Search

CN-122002184-A - Self-adaptive volume control method for commercial vehicle

CN122002184ACN 122002184 ACN122002184 ACN 122002184ACN-122002184-A

Abstract

The invention discloses a self-adaptive volume control method for a commercial vehicle, and belongs to the technical field of vehicle electronics. The method realizes the volume self-adaptive adjustment based on real-time environmental noise by constructing a hardware system comprising a microcontroller, an audio processing module and an environmental noise detection module and running a multitask software system on the microcontroller. The environmental noise detection merges two modes of direct acquisition by a microphone and indirect analysis by a non-microphone (through the difference of back electromotive force of a loudspeaker). The system respectively executes the self-adaptive volume control logic of the external horn, the integral horn in the vehicle and the local horn in the vehicle according to the preset threshold value and the coefficient. The invention can automatically adapt to different noise environments, effectively reduce the operation burden of a driver, improve the driving safety, optimize the in-car and out-car audio listening degree and comfort, and enhance the compliance of the use of the external horn.

Inventors

  • DONG DESHENG
  • LI AN

Assignees

  • 欧科佳（上海）汽车电子设备有限公司

Dates

Publication Date
20260508
Application Date
20260130

Claims (10)

  1. 1. A method for adaptive volume control of a commercial vehicle, the method being implemented on the basis of a platform comprising a hardware system and a software system running thereon, comprising the steps of: step S1, constructing a basic hardware system, wherein the hardware system at least comprises: the micro control unit MCU is used as a core controller; the power management module supplies power to each component of the system and is managed by the MCU; the parameter storage component is used for storing system control parameters; the signal identification module is used for identifying the state of the external function switch; the audio processing module comprises an audio isolation and distribution unit and an audio power amplifier, wherein the audio isolation and distribution unit is used for receiving an original audio input and performing isolation and distribution on the original audio input to form an internal reference sound source and an external driving sound source; the environment noise detection module is used for collecting vehicle environment noise signals; S2, configuring system parameters, and presetting control parameters including an environmental noise upper limit value, an environmental noise lower limit value, a high-noise volume control coefficient and a low-noise volume control coefficient in the parameter storage component; S3, constructing and running a software system on the MCU, and creating and scheduling a plurality of software tasks including a system task, an IO task, an environmental noise detection task, an external horn control task and an internal horn control task; Step S4, based on the state of the function switch and the detection result of the environmental noise, executing the self-adaptive volume control logic, wherein the self-adaptive volume control logic comprises the following steps: When the self-adaptive function outside the vehicle is started, dynamically adjusting the output volume of the external horn when the driver triggers the external horn according to the real-time detected external environment noise value; when the integral self-adaptive function in the vehicle is started, dynamically adjusting the integral output volume of all the vehicle loudspeakers according to the real-time detected noise value of the integral environment in the vehicle; When the local self-adaptive function in the vehicle is started, the output volume of the horn in the vehicle in the appointed area is independently and dynamically adjusted according to the environmental noise value of the appointed area in the vehicle detected in real time.
  2. 2. The adaptive volume control method of a commercial vehicle of claim 1, wherein the ambient noise detection module is configured to perform ambient noise collection in at least one of the following forms: A) A microphone form of directly collecting sound pressure signals through one or more microphones arranged at specific positions inside and outside the vehicle; b) And in a non-microphone form, extracting a signal component caused by ambient noise by analyzing the difference between an expected electric signal driving the external horn and an electric signal actually acquired from the external horn circuit by using the audio processing module and the external horn, and calculating the ambient noise intensity according to the signal component.
  3. 3. The method for adaptive volume control of a commercial vehicle according to claim 2, wherein the ambient noise detection in the form of a non-microphone specifically comprises: Acquiring an internal reference sound source signal generated by the audio frequency isolation distribution unit and used for driving an external loudspeaker of the vehicle; collecting actual voltage and/or current signals in an external horn loop; Removing expected driving components related to the internal reference sound source signals from the actual voltage and/or current signals through a signal processing algorithm to obtain residual noise signals; And calculating to obtain an equivalent vehicle exterior environment noise value according to the amplitude or energy of the residual noise signal through a pre-calibrated mapping relation.
  4. 4. The method for adaptive volume control of a commercial vehicle according to claim 1, wherein the external horn adaptive volume control logic specifically comprises: continuously monitoring the noise value outside the vehicle; When the driver triggering the operation of the external horn of the vehicle is detected, judging the relation between the current external noise value of the vehicle and a preset threshold value: if the environmental noise value outside the vehicle is less than or equal to the environmental noise lower limit value, controlling the audio power amplifier to output with a first gain coefficient, wherein the first gain coefficient is related to the low-noise volume control coefficient; If the environmental noise value outside the vehicle is more than or equal to the environmental noise upper limit value, controlling the audio power amplifier to output in a second gain coefficient, wherein the second gain coefficient is related to the high-noise volume control coefficient; if the environmental noise value outside the vehicle is between the lower limit value and the upper limit value of the environmental noise, calculating and controlling the audio power amplifier to output in a corresponding intermediate gain coefficient based on a mapping function.
  5. 5. The adaptive volume control method of a commercial vehicle according to claim 1, wherein the in-vehicle integral horn adaptive volume control logic specifically comprises: continuously monitoring the noise value of the whole environment in the vehicle; According to the relation between the overall environmental noise value in the vehicle and a preset threshold value, dynamically calculating the target total gain: if the overall environmental noise value in the vehicle is less than or equal to the environmental noise lower limit value, determining the target total gain based on the low-noise volume control coefficient; if the overall environmental noise value in the vehicle is more than or equal to the environmental noise upper limit value, determining the target total gain based on the high-noise volume control coefficient; The target total gain is applied to the audio power amplifier or its primary volume control that drives all in-car horns.
  6. 6. The method for controlling the adaptive volume of a commercial vehicle according to claim 1, wherein the logic for controlling the adaptive volume of the local horn in the vehicle specifically comprises: continuously monitoring an environmental noise value of at least one designated area in the vehicle; for each region with local self-adaptation starting, independently calculating a target region gain corresponding to the region according to the relation between the environmental noise value and a preset threshold value; And only the target region gain calculated by each region is respectively applied to the independent audio power amplifier channels for driving the corresponding region loudspeaker.
  7. 7. The method of adaptive volume control for a commercial vehicle of claim 1, further comprising compounding control logic: When the in-vehicle integral adaptive function and at least one in-vehicle local adaptive function are simultaneously turned on, the final output gain of the horn is determined by both the integral gain calculated based on the integral noise and the local gain calculated based on the local noise for the area under local adaptive control.
  8. 8. The method for controlling the adaptive volume of a commercial vehicle according to claim 1, wherein the external function switch identified by the signal identification module at least comprises a switch for turning on or off an external horn adaptive function, a switch for turning on or off an internal overall horn adaptive function, and a switch for turning on or off an internal horn adaptive function in a specific area.
  9. 9. The method of claim 1, wherein the system control parameters stored in the parameter storage unit further comprise an external horn base gain, an internal horn overall base gain, a horn base gain for each region, a noise detection filter parameter, and a volume adjustment response speed parameter.
  10. 10. A system for implementing the adaptive volume control method for a commercial vehicle as claimed in any one of claims 1 to 9, comprising: A hardware system entity as defined in step S1 of claim 1; A non-transitory computer readable storage medium storing an executable program that, when executed by the MCU, implements software task construction, scheduling, and adaptive volume control logic as set forth in steps S3 and S4 of claim 1.

Description

Self-adaptive volume control method for commercial vehicle Technical Field The invention relates to the technical field of vehicle electronics, in particular to a self-adaptive volume control method of a commercial vehicle, and in particular relates to a vehicle-mounted audio control system of the commercial vehicle and an environment sensing and self-adaptive control technology. More particularly, the invention relates to a self-adaptive control method and a self-adaptive control system based on a Microcontroller (MCU) and capable of automatically adjusting the output volume of an external warning horn and an internal multimedia horn (including whole and local) by detecting the noise level of the interior and the exterior of a vehicle, so as to improve the driving safety, passenger riding experience and compliance and effectiveness of horn use of a commercial vehicle. Background With rapid development of automotive electronics, in-vehicle infotainment systems, advanced Driving Assistance Systems (ADAS), etc. have become key to improving the level of vehicle intelligence and driving experience. In the field of commercial vehicles, unique requirements are put forward for the control of an audio system due to the characteristics of complex operation scene, large space in the vehicle, multiple noise sources and the like. At present, commercial vehicles are generally equipped with two main types of horns, namely an external horn (such as an air horn and an electric horn) which are mainly used for sending warning signals to pedestrians or other vehicles, and an internal horn which is used for playing multimedia audio (such as music and navigation prompts) or internal communication. The volume control of these two horns has the following pain points: 1. The problem of volume control of the external horn is that the traditional external horn usually has no or only limited manual volume adjusting function, and the design volume is generally higher, so that the external horn can be effectively identified in a noisy environment. However, this is prone to noise pollution in low noise environments (e.g., residential areas, hospital vicinity, night roads), and even violations of noise regulations in the relevant areas. Particularly in urban congested road sections, when a mild alert to pedestrians or vehicles in front is required, a high volume horn is not only unnecessary, but may also cause panic or countermeasures. Often, drivers cannot or are not convenient to switch horn modes or adjust volume manually frequently during driving, which results in inconvenience in use and potential compliance risks. 2. The volume of the multimedia system in the vehicle is usually manually adjusted by a driver through a central control panel, a knob or a steering wheel key. Commercial vehicles travel in a complex and diverse road condition, such as from a quiet multiple road to a noisy highway or from daytime to nighttime where silence is desired. The drastic change in ambient noise requires a corresponding adjustment in volume to ensure that the audio content (e.g., navigation instructions, communication information) is clearly heard. However, during driving, especially long distance driving or under complex road conditions, the main attention of the driver must be focused on road safety, and frequent distraction of volume adjustment operations increases safety risks. In addition, the commercial vehicle cab and the cabin space are large, and the noise level difference of different positions is obvious. For example, the ambient noise may be much higher in areas near the engine compartment, near the open windows, near the air outlets of the air conditioner, and near the rear of the vehicle near the cargo or equipment. With a uniform volume output, passengers in high noise areas may not hear the sound clearly, while passengers in low noise areas feel the sound too loud. Although some high-end vehicle types support zone volume control, most of them are static manual setting, and cannot dynamically respond to real-time changes of environmental noise at different positions in the running state of the vehicle. 3. The limitation of the existing automatic volume control technology is that the automatic volume control technology is already applied to consumer electronic products (such as intelligent headphones and intelligent mobile phones) and part of passenger cars. For example, noise reduction headphones counteract noise by actively capturing ambient noise and generating anti-phase sound waves, some passenger vehicles have a "speed-dependent volume adjustment" function, i.e., the volume increases slightly as vehicle speed increases, and some vehicles have simple scenerising logic such as "open door reduce volume". However, these technologies are primarily directed to relatively simple, uniform acoustic environments for personal devices or passenger vehicles. For commercial vehicles, the application scene is more complex, namely, two complet