CN112697456A - Reliability test method for automobile circuit system - Google Patents
Reliability test method for automobile circuit system Download PDFInfo
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- CN112697456A CN112697456A CN202011456264.XA CN202011456264A CN112697456A CN 112697456 A CN112697456 A CN 112697456A CN 202011456264 A CN202011456264 A CN 202011456264A CN 112697456 A CN112697456 A CN 112697456A
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- vehicle
- temperature
- circuit system
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Power Engineering (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention aims to provide an automobile circuit system reliability test method for ensuring that faults and potential safety hazards of a circuit system cannot occur when a user uses a vehicle. After the test, whether the electric appliance plug-in units and the whole vehicle wire harness are buckled with the vehicle body to cause the shedding phenomenon or not, whether the electric appliance functions are normal or not, whether a circuit system has the potential risk of being burnt and the like are checked.
Description
Technical Field
The invention relates to the technical field of automobile performance tests, in particular to a method for testing the reliability of an automobile circuit system.
Background
With the development of society, automobiles enter an intelligent era, electrical equipment on the automobiles is increased day by day, and the popularization degree and the use frequency of the automobiles are also increased more and more. Whether the buckle drops in the circuit system, whether the connector is intact etc. directly relate to the reliability of electrical apparatus, if the user appears above-mentioned problem in the use can directly influence the security of whole car, therefore whole car needs test circuit system reliability before dispatching from the factory.
Disclosure of Invention
The invention aims to provide an automobile circuit system reliability test method which can ensure that a user can not have circuit system faults and potential safety hazards when using a vehicle.
In order to achieve the purpose, the invention adopts the technical scheme that: a reliability test method for an automobile circuit system comprises the following steps:
A) preparing a test vehicle, checking whether all electronic and electric appliance functional performances of a circuit system of the test vehicle are normal, and if so, performing the step B);
B) arranging temperature, current and voltage sensors in the circuit system, and debugging;
C) controlling the on-off of each loop of a vehicle circuit system, and recording the working current of each electrical appliance in normal working after the vehicle is started through a current sensor;
D) 4 tires of a test vehicle are placed on 4 actuators of a four-upright-column vibration rack through a tray, and the actuators receive input signals to generate corresponding excitation which is applied to the whole vehicle through the tires;
E) different temperature gradients are arranged in the environment bin to simulate high and low temperature severe environments encountered by users in the actual vehicle using process, and the temperature sensor monitors the working temperature of each electric appliance loop in real time;
F) whether the buckle of the circuit system of the vehicle is detected to fall off or not, whether the connector is intact or not, whether each electrical appliance works normally or not and the like.
In the scheme, the four-upright-column vibration rack is mainly used for simulating the vibration in the Z direction of the vehicle in different temperature ranges after the vehicle is started, the current, the voltage and the temperature of each electric appliance loop of the vehicle are monitored in real time, and the risk of a whole vehicle circuit system is evaluated and analyzed through data. After the test, whether the electric appliance plug-in units and the whole vehicle wire harness are buckled with the vehicle body to cause the shedding phenomenon or not, whether the electric appliance functions are normal or not, whether a circuit system has the potential risk of being burnt and the like are checked.
Drawings
FIG. 1 is a flow chart of a method for testing reliability of a circuit system.
Detailed Description
As shown in fig. 1, a method for testing the reliability of an automotive circuit system includes the following steps:
A) preparing a test vehicle, checking whether all electronic and electric appliance functional performances of a circuit system of the test vehicle are normal, and if so, performing the step B); the vehicle requirement is that the whole car circuit system tests the car, and all electronic appliance function is normal, and each electrical apparatus is the newest state, and all plug-ins all contact well, and each buckle and the normal joint of automobile body confirm the vehicle to carry the piece one by one before the experiment, ensure that all kinds of spare accord with the assembly requirement.
B) Arranging temperature, current and voltage sensors in the circuit system, and debugging;
C) controlling the on-off of each loop of a vehicle circuit system, and recording the working current of each electrical appliance in normal working after the vehicle is started through a current sensor;
D) 4 tires of a test vehicle are placed on 4 actuators of a four-upright-column vibration rack through a tray, and the actuators receive input signals to generate corresponding excitation which is applied to the whole vehicle through the tires;
E) different temperature gradients are arranged in the environment bin to simulate high and low temperature severe environments encountered by users in the actual vehicle using process, and the temperature sensor monitors the working temperature of each electric appliance loop in real time;
F) whether the buckle of the circuit system of the vehicle is detected to fall off or not, whether the connector is intact or not, whether each electrical appliance works normally or not and the like.
The four-upright-column vibration rack is widely applied to the field of automobile fatigue testing since the first appearance in 1962, in the road driving process of a vehicle, the fatigue of parts such as a vehicle body, a vehicle frame, a cockpit and the like is usually caused by the vertical input load of a road surface, the four-upright-column vibration rack is simulated by applying excitation by using a vertical actuator under a wheel, the road load can be well reproduced, the utilization rate of time and resources is high, and the repeatability is good. The test method mainly comprises the steps of simulating the vehicle starting by using the four-upright-column vibration rack, loading Z-direction vibration on the vehicle in different temperature ranges, monitoring the current, voltage and temperature of each electric appliance loop of the vehicle in real time, and evaluating and analyzing the risk of a whole vehicle circuit system through data. After the test, whether the electric appliance plug-in units and the whole vehicle wire harness are buckled with the vehicle body to cause the shedding phenomenon or not, whether the electric appliance functions are normal or not, whether a circuit system has the potential risk of being burnt and the like are checked.
The main components of the test are shown in table one:
watch 1
| Serial number | Name (R) | Main content |
| 1 | High-low temperature environment bin | -40℃～80℃ |
| 2 | Four-column vibration rack | Providing 0 to 100Hz vibrationFrequency of |
| 3 | Temperature sensor | Thermocouple |
| 4 | Current sensor | Hall current sensor |
| 5 | Instantaneous interruption instrument | Detecting on-off of wiring harness |
And D), the input signal in the step D) is a displacement signal of the actuating cylinder, the displacement signal is a road load of a target obtained by a specified test field or the road surface driving of a user, and the iteration is carried out until the output signal and the target signal reach the expected requirements.
In order to be more close to the actual use condition of a user, the displacement signals of the actuating cylinders of the actuators are random spectrums acquired by a road spectrum, and the random spectrums comprise T7 high-speed loops, T8 strengthened durable roads, T9 ramps and other auxiliary roads.
The output signal is a displacement signal of the vehicle shaft head or an acceleration signal of the shaft head.
The maximum temperature which can be borne by the wiring harness of the front cabin is less than or equal to 120 ℃, the temperature which can be borne by the wiring harness of the passenger cabin is less than or equal to 85 ℃, the temperature of the environmental cabin is not more than 85 ℃, and the test time is 30 days. Different environment bin temperature gradients are set to simulate high and low temperature severe environments encountered by users in the process of actually using the vehicle. The test method simulates the road condition of a vehicle of hundreds of thousands of kilometers, the test time is 30 days, and the specific environmental temperature and the test time are shown in the table two:
watch two
| Ambient temperature (. degree. C.) | In proportion of | Time (h) |
| -40 | 6％ | 43.2 |
| 23 | 20％ | 144 |
| 40 | 65％ | 468 |
| 75 | 8％ | 57.6 |
| 80 | 1％ | 7.2 |
The ambient temperature has a large influence on the rated current of the fuse and on the allowable current through the wire. Under the low temperature condition, buckle to pencil and automobile body connection, the connection of connector produces the influence, and the pencil hardens, and violent vibration can cause circuit system trouble in addition. However, the heat generated by the wire in the low-temperature state of the vehicle is not enough to raise the temperature of the wire, and the temperature of the wire does not need to be monitored under the low-temperature condition in all tests.
Furthermore, the vibration frequency of the random spectrum is 0-100 Hz.
In order to ensure the test safety, if the temperature of the wire harness detected by the temperature sensor exceeds the design temperature in the test process, or a transient interruption instrument detects current sudden change or interruption, or the temperature of an electric appliance loop is increased or ablated, the test is stopped in time, and the reason is searched. The loop current of each electrical appliance is monitored in real time through the current sensor, and the comparison with the working current of the electrical appliance in a normal temperature environment is facilitated. If sudden change or interruption of the current is found in the test process, the reason should be searched in time, so that danger is avoided in the test process; monitoring the working temperature of each electric appliance loop in real time through a temperature sensor, and if the phenomenon of temperature rise or ablation of the electric appliance loops is found in the test process, stopping the test in time; and if the conditions allow, the working voltage of each electric appliance loop should be monitored in real time, so that the working state of each electric appliance can be conveniently analyzed.
In the system, the temperature sensor is a K-type thermocouple, and has the advantages of good linearity, large thermoelectromotive force, high sensitivity, good stability and uniformity, strong oxidation resistance, low price and the like. The measurement temperature is 0-1300 ℃, the basic error is +/-0.75 percent, and the test requirement is completely met. The current sensor is a Hall current sensor, and the Hall current sensor has the main advantages that the measurement can be carried out under the condition of not damaging and interfering the original circuit, and the Hall current sensor has good electrical isolation characteristics; the precision is high, and the precision is better than 1% in a working temperature area, so that the precision is suitable for measuring any waveform; the linearity is good and is better than 0.1 percent.
Claims (7)
1. A reliability test method for an automobile circuit system comprises the following steps:
A) preparing a test vehicle, checking whether all electronic and electric appliance functional performances of a circuit system of the test vehicle are normal, and if so, performing the step B);
B) arranging temperature, current and voltage sensors in the circuit system, and debugging;
C) controlling the on-off of each loop of a vehicle circuit system, and recording the working current of each electrical appliance in normal working after the vehicle is started through a current sensor;
D) 4 tires of a test vehicle are placed on 4 actuators of a four-upright-column vibration rack through a tray, and the actuators receive input signals to generate corresponding excitation which is applied to the whole vehicle through the tires;
E) different temperature gradients are arranged in the environment bin to simulate high and low temperature severe environments encountered by users in the actual vehicle using process, and the temperature sensor monitors the working temperature of each electric appliance loop in real time;
F) whether the buckle of the circuit system of the vehicle is detected to fall off or not, whether the connector is intact or not, whether each electrical appliance works normally or not and the like.
2. The automotive electrical system reliability test method of claim 1, characterized in that: and D), the input signal in the step D) is a displacement signal of the actuating cylinder, the displacement signal is a road load of a target obtained by a specified test field or the road surface driving of a user, and the iteration is carried out until the output signal and the target signal reach the expected requirements.
3. The method for testing the reliability of an automotive electrical system according to claim 2, characterized in that: the displacement signals of the actuating cylinders of the actuators are random spectrums acquired by road spectrums and comprise T7 high-speed loops, T8 strengthened durable roads, T9 ramps and other auxiliary roads.
4. The method for testing the reliability of an automotive electrical system according to claim 2, characterized in that: the output signal is a displacement signal of the vehicle shaft head or an acceleration signal of the shaft head.
5. The automotive electrical system reliability test method of claim 1, characterized in that: the temperature of the environmental chamber should not exceed 85 ℃, and the test time is 30 days.
6. The automotive electrical system reliability test method of claim 3, characterized in that: the vibration frequency of the random spectrum is 0-100 Hz.
7. The automotive electrical system reliability test method according to any one of claims 1 to 6, characterized in that: if the temperature of the wire harness detected by the temperature sensor exceeds the design temperature in the test process, or the instantaneous interruption instrument detects sudden change or interruption of current, or the temperature of an electric appliance loop is increased or ablated, the test is stopped in time, and the reason is searched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011456264.XA CN112697456A (en) | 2020-12-10 | 2020-12-10 | Reliability test method for automobile circuit system |
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|---|---|---|---|
| CN202011456264.XA CN112697456A (en) | 2020-12-10 | 2020-12-10 | Reliability test method for automobile circuit system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115061068A (en) * | 2022-06-06 | 2022-09-16 | 中国第一汽车股份有限公司 | Finished automobile wire harness overload testing and evaluating method |
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|---|---|---|---|---|
| EP0299217A2 (en) * | 1987-07-16 | 1989-01-18 | Carl Schenck Ag | Vibration testing stand for vehicles, especially for passenger cars |
| CN101464486A (en) * | 2009-01-15 | 2009-06-24 | 合肥工业大学 | Method of testing vehicle electric appliance system reliability |
| CN203719860U (en) * | 2014-01-21 | 2014-07-16 | 北京汽车新能源汽车有限公司 | Overall vehicle vibration test system used for electric vehicle |
| CN206339353U (en) * | 2016-11-29 | 2017-07-18 | 北京汽车研究总院有限公司 | A kind of wire harness vibration test hit detection means |
| CN107064665A (en) * | 2016-12-01 | 2017-08-18 | 中国北方车辆研究所 | Electronic product combined stress strenuous test method |
| CN108196145A (en) * | 2017-12-22 | 2018-06-22 | 台州市路桥豪达汽车电器有限公司 | Automobile electric performance test method and system |
| CN108195599A (en) * | 2018-02-12 | 2018-06-22 | 王灿灿 | A kind of automobile vibration experimental rig |
| CN108828362A (en) * | 2018-06-29 | 2018-11-16 | 西南大学 | Wire harness connector RTA reliability test assembly |
| CN208579933U (en) * | 2018-07-18 | 2019-03-05 | 浙江创格科技有限公司 | A kind of durable test device of engine wiring harness |
| CN110704938A (en) * | 2019-07-21 | 2020-01-17 | 南京金龙客车制造有限公司 | Electric commercial vehicle whole vehicle or part endurance test method based on four-column rack |
-
2020
- 2020-12-10 CN CN202011456264.XA patent/CN112697456A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0299217A2 (en) * | 1987-07-16 | 1989-01-18 | Carl Schenck Ag | Vibration testing stand for vehicles, especially for passenger cars |
| CN101464486A (en) * | 2009-01-15 | 2009-06-24 | 合肥工业大学 | Method of testing vehicle electric appliance system reliability |
| CN203719860U (en) * | 2014-01-21 | 2014-07-16 | 北京汽车新能源汽车有限公司 | Overall vehicle vibration test system used for electric vehicle |
| CN206339353U (en) * | 2016-11-29 | 2017-07-18 | 北京汽车研究总院有限公司 | A kind of wire harness vibration test hit detection means |
| CN107064665A (en) * | 2016-12-01 | 2017-08-18 | 中国北方车辆研究所 | Electronic product combined stress strenuous test method |
| CN108196145A (en) * | 2017-12-22 | 2018-06-22 | 台州市路桥豪达汽车电器有限公司 | Automobile electric performance test method and system |
| CN108195599A (en) * | 2018-02-12 | 2018-06-22 | 王灿灿 | A kind of automobile vibration experimental rig |
| CN108828362A (en) * | 2018-06-29 | 2018-11-16 | 西南大学 | Wire harness connector RTA reliability test assembly |
| CN208579933U (en) * | 2018-07-18 | 2019-03-05 | 浙江创格科技有限公司 | A kind of durable test device of engine wiring harness |
| CN110704938A (en) * | 2019-07-21 | 2020-01-17 | 南京金龙客车制造有限公司 | Electric commercial vehicle whole vehicle or part endurance test method based on four-column rack |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115061068A (en) * | 2022-06-06 | 2022-09-16 | 中国第一汽车股份有限公司 | Finished automobile wire harness overload testing and evaluating method |
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Application publication date: 20210423 |