Vehicle-mounted key control circuit and vehicle

Abstract

The utility model provides a vehicle-mounted key control circuit and a vehicle, and relates to the technical field of vehicle circuits, the vehicle-mounted key control circuit can realize the function of a steering wheel control key by collecting the partial voltage value of a path, and can monitor the voltage in a reference voltage port in real time through a reference path, so that the vehicle-mounted key control circuit can realize the function of the steering wheel control key. Therefore, the voltage value of the pull-up voltage in the acquisition path is accurately obtained, the judgment condition of the partial voltage value can be adjusted in time when the pull-up voltage fluctuates, and the function failure of the steering wheel control key is avoided.

Description

Technical Field

[0001] This utility model relates to the field of vehicle circuit technology, and in particular to an in-vehicle button control circuit and a vehicle. Background Technology

[0002] Steering wheel control buttons are widely used in vehicles, primarily for controlling and adjusting vehicle and entertainment systems. Most steering wheel control buttons function by detecting the button voltage. This is achieved by measuring the voltage drop across the resistance in the steering wheel controller and the pull-up resistor in the vehicle controller. However, due to the complexities of real-world vehicle environments, the pull-up voltage may deviate from the preset value, causing voltage fluctuations and rendering the steering wheel control buttons malfunction. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide an in-vehicle button control circuit and vehicle, which realizes the function of steering wheel control buttons by acquiring the voltage division value of the acquisition path, and monitors the voltage in the reference voltage port in real time through the reference path, thereby accurately obtaining the voltage value of the pull-up voltage in the acquisition path. When the pull-up voltage fluctuates, the judgment conditions of the voltage division value can be adjusted in time to avoid the steering wheel control buttons from malfunctioning.

[0004] In a first aspect, this utility model provides an in-vehicle button control circuit for button control of a vehicle steering wheel; wherein the in-vehicle button control circuit includes: a data acquisition path and a reference path; the data acquisition path includes a button switch and a fourth resistor disposed in the steering wheel controller; the reference path includes: a vehicle controller, a third resistor and a reference voltage port;

[0005] One end of the fourth resistor is grounded; the other end of the fourth resistor is connected to one end of the push-button switch, and the other end of the push-button switch is connected to the first input pin of the vehicle controller and the reference voltage port, respectively; one end of the third resistor is grounded, and the other end of the third resistor is connected to the second input pin of the vehicle controller and the reference voltage port, respectively.

[0006] In some implementations, the acquisition path further includes a first resistor; one end of the first resistor is connected to a reference voltage port; the other end of the first resistor is connected to the other end of a push-button switch and a first input pin of the vehicle controller.

[0007] In some implementations, the reference path further includes a second resistor; one end of the second resistor is connected to a reference voltage port and one end of the first resistor, respectively; the other end of the second resistor is connected to a second input pin and the other end of a third resistor, respectively.

[0008] In some implementations, the vehicle controller includes a first computing unit, the input of which is connected to a first input pin, and the output of which is connected to a function control unit corresponding to the vehicle steering wheel in the vehicle controller.

[0009] In some implementations, the first calculation unit generates a first control command corresponding to the function control unit based on the first voltage division value of the fourth resistor; the first control command is used by the function control unit to control the buttons on the vehicle steering wheel; wherein, the first voltage division value is calculated using the following formula:

[0010] V R4 =V sys *(r1+r4) / r4;

[0011] Among them, V R4 V is the first partial voltage value. sys The reference voltage port outputs the voltage value, r1 is the resistance value of the first resistor, and r4 is the resistance value of the fourth resistor.

[0012] In some implementations, the vehicle controller includes a second computing unit, the input of which is connected to a second input pin, and the output of which is connected to the execution control unit corresponding to the vehicle steering wheel in the vehicle controller.

[0013] In some implementations, the second calculation unit generates a second control instruction corresponding to the execution control unit based on the second voltage divider value of the third resistor; the second control instruction is used to execute the control unit to perform real-time calculation of the voltage value output by the reference voltage port; wherein, the second voltage divider value is calculated using the following formula:

[0014] V R3 =V sys *(r2+r3) / r3;

[0015] Among them, V R3 V is the second voltage divider value. sys The reference voltage port outputs the voltage value, r2 is the resistance value of the second resistor, and r3 is the resistance value of the third resistor.

[0016] In some implementations, the resistance value of the first resistor is in the range of 4K-5K ohms;

[0017] The resistance value of the second resistor is in the range of 4K-5K ohms;

[0018] The resistance value of the third resistor is in the range of 1K-10K ohms;

[0019] The resistance value of the fourth resistor is in the range of 1K-10K ohms.

[0020] In some implementations, the reference voltage of the reference voltage port is 3.3V, 5V, 12V, or 24V.

[0021] Secondly, this utility model provides a vehicle that includes the vehicle-mounted button control circuit mentioned in the first aspect.

[0022] The present invention provides the following beneficial effects:

[0023] This invention provides an in-vehicle button control circuit and a vehicle. The in-vehicle button control circuit is used for button control of a vehicle steering wheel. The circuit includes a data acquisition path and a reference path. The data acquisition path includes a button switch and a fourth resistor disposed in the steering wheel controller. The reference path includes a vehicle controller, a third resistor, and a reference voltage port. One end of the fourth resistor is grounded; the other end of the fourth resistor is connected to one end of the button switch, and the other end of the button switch is connected to the first input pin of the vehicle controller and the reference voltage port. One end of the third resistor is grounded, and the other end of the third resistor is connected to the second input pin of the vehicle controller and the reference voltage port. This in-vehicle button control circuit can realize the function of steering wheel control buttons through the voltage divider value of the data acquisition path, and can monitor the voltage in the reference voltage port in real time through the reference path, thereby accurately obtaining the pull-up voltage value in the data acquisition path. It can also adjust the judgment conditions of the voltage divider value in a timely manner when the pull-up voltage fluctuates, preventing the steering wheel control buttons from malfunctioning.

[0024] Other features and advantages of this utility model will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology of this utility model.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the structure of the first vehicle-mounted button control circuit provided in this embodiment of the utility model;

[0028] Figure 2This is a schematic diagram of the structure of a second type of vehicle-mounted button control circuit provided in an embodiment of the present utility model;

[0029] Figure 3 This is a schematic diagram of the structure of a third type of vehicle-mounted button control circuit provided in this embodiment of the present utility model.

[0030] icon:

[0031] R1 - First resistor; R2 - Second resistor; R3 - Third resistor; R4 - Fourth resistor; V - Reference voltage port; SW1 - Push button switch; ADC1 - First input pin; ADC2 - Second input pin;

[0032] MCU - Vehicle Controller; M1 - First Computing Unit; M2 - Second Computing Unit. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] Steering wheel control buttons are widely used in vehicles, primarily for controlling and adjusting vehicle and entertainment systems. Most steering wheel control buttons function by detecting the button voltage, mainly by using the voltage division between the resistor in the steering wheel controller and the pull-up resistor in the vehicle controller. However, due to the complex real-world vehicle environment, the pull-up voltage may deviate from the preset value, causing voltage fluctuations and potentially malfunctioning the steering wheel control buttons. Therefore, this invention provides an in-vehicle button control circuit and vehicle. This circuit uses the voltage division value of the acquisition path to control the steering wheel buttons and uses a reference path to monitor the voltage in the reference voltage port in real time, accurately obtaining the pull-up voltage value in the acquisition path. This allows for timely adjustment of the voltage division judgment conditions when pull-up voltage fluctuates, preventing steering wheel control button malfunctions.

[0035] To facilitate understanding of this embodiment, a detailed description of a vehicle-mounted button control circuit disclosed in this utility model embodiment will be provided first.

[0036] See Figure 1The diagram shows the structure of the first type of vehicle-mounted button control circuit, which is used for button control of the vehicle steering wheel. The vehicle-mounted button control circuit includes: a data acquisition path and a reference path. The data acquisition path includes a button switch SW1 and a fourth resistor R4 installed in the steering wheel controller. The reference path includes: a vehicle controller MCU, a third resistor R3, and a reference voltage port V.

[0037] One end of the fourth resistor R4 is grounded; the other end of the fourth resistor R4 is connected to one end of the push-button switch SW1, and the other end of the push-button switch SW1 is connected to the first input pin ADC1 and the reference voltage port V of the vehicle controller MCU respectively; one end of the third resistor R3 is grounded, and the other end of the third resistor R3 is connected to the second input pin ADC2 and the reference voltage port V of the vehicle controller MCU respectively.

[0038] Specifically, when the push-button switch SW1 is pressed, the acquisition path is activated. The fourth resistor R4 in the acquisition path generates a voltage under the action of the reference voltage port V. After the first input pin ADC1 of the vehicle controller MCU detects the voltage of the fourth resistor R4, it can compare it with a preset voltage threshold range. If the voltage is within the voltage threshold range, the vehicle controller MCU executes the function corresponding to the button.

[0039] It's worth noting that the third resistor R3 in the reference path is also connected to the reference voltage port V. Under the influence of the reference voltage port V, the third resistor R3 also generates a voltage. This voltage division is detected by the second input pin ADC2 of the vehicle controller MCU. By comparing this voltage with a preset standard voltage value, the real-time voltage fluctuation value of the reference voltage port V can be obtained. Since this voltage fluctuation value affects the voltage division value of the fourth resistor R4 in the acquisition path, and the voltage threshold range of the fourth resistor R4 during threshold judgment remains the original value, a large fluctuation in the voltage division value of the fourth resistor R4 can cause the voltage division value to fall outside the voltage threshold range, resulting in the vehicle controller MCU not executing the function corresponding to the button. In a real-world scenario, the steering wheel button has already been pressed, causing functional failure. Therefore, when the voltage fluctuation value of the reference voltage port V is detected, this fluctuation value is superimposed on the voltage threshold range, compensating for the voltage fluctuation value within the voltage threshold range, thereby preventing the steering wheel control button from malfunctioning.

[0040] See Figure 2 The schematic diagram of the second type of vehicle-mounted button control circuit shown in the figure includes, in some embodiments, a first resistor R1 in the acquisition path; one end of the first resistor R1 is connected to the reference voltage port V; the other end of the first resistor R1 is connected to the other end of the button switch SW1 and the first input pin ADC1 of the vehicle controller MCU.

[0041] The reference path also includes a second resistor R2; one end of the second resistor R2 is connected to the reference voltage port V and one end of the first resistor R1 respectively; the other end of the second resistor R2 is connected to the second input pin ADC2 and the other end of the third resistor R3 respectively.

[0042] Specifically, when the push-button switch SW1 is pressed, the acquisition path is activated. The first resistor R1 acts as a pull-up resistor, and the fourth resistor R4 generates a voltage divider under the influence of the reference voltage port V. After the first input pin ADC1 in the vehicle controller MCU detects the voltage divider of the fourth resistor R4, it can compare it with a preset voltage threshold range. If the voltage is within the voltage threshold range, the vehicle controller MCU executes the function corresponding to the button.

[0043] In the reference path, the third resistor R3 and the second resistor R2 are connected in series to the reference voltage port V. The third resistor R3 generates a voltage divider under the influence of the reference voltage port V and the second resistor R2. This voltage divider is detected by the second input pin ADC2 of the vehicle controller MCU. By comparing this voltage with a preset standard voltage value, the real-time voltage fluctuation value of the reference voltage port V can be obtained. Since this voltage fluctuation value affects the voltage divider value of the fourth resistor R4 in the acquisition path, and the voltage threshold range of the fourth resistor R4 during threshold judgment remains the original value, a large fluctuation in the voltage divider value of the fourth resistor R4 can cause the voltage divider value to fall outside the voltage threshold range. This would cause the vehicle controller MCU to fail to execute the function corresponding to the button, even though the steering wheel button has already been pressed in a real-world scenario, resulting in functional failure. Therefore, when a voltage fluctuation value is detected at the reference voltage port V, this fluctuation value is superimposed on the voltage threshold range to compensate for the voltage fluctuation value, thereby preventing the steering wheel control button from malfunctioning.

[0044] See Figure 3 The diagram shows the structure of the third type of vehicle button control circuit. In this embodiment, the vehicle button control circuit is used in an in-vehicle infotainment system (IVI), and the voltage corresponding to its reference voltage port is SYS_3V3.

[0045] The vehicle controller MCU includes a first computing unit M1. The input terminal of the first computing unit M1 is connected to the first input pin ADC1, and the output terminal of the first computing unit M1 is connected to the function control unit corresponding to the vehicle steering wheel in the vehicle controller MCU.

[0046] The vehicle controller MCU includes a second computing unit M2. The input terminal of the second computing unit M2 is connected to the second input pin ADC2, and the output terminal of the second computing unit M2 is connected to the execution control unit corresponding to the vehicle steering wheel in the vehicle controller MCU.

[0047] The first calculation unit M1 generates a first control command corresponding to the function control unit based on the first voltage division value of the fourth resistor R4; the first control command is used by the function control unit to control the buttons on the vehicle steering wheel; wherein, the first voltage division value is calculated by the following formula:

[0048] V R4 =V sys *(r1+r4) / r4;

[0049] Among them, V R4 V is the first partial voltage value. sys The reference voltage is the output voltage value of the voltage port, r1 is the resistance value of the first resistor R1, and r4 is the resistance value of the fourth resistor R4.

[0050] The second calculation unit M2 generates a second control command corresponding to the execution control unit based on the second voltage divider value of the third resistor R3; the second control command is used to execute the control unit to perform real-time calculation of the voltage value output by the reference voltage port; wherein, the second voltage divider value is calculated by the following formula:

[0051] V R3 =V sys *(r2+r3) / r3;

[0052] Among them, V R3 V is the second voltage divider value. sys The reference voltage is the output voltage value of the voltage port, r2 is the resistance value of the second resistor R2, and r3 is the resistance value of the third resistor R3.

[0053] Specifically, when the push-button switch SW1 is pressed, the acquisition path is turned on, the first resistor R1 is a pull-up resistor, and the fourth resistor R4 generates the first voltage divider value V under the action of the reference voltage port V. R4 =V sys *(r1+r4) / r4, after the first input pin ADC1 in the vehicle controller MCU detects the first voltage division value of the fourth resistor R4, it can compare it with a preset voltage threshold range. If the first voltage division value is within the voltage threshold range, the vehicle controller MCU executes the function corresponding to the button.

[0054] The third resistor R3 and the second resistor R2 in the reference path are connected in series and then connected to the reference voltage port V. Under the action of the reference voltage port V and the second resistor R2, the third resistor R3 generates a second voltage divider value V. R3 =V sys*(r2+r3) / r3, the second voltage divider value is detected by the second input pin ADC2 in the vehicle controller MCU. By comparing the second voltage divider value with the preset standard voltage value, the voltage fluctuation value of the reference voltage port V can be obtained in real time. Since this voltage fluctuation value affects the voltage divider value of the fourth resistor R4 in the acquisition path, and the voltage threshold range of the fourth resistor R4 is still the original value when performing threshold judgment, when the voltage fluctuation range of the fourth resistor R4 is large, it will cause the voltage divider value to not meet the voltage threshold range, causing the vehicle controller MCU not to execute the function corresponding to the button. However, in a real scenario, the steering wheel button has already been pressed, causing the function to fail. Therefore, when the voltage fluctuation value of the reference voltage port V is detected, the fluctuation value is superimposed on the voltage threshold range, so that the voltage fluctuation value is compensated into the voltage threshold range, thereby avoiding the failure of the steering wheel control button.

[0055] In some implementations, the resistance value of the first resistor is in the range of 4K-5K ohms;

[0056] The resistance value of the second resistor is in the range of 4K-5K ohms;

[0057] The resistance value of the third resistor is in the range of 1K-10K ohms;

[0058] The resistance value of the fourth resistor is in the range of 1K-10K ohms.

[0059] In some implementations, the reference voltage of the reference voltage port is 3.3V, 5V, 12V, or 24V.

[0060] As can be seen from the vehicle button control circuit in the above embodiment, the vehicle button control circuit can realize the function of steering wheel control buttons by acquiring the voltage division value of the acquisition path, and monitor the voltage in the reference voltage port in real time through the reference path, thereby accurately obtaining the voltage value of the pull-up voltage in the acquisition path. When the pull-up voltage fluctuates, the judgment condition of the voltage division value can be adjusted in time to avoid the steering wheel control buttons from malfunctioning.

[0061] This utility model embodiment also provides a vehicle that includes the vehicle-mounted button control circuit mentioned in the above embodiment.

[0062] This vehicle-mounted button control circuit is installed in the vehicle. In such vehicles, the steering wheel control buttons can be activated based on the voltage divider value of the acquisition path through the vehicle-mounted button control circuit. The voltage in the reference voltage port is monitored in real time through the reference path, thereby accurately obtaining the voltage value of the pull-up voltage in the acquisition path. When the pull-up voltage fluctuates, the judgment conditions of the voltage divider value can be adjusted in time to avoid the steering wheel control buttons from malfunctioning.

[0063] The vehicle-mounted button control circuit provided in this embodiment of the present invention has the same technical features as the vehicle-mounted button control circuit provided in the foregoing embodiments, and therefore can solve the same technical problems and achieve the same technical effects. For the sake of brevity, any parts not mentioned in the embodiment section can be referred to the corresponding content in the foregoing embodiments.

[0064] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0065] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0066] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0067] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this utility model, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this utility model. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0068] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A vehicle-mounted button control circuit, characterized in that, The vehicle-mounted button control circuit is used for button control of the vehicle steering wheel; wherein, the vehicle-mounted button control circuit includes: a data acquisition path and a reference path; the data acquisition path includes a button switch and a fourth resistor disposed in the steering wheel controller; the reference path includes: a vehicle controller, a third resistor and a reference voltage port; One end of the fourth resistor is grounded; the other end of the fourth resistor is connected to one end of the push-button switch, and the other end of the push-button switch is connected to the first input pin of the vehicle controller and the reference voltage port, respectively; one end of the third resistor is grounded, and the other end of the third resistor is connected to the second input pin of the vehicle controller and the reference voltage port, respectively.

2. The vehicle-mounted button control circuit according to claim 1, characterized in that, The acquisition path also includes a first resistor; one end of the first resistor is connected to the reference voltage port; the other end of the third resistor is connected to the other end of the push-button switch and the first input pin of the vehicle controller.

3. The vehicle-mounted button control circuit according to claim 2, characterized in that, The reference path further includes a second resistor; one end of the second resistor is connected to the reference voltage port and one end of the first resistor respectively; the other end of the second resistor is connected to the second input pin and the other end of the third resistor respectively.

4. The vehicle-mounted button control circuit according to claim 2, characterized in that, The vehicle controller includes a first computing unit, the input terminal of which is connected to the first input pin, and the output terminal of which is connected to the function control unit corresponding to the vehicle steering wheel in the vehicle controller.

5. The vehicle-mounted button control circuit according to claim 4, characterized in that, The first calculation unit generates a first control command corresponding to the functional control unit based on the first voltage division value of the fourth resistor; the first control command is used by the functional control unit to control the buttons on the vehicle steering wheel; wherein, the first voltage division value is calculated using the following formula: V R4 =V sys *(r1+r4) / r4; Among them, V R4 V is the first voltage divider value. sys The voltage value output by the reference voltage port is r1, the resistance value of the first resistor is r1, and the resistance value of the fourth resistor is r4.

6. The vehicle-mounted button control circuit according to claim 3, characterized in that, The vehicle controller includes a second computing unit, the input terminal of which is connected to the second input pin, and the output terminal of which is connected to the execution control unit corresponding to the vehicle steering wheel in the vehicle controller.

7. The vehicle-mounted button control circuit according to claim 6, characterized in that, The second calculation unit generates a second control command corresponding to the execution control unit based on the second voltage divider value of the third resistor; the second control command is used by the execution control unit to perform real-time calculation on the voltage value output by the reference voltage port; wherein, the second voltage divider value is calculated using the following formula: In R3 =V sys *(r2+r3) / r3; Among them, V R3 V is the second voltage divider value. sys r1 is the voltage value output from the reference voltage port, r2 is the resistance value of the second resistor, and r3 is the resistance value of the third resistor.

8. The vehicle-mounted button control circuit according to claim 3, characterized in that, The resistance value of the first resistor is in the range of 4K-5K ohms; The resistance value of the second resistor is in the range of 4K-5K ohms; The resistance value of the third resistor is in the range of 1K-10K ohms; The resistance value of the fourth resistor is in the range of 1K-10K ohms.

9. The vehicle-mounted button control circuit according to claim 1, characterized in that, The reference voltage of the reference voltage port is 3.3V, 5V, 12V or 24V.

10. A vehicle, characterized in that, The vehicle includes the vehicle-mounted button control circuit according to any one of claims 1 to 9.

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