the power supply was turned on, a dc voltage of 16V was applied to the test circuit, and the current value was measured and recorded using 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, the housing of the sensor may be broken but the internal circuit is not exposed, and if the test system and the test method according to the first embodiment of the present invention are 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 current meter. 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.
Therefore, the present invention provides a test system and a test method according to the second embodiment, which can test the sensor for the above situation.
Fig. 3 shows a schematic structural diagram of a test system according to the invention, which is connected in a manner according to a second embodiment of the invention. As shown in fig. 3, 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.
Fig. 4 is a flow chart of a testing method according to a second embodiment of the invention. As shown in fig. 4, the method comprises the steps of:
s21: a test circuit is formed by connecting the positive terminal of the sensor to one terminal of the ammeter through a cable, connecting the negative terminal of the sensor to one terminal of the power supply through a cable, and connecting the other terminal of the power supply to the other terminal of the ammeter.
S22: the power supply was turned on, a dc voltage of 16V was applied to the test circuit, and a first current value was measured and recorded using a current meter.
Step S23: a pressure-resistant container in which a saline solution is filled is prepared. The saline solution is deep enough to submerge the entire sensor and the front section of the cable connecting the positive and negative terminals of the sensor, for example the front 30mm of the cable. The salt solution can be 6% NaCl solution, so that the corrosion condition of the vehicle sensor under the real working condition environment is simulated, and an electrolytic current path is provided for the test circuit.
S24: the entire sensor and the front section of the cable were immersed in saline solution at room temperature.
S25: the high pressure gas source is turned on and the pressure vessel is pressurized to raise the pressure in the pressure vessel to, for example, 7.2. + -. 0.8PSI for a period of time, for example, 4-6 minutes. The sensor is immersed in the salt 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.
S26: the power supply was turned on, a dc voltage of 16V was applied to the test circuit, and a second current value was measured and recorded 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 invention can simulate the real working condition environment of the vehicle sensor, test the tightness and the pressure-resistant salt tolerance of the sensor under the conditions of water immersion, saline-alkali corrosion and the like, shorten the test time and improve the test efficiency.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A test method applied to a test system for the tightness, pressure resistance and salt tolerance of a sensor comprises the following steps: the pressure container, the ammeter, the power, the sensor that awaits measuring, it has the salt solution to add in the pressure container, the top of pressure container is provided with the opening, connect the high-pressure air supply who has the manometer through the air guide channel, the sensor has positive terminal and negative terminal, during the test, the sensor submerges in the salt solution, the positive negative terminal short circuit of sensor is as the first utmost point of test circuit, connect a terminal of ammeter through the cable, test electrode also submerges in the salt solution, as the second utmost point of test circuit, connect a terminal of power through the cable, another terminal of power is connected another terminal of ammeter, thereby form test circuit, a serial communication port, the method includes the following steps:
s11: preparing a pressure-resistant container, wherein saline solution is filled, and the depth of the saline solution is enough to immerse the whole sensor and the front section of a cable connecting the positive terminal and the negative terminal of the sensor;
s12: forming a test circuit, utilizing a cable to short-circuit the positive terminal and the negative terminal of the sensor, connecting the positive terminal and the negative terminal of the sensor with one terminal of the ammeter through the cable, connecting the test electrode with one terminal of a power supply through the cable, and connecting the other terminal of the power supply with the other terminal of the ammeter;
s13: at room temperature, immersing the whole sensor and the front section of the cable in a saline solution, and immersing the test electrode in the saline solution;
s14: opening a high-pressure air source, pressurizing the pressure container, and maintaining for a certain time;
s15: and turning on a power supply, providing 16V direct-current voltage for the test circuit, measuring and recording a current value by using a current meter, if the current value is greater than or equal to a first threshold value, indicating that the sealing property and the voltage-resistant and salt-resistant property of the sensor cannot meet the requirements, and if the current value is less than the first threshold value, indicating that the sealing property and the voltage-resistant and salt-resistant property of the sensor meet the requirements.
2. The test method of claim 1, wherein the first threshold value is 1 μ a in step S15.
3. The test method according to claim 1 or 2, wherein in step S14, the pressure is raised to 7.2 ± 0.8PSI for 4-6 minutes.
4. The test method according to claim 1 or 2, the salt solution being a 6% strength NaCl solution.
5. A test method applied to a test system for the tightness, pressure resistance and salt tolerance of a sensor comprises the following steps: the pressure-resistant container, the ammeter, the power, the sensor that awaits measuring, it has the salt solution to add in the pressure-resistant container, pressure-resistant container's top is provided with the opening, connect the high-pressure gas source that has the manometer through the air guide passageway, 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 of power is another terminal of ammeter to form test circuit, its characterized in that, the method includes the following steps:
s21: forming a test circuit, connecting a positive terminal of the sensor to one terminal of the ammeter through a cable, connecting a negative terminal of the sensor to one terminal of a power supply through a cable, and connecting the other terminal of the power supply to the other terminal of the ammeter;
s22: turning on a power supply, providing 16V direct current voltage for the test circuit, and measuring and recording a first current value by using a current meter;
s23: preparing a pressure-resistant container, wherein saline solution is filled, and the depth of the saline solution is enough to immerse the whole sensor and the front section of a cable connecting the positive terminal and the negative terminal of the sensor;
s24: submerging the entire sensor and the front section of the cable in a saline solution at room temperature;
s25: opening a high-pressure air source, pressurizing the pressure container, and maintaining for a certain time;
s26: the power supply is turned on, 16V direct current voltage is provided for the test circuit, a second current value is measured and recorded by utilizing a 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 sealing performance and the withstand voltage and the salt tolerance of the sensor cannot meet the requirement, an internal circuit of the sensor is short-circuited, if the ratio a is smaller than or equal to a third threshold value, the sealing performance and the withstand voltage and the salt tolerance of the sensor cannot meet the requirement, 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 withstand voltage and the salt tolerance of the sensor can meet the requirement, and the second threshold value is larger than the third threshold value.
6. The test method of claim 5, wherein in step S25, the pressure is raised to 7.2 ± 0.8PSI for 4-6 minutes.
7. The test method of claim 5, the salt solution being a 6% strength NaCl solution.
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