CN214429712U - Diagnostic circuit and vehicle of audio transmission bus - Google Patents
Diagnostic circuit and vehicle of audio transmission bus Download PDFInfo
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- CN214429712U CN214429712U CN202120403947.2U CN202120403947U CN214429712U CN 214429712 U CN214429712 U CN 214429712U CN 202120403947 U CN202120403947 U CN 202120403947U CN 214429712 U CN214429712 U CN 214429712U
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Abstract
The application relates to a diagnostic circuit and a vehicle of an audio transmission bus, wherein the diagnostic circuit comprises: the vehicle-mounted entertainment host is provided with an audio signal output end; the external power amplifier host is provided with an audio signal input end; one end of the audio transmission bus is connected with an audio signal output end of the vehicle-mounted entertainment host, and the other end of the audio transmission bus is connected with an audio signal input end of the external power amplifier host; a diagnostic device configured to generate a diagnostic result of the audio transmission bus in response to a first detection signal generated based on detection of a predetermined audio output signal on the in-vehicle entertainment host side and a second detection signal generated based on detection of a predetermined audio input signal on the external power amplifier host side. According to the embodiment of the application, the on-line diagnosis of the audio transmission bus can be realized, and unnecessary disassembly work is avoided.
Description
Technical Field
The application relates to the field of automobiles, in particular to a diagnostic circuit of an audio transmission bus and a vehicle.
Background
With the development of intelligent vehicles, the vehicle-mounted information entertainment system integrates multiple functions of audio/video playing, navigation, vehicle-mounted communication and the like, and brings comfortable and convenient driving experience to drivers. In order to create better auditory effect, the number of loudspeakers in the automobile sound system is increased, the external power amplifier is applied to the automobile more, a host machine (vehicle entertainment host machine for short) of the vehicle information entertainment system transmits audio to the external power amplifier through a remote audio transmission bus, and the external power amplifier pushes more loudspeakers to produce sound.
In the related art, the audio playing function needs to be disassembled for analysis after the audio playing function fails, and analysis and diagnosis cannot be performed for some fault phenomena sometimes.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems in the related art, the application provides a diagnostic circuit of an audio transmission bus, which can perform online diagnosis on the audio transmission bus and avoid unnecessary disassembly work.
One aspect of the present application provides a diagnostic circuit for an audio transmission bus, including:
the vehicle-mounted entertainment host is provided with an audio signal output end;
the external power amplifier host is provided with an audio signal input end;
one end of the audio transmission bus is connected with an audio signal output end of the vehicle-mounted entertainment host, and the other end of the audio transmission bus is connected with an audio signal input end of the external power amplifier host; and
a diagnostic device configured to generate a diagnostic result of the audio transmission bus in response to the first detection signal and the second detection signal; wherein the first detection signal is generated based on detection of a predetermined audio output signal at the in-vehicle entertainment host side, and the second detection signal is generated based on detection of a predetermined audio input signal at the external power amplifier host side.
In some embodiments, the in-vehicle entertainment host includes a first controller, the external power amplifier host includes a second controller; wherein:
the diagnostic apparatus includes the first controller configured to receive the second detection signal from the second controller; and/or
The diagnostic apparatus includes the second controller configured to receive the first detection signal from the first controller.
In some embodiments, the in-vehicle entertainment host includes a first controller, a first audio signal processor connected to the first controller, and the diagnostic device includes the first controller.
In some embodiments, the in-vehicle entertainment host further comprises a first detection circuit for generating the first detection signal, the first detection circuit being connected with the first controller.
In some embodiments, the external power amplifier host comprises a second controller, a second audio signal processor connected to the second controller, and a second detection circuit for generating the second detection signal, wherein the second detection circuit is connected to the second controller, and the second controller is connected to the first controller.
In some embodiments, the second controller is connected to the first controller via an external bus.
In some embodiments, the first detection circuit includes a resistance voltage division detection circuit, the resistance voltage division detection circuit includes a first resistance and a second resistance serially connected between the first audio signal processor and the ground in sequence, and a connection end of the first resistance and the second resistance is respectively connected with the first controller and the audio signal output end.
In some embodiments, the second detection circuit comprises a third resistor connected in parallel with the second resistor, the third resistor being connected to the second controller and the audio signal input, respectively.
In some embodiments, the in-vehicle entertainment host further comprises a first blocking capacitor connected between the first audio signal processor and the first detection circuit; the external power amplifier host further comprises a second blocking capacitor, and the second blocking capacitor is connected between the second audio signal processor and the audio signal input end.
In some embodiments, the external power amplifier host further comprises a power amplifier assembly coupled to the second audio signal processor, the power amplifier assembly configured to drive a speaker assembly to produce audio under the control of the second controller.
In some embodiments, the diagnostic device configured to generate the diagnostic result of the audio transmission bus in response to the first detection signal and the second detection signal comprises:
generating a normal diagnosis result of the audio transmission bus in response to a monitoring result that the amplitude of the first detection signal is equal to the amplitude of the second detection signal; and/or
Generating a diagnosis result of the audio transmission bus open in response to a monitoring result that the amplitude of the first detection signal is equal to a predetermined reference value and the amplitude of the second detection signal is equal to 0; and/or
And generating a diagnosis result of the audio transmission bus contact fault in response to a monitoring result that the amplitude of the first detection signal is greater than a preset reference value and the amplitude of the second detection signal is less than the preset reference value.
The present application further provides a vehicle having the diagnostic circuit as described above.
In some embodiments of the present application, by enabling the diagnostic device to generate the diagnostic result of the audio transmission bus in response to the first detection signal of the predetermined audio output signal at the vehicle-mounted entertainment host side and the second detection signal of the predetermined audio input signal at the external power amplifier host side, online diagnosis of the audio transmission bus can be realized, and unnecessary disassembly work can be avoided.
In some embodiments of the application, by detecting the signal amplitudes at two ends of the audio transmission bus, the fault condition on a long-distance audio transmission bus line can be monitored in real time in an online manner, and the problem type and range can be conveniently and quickly positioned.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like elements throughout.
Fig. 1 is a schematic structural diagram of a diagnostic circuit of an audio transmission bus according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a diagnostic circuit of an audio transmission bus according to another embodiment of the present application;
fig. 3 shows a schematic structural diagram of a detection circuit according to an embodiment of the present application.
Detailed Description
Preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. 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 also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a diagnostic circuit 100 of an audio transmission bus according to an embodiment of the present application. Referring to fig. 1, the diagnostic circuit 100 of the audio transmission bus of the present embodiment includes an in-vehicle entertainment host 30, an external power amplifier host 40, an audio transmission bus 20, and a diagnostic device 50.
The in-vehicle entertainment host 30 has an audio signal output 32;
the external power amplifier main body 40 is provided with an audio signal input end 42;
one end of the audio transmission bus 20 is connected with the audio signal output end 32 of the in-vehicle entertainment host 30, and the other end is connected with the audio signal input end 42 of the external power amplifier host 40; the audio transmission bus 20 may be a long-distance audio transmission bus, and the transmission distance may be, for example, 10 meters.
A diagnostic device 50 configured to generate a diagnostic result of the audio transmission bus 20 in response to the first detection signal and the second detection signal; wherein the first detection signal is generated based on detection of a predetermined audio output signal at the in-vehicle entertainment host side, and the second detection signal is generated based on detection of a predetermined audio input signal at the external power amplifier host side.
It will be appreciated that the first detection signal and the second detection signal may be periodic detection signals, and the detection period may be several seconds, minutes, hours, days, etc., depending on the actual needs. When the detection period is set to be short, the fault phenomenon which is sometimes not detected can be detected; when the detection period is set to be longer, resources can be saved.
It will be appreciated that the predetermined audio output signal at the in-vehicle entertainment host side may be, but is not limited to, an audio output signal at the audio signal output 32 of the in-vehicle entertainment host 30, for example, the predetermined audio output signal may also be another audio output signal generated by the in-vehicle entertainment host, which is output from the audio signal output 32 after being specifically converted. Similarly, the predetermined audio input signal at the external power amplifier host side may be, but is not limited to, an audio input signal at the audio signal input terminal 42 of the external power amplifier host 40, for example, the predetermined audio input signal may also be another audio input signal obtained by performing specific conversion on the audio input signal at the audio signal input terminal 42.
It is understood that the diagnosis result of the audio transmission bus 20 may include part or all of whether the audio transmission bus 20 is normal, the location of the fault of the audio transmission bus 20, and the type of the fault of the audio transmission bus 20.
In the related art, the audio playing function needs to be disassembled for analysis after the audio playing function fails. In this embodiment, the diagnostic device generates the diagnostic result of the audio transmission bus in response to the first detection signal of the predetermined audio output signal at the vehicle-mounted entertainment host and the second detection signal of the predetermined audio input signal at the external power amplifier host, so that the online diagnosis of the audio transmission bus can be realized, and unnecessary disassembly work can be avoided.
Fig. 2 shows a block diagram of a diagnostic circuit 200 of an audio transmission bus according to another embodiment of the present application. Referring to fig. 2, the diagnostic circuit 200 of the audio transmission bus of the present embodiment includes the in-vehicle entertainment host 30, the external power amplifier host 40, the audio transmission bus 20, and the diagnostic device 50.
The audio transmission bus 20 has one end connected to the audio signal output terminal 32 of the in-vehicle entertainment host 30 and the other end connected to the audio signal input terminal 42 of the external power amplifier host 40. Wherein the audio transmission bus 20 may be a long distance audio transmission bus.
The in-vehicle entertainment host 30 has a first controller 52, a first audio signal processor 38 connected to the first controller 52, a first detection circuit 34 for generating a first detection signal, and an audio signal output terminal 32. The first detection circuit 34 is connected to the first controller 52, and outputs a first detection signal to the first controller 52.
The first controller 52 may be a microcontroller, the first audio signal processor 38 may be an audio digital signal processor, and the in-vehicle entertainment host 30 further includes a first blocking capacitor 36, wherein the first blocking capacitor 36 is connected between the first audio signal processor 38 and the first detection circuit 34.
In some implementations, the first detection circuit 34 includes a voltage detection circuit, which may be implemented by a resistive voltage divider circuit. It will be appreciated that in other embodimentsIn an embodiment, the first detection circuit 34 may also adopt other types of detection circuits, for example, a current detection circuit. In one specific implementation, as shown in fig. 3, the first detection circuit 34 includes a first resistor R serially connected between the first audio signal processor 38 and the ground in turn1And a second resistor R2First resistance R1And a second resistor R2Are connected to the first controller 52 and the audio signal output terminal 32, respectively.
In the in-vehicle entertainment host 30 of the present embodiment, the first controller 52 controls the first audio signal processor 38 to output the digital audio signal, which passes through the DC blocking capacitor and the first resistor R1And a second resistor R2The voltage division results in a long-distance transmission audio bus signal (i.e., an audio output signal on the audio signal output terminal 32), and the audio output signal is input to the first controller 52 as a first detection signal.
The external power amplifier main unit 40 has a second controller 54, a second audio signal processor 48 connected to the second controller 54, a second detection circuit 44 for generating a second detection signal, and an audio signal input terminal 42; the second detection circuit 44 is connected to the second controller 54, and outputs a second detection signal to the second controller 54.
The second controller 54 may be a microcontroller and the second audio signal processor 48 may be an audio digital signal processor; the external power amplifier main body 40 further comprises a second dc blocking capacitor 46, and the second dc blocking capacitor 46 is connected between the audio signal input terminal 42 and the second audio signal processor 48.
In one specific implementation, as shown in FIG. 3, the second detection circuit 44 includes a third resistor R3The third resistor R3 is a termination resistor of the long-distance transmission audio bus, and is connected in parallel with the second resistor R2, one end of the third resistor R3 is connected to the second controller 54 and the second dc blocking capacitor 46, and the other end of the third resistor R3 is grounded.
In this embodiment, the external power amplifier host 40 further comprises a power amplifier assembly 49 coupled to the second audio signal processor 48, the power amplifier assembly 49 being configured to drive a speaker assembly 60 to generate audio under the control of the second controller 54.
In the external power amplifier main unit 40 of this embodiment, the long-distance transmission audio bus signal received by the audio signal input terminal 42 is output to the second controller 54 as the second detection signal, and the signal enters the receiving port of the second audio signal processor 48 after passing through the second dc blocking capacitor 46. The second controller 54 is connected to the second audio signal processor 48, and controls the second audio signal processor 48 to receive the long-distance transmission audio bus signal and transmit the audio signal after sound effect processing to the power amplifier assembly 49. The second controller 54 is also connected to the power amplifier assembly 49, and controls the power amplifier assembly 49 to drive the speaker assembly 60 to emit sound.
The diagnostic device 50 is configured to generate a diagnostic result of the audio transmission bus 20 in response to the first detection signal and the second detection signal.
In this embodiment, the first controller 52 monitors the first detection signal, the second controller 54 monitors the second detection signal, and the diagnostic device 50 includes the first controller 52; the first controller 52 is connected to the second controller 54 via the external bus 56, and obtains the monitoring result of the second controller 54 via the external bus 56, and obtains the diagnosis result of the audio transmission bus 20 according to the first detection signal and the second detection signal. It is understood that the diagnosis result of the audio transmission bus 20 may include part or all of whether the audio transmission bus 20 is normal, a fault location of the audio transmission bus 20, a fault type (e.g., open circuit or contact fault) of the audio transmission bus 20.
In some embodiments, the diagnostic device 50 is configured to generate the diagnostic result of the audio transmission bus 20 in response to the amplitude of the first detection signal and the amplitude of the second detection signal, including:
generating a normal diagnosis result of the audio transmission bus in response to a monitoring result that the amplitude of the first detection signal is equal to the amplitude of the second detection signal; and/or
Generating a diagnosis result of an open audio transmission bus in response to a monitoring result that the amplitude of the first detection signal is equal to a first predetermined reference value and the amplitude of the second detection signal is equal to 0; and/or
And generating a diagnosis result of the audio transmission bus contact fault in response to the monitoring result that the amplitude of the first detection signal is greater than a second preset reference value and the amplitude of the second detection signal is less than the second preset reference value.
Taking the circuit shown in FIG. 3 as an example, assume that the amplitude of the output signal of the first audio signal processor 38 is VppUnder normal operation of the audio transmission bus 20, the amplitude of the first detection signal is (R)2//R3)×Vpp/(R1+(R2//R3) And the amplitude of the second detection signal is (R)2//R3)×Vpp/(R1+(R2//R3) That is, the amplitude of the first detection signal is equal to the amplitude of the second detection signal, and therefore, when the diagnostic device 50 detects that the amplitude of the first detection signal is equal to the amplitude of the second detection signal, a diagnostic result that the audio transmission bus is normal is generated.
Under the condition of open circuit of the audio transmission bus, the amplitude of the first detection signal is R2×Vpp/(R1+R2) The amplitude of the second detection signal is 0; thus, R may be substituted2×Vpp/(R1+R2) As the first predetermined reference value, when the diagnostic device 50 monitors that the amplitude of the first detection signal is equal to the first predetermined reference value and the amplitude of the second detection signal is equal to 0, a diagnostic result of the audio transmission bus open circuit is generated.
When the audio transmission bus is in contact failure, the equivalent to the resistance R existing on the bus0When the amplitude of the first detection signal is (R)2//(R3+R0))×Vpp/(R1+(R2//(R3+R0) ()) which is greater than the amplitude (R) of the normal operation of the audio transmission bus2//R3)×Vpp/(R1+(R2//R3) And the amplitude of the second detection signal is (R)2//(R3+R0))×Vpp×R3/((R1+(R2//(R3+R0)))×(R0+R3) Less than the audio transmission bus positive)Magnitude of normal operating conditions (R)2//R3)×Vpp/(R1+(R2//R3) Therefore, (R) can be2//R3)×Vpp/(R1+(R2//R3) As the second predetermined reference value, when the diagnostic device 50 detects that the amplitude of the first detection signal is greater than the second predetermined reference value and the amplitude of the second detection signal is less than the second predetermined reference value, a diagnostic result of the audio transmission bus contact fault is generated.
In the present embodiment, the diagnostic apparatus 50 includes a first controller 52, so that the in-vehicle entertainment host 30 can obtain the diagnostic result of the audio transmission bus 20 for performing the corresponding subsequent processing. It is understood that in other embodiments, the diagnostic device 50 includes a second controller 54, and the second controller 54 receives the first detection signal from the first controller 52 and generates the diagnostic result of the audio transmission bus 20 in response to the first detection signal and the second detection signal, so that the external power amplifier main body 40 can obtain the diagnostic result of the audio transmission bus 20. In other embodiments, the diagnostic apparatus 50 includes a first controller 52 and a second controller 54, and the first controller 52 (or the second controller 54) generates the diagnostic result of the audio transmission bus 20 in response to the first detection signal and the second detection signal, and outputs the diagnostic result to the second controller 54 (or the first controller 52), so that the in-vehicle entertainment host 30 and the external power amplifier host 40 can both obtain the diagnostic result of the audio transmission bus 20 and perform the corresponding subsequent processing.
The present application also provides a vehicle, which may be a smart vehicle, for example, comprising a diagnostic circuit as described above.
The aspects of the present application have been described in detail hereinabove with reference to the accompanying drawings. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. Those skilled in the art should also appreciate that the acts and modules referred to in the specification are not necessarily required in the present application. In addition, it can be understood that the modules in the device according to the embodiment of the present application may be combined, divided, and deleted according to actual needs.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (12)
1. A diagnostic circuit for an audio transmission bus, comprising:
the vehicle-mounted entertainment host is provided with an audio signal output end;
the external power amplifier host is provided with an audio signal input end;
one end of the audio transmission bus is connected with an audio signal output end of the vehicle-mounted entertainment host, and the other end of the audio transmission bus is connected with an audio signal input end of the external power amplifier host; and
a diagnostic device configured to generate a diagnostic result of the audio transmission bus in response to the first detection signal and the second detection signal; wherein the first detection signal is generated based on detection of a predetermined audio output signal at the in-vehicle entertainment host side, and the second detection signal is generated based on detection of a predetermined audio input signal at the external power amplifier host side.
2. The diagnostic circuit of claim 1, wherein the in-vehicle entertainment host comprises a first controller, the external power amplifier host comprises a second controller; wherein:
the diagnostic apparatus includes the first controller configured to receive the second detection signal from the second controller; and/or
The diagnostic apparatus includes the second controller configured to receive the first detection signal from the first controller.
3. The diagnostic circuit of claim 1, wherein said in-vehicle entertainment host comprises a first controller, a first audio signal processor connected to said first controller, and said diagnostic device comprises said first controller.
4. The diagnostic circuit of claim 3, wherein the in-vehicle entertainment host further comprises a first detection circuit for generating the first detection signal, the first detection circuit being connected to the first controller.
5. The diagnostic circuit of claim 4, wherein the external power amplifier host comprises a second controller, a second audio signal processor coupled to the second controller, and a second detection circuit for generating the second detection signal, wherein the second detection circuit is coupled to the second controller, and wherein the second controller is coupled to the first controller.
6. The diagnostic circuit of claim 5, wherein the second controller is connected to the first controller via an external bus.
7. The diagnostic circuit of claim 5, wherein the first detection circuit comprises a resistor divider detection circuit comprising a first resistor and a second resistor connected in series between the first audio signal processor and ground in sequence, and wherein the connection ends of the first resistor and the second resistor are connected to the first controller and the audio signal output terminal, respectively.
8. The diagnostic circuit of claim 7, wherein the second detection circuit comprises a third resistor connected in parallel with the second resistor, the third resistor being connected to the second controller and the audio signal input, respectively.
9. The diagnostic circuit of claim 5, wherein said in-vehicle entertainment host further comprises a first dc blocking capacitor connected between said first audio signal processor and said first detection circuit; the external power amplifier host further comprises a second blocking capacitor, and the second blocking capacitor is connected between the second audio signal processor and the audio signal input end.
10. The diagnostic circuit of claim 5, wherein the external power amplifier host further comprises a power amplifier assembly coupled to the second audio signal processor, the power amplifier assembly configured to drive a speaker assembly to produce audio under control of the second controller.
11. The diagnostic circuit of any of claims 1 to 10, wherein the diagnostic device, configured to generate the diagnostic result for the audio transmission bus in response to the first detection signal and the second detection signal, comprises:
generating a normal diagnosis result of the audio transmission bus in response to a monitoring result that the amplitude of the first detection signal is equal to the amplitude of the second detection signal; and/or
Generating a diagnosis result of the audio transmission bus open in response to a monitoring result that the amplitude of the first detection signal is equal to a predetermined reference value and the amplitude of the second detection signal is equal to 0; and/or
And generating a diagnosis result of the audio transmission bus contact fault in response to a monitoring result that the amplitude of the first detection signal is greater than a preset reference value and the amplitude of the second detection signal is less than the preset reference value.
12. A vehicle having a diagnostic circuit as claimed in any one of claims 1 to 11.
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| CN202120403947.2U CN214429712U (en) | 2021-02-23 | 2021-02-23 | Diagnostic circuit and vehicle of audio transmission bus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120403947.2U CN214429712U (en) | 2021-02-23 | 2021-02-23 | Diagnostic circuit and vehicle of audio transmission bus |
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| CN214429712U true CN214429712U (en) | 2021-10-19 |
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