CN216034079U - Low-speed driving prompting sound system - Google Patents
Low-speed driving prompting sound system Download PDFInfo
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- CN216034079U CN216034079U CN202121311028.9U CN202121311028U CN216034079U CN 216034079 U CN216034079 U CN 216034079U CN 202121311028 U CN202121311028 U CN 202121311028U CN 216034079 U CN216034079 U CN 216034079U
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Abstract
The utility model provides a low-speed driving warning tone system, includes car machine and low-speed warning tone speaker assembly, and low-speed warning tone speaker contains PWM conversion module, power amplifier module and the speaker of signal of telecommunication connection in proper order. The vehicle-mounted MCU stores the audio frequency of the low-speed prompt tone, is connected with the PWM conversion module through a PWM OUT channel, and outputs the audio frequency to the low-speed prompt tone loudspeaker assembly in a PWM format; the PWM conversion module is used for receiving the vehicle PWM audio signal and then converting the PWM signal into an analog audio signal; the power amplification module is used for amplifying the power of the analog audio signal and driving the loudspeaker to sound; and the loudspeaker module is used for receiving the analog audio signal of the power amplification module to sound. According to the utility model, the audio frequency built in the vehicle machine is transmitted to the low-speed prompt tone loudspeaker assembly for sounding by utilizing the idle PWM channel of the vehicle machine MCU, so that the problem that the vehicle machine cannot drive the low-speed prompt tone loudspeaker because no redundant power amplifier channel exists is solved.
Description
Technical Field
The utility model belongs to the field of automobiles, and particularly relates to a low-speed driving prompting sound system of an automobile.
Background
The low-speed driving prompt mainly aims to meet the requirement of GB/T37153-2018, and the electric vehicle must actively send out warning sound at the speed of 0-20kph to warn pedestrians and other traffic participants.
The solutions used in the industry at present are roughly divided into two types: one is a buzzer with control independently, as shown in fig. 1, and the other is a buzzer directly using a loudspeaker and driven by a vehicle power amplifier to sound, as shown in fig. 2.
The existing scheme has the following defects: the buzzer is used for sounding, the sound user experience is poor and the switching cannot be performed, and meanwhile, the sound of the buzzer does not meet the requirements of the regulation GB/T37153-2018 on sound pressure level, 1/3 octave sound pressure level and frequency shift. With the scheme of car machine drive speaker sound production, require the car machine to need the power amplifier passageway of the exclusive use of the same kind to drive low-speed prompt tone speaker, this increase of car machine power amplifier car, and the car machine of old platform motorcycle type does not have unnecessary power amplifier passageway and is used for driving low-speed prompt tone speaker, and speed prompt tone speaker can't broadcast the built-in audio frequency of car machine and can not update through OTA.
Disclosure of Invention
The utility model provides a low-speed driving warning tone speaker system, through utilizing the idle PWM passageway of car machine MCU to transmit the audio frequency of car machine built-in to low-speed warning tone speaker assembly and carry out the sound production, solve some car machines because do not have unnecessary power amplifier passageway and can't drive the problem of low-speed warning tone speaker.
The utility model adopts the following technical scheme:
the utility model provides a low-speed driving warning sound speaker system, includes car machine MCU and low-speed warning sound speaker assembly, low-speed warning sound speaker contains PWM conversion module, power amplifier module and the speaker of signal of telecommunication connection in proper order.
The vehicle MCU stores the audio frequency of the low-speed prompt tone, is connected with the PWM conversion module through a PWM OUT channel, and outputs the audio frequency to the low-speed prompt tone loudspeaker assembly in a PWM format;
the PWM conversion module is used for receiving the vehicle PWM audio signal and then converting the PWM signal into an analog audio signal;
the power amplification module is used for amplifying the power of the analog audio signal and driving a loudspeaker to sound;
the loudspeaker module receives the analog audio signal of the power amplifier module to sound so as to warn pedestrians and other traffic participants.
The vehicle-mounted MCU is used as a controller for receiving the speed, gear signals and power state signals of the whole vehicle, and outputting audio to the low-speed driving prompt tone loudspeaker assembly through a PWM OUT channel in a PWM format when the sounding condition of the low-speed driving prompt tone is met.
The utility model has the advantages of improving functional experience, meeting the requirements of regulations, reducing the cost of parts and the like, and specifically comprises the following steps:
the utility model fully utilizes the platform function of the existing parts of the whole vehicle, solves the problem that the vehicle of the old platform vehicle type cannot drive the low-speed prompt tone loudspeaker because no redundant power amplifier channel exists, and avoids the cost and the period brought by changing the hardware of the vehicle.
Secondly, the utility model can send out rhythmic sound to replace the buzzer sound in the background technology by utilizing the capability of the car machine, and the sound can be updated through OTA, thereby greatly improving the user experience.
The sound customization degree is high, so that the requirements of the laws and regulations on the sound pressure level of the low-speed driving prompt sound, the 1/3 octave sound pressure level and the frequency shift are completely met.
Drawings
FIG. 1 is a schematic block diagram of a low-speed alarm with a buzzer sounding;
FIG. 2 is a schematic block diagram of a low-speed alarm of a vehicle-mounted device driving a speaker;
FIGS. 3 and 4 are schematic block diagrams of a low speed driving warning tone speaker system based on PWM transmission audio;
FIG. 5 a PWM conversion module;
fig. 6 power amplifier module.
Detailed Description
The technology of the present invention is further explained below with reference to the accompanying drawings:
the low-speed driving prompt tone loudspeaker system based on the PWM transmission audio is shown in fig. 3, an audio file of the low-speed prompt tone system is stored in a vehicle machine MCU memory, the vehicle machine MCU receives the speed, a gear signal and a power supply state signal of the whole vehicle through a CAN, and the vehicle machine is used as a controller to output the audio to the low-speed driving prompt tone loudspeaker assembly through a PWM OUT channel in a PWM format when the sounding condition of the low-speed driving prompt tone is met. Referring to fig. 4, the low speed warning tone speaker assembly includes a PWM conversion module, a power amplification module, and a speaker.
As shown in fig. 5, the PWM conversion module receives a PWM signal output by the MCU of the vehicle, and converts the signal into an analog audio signal.
As shown in fig. 6, the power amplifier module of the low speed warning tone speaker assembly receives the analog audio signal to amplify the power, and outputs the signal to the speaker to be played.
The speaker module of the low-speed prompt tone speaker assembly receives the analog audio signal of the power amplifier and sounds to warn pedestrians and other traffic participants.
Claims (2)
1. A low-speed driving prompt tone system comprises a vehicle machine MCU and a low-speed prompt tone loudspeaker assembly, and is characterized in that the low-speed prompt tone loudspeaker comprises a PWM conversion module, a power amplification module and a loudspeaker which are sequentially connected by electric signals;
the vehicle MCU stores the audio frequency of the low-speed prompt tone, is connected with the PWM conversion module through a PWM OUT channel, and outputs the audio frequency to the low-speed prompt tone loudspeaker assembly in a PWM format;
the PWM conversion module is used for receiving the vehicle PWM audio signal and then converting the PWM signal into an analog audio signal;
the power amplification module is used for amplifying the power of the analog audio signal and driving a loudspeaker to sound;
the loudspeaker receives the analog audio signal of the power amplification module to sound.
2. The low-speed driving prompt tone system according to claim 1, wherein the vehicle-mounted MCU is used as a controller for receiving the speed, gear signal and power state signal of the whole vehicle, and outputting the audio to the low-speed driving prompt tone speaker assembly through the PWM OUT channel in a PWM format when the sounding condition of the low-speed driving prompt tone is satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121311028.9U CN216034079U (en) | 2021-06-11 | 2021-06-11 | Low-speed driving prompting sound system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121311028.9U CN216034079U (en) | 2021-06-11 | 2021-06-11 | Low-speed driving prompting sound system |
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| Publication Number | Publication Date |
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| CN216034079U true CN216034079U (en) | 2022-03-15 |
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| CN202121311028.9U Active CN216034079U (en) | 2021-06-11 | 2021-06-11 | Low-speed driving prompting sound system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114598971A (en) * | 2022-03-17 | 2022-06-07 | 重庆长安汽车股份有限公司 | AVAS module and driving system and method of loudspeaker |
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2021
- 2021-06-11 CN CN202121311028.9U patent/CN216034079U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114598971A (en) * | 2022-03-17 | 2022-06-07 | 重庆长安汽车股份有限公司 | AVAS module and driving system and method of loudspeaker |
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Address after: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee after: Deep Blue Automotive Technology Co.,Ltd. Address before: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee before: CHONGQING CHANGAN NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |
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