Vehicle-mounted ultrasonic blind area detection method

Abstract

The invention provides a vehicle-mounted ultrasonic blind area detection system. The vehicle-mounted ultrasonic blind area detection system comprises a sensor module, a processing module and a buzzer alarm module, the sensor module is used for controlling a sensor to carry out wave sending detection; and the processing module is used for processing the echo signal and setting a flag bit, judging whether the echo is normal or not, and inputting a judgment result into the buzzer alarm module to carry out alarm operation. According to the vehicle-mounted ultrasonic blind area detection system provided by the invention, the alarm processing of an obstacle in a blind area is improved by setting a flag bit and anti-shake and anti-misoperation, so that the possibility of misjudgment of the system is reduced, the alarm accuracy is improved, and the use trouble of a user is reduced.

Description

Technical Field

[0001] The invention relates to a vehicle-mounted ultrasonic blind spot detection method. Background Art

[0002] At present, ultrasonic detection is widely used, and users are accustomed to operating according to the detection results of the sensor. However, the sensor has blind spots within a certain range, especially an area very close to the vehicle bumper. The range of 0.2 meters is the blind spot of the sensor. Since it cannot stably identify obstacles, it will cause the vehicle to alarm irregularly in this area and frequently misjudge obstacles.

[0003] Since it targets the blind spot of the sensor, the traditional system will identify the area of ​​obstacles. In the first area, which is the area closest to the vehicle, irregular jumps will occur between the three states of leaving the nearest area and having no obstacles, forming an unstable alarm, which greatly affects the user's operating comfort and safety. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for vehicle-mounted ultrasonic blind spot detection, set a mark position, distinguish the characteristics of obstacles and entering the blind spot, so that the sensor can enhance the process of identifying obstacles and entering the blind spot, reduce the alarm of the alarm without reason, and improve the detection accuracy.

[0005] In traditional blind spot detection, a frequency-scrambling phenomenon will occur in the area close to the sensor. That is, during the ultrasonic short-range detection process, there will be a section of waveform that is a frequency-scrambling waveform. If the obstacle gets closer and closer to the sensor until it enters the blind spot, its reflected echo will be incorporated into the frequency-scrambling waveform, causing the frequency-scrambling signal to expand. Therefore, it is possible to determine whether the obstacle has entered the detection blind spot based on whether the frequency-scrambling waveform of the detection echo has expanded.

[0006] like Figure 4 As shown, Figure 4 The above figure shows the detection echo and frequency waveform under normal conditions. Figure 4 The figure below shows the state where the echo amplifies the upside-down waveform after an obstacle enters the blind spot.

[0007] In order to solve the above technical problems, the technical solution of the present invention is: A vehicle-mounted ultrasonic blind spot detection system comprises a sensor module, a processing module and a buzzer alarm module; the sensor module is used to control the sensor to perform wave detection; the processing module is used to process the echo signal, determine whether the echo is normal and set a flag, and input the determination result to the buzzer alarm module to perform an alarm operation; This system divides the distance behind the vehicle into multiple alarm areas, and the area closest to the rear of the vehicle is the first alarm area; The system execution process is as follows: In the first step, the sensor performs wave detection and sends it to the processing module for echo processing to determine whether the echo frequency fluctuation phenomenon increases. If it does not increase, it will directly proceed to the third step. If it increases, it will proceed to the second step. The second step is to set the flag and then go to the third step; The third step is to confirm the obstacle distance according to the echo processing, and determine whether the obstacle distance belongs to the first alarm area. If it belongs to the first alarm area, the determination result is provided to the buzzer alarm module and the process directly proceeds to the twelfth step; if it does not belong to the first alarm area, the process proceeds to the fourth step; The fourth step is to determine whether the obstacle distance belongs to other alarm areas. If it is determined to be yes, then go to the fifth step; if it is determined to be no, then go to the eleventh step; Step 5: Determine whether there is a set flag bit. If it is, go to step 6; if it is not, go to step 8; The sixth step is to detect whether the obstacle distance value is not greater than the standard value. If it is determined to be yes, the obstacle is determined to be the first alarm area, and the determination result is provided to the buzzer alarm module, and then the twelfth step is entered; if it is determined to be no, the seventh step is entered; Step 7: determine the alarm area of ​​the obstacle according to the distance value of the obstacle, provide the determination result to the buzzer alarm module, cancel the setting of the flag bit, and then enter step 12; Step 8: determine whether the obstacle warning area determined in the previous round is the first warning area. If it is determined to be yes, proceed to step 9; if it is determined to be no, proceed to step 10; Step 9, determining that the obstacle is in the first alarm area and maintaining the determination result for a first fixed alarm time, and providing the determination result to the buzzer alarm module, and then proceeding to step 12; Step 10, determining the alarm area of ​​the obstacle according to the distance value of the obstacle, and providing the determination result to the buzzer alarm module, and then proceeding to step 12; In the eleventh step, it is determined that the obstacle alarm area is the same as the obstacle alarm area determined in the previous round, and the determination result is maintained as the second fixed alarm time, and the setting of the flag is cancelled, and then the determination result is provided to the buzzer alarm module, and then the twelfth step is entered; Step 12: determine whether the alarm area determined by the processing module is closer to the vehicle than the existing alarm area of ​​the buzzer alarm module. If it is, proceed to step 13; if it is not, return to step 1. In the thirteenth step, the buzzer alarm module sounds a buzzer alarm according to the nearest alarm area.

[0008] Further, in the sixth step, the standard value is set to 55 cm.

[0009] Furthermore, the first fixed alarm time is 1.5 seconds.

[0010] Furthermore, the second fixed alarm time is 1.5 seconds.

[0011] Furthermore, the second fixed alarm time is equal to the first fixed alarm time.

[0012] Furthermore, the second fixed alarm time is not equal to the first fixed alarm time.

[0013] Furthermore, whether to set a flag is determined by whether the jitter phenomenon of the sensor increases. If the jitter phenomenon increases, the flag is set; if the jitter phenomenon does not increase, the flag is not set.

[0014] Compared with the prior art, the vehicle-mounted ultrasonic blind spot detection system provided by the present invention improves the alarm processing of obstacles in the blind spot by setting marks and anti-shake and anti-misoperation, reduces the possibility of system misjudgment, improves alarm accuracy, and reduces user troubles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 A system structure diagram of the invention is shown.

[0016] Attached Figure 2 A system flow chart of the present invention is shown.

[0017] Attached Figure 3 A schematic diagram of the alarm area of ​​the present invention is shown.

[0018] Attached Figure 4 The relationship between the detection echo and the frequency fluctuation waveform in the prior art is shown. DETAILED DESCRIPTION

[0019] In one embodiment, Figure 1 As shown, a vehicle-mounted ultrasonic blind spot detection system includes a sensor module, a processing module and a buzzer alarm module; the sensor module is used to control the sensor to perform wave detection; the processing module is used to process the echo signal, determine whether the echo is normal and set a flag, and input the determination result to the buzzer alarm module to perform an alarm operation; like Figure 3 As shown, in one embodiment, the system divides the distance behind the vehicle into multiple warning areas, and the section closest to the rear of the vehicle is the first warning area; like Figure 2 As shown, in one embodiment, the system performs the following process: In the first step, the sensor performs wave detection and sends it to the processing module for echo processing to determine whether the echo frequency fluctuation phenomenon increases. If it does not increase, it will directly proceed to the third step. If it increases, it will proceed to the second step. The second step is to set the flag and then go to the third step; The third step is to confirm the obstacle distance according to the echo processing, and determine whether the obstacle distance belongs to the first alarm area. If it belongs to the first alarm area, the determination result is provided to the buzzer alarm module and the process directly proceeds to the twelfth step; if it does not belong to the first alarm area, the process proceeds to the fourth step; The fourth step is to determine whether the obstacle distance belongs to other alarm areas. If it is determined to be yes, then go to the fifth step; if it is determined to be no, then go to the eleventh step; Step 5: Determine whether there is a set flag bit. If it is, go to step 6; if it is not, go to step 8; The sixth step is to detect whether the obstacle distance value is not greater than the standard value. If it is determined to be yes, the obstacle is determined to be the first alarm area, and the determination result is provided to the buzzer alarm module, and then the twelfth step is entered; if it is determined to be no, the seventh step is entered; Step 7: determine the alarm area of ​​the obstacle according to the distance value of the obstacle, provide the determination result to the buzzer alarm module, cancel the setting of the flag bit, and then enter step 12; Step 8: determine whether the obstacle warning area determined in the previous round is the first warning area. If it is determined to be yes, proceed to step 9; if it is determined to be no, proceed to step 10; Step 9, determining that the obstacle is in the first alarm area and maintaining the determination result for a first fixed alarm time, and providing the determination result to the buzzer alarm module, and then proceeding to step 12; Step 10, determining the alarm area of ​​the obstacle according to the distance value of the obstacle, and providing the determination result to the buzzer alarm module, and then proceeding to step 12; In the eleventh step, it is determined that the obstacle alarm area is the same as the obstacle alarm area determined in the previous round, and the determination result is maintained as the second fixed alarm time, and the setting of the flag is cancelled, and then the determination result is provided to the buzzer alarm module, and then the twelfth step is entered; Step 12: determine whether the alarm area determined by the processing module is closer to the vehicle than the existing alarm area of ​​the buzzer alarm module. If it is, proceed to step 13; if it is not, return to step 1. In the thirteenth step, the buzzer alarm module sounds a buzzer alarm according to the nearest alarm area.

[0020] In one embodiment, in the sixth step, the standard value is set to 55 centimeters; when a flag is set and the obstacle distance value is not greater than 55 centimeters, in order to avoid misjudgment by the processing module, it is directly determined as the first alarm area; the frequency fluctuation phenomenon of the sensor echo is used to determine whether there is an obstacle entering the blind spot. When the frequency fluctuation area increases, it is determined that an obstacle has entered the blind spot. At this time, a flag is set to mark the situation where an obstacle has entered the blind spot.

[0021] In another embodiment, in step 9, the first fixed alarm time may be 1.5 seconds; and in step 11, the second fixed alarm time may be 1.5 seconds. The first fixed alarm time and the second fixed alarm time do not have to be the same, and may be different.

[0022] In the final judgment, if the result of the echo signal processing is that there is no obstacle, the alarm area of ​​the previous round of judgment will be maintained for 1.5 seconds, and then the next round of detection will begin. Similarly, the time for maintaining judgment can also be adjusted according to the situation.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than a limiting technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A vehicle-mounted ultrasonic blind spot detection system, characterized in that: It includes a sensor module, a processing module and a buzzer alarm module; the sensor module is used to control the sensor to perform wave detection; the processing module is used to process the echo signal, determine whether the echo is normal and set the flag, and input the determination result to the buzzer alarm module to perform an alarm operation; This system divides the distance behind the vehicle into multiple alarm areas, and the area closest to the rear of the vehicle is the first alarm area; The system execution process is as follows: In the first step, the sensor performs wave detection and sends it to the processing module for echo processing to determine whether the echo frequency fluctuation phenomenon increases. If it does not increase, it will directly proceed to the third step. If it increases, it will proceed to the second step. The second step is to set the flag and then go to the third step; The third step is to confirm the obstacle distance according to the echo processing, and determine whether the obstacle distance belongs to the first alarm area. If it belongs to the first alarm area, the determination result is provided to the buzzer alarm module and the process directly proceeds to the twelfth step; if it does not belong to the first alarm area, the process proceeds to the fourth step; The fourth step is to determine whether the obstacle distance belongs to other alarm areas. If it is determined to be yes, then go to the fifth step; if it is determined to be no, then go to the eleventh step; Step 5: Determine whether there is a set flag bit. If it is, go to step 6; if it is not, go to step 8; Step 6: Detect whether the obstacle distance value is not greater than the standard value. If it is, determine that the obstacle is the first alarm area, and provide the determination result to the buzzer alarm module, and then enter step 12; If the judgment is no, go to step 7; Step 7: determine the alarm area of ​​the obstacle according to the distance value of the obstacle, provide the determination result to the buzzer alarm module, cancel the setting of the flag, and then enter step 12; Step 8: determine whether the obstacle warning area determined in the previous round is the first warning area. If it is determined to be yes, proceed to step 9; if it is determined to be no, proceed to step 10; Step 9, determining that the obstacle is in the first alarm area and maintaining the determination result for a first fixed alarm time, and providing the determination result to the buzzer alarm module, and then proceeding to step 12; Step 10, determining the alarm area of ​​the obstacle according to the distance value of the obstacle, and providing the determination result to the buzzer alarm module, and then proceeding to step 12; In the eleventh step, it is determined that the obstacle alarm area is the same as the obstacle alarm area determined in the previous round, and the determination result is maintained as the second fixed alarm time, and the setting of the flag is cancelled, and then the determination result is provided to the buzzer alarm module, and then the twelfth step is entered; Step 12: determine whether the alarm area determined by the processing module is closer to the vehicle than the existing alarm area of ​​the buzzer alarm module. If so, proceed to step 13; If the judgment is no, go back to the first step; In the thirteenth step, the buzzer alarm module sounds a buzzer alarm according to the nearest alarm area.

2. The vehicle-mounted ultrasonic blind spot detection system according to claim 1, characterized in that: In step 6, the standard value is set to 55 cm.

3. The vehicle-mounted ultrasonic blind spot detection system according to claim 1, characterized in that: The first fixed alarm time is 1.5 seconds.

4. The vehicle-mounted ultrasonic blind spot detection system according to claim 1, characterized in that: The second fixed alarm time is equal to the first fixed alarm time.

5. The vehicle-mounted ultrasonic blind spot detection system according to claim 1, characterized in that: The first fixed alarm time is not equal to the second fixed alarm time.

6. The vehicle-mounted ultrasonic blind spot detection system according to claim 1, characterized in that: In the second step, the jitter phenomenon of the sensor echo is used to determine whether there is an obstacle entering the blind spot. When the jitter area increases, it is determined that an obstacle has entered the blind spot. At this time, a flag is set to mark the situation where an obstacle has entered the blind spot.

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