Detection system and method for a vehicle-mounted ultrasonic blind zone

Abstract

A vehicle-mounted ultrasonic blind spot detection system includes a sensor module, a processing module, and a buzzer alarm module. The sensor module controls the sensor to emit waves for detection. The processing module processes the echo signal, sets a flag, determines whether the echo is normal, and inputs the determination result to the buzzer alarm module to trigger an alarm. This invention provides a vehicle-mounted ultrasonic blind spot detection system that improves the alarm processing for obstacles in blind spots by setting flags and implementing anti-shake and anti-misoperation measures. This reduces the possibility of system misjudgment, improves alarm accuracy, and reduces user inconvenience.

Description

Technical Field

[0001] This invention relates to an ultrasonic blind spot detection method, and more particularly to a vehicle-mounted ultrasonic blind spot detection system. Prior Technology

[0002] Currently, ultrasonic detection is widely used, and users are accustomed to operating based on the sensor's detection results. However, sensors have blind spots within a certain range, especially in an area very close to the vehicle's bumper. For example, the blind spot is within 0.2 meters. Because it cannot reliably identify obstacles, the vehicle will issue irregular alarms in this area, frequently misjudging obstacles.

[0003] Because it targets the blind spots of sensors, traditional systems identify areas with obstacles, especially the area closest to the vehicle. However, the system will produce irregular jumps between the three states of leaving the nearest area and no obstacles, resulting in unstable alarms and greatly affecting 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 system and method for vehicle-mounted ultrasonic blind spot detection, which sets the location of markers, distinguishes the characteristics of obstacles and entry into blind spots, so that the sensor can enhance the identification of obstacles and entry into blind spots, reduce the alarms that are triggered without reason, and improve the detection accuracy.

[0005] In traditional blind spot detection, a frequency oscillation phenomenon occurs near the sensor. During close-range ultrasonic detection, a segment of the waveform exhibits a oscillation. As an obstacle gets closer to the sensor and enters the blind spot, its reflected echo merges with the oscillation waveform, amplifying the oscillation signal. Therefore, the amplification of the oscillation waveform in the detection echo can be used to determine whether an obstacle has entered the detection blind spot. "Obscillation" refers to the emitted vibration of an onboard ultrasonic blind spot detection system (i.e., an ultrasonic reversing radar system) and its residual vibration after emission.

[0006] As shown in Figures 4a and 4b, Figure 4a shows the state of the detection echo and dynamometer waveform under normal conditions, while Figure 4b shows the state of the echo and dynamometer waveform after an obstacle enters the blind zone.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is:

[0008] A vehicle-mounted ultrasonic blind spot detection system includes a sensor module, a processing module, and a buzzer alarm module. The sensor module controls the sensor to emit waves for detection. The processing module processes the echo signal, determines whether the echo is normal, sets a flag, and inputs the determination result to the buzzer alarm module to trigger an alarm.

[0009] This vehicle-mounted ultrasonic blind spot detection system divides the distance behind the vehicle into multiple alarm zones, with the zone closest to the rear of the vehicle being the first alarm zone.

[0010] The execution process of this vehicle-mounted ultrasonic blind spot detection system includes the following steps:

[0011] The first step involves the sensor detecting emitted waves and then processing the echoes to determine if the echo frequency distortion has increased. If not, the process proceeds directly to the third step; if it has increased, the process proceeds to the second step.

[0012] The second step is to set the flag, and then proceed to the third step;

[0013] The third step involves confirming the obstacle distance based on echo processing and determining whether the obstacle distance falls within the first alarm zone. If it does, the determination result is provided to the buzzer alarm module, and the process proceeds directly to the twelfth step. If it does not fall within the first alarm zone, the process proceeds to the fourth step.

[0014] The fourth step is to determine whether the distance to the obstacle falls within another alarm zone. If the determination is yes, proceed to the fifth step; if the determination is no, proceed to the eleventh step.

[0015] Fifth step: Determine if a flag is set. If yes, proceed to sixth step; if no, proceed to eighth step.

[0016] Step 6: Detect whether the distance to the obstacle is not greater than the standard value. If the determination is yes, the obstacle is identified as the first alarm zone, and the determination result is provided to the buzzer alarm module. Then proceed to step 12; if the determination is no, proceed to step 7.

[0017] Step 7: Determine the alarm zone of the obstacle based on the distance value of the obstacle, provide the determination result to the buzzer alarm module, cancel the setting of the flag bit, and then proceed to step 12;

[0018] Step 8: Determine if the obstacle alarm area identified in the previous round is the first alarm area. If yes, proceed to step 9; if no, proceed to step 10.

[0019] Step 9: Determine that the obstacle is in the first alarm zone and maintain this determination for a first fixed alarm time, and provide the determination result to the buzzer alarm module, then proceed to step 12;

[0020] Step 10: Determine the alarm zone of the obstacle based on the distance value of the obstacle, and provide the determination result to the buzzer alarm module, then proceed to step 12;

[0021] Step 11: Determine that the obstacle alarm area is the same as the obstacle alarm area determined in the previous round, maintain this determination result for the second fixed alarm time, and cancel the setting of the flag bit. Then, provide the determination result to the buzzer alarm module, and then proceed to step 12.

[0022] Step 12: Determine if the alarm area determined by the processing module is closer to the vehicle than the existing alarm area of ​​the buzzer alarm module. If yes, proceed to step 13; if no, return to step 1.

[0023] Step 13: The buzzer alarm module sounds an alarm based on the nearest alarm area.

[0024] Furthermore, in step six, the standard value is set at 55 cm.

[0025] Furthermore, the first fixed alarm time is 1.5 seconds.

[0026] Furthermore, the second fixed alarm time is 1.5 seconds.

[0027] Furthermore, the second fixed alarm time is equal to the first fixed alarm time.

[0028] Furthermore, the second fixed alarm time is not equal to the first fixed alarm time.

[0029] Furthermore, the system determines whether to set a flag by checking whether the frequency oscillation of the sensor increases. If the frequency oscillation increases, the flag will be set; if the frequency oscillation does not increase, the flag will not be set.

[0030] The vehicle-mounted ultrasonic blind spot detection method of the present invention includes the following steps:

[0031] A vehicle-mounted ultrasonic blind spot detection system is provided, comprising a sensor module, a processing module, and a buzzer alarm module. The sensor module controls a sensor to emit waves for detection. The processing module processes the echo signal, determines whether the echo is normal, sets a flag, and inputs the determination result to the buzzer alarm module to trigger an alarm. The vehicle-mounted ultrasonic blind spot detection system divides the distance behind the vehicle into multiple alarm zones, with the zone closest to the rear of the vehicle being the first alarm zone.

[0032] The first step involves the sensor detecting emitted waves, which are then processed by the processing module to determine if the echo frequency distortion has increased. If not, the process proceeds directly to the third step; if it has increased, the process proceeds to the second step.

[0033] The second step is to set the flag, and then proceed to the third step;

[0034] The third step involves confirming the distance to an obstacle based on echo processing, determining whether the distance to the obstacle falls within the first alarm zone. If it does, the determination result is provided to the buzzer alarm module, and the process proceeds directly to the twelfth step. If it does not fall within the first alarm zone, the process proceeds to the fourth step.

[0035] The fourth step is to determine whether the distance to the obstacle falls within another alarm zone. If the determination is yes, proceed to the fifth step; if the determination is no, proceed to the eleventh step.

[0036] Fifth step: Determine if a flag is set. If yes, proceed to sixth step; if no, proceed to eighth step.

[0037] Step 6: Detect whether the distance to the obstacle is not greater than the standard value. If it is, determine that the obstacle is in the first alarm zone and provide the determination result to the buzzer alarm module, then proceed to step 12; if it is not, proceed to step 7.

[0038] Step 7: Determine the alarm zone of the obstacle based on its distance value, provide the determination result to the buzzer alarm module, cancel the flag setting, and then proceed to step 12;

[0039] Step 8: Determine whether the obstacle alarm area identified in the previous round is the first alarm area. If yes, proceed to step 9; if no, proceed to step 10.

[0040] Step 9: Determine that the obstacle is within the first alarm zone and maintain this determination for a first fixed alarm time, then provide the determination result to the buzzer alarm module, and proceed to step 12;

[0041] Step 10: Determine the alarm zone of the obstacle based on its distance value, and provide the determination result to the buzzer alarm module, then proceed to step 12;

[0042] Step 11: Determine that the obstacle alarm area is the same as the obstacle alarm area determined in the previous round, maintain this determination result for the second fixed alarm time, and cancel the setting of the flag bit. Then, provide the determination result to the buzzer alarm module, and then proceed to step 12;

[0043] 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 yes, proceed to step 13; if no, return to step 1.

[0044] Step 13: The buzzer alarm module sounds an alarm based on the nearest alarm area.

[0045] Compared with existing technologies, the vehicle-mounted ultrasonic blind spot detection system provided by this invention improves the alarm processing of obstacles in blind spots by setting marker positions and anti-shake and anti-misoperation measures, reduces the possibility of system misjudgment, improves alarm accuracy, and reduces user annoyance. Simple Explanation of the Diagram

[0046] Figure 1 shows a structural diagram of the vehicle-mounted ultrasonic blind spot detection system of the present invention. Figures 2a-2c show the execution flowchart of the vehicle-mounted ultrasonic blind spot detection system of the present invention. Figure 3 shows a schematic diagram of the alarm area of ​​the present invention. Figures 4a and 4b show the relationship between the detection echo and frequency oscillation waveforms of the prior art and the present invention. Implementation

[0047] To make the above-mentioned objectives, features and characteristics of the present invention more apparent and understandable, the relevant embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] In one embodiment, as shown in Figure 1, 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 emit waves for 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.

[0049] As shown in Figure 3, in one embodiment, the vehicle-mounted ultrasonic blind spot detection system divides the distance behind the vehicle into multiple alarm zones, with the zone closest to the rear of the vehicle being the first alarm zone.

[0050] Figures 2a-2c show the execution flowchart of the vehicle-mounted ultrasonic blind spot detection system of the present invention. As shown in Figures 2a-2c, in one embodiment, the execution flow of the vehicle-mounted ultrasonic blind spot detection system includes the following steps:

[0051] The first step involves the sensor detecting the emitted waves and then processing the echoes to determine if the echo frequency distortion has increased. If not, the process proceeds directly to the third step; otherwise, it proceeds to the second step.

[0052] The second step is to set the flag, and then proceed to the third step;

[0053] The third step involves confirming the obstacle distance based on echo processing and determining whether the obstacle distance falls within the first alarm zone. If it does, the determination result is provided to the buzzer alarm module, and the process proceeds directly to the twelfth step. If it does not fall within the first alarm zone, the process proceeds to the fourth step.

[0054] The fourth step is to determine whether the distance to the obstacle falls within another alarm zone. If the determination is yes, proceed to the fifth step; if the determination is no, proceed to the eleventh step.

[0055] Fifth step: Determine if a flag is set. If yes, proceed to sixth step; if no, proceed to eighth step.

[0056] Step 6: Detect whether the distance to the obstacle is not greater than the standard value. If the determination is yes, the obstacle is identified as the first alarm zone, and the determination result is provided to the buzzer alarm module. Then proceed to step 12; if the determination is no, proceed to step 7.

[0057] Step 7: Determine the alarm zone of the obstacle based on the distance value of the obstacle, provide the determination result to the buzzer alarm module, cancel the setting of the flag bit, and then proceed to step 12;

[0058] Step 8: Determine if the obstacle alarm area identified in the previous round is the first alarm area. If yes, proceed to step 9; if no, proceed to step 10.

[0059] Step 9: Determine that the obstacle is in the first alarm zone and maintain this determination for a first fixed alarm time, and provide the determination result to the buzzer alarm module, then proceed to step 12;

[0060] Step 10: Determine the alarm zone of the obstacle based on the distance value of the obstacle, and provide the determination result to the buzzer alarm module, then proceed to step 12;

[0061] Step 11: Determine that the obstacle alarm area is the same as the obstacle alarm area determined in the previous round, maintain this determination result for the second fixed alarm time, and cancel the setting of the flag bit. Then, provide the determination result to the buzzer alarm module, and then proceed to step 12.

[0062] Step 12: Determine if the alarm area determined by the processing module is closer to the vehicle than the existing alarm area of ​​the buzzer alarm module. If yes, proceed to step 13; if no, return to step 1.

[0063] Step 13: The buzzer alarm module sounds an alarm based on the nearest alarm area.

[0064] In one embodiment, in the sixth step, the standard value is set to 55 cm. When a flag is set and the obstacle distance value is not greater than 55 cm, to avoid possible misjudgment by the processing module, it is directly determined to be the first alarm zone. In the second step, whether the frequency fluctuation of the sensor echo increases is used to determine whether an obstacle has entered the blind zone. When the frequency fluctuation increases, it is determined that an obstacle has entered the blind zone. At this time, a flag is set to mark the situation where an obstacle has entered the blind zone.

[0065] In another embodiment, in step nine, the first fixed alarm time can be 1.5 seconds; in step eleven, the second fixed alarm time can be 1.5 seconds. The first fixed alarm time and the second fixed alarm time do not necessarily have to be the same, and can be different.

[0066] During the final judgment, if the echo signal processing result indicates no obstruction, the alarm area from the previous round of judgment is maintained for 1.5 seconds before proceeding to the next round of detection. Similarly, the duration of the judgment can be adjusted as needed.

[0067] This invention provides a vehicle-mounted ultrasonic blind spot detection system and method. By setting marker positions and distinguishing the characteristics of obstacles and entering blind spots, the sensor module can enhance the identification of obstacles and entering blind spots, reduce the false alarms of the alarm, and improve detection accuracy.

[0068] Compared with existing technologies, the vehicle-mounted ultrasonic blind spot detection system provided by this invention improves the alarm processing of obstacles in blind spots by setting marker positions and anti-shake and anti-misoperation measures, reduces the possibility of system misjudgment, improves alarm accuracy, and reduces user annoyance.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

[0070] 1: Sensor Module 2: Processing Module 3: Buzzer Alarm Module

Claims

1. A vehicle-mounted ultrasonic blind spot detection system, comprising a sensor module, a processing module, and a buzzer alarm module; the sensor module is used to control a sensor to emit waves for 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; the vehicle-mounted ultrasonic blind spot detection system divides the distance behind the vehicle into multiple alarm zones, with the closest zone to the rear of the vehicle being the first alarm zone; the execution flow of the vehicle-mounted ultrasonic blind spot detection system includes the following steps: Step 1, the sensor emits waves for detection, and the processing module processes the echo to determine whether the echo frequency distortion has increased; if not, proceed directly to Step 3; if it has increased, proceed to Step 2; Step 2, set the flag, and then proceed to Step 3; The third step involves confirming the distance to an obstacle based on echo processing, determining whether the distance to the obstacle belongs to the first alarm zone. If it does, the determination result is provided to the buzzer alarm module, and the process proceeds directly to the twelfth step. If it does not belong to the first alarm zone, the process proceeds to the fourth step. The fourth step involves determining whether the distance to the obstacle belongs to another alarm zone. If yes, the process proceeds to the fifth step; if no, the process proceeds to the eleventh step. The fifth step involves determining whether a flag is set. If yes, the process proceeds to the sixth step; if no, the process proceeds to the eighth step. The sixth step involves detecting whether the distance value of the obstacle is not greater than a standard value. If yes, the obstacle is determined to be in the first alarm zone, and the determination result is provided to the buzzer alarm module, then the process proceeds to the twelfth step. If the determination is negative, proceed to step seven; Step seven: Determine the alarm zone of the obstacle based on the distance value of the obstacle, provide the determination result to the buzzer alarm module, and cancel the setting of the flag bit, then proceed to step twelfth; Step eight: Determine whether the obstacle alarm zone determined in the previous round is the first alarm zone. If the determination is positive, proceed to step nine; if the determination is negative, proceed to step ten. Step 9: Determine that the obstacle is within the first alarm zone and maintain this determination for a first fixed alarm time. Provide the determination result to the buzzer alarm module, then proceed to Step 12. Step 10: Determine the alarm zone of the obstacle based on its distance value and provide the determination result to the buzzer alarm module, then proceed to Step 12. Step 11: Determine that the obstacle alarm zone is the same as the obstacle alarm zone determined in the previous round, maintain this determination for a second fixed alarm time, and cancel the flag setting. Then provide the determination result to the buzzer alarm module, then proceed to Step 12. Step 12: Determine whether the alarm zone determined by the processing module is closer to the vehicle than the existing alarm zone of the buzzer alarm module. If the determination is yes, proceed to Step 13. If the determination is negative, return to step one; and step thirteen, whereby the buzzer alarm module sounds an alarm based on the nearest alarm area.

2. The vehicle-mounted ultrasonic blind spot detection system according to claim 1, wherein, In step six, the standard value is set at 55 cm.

3. The vehicle-mounted ultrasonic blind spot detection system according to claim 1, wherein, In the ninth step, the first fixed alarm time is 1.5 seconds.

4. The vehicle-mounted ultrasonic blind spot detection system according to claim 1, wherein, 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, wherein, 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, wherein, In the second step, the presence of an obstacle entering the blind zone is determined by whether the frequency fluctuation of the sensor echo increases. When the frequency fluctuation increases, it is determined that an obstacle has entered the blind zone, and a flag is set to mark the situation where an obstacle has entered the blind zone.

7. The vehicle-mounted ultrasonic blind spot detection system according to claim 1, wherein, In step eleven, the second fixed alarm time is 1.5 seconds.

8. A vehicle-mounted ultrasonic blind spot detection method, comprising the following steps: A vehicle-mounted ultrasonic blind spot detection system is provided, comprising a sensor module, a processing module, and a buzzer alarm module; the sensor module is used to control a sensor to emit waves for 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 for alarm operation, wherein the vehicle-mounted ultrasonic blind spot detection system divides the distance behind the vehicle into multiple alarm zones, with the closest segment to the rear of the vehicle being a first alarm zone; Step 1: The sensor emits waves for detection, and the processing module processes the echo to determine whether the echo frequency oscillation has increased. If it has not increased, proceed directly to Step 3; if it has increased, proceed to Step 2; Step 2: Set the flag, and then proceed to Step 3; The third step involves confirming the distance to an obstacle based on echo processing, determining whether the distance to the obstacle belongs to the first alarm zone. If it does, the determination result is provided to the buzzer alarm module, and the process proceeds directly to the twelfth step. If it does not belong to the first alarm zone, the process proceeds to the fourth step. The fourth step involves determining whether the distance to the obstacle belongs to another alarm zone. If yes, the process proceeds to the fifth step; if no, the process proceeds to the eleventh step. The fifth step involves determining whether a flag is set. If yes, the process proceeds to the sixth step; if no, the process proceeds to the eighth step. The sixth step involves detecting whether the distance value of the obstacle is not greater than a standard value. If yes, the obstacle is determined to be in the first alarm zone, and the determination result is provided to the buzzer alarm module, then the process proceeds to the twelfth step. If the determination is negative, proceed to step seven; Step seven: Determine the alarm zone of the obstacle based on the distance value of the obstacle, provide the determination result to the buzzer alarm module, and cancel the setting of the flag bit, then proceed to step twelfth; Step eight: Determine whether the obstacle alarm zone determined in the previous round is the first alarm zone. If the determination is positive, proceed to step nine; if the determination is negative, proceed to step ten. Step 9: Determine that the obstacle is within the first alarm zone and maintain this determination for a first fixed alarm time. Provide the determination result to the buzzer alarm module, then proceed to Step 12. Step 10: Determine the alarm zone of the obstacle based on its distance value and provide the determination result to the buzzer alarm module, then proceed to Step 12. Step 11: Determine that the obstacle alarm zone is the same as the obstacle alarm zone determined in the previous round, maintain this determination for a second fixed alarm time, and cancel the flag setting. Then provide the determination result to the buzzer alarm module, then proceed to Step 12. Step 12: Determine whether the alarm zone determined by the processing module is closer to the vehicle than the existing alarm zone of the buzzer alarm module. If the determination is yes, proceed to Step 13. If the determination is negative, return to step one; and step thirteen, whereby the buzzer alarm module sounds an alarm based on the nearest alarm area.

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