Ultrasonic sensor temperature confirmation method

Abstract

The invention provides an ultrasonic sensor temperature confirmation method. The ultrasonic sensor temperature confirmation method comprises the steps that the body temperature T2 of an ultrasonic sensor installed on an automobile is collected; the acquisition result is analyzed, if the body temperature T2 is successfully acquired, the transducer temperature T3 is acquired, and the final temperature of the ultrasonic sensor is calculated according to the transducer temperature T3 and the body temperature T2; and if the body temperature T2 is not successfully collected, the outdoor temperature T1 of the automobile is obtained, and the final temperature of the ultrasonic sensor is calculated according to the transducer temperature T3 and the outdoor temperature T1 of the automobile. In consideration of different key parameters, such as transducer resonant frequency, impedance, sensor gain, ground noise and the like, better performance can be embodied after temperature influence compensation, so that measurement of the temperature of the ultrasonic sensor has an important effect on the stability of the whole vehicle body.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic sensors, and in particular to a temperature confirmation method of an ultrasonic sensor. Background Art

[0002] The ultrasonic radar parking system consists of 1 host, 4 parking radar sensors and 8 reversing radar sensors. Temperature characteristics are an important physical characteristic of ultrasonic sensors. The electronic components in ultrasonic sensors are mainly semiconductors, and many important parameters are greatly affected by temperature, such as the resonant frequency of ultrasonic sensors, the conversion efficiency between electrical energy and acoustic energy of sensors, and the gain of sensors. The traditional temperature acquisition strategy is for the host ECU to directly collect the ambient temperature detected by the car.

[0003] However, the current temperature acquisition strategy has the following disadvantages: the ambient temperature detected by the car responds slowly to the actual temperature change of the environment; there is only one body temperature input; the temperature difference of sensors installed in different positions of the body is not taken into account. Since the sensors are installed around the car and the layout of various power modules inside the body will cause a large difference in the temperature of different positions of the body, such as the temperature near the air conditioner or the engine is obviously much higher. Therefore, the real-time temperature of sensors in different positions is different. Summary of the invention

[0004] The object of the present invention is to provide a method for confirming the temperature of an ultrasonic sensor to improve the above-mentioned problem.

[0005] In order to achieve the above objectives, the present application provides the following technical solutions:

[0006] A method for confirming temperature of an ultrasonic sensor, comprising:

[0007] Collect the body temperature T2 of the ultrasonic sensor installed on the car;

[0008] The collection results are analyzed, wherein, if the body temperature T2 is successfully collected, the transducer temperature T3 is obtained, and the final temperature of the ultrasonic sensor is calculated based on the transducer temperature T3 and the body temperature T2; if the body temperature T2 is not successfully collected, the outdoor temperature T1 of the car is obtained, and the final temperature of the ultrasonic sensor is calculated based on the transducer temperature T3 and the outdoor temperature T1 of the car.

[0009] Optionally, the body temperature T2 of the ultrasonic sensor installed on the vehicle is collected, including:

[0010] The temperature data inside the application-specific integrated circuit ASIC in the ultrasonic sensor or the temperature data of the PCBA board is collected as the body temperature T2 of the ultrasonic sensor.

[0011] Optionally, an NTC temperature sensor is installed on an application specific integrated circuit ASIC or a PCBA board to collect temperature data.

[0012] Optionally, analyzing the collection results includes:

[0013] During the acquisition, if there is a numerical value output, the acquired temperature data is used as the main body temperature T2 of the ultrasonic sensor and proves that the main body temperature T2 is successfully acquired; otherwise, it proves that the main body temperature T2 is not successfully acquired.

[0014] Optionally, obtaining the transducer temperature T3 includes:

[0015] Calculate the change in resonant frequency between the resonant frequency of the transmitting circuit and the resonant frequency of the receiving circuit in the transducer at 25°C; calculate the change in resonant frequency between the resonant frequency of the transmitting circuit and the resonant frequency of the receiving circuit in the transducer at 0°C; calculate the change in resonant frequency between the resonant frequency of the transmitting circuit and the resonant frequency of the receiving circuit in the transducer at -40°C;

[0016] A temperature-resonance frequency change curve is constructed with temperature as the horizontal coordinate and the resonant frequency change as the vertical coordinate; the resonant frequency change corresponding to the current transducer is input into the temperature-resonance frequency change curve to obtain the transducer temperature T3.

[0017] Optionally, calculating the final temperature of the ultrasonic sensor according to the transducer temperature T3 and the body temperature T2 includes:

[0018] The transducer temperature T3 and the body temperature T2 are analyzed. If |T3-T2|>5°C and T2<25°C and T3<25°C, the body temperature T3 is used as the final temperature of the ultrasonic sensor. Otherwise, the transducer temperature T2 is used as the final temperature of the ultrasonic sensor.

[0019] Optionally, the final temperature of the ultrasonic sensor is calculated according to the transducer temperature T3 and the outdoor temperature T1 of the vehicle, including:

[0020] The transducer temperature T3 and the car outdoor temperature T1 are analyzed. If |T3-T1|>5°C and T1<25°C and T3<25°C, the body temperature T3 is used as the final temperature of the ultrasonic sensor. Otherwise, the transducer temperature T1 is used as the final temperature of the ultrasonic sensor.

[0021] The beneficial effects of the present invention are:

[0022] The method of the present invention can reduce the misjudgment of obstacle measurement by sensors due to sudden changes in ambient temperature. For example, in winter in the north, the instantaneous temperature difference when a car goes from a garage to the outdoors can reach more than ten or even twenty degrees. The performance of sensors at different positions of the car body varies little between individuals due to the independence of temperature processing. Different key parameters, such as transducer resonant frequency, impedance, sensor gain, bottom noise and other parameters, have better performance after compensation for the influence of temperature. The compensation of important sensor parameters affected by temperature is processed in the sensor. The stability of obstacle measurement in the full temperature range is improved and will not change significantly with temperature changes.

[0023] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by implementing the embodiments of the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic flow chart of a method for confirming temperature of an ultrasonic sensor in an embodiment of the present invention;

[0026] Figure 2 is a diagram of the first simulation result of the transducer in an embodiment of the present invention;

[0027] Figure 3 is a temperature-resonance frequency variation curve diagram in an embodiment of the present invention;

[0028] Figure 4 1 is a diagram of the second simulation result of the transducer in the embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals or letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0031] Example 1

[0032] A method for confirming temperature of an ultrasonic sensor, comprising:

[0033] Step S1, collecting the body temperature T2 of the ultrasonic sensor installed on the car;

[0034] In this step, the position of the ultrasonic sensor is not specifically limited. Meanwhile, the specific implementation steps of this step include step S11;

[0035] Step S11, collecting the temperature data inside the application-specific integrated circuit ASIC in the ultrasonic sensor or the temperature data of the PCBA board as the body temperature T2 of the ultrasonic sensor.

[0036] In this step, the temperature data inside the application-specific integrated circuit ASIC and the temperature data of the PCBA board can be measured in the manner of step S111;

[0037] Step S111, installing an NTC temperature sensor on the application-specific integrated circuit ASIC or PCBA board for collection;

[0038] Step S2, analyzing the acquisition results, wherein if the body temperature T2 is successfully acquired, the transducer temperature T3 is acquired, and the final temperature of the ultrasonic sensor is calculated based on the transducer temperature T3 and the body temperature T2; if the body temperature T2 is not successfully acquired, the outdoor temperature T1 of the car is acquired, and the final temperature of the ultrasonic sensor is calculated based on the transducer temperature T3 and the outdoor temperature T1 of the car.

[0039] In step S2, the outdoor temperature T1 of the automobile can be collected by a conventional collection method, and this step is not specifically limited; the specific implementation steps of analyzing the collection results include step S21;

[0040] Step S21, when collecting, if there is a numerical value output, the obtained temperature data is used as the main body temperature T2 of the ultrasonic sensor and proves that the main body temperature T2 is successfully collected, otherwise, it proves that the main body temperature T2 is not successfully collected.

[0041] Meanwhile, in step S2, the specific implementation steps of obtaining the transducer temperature T3 include step S22 and step S23;

[0042] Step S22, calculating the resonant frequency change between the resonant frequency of the transmitting circuit and the resonant frequency of the receiving circuit in the transducer under the condition of 25°C; calculating the resonant frequency change between the resonant frequency of the transmitting circuit and the resonant frequency of the receiving circuit in the transducer under the condition of 0°C; calculating the resonant frequency change between the resonant frequency of the transmitting circuit and the resonant frequency of the receiving circuit in the transducer under the condition of -40°C;

[0043] Before confirming this step, a simulation was performed, taking the murata (model: MAX-22-0079) transducer simulation as an example:

[0044] Figure 2 This is the first simulation result of the transducer. Figure 2 In the figure, the first group of three curves are AC sweep curves of the transmitting frequency of the transducer at 25℃, 0℃ and -40℃, and the second group are AC sweep curves of the receiving circuit at 25℃, 0℃ and -40℃. From the comparison of the curves, it can be seen that at the same temperature, the resonant frequency fp of the transmitting circuit is inconsistent with the resonant frequency fp of the receiving circuit. The temperature T3 of the transducer can be inferred by monitoring the change Δfp between the resonant frequency fp of the transmitting circuit and the resonant frequency fp of the receiving circuit (subtracting the resonant frequency fp of the receiving circuit from the resonant frequency fp of the transmitting circuit).

[0045] At the same time, in this step, the resonant frequency change Δfp (kHz) corresponding to 25°C is 0; the resonant frequency change Δfp (kHz) corresponding to 0°C is 1.52; the resonant frequency change Δfp (kHz) corresponding to -40°C is 2.49; these three sets of data are reflected in the coordinate axis, and the temperature-resonant frequency change curve can be constructed by fitting according to these three sets of data, as shown in FIG. Figure 3 shown.

[0046] Step S23, constructing a temperature-resonance frequency change curve with temperature as the horizontal coordinate and the resonant frequency change as the vertical coordinate; inputting the resonant frequency change corresponding to the current transducer into the temperature-resonance frequency change curve to obtain the transducer temperature T3.

[0047] Meanwhile, in step S2, the specific implementation steps of calculating the final temperature of the ultrasonic sensor according to the transducer temperature T3 and the body temperature T2 include step S24;

[0048] Step S24, analyzing the transducer temperature T3 and the body temperature T2, if |T3-T2|>5°C and T2<25°C and T3<25°C, then the body temperature T3 is used as the final temperature of the ultrasonic sensor, otherwise, the transducer temperature T2 is used as the final temperature of the ultrasonic sensor.

[0049] Meanwhile, in step S2, the specific implementation steps of calculating the final temperature of the ultrasonic sensor according to the transducer temperature T3 and the outdoor temperature T1 of the vehicle include step S25;

[0050] Step S25, analyzing the transducer temperature T3 and the outdoor temperature T1 of the automobile, if |T3-T1|>5°C and T1<25°C and T3<25°C, then the body temperature T3 is used as the final temperature of the ultrasonic sensor, otherwise the transducer temperature T1 is used as the final temperature of the ultrasonic sensor.

[0051] Before confirming step S24 and step S25, a simulation is performed, taking the simulation of the murata (model: MAX-22-0079) transducer as an example:

[0052] Figure 4 This is the result of the second simulation of the transducer. Figure 4In the figure, the first group of three curves are AC scanning curves of the transmitting frequency of the transducer at 85℃, 25℃ and -40℃, and the second group are AC scanning curves of the receiving resistance impedance at 85℃, 25℃ and -40℃. From the simulation data, it can be obtained that when the temperature is >25℃, the transducer is not very sensitive to temperature, but when the temperature is <25℃, the transducer is very sensitive to temperature changes. Therefore, different comparative analysis methods are used in step S24 and step S25 to confirm the final temperature of the ultrasonic sensor.

[0053] Taking into account different key parameters, such as transducer resonant frequency, impedance, sensor gain, noise floor and other parameters, better performance is achieved after compensation for temperature influence. Therefore, measuring the temperature of the ultrasonic sensor plays an important role in the stability of the entire vehicle body.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for confirming temperature using an ultrasonic sensor, characterized in that: include: Collect the body temperature T2 of the ultrasonic sensor installed on the car; The acquisition result is analyzed, wherein if the body temperature T2 is successfully acquired, the transducer temperature T3 is acquired, and the final temperature of the ultrasonic sensor is calculated according to the transducer temperature T3 and the body temperature T2; If the body temperature T2 is not successfully collected, the outdoor temperature T1 of the vehicle is acquired, and the final temperature of the ultrasonic sensor is calculated based on the transducer temperature T3 and the outdoor temperature T1 of the vehicle.

2. The ultrasonic sensor temperature confirmation method according to claim 1, characterized in that: The body temperature T2 of the ultrasonic sensor installed on the car is collected, including: The temperature data inside the application-specific integrated circuit ASIC in the ultrasonic sensor or the temperature data of the PCBA board is collected as the body temperature T2 of the ultrasonic sensor.

3. The ultrasonic sensor temperature confirmation method according to claim 2, characterized in that: An NTC temperature sensor is installed on the application-specific integrated circuit ASIC or PCBA board to collect temperature data.

4. The ultrasonic sensor temperature confirmation method according to claim 1, characterized in that: Analyzing the collection results includes: During the acquisition, if there is a numerical value output, the acquired temperature data is used as the main body temperature T2 of the ultrasonic sensor and proves that the main body temperature T2 is successfully acquired; otherwise, it proves that the main body temperature T2 is not successfully acquired.

5. The ultrasonic sensor temperature confirmation method according to claim 1, characterized in that: Obtaining the transducer temperature T3 includes: Calculate the change in resonant frequency between the resonant frequency of the transmitting circuit and the resonant frequency of the receiving circuit in the transducer at 25°C; calculate the change in resonant frequency between the resonant frequency of the transmitting circuit and the resonant frequency of the receiving circuit in the transducer at 0°C; calculate the change in resonant frequency between the resonant frequency of the transmitting circuit and the resonant frequency of the receiving circuit in the transducer at -40°C; A temperature-resonance frequency change curve is constructed with temperature as the horizontal coordinate and the resonant frequency change as the vertical coordinate; the resonant frequency change corresponding to the current transducer is input into the temperature-resonance frequency change curve to obtain the transducer temperature T3.

6. The ultrasonic sensor temperature confirmation method according to claim 1, characterized in that: The final temperature of the ultrasonic sensor is calculated according to the transducer temperature T3 and the body temperature T2, including: The transducer temperature T3 and the body temperature T2 are analyzed. If |T3-T2|>5°C and T2<25°C and T3<25°C, the body temperature T3 is used as the final temperature of the ultrasonic sensor. Otherwise, the transducer temperature T2 is used as the final temperature of the ultrasonic sensor.

7. The ultrasonic sensor temperature confirmation method according to claim 1, characterized in that: The final temperature of the ultrasonic sensor is calculated according to the transducer temperature T3 and the outdoor temperature T1 of the vehicle, including: The transducer temperature T3 and the car outdoor temperature T1 are analyzed. If |T3-T1|>5°C and T1<25°C and T3<25°C, the body temperature T3 is used as the final temperature of the ultrasonic sensor. Otherwise, the transducer temperature T1 is used as the final temperature of the ultrasonic sensor.

Images