Automobile Inspection Technology

Chapter 35 Vehicle Inspection Technology (11)
②Connect the power supply and various cables correctly.The headlight tester needs to move between the headlights during detection, so the cable should have sufficient length and appropriate protective measures.

③ Before using the instrument, check whether the zero position of each indicator drifts, whether the light receiving surface of the light receiver is dusty or polluted, and the tracking performance of the tracking optical axis detector should be periodically calibrated.

④ Avoid the influence of external light.For vehicles with four-lamp system, one of the two headlamps on the same side should be covered during inspection, and then the other should be inspected.

⑤ Formulate corresponding operating procedures according to the requirements of the manual of the detector used, and operate the detector correctly.

(No.11) Brief introduction of body electronic detection technology

In recent years, the number of cars has increased rapidly, and a large number of frequent traffic accidents have led to a sharp increase in the demand for accident car repairs.

add.How to ensure that car owners are provided with fast and high-quality accident vehicle repair services after traffic accidents occur, and how to ensure that the repaired vehicles are safely put on the road again has become a problem of great concern to the majority of car owners and the society.Since accident vehicle repair is a comprehensive problem with strong technical expertise and many fields involved, how to make the repaired accident vehicle body reach the technical performance index at the time of delivery is a question for repair shops, 4S shops and various An important problem facing professional automotive schools.

In fact, in the process of automobile manufacturing, there are many important measurement benchmarks.These benchmarks are not only the benchmarks of automobile manufacturing, but also the process benchmarks and measurement benchmarks of body repair.If these original manufacturing benchmarks can be used as the measurement benchmarks during and after the repair of the car body, and the size standard of the factory can be achieved through measurement during the car body repair, then the car body repair will have a qualitative leap.

Here, taking the SPANESK DING OUCH body chassis measurement system as an example (Fig. 5-76), briefly introduce its composition principle, detection function and its application in automobile maintenance.

1. The composition and basic principle of the TOUCH body chassis measurement system
(1) Hardware configuration
①Integral arm measuring ruler.

②Measure the extended arm ruler.

③ Measuring head.

④ PC (portable notebook computer).

⑤Printer (high-definition color).

⑥Removable and fixed cabinets.

⑦ Wireless Bluetooth transmission device.

⑧ Follow-up stretching and fixing device.

(2) Software configuration
① Advanced design, easy to operate, no need to calibrate the center line of the vehicle, with independent measurement and comparative analysis capabilities, and the screen displays the location pictures of the measured points.

②It has a powerful documentation function, and can send the detection data and pictures of the damaged vehicle to the damage assessment system and other PCs by email.

(3) Basic principles
Using flexible measurement technology, select the appropriate measuring point on the surface of the tested car and parts, use the free measuring head of the instrument to align the measuring point for measurement, and input the data into the computer, which is consistent with the standard shape of the car or part stored in the computer Size comparison can display the test results.

2. The basic functions of the body electronic measurement system TOUCH

① Measurement of three-dimensional coordinates of points in any space.

② Detection of the linear distance between two points in space.

③ Detection of the angle between two lines in space.

④ Detection of the angle between two planes in space.

⑤It can work normally under power supply or battery power.

⑥ All test items can produce color chart reports and data transmission through network connection.

⑦ It can store the customer's maintenance and testing data, which is convenient for comparison before and after maintenance.

⑧ It can accurately measure the three-dimensional data of each point of the chassis body, and automatically compare it with the original body data to clarify the error.

⑨It can diagnose and measure mechanical parts, such as Yuanbao beam, shock absorber, wheel hub, swing arm, etc.

⑩Use the Bluetooth function to transmit data, and the computer and the measuring arm can be separated.
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The four-wheel alignment test can be performed when the vehicle is parked on flat ground.

3. Application of body electronic measurement system in maintenance

(1) Body deformation and repair detection and four-wheel alignment detection

① Use the measuring arm to measure the corresponding measuring points of the car body, obtain the data and input it into the computer, and compare it with the standard data of the vehicle to detect the deformation of the car body.Figure 5-76 and Figure 5-77 show the shape detection of the upper part and the bottom of the car body respectively.

② The vehicle is parked on the flat ground for four-wheel alignment detection. The instrument enters the four-wheel alignment detection system and randomly selects three points on the wheel rim to measure, and then the installation position data of the wheel on the vehicle can be obtained, as shown in Figure 5- 78.

The repairman can clearly know the deformation of the measuring point, provide the repair basis for the repairman, and greatly improve the accuracy of the repair of the accident vehicle.More importantly, the electronic measurement system can measure the entire accident vehicle in a coordinate system, changing the traditional method of only partially measuring the vehicle, thereby avoiding the measurement error of the entire vehicle.

(2) Detection of damaged parts

During repair work, damaged parts often need to be replaced.In some cases, it is impossible and dare not to determine which parts must be replaced and which parts can continue to be used, so they are replaced together for safety, which often causes unnecessary waste and trouble.The accessories can be easily inspected by using the body electronic measurement system, as shown in Figure 5-82, to determine whether the accessories are damaged or have exceeded the limit of use, so as to decide whether to replace them.Improved economics of the repair shop

③ During the body repair process, the body electronic measurement system participates in the tension repair work of the calibrator, as shown in Figure 5-79, and provides sheet metal workers with accurate data measurement of each point of the chassis body, and automatically compares it with the factory data as shown in the figure 5-80, as shown in Figure 5-81, to ensure that the body data of the repaired accident car is consistent with that at the factory, improve the accuracy of body repair, and avoid relying on the repair experience of sheet metal workers in the repair process of the accident car, making it scientific to rationalize.Thereby improving the maintenance precision of the accident vehicle, reducing the difficulty of repairing the accident vehicle, and making the whole repair process become evidence-based.

Figure 5-79 Synchronously detect benefits when using the calibrator for body tension repair, reducing unnecessary waste.

4. Advantages of body electronic measurement system

①It can be equipped on any girder corrector, or it can be used alone as a measuring instrument. It can be tested with a two-column lift or on the ground.

② Measuring holes or points in space is very simple.To measure the center point of a hole, just use the measuring head to measure any three points on the circumference of the hole, and the measuring instrument can calculate the coordinates of the center point of the hole.

③It is very convenient to move and is not limited by the location of the workshop.It can be used in sheet metal workshops to repair accident vehicles, and can also be used in inspection stations, and can also be used in business reception stations for business inspection and analysis of faulty damaged parts.

(No.12) Automobile inspection training

[Training project [-]] Internship at the testing station
1. Training content
①Visit the vehicle inspection station.

②Learn the standards and regulations related to automobile inspection.

③ Understand the types and functions of vehicle inspection stations.

2. Purpose of training
①Understand the types of automobile testing stations, process layout, station layout and equipment configuration of testing lines.

②Understand the inspection content and inspection process of the automobile inspection station.

③ Understand the job responsibilities of vehicle inspectors.

④ Master the relevant standards and regulations of automobile inspection.

[Training project [-]] Detection of vehicle emissions

([-]) Detection of pollutants emitted by gasoline engines

1. Training content
① Know the structure and usage of gasoline engine exhaust gas analyzer.

② Carry out the detection of pollutants emitted by gasoline engines.

③ Determine the test results and analyze the possible reasons for excessive discharge.

2. Purpose of training
① Understand the main components and hazards of pollutants emitted by gasoline vehicles.

② Familiar with the detection principle, structure and use method of gasoline engine exhaust gas analyzer.

③ Master the detection methods and standards of pollutants emitted by gasoline engines.

④ Be able to analyze the possible reasons for excessive discharge.

3. Equipment, tools and materials
①A set of non-spectral infrared analyzer.

② The venue is suitable, and one vehicle to be tested.

③Standard gas sample and suitable power supply.

4. Operation steps
Refer to (Section VII) Standards and Testing of Exhaust Pollutants from Gasoline Vehicles.

([-]) Detection of diesel engine smoke

1. Training content
① Know the structure and usage of diesel smoke meter.

② Carry out diesel engine smoke detection.

③ Determine the test results and analyze the possible reasons for excessive discharge.

2. Purpose of training
① Understand the main components and hazards of pollutants emitted by diesel engines.

②Familiar with the testing principle, structure and usage of diesel smoke meter.

③Master the methods and standards of diesel engine smoke detection.

④ Be able to analyze the possible reasons for excessive discharge.

3. Equipment, tools and materials
①A set of filter paper smoke meter.

② The venue is suitable, and one vehicle to be tested.

③Appropriate power supply.

4. Operation steps
Refer to (section [-]) the detection method of free acceleration smoke of diesel vehicles.

【Training project [-]】Detection of car noise

1. Training content
① Know the structure of the sound level meter.

② Correctly use the instrument for vehicle noise detection.

③Determine the test result.

2. Purpose of training
① Familiar with the structure, operation method and maintenance of the sound level meter.

②Master the vehicle noise detection method.

③Master the vehicle noise testing standards.

3. Equipment, tools and materials
① A precision sound level meter and a common sound level meter.

② The site is suitable and the testing environment meets the requirements.

③ One vehicle under test.

4. Operation steps
Refer to (section [-]) the detection method of vehicle noise.

[Training project [-]] Detection of headlights

1. Training content
① Correctly use the headlight tester to detect the luminous intensity and beam irradiation position of the car headlights.

②Correctly judge and analyze the test results.

③ Adjust the headlights whose test results do not meet the requirements.

2. Purpose of training
① Familiar with the structure and working principle of the automobile headlight tester.

② Master the testing content and testing standards of automobile headlights.

③ Master the detection method of automobile headlights.

④ Master the adjustment method of automobile headlights.

3. Equipment, tools and materials
① A set of headlight tester.

② The site is flat and suitable in size, and there is one vehicle to be tested.

③Appropriate power supply and several adjustment tools.

4. Operation steps
Refer to (Section [-]) testing standards and testing methods for automobile headlights.

thinking and practice
1. What are the types of vehicle testing stations?What are the basic inspection functions?
2. What are the evaluation indicators of automobile function?How to detect?
3. What are the evaluation indicators of automobile economy?How to detect?
4. Briefly describe the inspection standards and detection methods of vehicle sideslip.

5. What are the contents of the vehicle brake performance bench test?How to detect?
6. What are the contents of the vehicle braking performance road test?How to detect?
7. What are the testing methods for gasoline vehicle exhaust pollution?How is its detection method?
8. How about the measurement method of diesel vehicle exhaust smoke?
9. Briefly describe the main items and testing methods of automobile steering performance testing.

10. What are the vehicle noise testing items?How to detect?
11. Describe the type, structure and detection principle of automobile headlight detection.

12. What are the inspection items for automobile headlights?How to use the instrument to detect headlights?

13. Briefly describe the speedometer detection method.

14. Briefly describe the significance of body electronic detection technology in automobile maintenance.

(End of this chapter)