CN219162375U - Ultrasonic detection circuit, ultrasonic sensor chip and automobile radar device - Google Patents
Ultrasonic detection circuit, ultrasonic sensor chip and automobile radar device Download PDFInfo
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- CN219162375U CN219162375U CN202221438487.8U CN202221438487U CN219162375U CN 219162375 U CN219162375 U CN 219162375U CN 202221438487 U CN202221438487 U CN 202221438487U CN 219162375 U CN219162375 U CN 219162375U
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The application discloses an ultrasonic detection circuit, an ultrasonic sensor chip and an automobile radar device. The ultrasonic detection circuit includes: control signal generation circuit, ultrasonic transducer and echo signal processing circuit. The control signal generation circuit at least comprises a first control signal transmission mode and a second control signal transmission mode, wherein the first control signal transmission mode is used for controlling the ultrasonic transducer to emit an ultrasonic detection signal with a first frequency by a first control signal so as to detect the distance of an obstacle; the echo signal processing circuit is used for processing echo signals; and the second control signal transmission mode is used for controlling the ultrasonic transducer to transmit an ultrasonic detection signal with a second frequency by using a second control signal when the distance is larger than the first set value or smaller than the second set value so as to detect the distance of the obstacle. According to the scheme, the detection efficiency can be improved.
Description
Technical Field
The present utility model relates to the field of electronic circuits, and more particularly, to an ultrasonic detection circuit, an ultrasonic sensor chip, and an automotive radar apparatus.
Background
Modern automobiles are widely used in ultrasonic detection technology for detecting various obstacles that may be encountered during movement of the automobile.
However, the inventors of the present application have found in the study that the existing vehicle-mounted ultrasonic sensor generally has an effective detection distance of 0.2-1.2m, and if a closer distance needs to be detected, manual adjustment is required, the wavelength of the transmitted ultrasonic wave is set shorter, and then for the remote detection, measurement reflection easily occurs under a rainy and foggy weather, which affects the accuracy of the remote detection. Similarly, if a longer distance needs to be detected, the adjustment needs to be performed manually, the transmitted wavelength is set longer, and then when detecting a near-distance obstacle, the problem that measurement cannot be performed due to too short reflection time can be easily caused. That is, in the prior art, it is not adaptively adjusted according to the distance of the obstacle.
Disclosure of Invention
The embodiment of the application provides an ultrasonic detection circuit, an ultrasonic sensor chip and an automobile radar device, and can adaptively adjust the frequency (wavelength) of detection ultrasonic waves according to the detection distance of an obstacle, so that the detection efficiency is improved.
In a first aspect, the present application provides an ultrasonic detection circuit comprising: a control signal generating circuit, an ultrasonic transducer, and an echo signal processing circuit; the control signal generating circuit is connected with the ultrasonic transducer;
the control signal generation circuit at least comprises a first control signal transmission mode and a second control signal transmission mode, wherein the first control signal transmission mode is used for controlling the ultrasonic transducer to emit an ultrasonic detection signal with a first frequency by a first control signal so as to detect the distance of an obstacle; the echo signal processing circuit is used for processing echo signals; and the second control signal transmission mode is used for controlling the ultrasonic transducer to transmit an ultrasonic detection signal with a second frequency by using a second control signal when the distance is larger than the first set value or smaller than the second set value so as to detect the distance of the obstacle.
With reference to the first aspect, in a possible implementation manner, the second control signal sending mode is configured to control the ultrasonic transducer to send an ultrasonic detection signal with a second frequency when the distance between the obstacles is greater than a first set value, and perform distance detection on the obstacles, where the second frequency is smaller than the first frequency.
With reference to the first aspect, in a possible implementation manner, the second control signal sending mode is configured to control the ultrasonic transducer to send an ultrasonic detection signal with a second frequency when the distance between the obstacles is smaller than a second set value, and perform distance detection on the obstacles, where the second frequency is greater than the first frequency.
With reference to the first aspect, in a possible implementation manner, the control signal generating circuit further includes a third control signal sending mode, configured to control, with a second control signal, the ultrasonic transducer to send an ultrasonic detection signal with a second frequency to perform distance detection on the obstacle when the distance between the obstacles is greater than a first set value, and control, with a third control signal, the ultrasonic transducer to send an ultrasonic detection signal with a third frequency to perform distance detection on the obstacle when the distance between the obstacles is less than the second set value, where the third frequency is greater than the first frequency, and the second set value is less than the first set value.
With reference to the first aspect, in a possible implementation manner, the control signal generating circuit includes a first voltage control signal generating circuit, a second voltage control signal generating circuit, and a third voltage control signal generating circuit;
the first voltage control signal generation circuit is used for receiving the first PWM signal and generating a corresponding first voltage control signal;
the second voltage control signal generating circuit is used for receiving a second PWM signal and generating a corresponding second voltage control signal;
the third voltage control signal generating circuit is used for receiving the third PWM signal and generating a corresponding third voltage control signal.
With reference to the first aspect, in a possible implementation manner, the first set value is 1-1.5m; the second frequency is 1/2 of the first frequency n Doubling;
the second set value is 0.5-0.7m; the third frequency is 2 of the first frequency n Multiple, where n is a preset positive integer.
In a second aspect, the present application provides an ultrasonic sensor chip comprising: a control unit and the ultrasonic detection circuit of the first aspect, wherein the control unit is connected to the control signal generation circuit and the echo signal processing circuit, respectively.
With reference to the second aspect, in a possible implementation manner, the control unit includes a counter to record the number of times of distance detection on the obstacle;
the control unit controls the control signal generation circuit to send out a control signal to set the third frequency to 2 of the first frequency when the number of times recorded by the counter is within a preset number of times when the distance is within the second set value n1 The control signal generating circuit is controlled to send out a control signal to set the third frequency to be 2 times of the first frequency n2 Multiple, wherein n1 and n2 areAnd n1 is larger than n2.
With reference to the second aspect, in a possible implementation manner, the control unit is specifically a CPU.
In a third aspect, the present application provides an automotive radar apparatus, including an MCU and the ultrasonic detection circuit described in the first aspect; the MCU is respectively connected with the control signal generating circuit and the echo signal processing circuit.
With reference to the third aspect, in a possible implementation manner, the MCU is further connected to a counter or a user input unit;
the counter is used for recording the times of detecting the distance of the obstacle; the user input unit is used for inputting preset times;
the control unit controls the control signal generation circuit to send out a control signal to set the third frequency to 2 of the first frequency when the number of times recorded by the counter is within the preset number of times when the distance is within the second set value n1 The control signal generating circuit is controlled to send out a control signal to set the third frequency to be 2 times of the first frequency n2 Multiple, wherein n1 and n2 are positive integers, n1 is greater than n2;
and/or the MCU is also connected with an environment monitoring sensor;
the MCU controls the control signal generating circuit to send a control signal according to the monitoring result of the environment monitoring sensor when the distance is outside the first set value so as to set the second frequency to be 1/2 of the first frequency n3 Multiple or 1/2 n4 Doubling;
the MCU controls the control signal generating circuit to send out a control signal according to the monitoring result of the environment monitoring sensor when the distance is within the second set value so as to set the third frequency to be 2 of the first frequency n3 Multiple or 2 n4 Multiple, wherein n3 and n4 are positive integers and are not equal.
With reference to the third aspect, in a possible implementation manner, the MCU is further connected with an alarm device; and the MCU controls the alarm device to alarm according to the distance of the detected obstacle.
The application provides an ultrasonic detection circuit, including control signal generating circuit, ultrasonic transducer and echo signal processing circuit, control signal generating circuit sends the ultrasonic wave detection signal of first frequency with first control signal ultrasonic transducer, carry out the distance detection, echo signal processing circuit handles echo signal, obtain the distance of surveying, when the distance is greater than first setting, control signal generating circuit can control ultrasonic transducer and send the ultrasonic wave detection signal of the second frequency that is less than first frequency, thereby can be according to the distance of surveying, frequency and the wavelength of self-adaptation adjustment ultrasonic wave detection signal, improve detection efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic structural diagram of an ultrasonic detection circuit in an embodiment of the present application;
FIG. 2 is a schematic diagram of a control signal generation circuit in one embodiment of the present application;
fig. 3 is a schematic structural diagram of an ultrasonic sensor chip according to an embodiment of the present disclosure;
fig. 4 is a schematic structural view of an ultrasonic sensor chip according to another embodiment of the present disclosure;
fig. 5 is a schematic structural view of an automotive radar device according to an embodiment of the present application;
fig. 6 is a schematic structural view of an automotive radar device according to still another embodiment of the present application.
Detailed Description
For a better understanding of the technical solution of the present utility model, the following detailed description of the embodiments of the present utility model refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Referring to fig. 1, an ultrasonic detection circuit is provided in an embodiment of the present application. According to the ultrasonic detection circuit, the frequency of an ultrasonic detection signal can be adaptively adjusted according to the detection distance of the obstacle, and the detection efficiency is improved.
In an embodiment of the present application, the ultrasonic detection circuit includes: a control signal generation circuit 101, an ultrasonic transducer 102, and an echo signal processing circuit 103; the control signal generating circuit 101 is connected to the ultrasonic transducer 102.
The control signal generating circuit 101 includes at least two control signal transmission modes, such as a first control signal transmission mode and a second control signal transmission mode. The first control signal sending mode is used for controlling the ultrasonic transducer 102 to send out an ultrasonic detection signal with a first frequency in an initial state by using a first control signal so as to detect the distance of an obstacle; the echo signal processing circuit 103 is configured to process an echo signal, determine a distance between the echo signal and an obstacle, and in this embodiment of the present application, the distance between the obstacle and the obstacle may be directly obtained by processing by an ultrasonic detection circuit, or may be calculated by other control circuits, such as an MCU circuit, a control unit, etc., connected to the echo signal processing circuit 103.
And a second control signal transmission mode, configured to control the ultrasonic transducer 102 to transmit an ultrasonic detection signal with a second frequency when the distance is greater than the first set value, and perform distance detection on the obstacle, where the second frequency is smaller than the first frequency.
Above-mentioned ultrasonic detection circuit that this application embodiment provided, including control signal generating circuit, ultrasonic transducer and echo signal processing circuit, control signal generating circuit sends the ultrasonic wave detection signal of first frequency with first control signal ultrasonic transducer, carry out the distance detection, echo signal processing circuit handles echo signal, obtain the distance of surveying, when the distance is greater than first setting, control signal generating circuit can control ultrasonic transducer and send the ultrasonic wave detection signal of second frequency less than first frequency, thereby can be according to the distance of surveying, frequency and the wavelength of self-adaptation adjustment ultrasonic wave detection signal, improve detection efficiency.
In an embodiment of the present application, the control signal generating circuit 101 further includes a third control signal sending mode, configured to control, with a third control signal, the ultrasonic transducer 102 to send an ultrasonic detection signal with a third frequency when the distance is smaller than a second set value, and perform distance detection on an obstacle, where the third frequency is greater than the first frequency, and the second set value is smaller than the first set value.
In the embodiment of the present application, the second control signal transmission mode may also be used to control the ultrasonic transducer 102 to send an ultrasonic detection signal with a second frequency when the distance is smaller than a second set value, and perform distance detection on the obstacle, where the second frequency is greater than the first frequency.
The structure and principles of the above-described ultrasonic detection circuit are described below in a more detailed embodiment of the present application.
The ultrasonic detection circuit includes a control signal generation circuit 101, an ultrasonic transducer 102, and an echo signal processing circuit 103.
Specifically, the control signal generating circuit 101 may be connected to a control unit, such as various controllers, control modules, or control chips, so that a control signal may be generated under the control of the control unit to control the frequency of the ultrasonic detection signal by the ultrasonic transducer 102.
In the embodiment of the present application, the control signal generated by the control signal generating circuit 101 may be a control signal in the form of a voltage or a current. Specifically, taking the voltage control signal as an example, the control signal generating circuit 101 may issue a first voltage control signal, a second voltage control signal, a third voltage control signal, and the like.
As shown in fig. 2, the control signal generation circuit 101 includes a first voltage control signal generation circuit 1011, a second voltage control signal generation circuit 1012, and a third voltage control signal generation circuit 1013.
A first voltage control signal generating circuit 1011 for receiving the first PWM signal inputted from the control unit and generating a corresponding first voltage control signal; accordingly, the ultrasonic transducer 102 emits an ultrasonic detection signal at the first frequency.
A second voltage control signal generating circuit 1012 for receiving the second PWM signal input from the control unit and generating a corresponding second voltage control signal; accordingly, the ultrasonic transducer 102 reduces the frequency of the ultrasonic detection signal, thereby increasing the wavelength of the ultrasonic detection signal and outputting the ultrasonic detection signal at the second frequency.
A third voltage control signal generating circuit 1013 for receiving the third PWM signal input from the control unit and generating a corresponding third voltage control signal; accordingly, the ultrasonic transducer 102 expands the frequency of the ultrasonic detection signal at this time, thereby reducing the wavelength of the ultrasonic detection signal and outputting the ultrasonic detection signal at the third frequency.
In this embodiment, the ultrasonic transducer 102 is a device for converting electromagnetic energy into acoustic energy, and includes a resonant unit in the form of piezoelectric ceramic, etc., and can emit ultrasonic waves with corresponding frequencies according to the control signal of the control signal generating circuit 101. Specifically, when the control signal of the control signal generation circuit 101 is the first voltage control signal, the ultrasonic transducer 102 emits an ultrasonic detection signal of the first frequency as a reference. When the control signal of the control signal generating circuit 101 is the second voltage control signal, the ultrasonic transducer 102 reduces the frequency, for example, 1/2 times the frequency, or n times the 1/2 times the frequency, to realize 1/2 n And outputting ultrasonic signals with multiplied frequencies. Conversely, when the control signal of the control signal generation circuit 101 is the third voltage control signal, the frequency can be expanded to 2 n Multiple, where n is a preset positive integer.
The ultrasonic transducer 102 emits an ultrasonic detection signal to detect the distance of the obstacle. In one embodiment of the present application, the ultrasonic transducer may be an integrated device for transmitting and receiving ultrasonic waves, and may receive echo signals reflected by an obstacle, where the ultrasonic transducer 102 is connected to the echo signal processing circuit 103, so that the echo signal processing circuit 103 processes the echo signals. In other embodiments of the present application, the echo signal processing circuit 103 may further include a separate ultrasonic receiving device, and may receive and process the echo signal reflected by the obstacle.
The echo signal processing circuit 103 is configured to process the echo signal, so as to detect the distance of the obstacle, and the distance data may be transmitted to the control unit, so that the control unit further controls the control signal generating circuit 101.
The control signal generation circuit 101 may further include a ranging adjustment module for adjusting the control signal according to the distance acquired by the echo signal processing circuit 103. The ranging adjustment module can be implemented in a control chip, a comparator circuit, or the like.
The control signal generation circuit 101 further performs control, and the specific control principle is:
when the distance is greater than the first set value, a second PWM signal is sent to the control signal generating circuit, so that the control signal generating circuit 101 generates a second voltage control signal, and the ultrasonic transducer 102 reduces the frequency of the ultrasonic wave. In one embodiment, the first set point is preferably 1.2m. The second PWM signal may be a square wave signal of different frequency/duty cycle, thereby reducing the frequency of the ultrasonic wave by different factors, such as 1/2, 1/4 times … … 1/2 n Multiple, etc.
When the distance is smaller than the second set value, a third PWM signal is sent to the control signal generating circuit, so that the control signal generating circuit 101 generates a third voltage control signal, and the ultrasonic transducer 102 amplifies the frequency of the ultrasonic wave. In one embodiment, the second set point is preferably 0.6m. The third PWM signal may be a square wave signal of different frequency/duty cycle, thereby amplifying the frequency of the ultrasonic wave by different factors, such as 2 times, 4 times … … 2 n Multiple, etc.
When the distance is between the first set value and the second set value, the first PWM signal is continuously sent to the control signal generating circuit, so that the ultrasonic transducer 102 continuously keeps transmitting the ultrasonic detection signal with the first frequency. The first PWM signal may be a square wave signal of different frequency/duty cycle, so that the adjustment of the reference value of the first frequency may be achieved.
In one embodiment of the present application, the frequency may be controlled in segments, that is, after the ultrasonic detection circuit is powered on, the ultrasonic transducer is controlled to emit a preset maximum frequency as the first frequency to operate. And when the distance between the detected obstacles is larger than a set first set value, controlling the ultrasonic transducer to reduce the transmitting frequency. And when the distance between the obstacles is smaller than the second set value, performing frequency multiplication processing on the maximum frequency. By the arrangement mode, the control efficiency of frequency switching can be improved, and the circuit cost is simplified.
Referring to fig. 3, in another aspect of the embodiments of the present application, an ultrasonic sensor chip is also provided.
The ultrasonic sensor chip 300 includes a control unit 301 and the ultrasonic detection circuit according to the foregoing embodiment, where the control unit 301 is connected to the control signal generating circuit 101 and the echo signal processing circuit 103, respectively.
The control unit 301 controls the control signal generating circuit 101 according to the distance of the obstacle acquired by the echo signal processing circuit 103, for example, outputs PWM signals of different forms for the control signal generating circuit 101 to generate different voltage control signals, thereby adjusting the frequency of the ultrasonic wave of the ultrasonic transducer 102. The specific principle is not repeated here.
Fig. 4 is a schematic diagram of another ultrasonic sensor chip 300 according to an embodiment of the present application.
The control unit 301 in the ultrasonic sensor chip 300 may be, but not limited to, a CPU, and a counter is built in to record the number of times of distance detection of an obstacle.
In one embodiment, the control unit 301 may control the control signal generating circuit to send a control signal to set the third frequency to 2 of the first frequency when the number of times recorded by the counter is within a preset number of times when the distance is within the second set value n1 The control signal generating circuit is controlled to send out a control signal to set the third frequency to be 2 times of the first frequency n2 And n1 and n2 are positive integers, and n1 is greater than n2. Specifically, for example, when the distance is set to be within 0.6m, the frequency may be adjusted to be 4 times at the time of the first 20-time distance detection, and the frequency may be adjusted to be 2 times at the 20 th and subsequent detections. The mode of adopting accurate measurement in the preset times can be more humanized when the device is just started to be used, and the familiarity of a user to equipment is improved in a matched mode, so that the detection accuracy is improved.
In a third aspect of the embodiments of the present application, an automotive radar apparatus is also provided.
As shown in fig. 5, a schematic diagram of an automotive radar apparatus 400 is shown.
The automotive radar apparatus 400 in this example includes an MCU 401 and an ultrasonic detection circuit. The MCU 401 is connected to the control signal generating circuit 101 and the echo signal processing circuit 103, respectively, for the ultrasonic detection circuit according to the foregoing embodiments.
As shown in fig. 6, an automotive radar apparatus 400 in an embodiment of the present application is shown.
Specifically, the MCU 401 in the automotive radar apparatus 400 includes a counter, so as to implement a counting function. The MCU 401 of the automotive radar apparatus 400 may receive a "novice mode" set by the user, that is: a counter is enabled to record the number of distance detections of the obstacle.
In the "beginner mode", the MCU 401 controls the control signal generating circuit to send out a control signal to set the third frequency to 2 of the first frequency when the number of times recorded by the counter is within a preset number of times when the distance is within the second set value n1 The control signal generating circuit is controlled to send out a control signal to set the third frequency to be 2 times of the first frequency n2 Multiple where n1 and n2 are positive integers, n1 is greater than n2, e.g., n1=2, n2=1, or other alternatives, where n2 may be the same as n, i.e., the non-novice mode state is the standard state.
In the embodiment of the application, only the counter may be set to record the operation times, or only the user input module may be set to determine whether the vehicle is a novice, in one embodiment, the counter and the user input module may be set at the same time, and when the two co-workers record data and are different, the data input by the user input module is used as the basis, if possible, the vehicle has more than one driver.
In addition, in the automotive radar device in the embodiment of the application, the MCU is also connected with an environment monitoring sensor. The environment monitoring sensor can monitor the environment outside the automobile to obtain the monitoring result of the environment, and the MCU adjusts the frequency of the ultrasonic detection signal according to different environments. Specifically, when the distance is outside the first set value, the control signal is controlled according to the monitoring result of the environment monitoring sensorThe number generating circuit sends out a control signal to set the second frequency to 1/2 of the first frequency n3 Multiple or 1/2 n4 Times, e.g. set to 1/2 on sunny days n3 Multiple, 75% humidity set to 1/2 n4 Multiple where n4 is greater than n3, e.g., n3=1, n4=2, or other values, where n3 may be equal to n, i.e., with clear weather as a standard condition. Similarly, when the distance is within the second set value, the control signal generating circuit is controlled to send out a control signal according to the monitoring result of the environment monitoring sensor so as to set the third frequency to be 2 of the first frequency n3 Multiple or 2 n4 Multiple in which n3 and n4 are both positive integers and are not equal, e.g. set to 2 on sunny days n3 Double, 75% humidity set to 2 n4 Multiple where n3 is greater than n4, e.g., n3=2, n4=1, or other values, where n4 may be equal to n, i.e., with clear weather as a standard condition. For example, the environmental monitoring sensor may include a temperature sensor, a humidity sensor, a camera, and the like, and in the case of rain and fog weather, the MCU adjusts the frequency to 2 times when the distance is within a first set value, and adjusts the frequency to 4 times when the weather is fine, which is based on that when the wavelength of the ultrasonic wave is short, the measured reflection in the fog and rain is more likely to occur, thereby affecting the accuracy of the distance.
In the embodiment of the application, the counter or the user input module and the environment detection sensor may be separately set, or may be set simultaneously, when both are present, the frequency is adjusted by the information obtained in the counter or the user input module when the environment detection sensor detects a sunny weather, and the frequency is adjusted by the information obtained in the environment detection sensor when the environment detection sensor detects a rainy-foggy weather (humidity is 75% or more).
According to the automobile radar device, the MCU can be further connected with an alarm device, and the alarm device is controlled to alarm according to the distance of the detected obstacle. For example, in a deceleration parking scenario, an alarm in the form of a reduced vehicle speed may be prompted or suggested.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (12)
1. An ultrasonic detection circuit comprising: a control signal generating circuit, an ultrasonic transducer, and an echo signal processing circuit; the control signal generating circuit is connected with the ultrasonic transducer, and the echo signal processing circuit is used for processing echo signals; it is characterized in that the method comprises the steps of,
the control signal generation circuit at least comprises a first control signal transmission mode and a second control signal transmission mode, wherein the first control signal transmission mode is used for controlling the ultrasonic transducer to emit an ultrasonic detection signal with a first frequency by a first control signal so as to detect the distance of an obstacle;
and the second control signal sending mode is used for controlling the ultrasonic transducer to send out an ultrasonic detection signal with a second frequency by using a second control signal when the distance of the obstacle is larger than a first set value or smaller than a second set value so as to detect the distance of the obstacle.
2. The ultrasonic detection circuit of claim 1, wherein the second control signal transmission mode is configured to control the ultrasonic transducer to emit an ultrasonic detection signal at a second frequency for detecting the distance of the obstacle when the distance of the obstacle is greater than a first set value, and the second frequency is smaller than the first frequency.
3. The ultrasonic detection circuit according to claim 1, wherein the second control signal transmission mode is configured to control the ultrasonic transducer to emit an ultrasonic detection signal with a second frequency for detecting the distance of the obstacle when the distance of the obstacle is smaller than a second set value, and the second frequency is larger than the first frequency.
4. The ultrasonic detection circuit according to claim 2, wherein the control signal generation circuit further includes a third control signal transmission mode for controlling the ultrasonic transducer to emit an ultrasonic detection signal of a second frequency for distance detection of an obstacle when the distance of the obstacle is greater than a first set value, the second frequency being smaller than the first frequency, and controlling the ultrasonic transducer to emit an ultrasonic detection signal of a third frequency for distance detection of an obstacle when the distance is smaller than the second set value, the third frequency being greater than the first frequency, the second set value being smaller than the first set value.
5. The ultrasonic wave detection circuit according to claim 4, wherein the control signal generation circuit includes a first voltage control signal generation circuit, a second voltage control signal generation circuit, and a third voltage control signal generation circuit;
the first voltage control signal generation circuit is used for receiving the first PWM signal and generating a corresponding first voltage control signal;
the second voltage control signal generating circuit is used for receiving a second PWM signal and generating a corresponding second voltage control signal;
the third voltage control signal generating circuit is used for receiving the third PWM signal and generating a corresponding third voltage control signal.
6. The ultrasonic detection circuit of claim 4, wherein the first set point is 1-1.5m; the second frequency is 1/2 of the first frequency n Doubling;
the second set value is 0.5-0.7m; the third frequency is 2 of the first frequency n Multiple, where n is a preset positive integer.
7. An ultrasonic sensor chip, comprising: a control unit and the ultrasonic detection circuit according to any one of claims 1 to 6, wherein the control unit is connected to the control signal generation circuit and the echo signal processing circuit, respectively.
8. The ultrasonic sensor chip of claim 7, wherein,
the control signal generating circuit further comprises a third control signal sending mode, wherein the third control signal sending mode is used for controlling the ultrasonic transducer to send out an ultrasonic detection signal with a second frequency when the distance of the obstacle is larger than a first set value, the second frequency is smaller than the first frequency, and controlling the ultrasonic transducer to send out an ultrasonic detection signal with a third frequency when the distance is smaller than the second set value, the third frequency is larger than the first frequency, and the second set value is smaller than the first set value;
the control unit comprises a counter for recording the times of detecting the distance of the obstacle;
the control unit controls the control signal generation circuit to send out a control signal to set the third frequency to 2 of the first frequency when the number of times recorded by the counter is within a preset number of times when the distance is within the second set value n1 The control signal generating circuit is controlled to send out a control signal to set the third frequency to be 2 times of the first frequency n2 And n1 and n2 are positive integers, and n1 is greater than n2.
9. The ultrasonic sensor chip according to claim 7, characterized in that the control unit, in particular a CPU.
10. An automotive radar device comprising an MCU and the ultrasonic sensor chip of claim 7; the MCU is respectively connected with the control signal generating circuit and the echo signal processing circuit.
11. The automotive radar apparatus according to claim 10, characterized in that,
the control signal generating circuit further comprises a third control signal sending mode, wherein the third control signal sending mode is used for controlling the ultrasonic transducer to send out an ultrasonic detection signal with a second frequency when the distance of the obstacle is larger than a first set value, the second frequency is smaller than the first frequency, and controlling the ultrasonic transducer to send out an ultrasonic detection signal with a third frequency when the distance is smaller than the second set value, the third frequency is larger than the first frequency, and the second set value is smaller than the first set value;
the MCU is also connected with a counter and/or a user input unit;
the counter is used for recording the times of detecting the distance of the obstacle; the user input unit is used for inputting preset times;
the control unit controls the control signal generation circuit to send out a control signal to set the third frequency to 2 of the first frequency when the number of times recorded by the counter is within the preset number of times when the distance is within the second set value n1 The control signal generating circuit is controlled to send out a control signal to set the third frequency to be 2 times of the first frequency n2 Multiple, wherein n1 and n2 are positive integers, n1 is greater than n2;
and/or the MCU is also connected with an environment monitoring sensor;
the MCU controls the control signal generating circuit to send a control signal according to the monitoring result of the environment monitoring sensor when the distance is outside the first set value so as to set the second frequency to be 1/2 of the first frequency n3 Multiple or 1/2 n4 Doubling;
the MCU controls the environment monitoring sensor according to the monitoring result when the distance is within the second set valueThe control signal generating circuit sends out control signals to set the third frequency to 2 of the first frequency n3 Multiple or 2 n4 Multiple, wherein n3 and n4 are positive integers and are not equal.
12. The automotive radar device according to claim 10 or 11, characterized in that the MCU is further connected with an alarm device; and the MCU controls the alarm device to alarm according to the distance of the detected obstacle.
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