A lane change assist radar factory test method

Abstract

This invention relates to a factory testing method for a lane change assist radar. When the radar is powered on, a low-level reverse gear IO triggers a normal self-test, verifying the output IO function by controlling the synchronous flashing of the left and right warning lights and the sounding of a buzzer. After power-off, the IO level combination is reassembled to perform a progressive special self-test: a high-level reverse gear IO triggers a single buzzer sound to verify the reverse gear input function; a high-level right turn signal triggers the right turn light to illuminate and sound to verify the right turn input; and a high-level left turn signal triggers both lights to illuminate and sound to verify the left turn input. After the special self-test, the radar automatically scans known targets within 10 seconds, capturing the strongest echo point cloud peak value and comparing it with a preset minimum threshold: if the threshold is met, both lights remain constantly on to indicate qualification; otherwise, the buzzer alarm indicates qualification. This invention uses the reverse gear IO as the benchmark to prevent false triggering, eliminating the need for additional equipment to output the test results using the radar's own audio-visual device, thus solving the problems of long testing time, high false detection and missed detection frequency, and difficulty in meeting the needs of mass production in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of autonomous driving technology, and in particular to a factory testing method for lane change assist radar. Background Technology

[0002] With the development of automotive electronics technology, lane change assist radar (Blind Spot Detection, BSD) is widely used in aftermarket applications. To reduce costs and simplify the structure, aftermarket solutions typically adopt a single radar architecture without a control box. This means that a single millimeter-wave radar unit installed in the middle of the rear of the vehicle directly integrates signal processing to achieve all warning functions. The radar only retains the most streamlined interface: three open-drain or push-pull output I / O lines drive the left warning light, right warning light, and buzzer, respectively; and three high- and low-level detection input I / O lines read the level signals of the left turn signal, right turn signal, and reverse light to obtain the status. The MCU then determines the vehicle's current gear and steering intention to achieve environmental perception and warning functions. Therefore, whether these radar I / O functions are normal and whether the radar's detection performance is up to standard are necessary testing steps during factory testing.

[0003] Due to the limited number of interfaces and simple logic, a "discrete manual testing" method has been consistently used. This involves using a programmable I / O fixture to sequentially pull down or raise three output I / O pins, manually verifying whether the warning lights and buzzers function as expected. Then, a 12V high level is applied to each of the three input I / O pins, and diagnostic messages transmitted from the radar are read via serial port or USB adapter to verify the input channels are functioning correctly. Finally, the radar is moved into an anechoic chamber or a simple absorbing box, corner reflectors are placed at a standard distance, and the echo peak value is measured using a vector network analyzer or radar target simulator. The data is then manually recorded and compared with the specifications. The entire process requires various equipment such as IO fixtures, voltage regulators, corner brackets, serial port boxes, anechoic chambers or absorbing walls. Each step requires manual wiring, visual observation, and manual recording. Not only is the hardware investment high, but the separate operation of the three components results in a single unit testing time of over 80 seconds and a total radar testing time of over 3 minutes, which is seriously out of sync with the 30-second / piece speed of the SMT placement line. In addition, the corner placement angle and distance rely entirely on the operator's experience, leading to threshold drift, frequent missed and false detections, and difficulty in parallel operation of radar production lines. Both production capacity and quality consistency have become bottlenecks. Summary of the Invention

[0004] In view of this, the present invention provides a factory testing method for lane change assist radar, which can solve the problems of existing radar factory testing methods that require separate independent testing of input IO, output IO, and radar detectability, which is time-consuming, has a high frequency of false positives and false negatives, and is difficult to meet the needs of mass production. The present invention provides a rapid factory testing method that completes all IO function testing and radar detection performance evaluation within a few power-ups without the need for additional testing equipment, which significantly improves testing efficiency and reduces testing costs.

[0005] To achieve the above object, a method for factory testing a lane change assist radar according to the present invention includes the following steps:

[0006] S1. Power on the radar to be tested, detect the input IO status, and detect the three output IO functions of the left warning light, right warning light, and buzzer of the radar to be tested;

[0007] If the reverse gear IO is at a low level, perform a normal self-check. If the normal self-check is passed, it is determined that the three output IO functions of the left warning light, right warning light, and buzzer of the radar to be tested are normal;

[0008] S2. Power off the radar to be tested, then connect the reverse gear IO to a high level and power on again, perform a special self-check a, and detect the reverse gear IO function of the radar to be tested;

[0009] S3. Power off the radar to be tested again, keep the reverse gear IO connected to a high level and connect the right turn IO to a high level, perform a special self-check b, and detect the right turn IO function of the radar to be tested;

[0010] S4. Power off the radar to be tested again, keep the reverse gear IO and right turn IO connected to a high level and connect the left turn IO to a high level, perform a special self-check c, and detect the left turn IO function of the radar to be tested;

[0011] S5. Detect the detection performance of the radar to be tested;

[0012] After the special self-check c is completed, within 10 seconds, scan the known targets in the preset specific area, find the point cloud with the strongest echo energy. If the peak value exceeds the preset minimum threshold , the left warning light and right warning light will continuously stay on until 10 seconds end, and it is determined that the detection performance of the radar to be tested is qualified; if the peak value of the point cloud with the strongest echo energy never exceeds the preset minimum threshold , the left warning light and right warning light will not light up, and the buzzer will sound for 0.5 seconds, and it is determined that the detection performance of the radar to be tested is unqualified.

[0013] Preferably, for the normal self-check, control the left warning light and right warning light to flash at a frequency of 0.1 second on and 0.1 second off for 2 times. If the buzzer sounds synchronously 2 times, it is determined that the radar to be tested passes the normal self-check.

[0014] Preferably, for the special self-check a, control the buzzer to sound for 0.5 seconds. If both the left warning light and right warning light do not light up, it is determined that the reverse gear IO function of the radar to be tested is normal.

[0015] Preferably, the special self-test b controls the right warning light to illuminate for 0.5 seconds and the buzzer to sound for 0.5 seconds. If the left warning light does not illuminate, it is determined that the right turn IO function of the radar under test is normal.

[0016] Preferably, the special self-test c determines that the left turn IO function of the radar under test is normal by controlling the left and right warning lights to light up simultaneously for 0.5 seconds and the buzzer to sound for 0.5 seconds.

[0017] Preferably, the peak point cloud values ​​generated by N radars with confirmed qualified detection performance at the same location under angular reflection are statistically analyzed, and the peak point cloud value corresponding to the lower limit of the index is set as the minimum threshold. .

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention, through the design of a stepped self-test process and a closed-loop mechanism for automatic judgment of detection performance, can complete the functional verification of all output IOs and input IOs, as well as the integrated factory test of radar detection performance within four power-ups without the need for external testing equipment. This invention utilizes the level characteristics of the vehicle's reverse gear IO as a "special self-test performance" condition. It verifies the output terminal function through ordinary self-tests, then sequentially increments the input IO combinations to perform differentiated special self-tests to verify the input terminal function. Finally, in the final self-test stage, it automatically activates the radar detection performance test, using the integrated lights and buzzers on the radar body to directly provide feedback on the test results. This reduces the original 80-second or more discrete manual testing process to less than 30 seconds, allowing multiple products to be processed in parallel at a single workstation. It completely eliminates the bottlenecks of discrete operation, manual intervention, and equipment dependence in traditional testing, while avoiding the risk of misjudgment caused by manual operation. It significantly improves testing efficiency and quality control consistency in mass production scenarios, providing a standardized testing paradigm for low-cost radars in the aftermarket that can be mass-produced. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the testing process of the present invention. Detailed Implementation

[0021] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0022] This embodiment provides a factory testing method for a lane change assist radar, which can test all functional items of the rapid lane change assist radar without the need for additional equipment.

[0023] The equipment includes: the radar under test (one single radar with a rear-mounted lane change assist radar), and a corner reflector (radar cross-section RCS = 10m).2 The device is located 3m behind the rear of the vehicle at a height of 0.5m, and includes a regulated power supply (13.5V / 10A) and three jumpers (used to pull up the levels of the reverse gear IO, left turn IO, and right turn IO respectively).

[0024] Specifically, the following steps are included:

[0025] S1. With the car in P gear, the radar under test is connected to the regulated power supply and powered on. The input IO status is detected, and the functions of the left warning light, right warning light, and buzzer of the radar under test are detected.

[0026] If the reverse gear IO is at a low level, a normal self-test is performed: the left and right warning lights are controlled to flash twice at a frequency of 0.1 seconds on and 0.1 seconds off. If the buzzer sounds twice in sync, the radar under test is determined to have passed the normal self-test.

[0027] Through a normal self-test, it is determined that the three output I / O functions of the left warning light, right warning light, and buzzer of the radar under test are normal.

[0028] S2. Power off the radar under test, then connect the reverse gear IO to the positive terminal of the regulated power supply via a jumper to a high level and power on again to perform special self-test a to test the reverse gear IO function of the radar under test.

[0029] Special self-test a: If the buzzer sounds for 0.5 seconds and neither the left nor the right warning light illuminates, then the reverse gear IO function of the radar under test is deemed to be normal.

[0030] S3. Power off the radar under test again, keep the reverse gear IO connected to a high level and the right turn IO connected to a high level, execute special self-test b, and test the right turn IO function of the radar under test.

[0031] Special self-test b involves controlling the right warning light to illuminate for 0.5 seconds and the buzzer to sound for 0.5 seconds. If the left warning light does not illuminate, it is determined that the right turn IO function of the radar under test is normal.

[0032] S4. Power off the radar under test again, keep the reverse gear IO and right turn IO connected to high level and the left turn IO connected to high level, execute special self-test c, and test the left turn IO function of the radar under test.

[0033] The special self-test C determines that the left turn IO function of the radar under test is normal by controlling the left and right warning lights to light up simultaneously for 0.5 seconds and the buzzer to sound for 0.5 seconds.

[0034] S5. Perform detection performance testing on the radar under test;

[0035] After the special self-check c is completed, within 10 seconds, scan for known targets (in this embodiment, a corner reflector) within a preset specific area, find the point cloud with the strongest echo energy, and preset the lowest threshold (In this embodiment, the lowest threshold ), if the peak value of the point cloud with the strongest echo energy exceeds the preset lowest threshold , the left warning light and the right warning light will remain on continuously until 10 seconds end, and it is determined that the detection performance of the radar under test is qualified; if the peak value of the point cloud with the strongest echo energy after 10 seconds never exceeds the preset lowest threshold , the left warning light and the right warning light will not light up, and the buzzer will sound for 0.5 seconds, and it is determined that the detection performance of the radar under test is unqualified.

[0036] The lowest threshold is determined through the following steps:

[0037] Select 100 radars whose detection performance has been confirmed to be qualified, count the peak values of the point clouds generated during corner reflection at the same position of the above 100 radars, conduct actual measurements on these 100 radars according to the index requirements during the actual application of the radar, and set the peak value of the point cloud corresponding to the radar with the lower limit of the index as the lowest threshold ;

[0038] In this embodiment, collect the peak values of the corner reflection point clouds from 100 qualified radars, and the distribution is , take the lowest value and then reserve a margin. Therefore, in this embodiment, the lowest threshold .

[0039] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A factory test method for a lane change assist radar, characterized in that, Includes the following steps: S1. Power on the radar under test, check the input IO status, and check the three output IO functions of the radar under test: left warning light, right warning light, and buzzer. S2. Power off the radar under test, then connect the reverse gear IO to a high level and power it back on, execute special self-test a, and test the reverse gear IO function of the radar under test; S3. Power off the radar under test again, keep the reverse gear IO connected to a high level and the right turn IO connected to a high level, execute special self-test b, and test the right turn IO function of the radar under test. S4. Power off the radar under test again, keep the reverse gear IO and right turn IO connected to high level and the left turn IO connected to high level, execute special self-test c, and test the left turn IO function of the radar under test. S5. Perform detection performance testing on the radar under test.

2. The factory testing method for a lane change assist radar according to claim 1, characterized in that, If the reverse gear IO is at a low level, a normal self-test is performed. If the normal self-test is passed, it is determined that the three output IOs of the radar under test, namely the left warning light, the right warning light, and the buzzer, are functioning normally. The normal self-test is performed by controlling the left and right warning lights to flash twice at a frequency of 0.1 seconds on and 0.1 seconds off. If the buzzer sounds twice in sync, it is determined that the radar under test has passed the normal self-test.

3. The factory testing method for a lane change assist radar according to claim 1, characterized in that, The special self-test a controls the buzzer to sound for 0.5 seconds. If neither the left nor the right warning light illuminates, then the reverse gear IO function of the radar under test is determined to be normal.

4. The factory testing method for a lane change assist radar according to claim 1, characterized in that, The special self-test b controls the right warning light to illuminate for 0.5 seconds and the buzzer to sound for 0.5 seconds. If the left warning light does not illuminate, it is determined that the right turn IO function of the radar under test is normal.

5. The factory testing method for a lane change assist radar according to claim 1, characterized in that, The special self-test C determines that the left turn IO function of the radar under test is normal by controlling the left and right warning lights to light up simultaneously for 0.5 seconds and the buzzer to sound for 0.5 seconds.

6. The factory testing method for a lane change assist radar according to claim 1, characterized in that, After the special self-check c is completed, within 10 seconds, scan the known targets within the preset specific area to find the point cloud with the strongest echo energy. If the peak value of the point cloud with the strongest echo energy exceeds the preset minimum threshold , the left warning light and the right warning light will continuously stay on until the end of 10 seconds, and it is determined that the detection performance of the radar under test is qualified; if the peak value of the point cloud with the strongest echo energy after 10 seconds never exceeds the preset minimum threshold , the left warning light and the right warning light will not light up, and the buzzer will sound for 0.5 seconds, and it is determined that the detection performance of the radar under test is unqualified.

7. The factory testing method for a lane change assist radar according to claim 6, characterized in that, The peak point cloud values ​​generated by N radars with confirmed detection performance at the same location under angular reflection are statistically analyzed, and the peak point cloud value corresponding to the lower limit of the index is set as the minimum threshold. .

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