WO2018166296A1 - Warning sound producer for new energy vehicle - Google Patents

Abstract

A warning sound producer for a new energy vehicle, comprising an MCU module (11), a CAN communication module (16), a DA module (12), a power amplifier module (13), and a loudspeaker (14). The MCU module (11) generates a PWM signal having a square wave and sends the PWM signal to the power amplifier module (13) for volume adjustment. The MCU module (11) sends sound data to the DA module (12) and sends a working time reference signal to the DA module (12) for audio control. The DA module (12) generates an audio signal on the basis of the sound data and the working time reference signal, and sends the audio signal to the power amplifier module (13). The warning sound producer for a new energy vehicle resolves the problem of increase in system costs due to necessary dependence on a voice chip, and enhances the anti-interference capability in a CAN communication process. Moreover, the volume and tone can be adjusted in real time according to the state of the vehicle, the warning effect is good, and sound pollution to the external environment can be decreased.

Description

Warning tone generator for a new energy vehicle Technical field

The invention relates to the technical field of sound alarms, in particular to a warning sound generator of a new energy vehicle.

Background technique

In modern society, cars have become an indispensable tool in people's lives. Private cars and buses are convenient for people to travel. Cars are replacing bicycles as an important means of transportation in people's lives. In recent years, with the increasing global air pollution, countries are paying more and more attention to environmental protection and air pollution prevention and treatment. Vehicle exhaust emissions are considered to be one of the main sources of air pollution. A new energy vehicle is a vehicle with advanced technology, new technology and new structure, which uses unconventional vehicle fuel as a power source or uses conventional vehicle fuel and adopts a new vehicle power device. The new energy vehicle is driven by a new type of engine. The sound it emits is very small and is overwhelmed by environmental noise. This causes the car to be in a “quiet state”, that is, the sound of the new energy vehicle is small during the driving process and is not easily found by pedestrians. It is easy to cause traffic accidents. At present, the warning sound generator of the new energy vehicle uses a voice chip to complete the introduction of sound files, sound sorting storage, sound playback, sound volume and the like. In the process of sound emission, the voice chip is required to participate in the sounding. The voice chip performs the adjustment of the volume and the audio to output the sound, and then the speaker is driven by the power amplifier. The voice chip is expensive, and the hardware cost is increased due to the dependence on the voice chip.

Summary of the invention

In view of this, one technical problem to be solved by the present invention is to provide a warning sound generator for a new energy vehicle, which can effectively solve the above problems.

According to an aspect of the present invention, a warning sound generator for a new energy vehicle is provided, comprising: an MCU module, a CAN communication module, a DA module, a power amplifier module, and a speaker; and the MCU module passes the CAN communication module and the new energy vehicle The control device is connected; the MCU module is respectively connected to the DA module and the power amplifier module; the power amplifier module is respectively connected to the DA module and the speaker; and the MCU module generates a PWM signal with a square wave and Sending to the power amplifier module, the PWM signal is used for volume adjustment; the MCU module sends sound data to the DA module, and sends a working time reference signal to the DA module, where the working time reference signal is used Performing audio control; the DA module generates an audio signal based on the sound data and the working time reference signal and transmits the audio signal to the power amplifier module.

Optionally, the method includes: a power module; the power module is respectively connected to the MCU module, the CAN communication module, the DA module, and the power amplifier module.

Optionally, the method further includes: a storage module; the storage module is electrically connected to the MCU module; and the MCU module converts the received sound file into an audio array, and is stored in the storage module.

Optionally, the method further includes: obtaining, by the MCU module, a status signal from a control device of a new energy vehicle by using the CAN communication module, where the status signal includes: a brake signal, an acceleration signal, a motor speed, and a vehicle speed signal; the MCU module is based on The status signal selects a corresponding sound array from the storage module and sends the same to the DA module.

Optionally, the method further includes: an infrared detecting module; the MCU module and the infrared detecting module are electrically connected; the infrared detecting module detects whether a person is around the vehicle and outputs an infrared detecting signal, and the MCU module receives the infrared detecting And generating, according to the infrared detection signal, the PWM signal and the working time reference signal, and selecting a corresponding sound array from the storage module and transmitting the same to the DA module.

Optionally, the method further includes: a GPS module; the GPS module is electrically connected to the MCU module; the GPS module sends a vehicle speed and time signal to the MCU module; an environmental signal acquisition module; the MCU module and the environment The signal acquisition module is electrically connected; the environmental signal acquisition module collects the sound pressure signal of the external environment sound in real time and sends the sound pressure signal to the MCU module.

Optionally, the MCU module receives the speed signal sent by the GPS module in real time; when the vehicle speed meets the alarm threshold, the MCU module obtains the time signal and the location from the GPS module and the environmental signal acquisition module, respectively. The sound pressure signal is generated, and the PWM signal and the working time reference signal are generated according to the time signal and the sound pressure signal, and a corresponding sound array is selected from the storage module and sent to the DA module.

Optionally, the MCU module separately acquires the time signal and the sound pressure signal from the GPS module and the environmental signal acquisition module, and analyzes the time signal and the sound pressure signal; When the volume needs to be lowered, the MCU module adjusts the volume and audio of the speaker playback by adjusting the PWM signal and the working time reference signal.

Optionally, a first RC shaping circuit module is disposed between the MCU module and the power amplifier module; the PWM signal sent by the MCU module is shaped by the first RC shaping circuit module and sent to the The power amplifier module.

Optionally, a second RC shaping circuit module is disposed between the DA module and the power amplifier module, and the audio signal sent by the DA module is shaped by the second RC shaping circuit module and sent to the The power amplifier module.

The warning sound generator of the new energy vehicle of the invention transmits the PWM signal to the power amplifier module for volume adjustment, sends the sound data to the DA module to generate an audio signal, and sends the clock reference signal to the DA module for audio control, thereby solving the necessity of relying on Voice chips increase the cost of the system.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is merely some embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without any inventive labor.

1 is a block diagram showing the structure of an embodiment of a warning sound generator of a new energy vehicle of the present invention;

2 is a block diagram showing another embodiment of a warning sound generator of a new energy vehicle of the present invention;

Fig. 3 is a circuit diagram showing an RC shaping circuit module of an embodiment of a warning tone generator of a new energy vehicle of the present invention.

detailed description

The invention is described more fully hereinafter with reference to the accompanying drawings The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. The technical solutions of the present invention are described in various aspects in conjunction with the drawings and the embodiments.

Hereinafter, "first", "second", etc. are distinguished from the description, and have no other special meaning.

As shown in FIG. 1 and FIG. 2, the present invention provides a warning sound generator for a new energy vehicle, comprising: an MCU module 11, a CAN communication module 16, a DA module 12, a power amplifier module 13, and a speaker 14. The DA module 12 is a digital-to-analog conversion module. The MCU module 11 is connected to the control device of the new energy vehicle through the CAN communication module 16, and the MCU module 11 is connected to the DA module 12 and the power amplifier module 13, respectively. The power amplifier module 13 is connected to the DA module 12 and the speaker 14, respectively, and the MCU module 11 and the DA module 12 can be connected via an SPI serial bus or the like.

The MCU module 11 generates a PWM signal having a square wave and transmits it to the power amplifier module 13, which is used for volume adjustment. The MCU module 11 sends the sound data to the DA module 12, and sends a working time reference signal to the DA module 12. The working time reference signal is used to provide the clock frequency signal to the DA module 12, and the working time reference signal can be a square wave signal for audio. control.

For example, the DA module 12 can have a clock input, and the frequency output pin of the MCU module 11 sends a working time reference signal to the clock input. The DA module 12 generates an audio signal based on the sound data and the working time reference signal and transmits it to the power amplifier module 13, and the power amplifier module 13 drives the speaker 14 to play the audio signal. The power module 18 is connected to the MCU module 11, the CAN communication module 16, the DA module 12, the power amplifier module 13, the CAN peripheral module 17, and the like, respectively, to provide power.

The warning sound generator of the new energy vehicle in the above embodiment has a volume and audio adjustment function. The power amplifier module 13 includes a power amplifier chip, and the MCU module 11 controls the power volume control pin of the power amplifier chip to control the volume of the alarm sound generator. The volume control mode of the warning tone generator is PWM mode, and the PWM mode is in the power amplifier chip presentation mode is the level of the DC voltage, and the higher the duty ratio, the higher the voltage.

The volume adjustment adopts PWM mode to control the analog voltage output of the power output control pin of the power amplifier chip, and the resolution can reach 65536 gear positions. The square wave signal of the PWM signal is generated and generates an approximate DC level through the RC shaping circuit module. Similar to the “potentiometer knob” voltage regulation method, a subdivision voltage of 1/65535 can be generated.

The audio adjustment of the warning tone generator is the adjustment of the sound output frequency, that is, the speed at which the sound is played. The clock of the DA module 12 employs an externally input square wave signal, and the MCU module 11 controls the speed of sound playback of the speaker 14 by controlling the frequency of the working time reference signal (square wave signal).

The anti-interference ability is improved in the CAN communication hardware system and the design scheme for the possible effective mode is reserved. The MCU module 11 converts the sound file into an audio array and sends it to the DA module 12 for playback. The volume of the playback is controlled by the PWM control pin of the MCU module 11 to control the power amplifier chip, and the played audio signal is output to the DA through the MCU module 11 The system clock pin of module 12 is controlled.

The warning sound generator of the new energy vehicle in the above embodiment does not use a special voice decoding chip, but uses software to decode the voice file to form a sound array, according to the data corresponding to the sound group, according to a certain time interval, through the CPU The DA pushes the voltage corresponding to the sound group data to the power amplifier module, thereby driving the speaker to emit a corresponding sound.

The warning sound generator of the new energy vehicle in the above embodiment solves the problem that the original warning tone generator must rely on the proprietary voice chip and increases the system cost, and the sound output mode adopts the DA conversion mode instead of the traditional PWM mode. The audio uses MUC's programmable square wave control, which can control 65,536 levels, which solves the problem that the original playback adjustment easily causes frequency jumps and frustration.

The storage module 15 is electrically connected to the MCU module 11, and the MCU module 11 converts the received sound file into an audio array and stores it in the storage module 15. The MCU module 11 converts the sound file into a WAV format through a sound software, and the sampling rate is 8k or 16k, and the sound file is converted into a corresponding array identifiable by the system. After the array is completed (16bit), the chip is not powered down. in. The storage module 15 or the MCU module 11 sends an array to the DA module 12, and the DA module 12 emits a preset warning tone by outputting a voltage signal corresponding to the sound group.

The sound file will form a disordered waveform of multiple harmonics. This harmonic forms a sound corresponding array in a discrete manner according to a sampling rate at a certain time, which is referred to as a sound group. The MCU module 11 converts the sound file into a WAV format through a sound software, and the sampling rate is 8k or 16k, and the sound file is converted into a corresponding sound group.

The files formed by the sound group tend to be larger and better. The sampling rate is especially important. If the sampling rate is too high, the array is too large to be easily stored in the system. The sound generated by the sampling rate is too low. After the sound group and the sampling rate are confirmed, the corresponding number of the sound group is completed, and the corresponding correspondence between the sound group data and the voltage signal is completed after the linear coefficient is completed, and then played by the DA function foot of the CPU at a certain time interval.

The MCU module 11 acquires a status signal from the control device of the new energy vehicle through the CAN communication module 16, and the status signals include: a brake signal, an acceleration signal, a motor speed, and a vehicle speed signal. The MCU module 11 selects a corresponding sound array from the storage module 15 based on the status signal and transmits it to the DA module 12. For example, selecting an array of sounds corresponding to the sound of the car engine for processing and playback can simulate different sounds of the engine when the car is at 40 km and 80 km/h.

The MCU module 11 and the infrared detecting module 21 are electrically connected. The infrared detecting module 21 detects whether there is a person around the vehicle and outputs an infrared detecting signal, and the MCU module 11 receives the infrared detecting signal and generates a PWM signal and a working time reference signal according to the infrared detecting signal, and selects a corresponding sound array from the storage module and sends the same to the sound module. DA module 12.

For example, the front of the vehicle is equipped with an infrared detection module, and the infrared detection module has an infrared probe interface. The detection head based on the pyroelectric sensor can detect whether there is a pedestrian passing by detecting the strength of the signal of the human body characteristic infrared band 10um, and output infrared detection. signal. Once a pedestrian has a receiving range of the pyroelectric sensor, the pyroelectric will generate a corresponding voltage signal, that is, an infrared detecting signal, and the voltage signal is denoised and purified by the filtering circuit, and sent to the AD collecting part to collect the pyroelectric power. The incoming analog signal is converted into a digital signal, and the digital signal enters the MCU module 11, thereby judging that a pedestrian appears in front and the control emits a warning tone.

The GPS module 22 is electrically coupled to the MCU module 11, and the GPS module 22 transmits vehicle speed and time signals to the MCU module 11. The MCU module 11 and the environmental signal acquisition module 23 are electrically connected, and the ambient signal acquisition module 23 collects the sound pressure signal of the external environment sound in real time and sends it to the MCU module.

The MCU module 11 receives the speed signal sent by the GPS module 22 in real time. When the vehicle speed meets the alarm threshold, the MCU module 11 acquires the time signal and the sound pressure signal from the GPS module 22 and the environmental signal acquisition module 23, respectively, and generates the time signal and the sound pressure signal according to the time signal and the sound pressure signal. The PWM signal and the working time reference signal are selected from the storage module 15 and sent to the DA module 12.

The MCU module 11 acquires a time signal and a sound pressure signal from the GPS module 22 and the environmental signal acquisition module 23, respectively, and analyzes the time signal and the sound pressure signal. When it is judged that the volume needs to be lowered, the MCU module 11 adjusts the volume and audio played by the speaker 14 by adjusting the PWM signal and the working time reference signal.

The MCU module 11 can judge whether the surrounding sound is noisy by the sound pressure signal of the external environment sound. If the surrounding noise is high or the decibel is high, the volume is increased. If the surrounding is very quiet or the decibel is small, the volume is reduced, and the disturbance can be avoided. . The MCU module 11 can monitor the sound pressure level of the environment in real time, and determine the sound pressure level to be emitted by the new energy vehicle pedestrian sound warning device according to the surrounding sound pressure level, and then emit a small sound when the average sound pressure level is small. The pressure value can complete the pedestrian warning function.

The MCU module 11 can avoid the pedestrian warning being issued passively, and control the playing volume according to the dynamic pressure feedback of the environment in which the vehicle is traveling. For example, the noise can be appropriately increased at a noisy intersection, and the quiet cell can be appropriately adjusted at night. Low volume, equipped with infrared detection to detect the presence of pedestrians, if a pedestrian is detected, a warning tone is sounded, otherwise a warning tone is stopped. The MCU module 11 analyzes the received time signal and the external noise signal. For example, whether the noise is large or small at night or during the day, the volume of the playback is determined according to time and external noise.

For example, the MCU module 11 receives the speed signal sent by the GPS module 22 in real time. When the vehicle speed meets the alarm threshold, that is, when the vehicle speed has fallen below the set vehicle speed threshold, for example, the vehicle speed is greater than 0 and less than 30 km/hour, the MCU module 11 respectively The GPS module 22 and the environmental signal acquisition module 23 acquire time information and external noise information, and determine the volume and audio of the played sound based on the time information and the external noise information. When it is judged that the volume needs to be lowered, for example, the external noise becomes low or the time is later, the volume, audio, and the like of the played sound are lowered.

The MC33901 series chip is used in the CAN communication module 16. The MC33901 series chip is the latest CAN chip from Freescale. Anti-common mode interference circuit and high frequency filtering circuit are adopted in the peripheral circuit of the chip. The use of the latest chips in the CAN communication module 16 removes the increased cost burden of common mode inductors.

Freescale's MC33901 family of chips is a cost-effective transceiver designed for standard CAN high-speed applications for converting digital protocol information into analog CAN communications. It provides built-in transceiver explicit timeout for automotive applications and a physical interface to the MCU. The CAN protocol controller and the physical double line of the CAN bus.

A first RC shaping circuit module is disposed between the MCU module 11 and the power amplifier module 13. The PWM signal sent by the MCU module 11 is shaped by the first RC shaping circuit module and sent to the power amplifier module 13. A second RC shaping circuit module is disposed between the DA module 12 and the power amplifier module 13. The audio signal sent by the DA module 12 is shaped by the second RC shaping circuit module and sent to the power amplifier module 13. The circuits of the first RC shaping circuit module and the first RC shaping circuit module may be the same, for example, both are RC shaping circuits as shown in FIG.

The pedestrian voice alarm device of the new energy vehicle provided by the above embodiment transmits the sound signal to the DA module by transmitting the PWM signal to the power amplifier module, and sends the clock reference signal to the DA module for audio control, thereby solving the necessity of relying on the voice. The chip increases the system cost problem, strengthens the anti-interference ability in the CAN communication process, and the volume and tone can be adjusted in real time according to the state of the car, the warning effect is good, and the sound pollution to the external environment can be reduced.

The methods and systems of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention can be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described sequence of steps for the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Moreover, in some embodiments, the invention may also be embodied as a program recorded in a recording medium, the program comprising machine readable instructions for implementing the method according to the invention. Thus, the invention also covers a recording medium storing a program for performing the method according to the invention.

Any of the above-disclosed embodiments of the present invention are intended to be within the preferred numerical range unless otherwise stated. Any person skilled in the art will understand that the preferred numerical range is only Among the many implementable values, the technical effects are obvious or representative. The present invention is not limited by the scope of the present invention, and the numerical values set forth above should not be construed as limiting the scope of the invention.

In the meantime, if the above-mentioned invention discloses or relates to components or structural members that are fixedly connected to each other, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (for example, using bolts or screws), or It is understood as: non-detachable fixed joints (such as riveting, welding), of course, the mutual fixed connection can also be replaced by a one-piece structure (for example, manufactured by integral casting process) (except that the integral forming process is obviously not available).

In addition, the terms used in any one of the above-disclosed embodiments of the present invention for indicating a positional relationship or shape include a state or shape similar to, similar to, or similar to each other unless otherwise stated. Any of the components provided by the present invention may be assembled from a plurality of separate components or may be a separate component manufactured by an integral forming process.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to be limiting; although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that The invention is not limited to the spirit of the technical solutions of the present invention, and should be included in the scope of the technical solutions claimed in the present invention.

Claims (10)

A warning sound generator for a new energy vehicle, characterized in that it comprises: MCU module, CAN communication module, DA module, power amplifier module and speaker; The MCU module is connected to a control device of a new energy vehicle through the CAN communication module; the MCU module is respectively connected to the DA module and the power amplifier module; the power amplifier module is respectively connected to the DA module and the speaker Connecting; the MCU module generates a PWM signal having a square wave for transmitting to the power amplifier module, the PWM signal is used for volume adjustment; the MCU module transmits sound data to the DA module, and to the DA The module transmits a working time reference signal for performing audio control; the DA module generates an audio signal based on the sound data and the working time reference signal and transmits the audio signal to the power amplifier module. The device of claim 1 further comprising: a power module; the power module is respectively connected to the MCU module, the CAN communication module, the DA module, and the power amplifier module. The alert tone generator of claim 1 further comprising: a storage module; the storage module is electrically connected to the MCU module; the MCU module converts the received sound file into an audio array, and stores the sound file in the storage module. The warning tone generator of claim 3, further comprising: The MCU module acquires a status signal from a control device of a new energy vehicle through the CAN communication module, where the status signal includes: a brake signal, an acceleration signal, a motor speed, and a vehicle speed signal; The MCU module selects a corresponding sound array from the storage module based on the status signal and sends the corresponding sound array to the DA module. The warning tone generator of claim 3, further comprising: An infrared detecting module; the MCU module and the infrared detecting module are electrically connected; the infrared detecting module detects whether there is a person around the vehicle and outputs an infrared detecting signal, and the MCU module receives the infrared detecting signal and according to the infrared detecting The signal generates the PWM signal and the working time reference signal, and selects a corresponding sound array from the storage module and sends the same to the DA module. The warning tone generator of claim 3, further comprising: a GPS module; the GPS module is electrically connected to the MCU module; the GPS module sends a vehicle speed and time signal to the MCU module; an environmental signal acquisition module; the MCU module and the environmental signal acquisition module are electrically connected; The ambient signal acquisition module collects the sound pressure signal of the external environment sound in real time and sends it to the MCU module. A warning tone generator according to claim 6 wherein: The MCU module receives the speed signal sent by the GPS module in real time; When the vehicle speed meets the alarm threshold, the MCU module acquires the time signal and the sound pressure signal from the GPS module and the environmental signal acquisition module, respectively, and generates the according to the time signal and the sound pressure signal. The PWM signal and the working time reference signal are selected from the storage module and sent to the DA module. The device of claim 6 wherein: The MCU module acquires the time signal and the sound pressure signal from the GPS module and the environmental signal acquisition module, respectively, and analyzes the time signal and the sound pressure signal; When it is judged that the volume needs to be lowered, the MCU module adjusts the volume and audio played by the speaker by adjusting the PWM signal and the working time reference signal. The alert tone generator of claim 1 further comprising: A first RC shaping circuit module is disposed between the MCU module and the power amplifier module; the PWM signal sent by the MCU module is shaped by the first RC shaping circuit module and sent to the power amplifier module. The alert tone generator of claim 1 further comprising: A second RC shaping circuit module is disposed between the DA module and the power amplifier module, and the audio signal sent by the DA module is shaped by the second RC shaping circuit module and sent to the power amplifier module.

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