CN105857167B - A kind of automobile electric whistle PWM control device - Google Patents
A kind of automobile electric whistle PWM control device Download PDFInfo
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- CN105857167B CN105857167B CN201610190326.4A CN201610190326A CN105857167B CN 105857167 B CN105857167 B CN 105857167B CN 201610190326 A CN201610190326 A CN 201610190326A CN 105857167 B CN105857167 B CN 105857167B
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- 230000005616 pyroelectricity Effects 0.000 description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q5/00—Arrangement or adaptation of acoustic signal devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
- H03G3/24—Control dependent upon ambient noise level or sound level
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- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Circuit For Audible Band Transducer (AREA)
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Abstract
A kind of automobile electric whistle PWM control device, comprising: single-chip microprocessor MCU, switch power amplifier, loudspeaker SP, electric whistle relay drive circuit, vehicle speed sensor, pyroelectric sensor, electric whistle button SB, selection switch S1, condition indication circuit and selection switch S1；Design is scientific and reasonable for the control device of the present invention, it is safe and reliable, the consumption of the energy and the secondary disaster of noise can be reduced under the premise of guaranteeing safe handling, also it can be reduced generally existing at present " road anger phenomenon ", play the role of certain construction harmonious society；The control device of the invention can automatically adjust control to the volume of automobile electric whistle, tone according to speed and running environment, enhance the use function of automobile, protect the health of people and environment harmonious.
Description
Technical field
The present invention relates to automobile electric whistle technical field, especially a kind of automobile electric whistle PWM control device, the device can lead to
The size of ambient enviroment and speed is crossed, to judge influence of the noise to electric whistle, optimal electric whistle volume is then confirmed, has sound
The ability that amount and tone are adjusted simultaneously, such apparatus structure is simple, design science, not only reduces the waste of electric energy, also significantly
The vehicle because increasing increasingly and congestion are improved, city bring noise secondary disaster is given, improves ecological environment, protect people
Health.
Background technique
Automobile currently on the market is provided with whistle loudspeaker, and some medium and high quality automobiles are further provided with anti-theft loudspeaker；In vapour
In vehicle driving process, driver triggers whistle loudspeaker as needed, warns pedestrian or causes other vehicles note that also can be used simultaneously
Yu Cuihang and transmitting signal etc.；
The working method of automobile electric whistle currently on the market, the existing articulation type controlled using traditional relay, is also had
Control is realized using electronic circuit, what is had can adjust volume according to environment surrounding automobile, but there is presently no occur simultaneously
It is adjusted according to environment surrounding automobile and speed vehicle condition and carries out volume adjustment, when city is run at a low speed, car horn generates high
Noise causes noise pollution, be easy to cause the damage of the scaring and organ of pedestrian, and this automobile electric whistle can also be made
At the waste of electric energy, occupied fund cost；
Automobile developed very rapidly in recent years, and noise pollution problem resulting from is also very prominent, in order to preferably say
The working principle of the bright loudspeaker of vehicle whistle in the prior art, certain existing automobile horn control device technology frame chart of now illustrating are joined
Understanding is examined, as shown in Figure 1；The device includes: probe unit, control unit, concussion unit and loudspeaker unit；The probe unit
It include: noise transducer and mark sensor；The noise transducer is used to acquire the noise of automobile position environment；It is described
Identify the road markings that sensor is used for probe vehicle position；The probe unit is used for probe vehicle position environment
Signal；Described control unit includes: processing module, current regulator and oscillator；The oscillator includes: electromagnetic coil driving
Circuit and the coil diaphragm being connected with electromagnetic coil driving circuit；One end of described control unit and the one of the probe unit
End is electrically connected, described control unit is used for according to the obtained environmental signal sent by probe unit, judges vapour with this
Vehicle local environment, and sound volume of automobile horn is adjusted according to the concrete condition of automobile local environment；The tool of the automobile local environment
Body situation further includes that while the car is driving, can identify to automobile local environment, and according to automobile local environment tune
Sound volume of automobile horn is saved, thus under the premise of meeting car horn functional requirement, it can be certainly in special time and special area
It is dynamic to reduce sound volume of automobile horn size, achieve the purpose that noise-reducing and energy saving, but the device exist one it is fatal scarce
It falls into, i.e., volume and tone cannot be adjusted simultaneously, this design defect far can not adapt to the needs of current city traffic environment.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of automobile electric whistle PWM control device, the control devices
Design science, it is safe and reliable, by ambient enviroment and the size of speed, confirms optimal electric whistle volume, reduced with this
Past reaches the mesh for reducing electricity consumption by adjusting volume using electric whistle volume caused by single electricity consumption mode
, while reducing noise bring unfavorable factor；
In order to solve the above technical problem, the present invention provides a kind of automobile electric whistle PWM control device, the control device packets
Include following structure division:
Single-chip microprocessor MCU, switch power amplifier, loudspeaker SP, electric whistle relay drive circuit, vehicle speed sensor, pyroelectricity
Sensor, electric whistle button SB, condition indication circuit and selection switch S1；
Illustrate as an example, output end output pwm pulse signal to the switch power of the single-chip microprocessor MCU is put
Big device；
Illustrate as an example, the switch power amplifier is for driving loudspeaker SP to pronounce；
Illustrate as an example, the another output of the single-chip microprocessor MCU and the electric whistle relay drive circuit
Input terminal electrical connection, the electric whistle relay drive circuit output end connection automobile on carry high pitch automobile electric whistle；
Illustrate as an example, the analog input end of the single-chip microprocessor MCU and the output of the pyroelectric sensor
End electrical connection；
Illustrate as an example, the pyroelectric sensor is pyroelectric infrared-sensing type sensor；
Illustrate as an example, the output of the counting pulse input end and the vehicle speed sensor of the single-chip microprocessor MCU
End electrical connection；
Illustrate as an example, the first switch amount input terminal of the single-chip microprocessor MCU is electrically connected with the electric whistle button SB
It connects；
Illustrate as an example, the single-chip microprocessor MCU second, third, the 4th On-off signal end and selection switch
S1 forms selecting type switching circuit structure；
Illustrate as a kind of applicating example, it is when speed is more than 40KM/ small and when there be nobody nearby and vehicle, then automatic to use
High pitch electric whistle；When neighbouring someone and Che (people and vehicle have oneself 8 meters within) and speed were lower than 40KM/ hour, then automatic use
Loudspeaker SP, to achieve the purpose that reduce noise, save electric energy；
Illustrate as a kind of applicating example, the high pitch electric whistle is using the high pitch electric automobile horn carried on current automobile；
Illustrate as a kind of applicating example, the loudspeaker SP is bass electric whistle；
Illustrate as an example, the switch power amplifier is electrically connected with the loudspeaker SP；
It can guarantee that the tone of the bass electric whistle is lower using the composite structure of bass electric whistle and switch power amplifier,
Volume is smaller, and the also capable of emitting vocal music class audible signal of the structure and voice signal；
A kind of working principle of automobile electric whistle PWM control device in order to better illustrate the present invention, now passes through preferred implementation
Example illustrates that its structure and the course of work are as follows: (referring to shown in Fig. 2)
1. circuit operation principle:
The selection switch S1 is for manually selecting audible signal type, and the electric whistle button SB is for controlling whether to issue
Audible signal；
The vehicle speed sensor is used to detect the travel speed of automobile, when design principle is when speed is more than 40Km/
Time side can enable high pitch electric whistle, select bass electric whistle automatically when speed is in 40Km or less, foundation when below speed 40KM
Pyroelectric sensor detects and selects electric whistle audible signal type, in order to avoid neighbouring pedestrian is caused to frighten；
2. scheme is implemented:
Illustrate as an example, it is the domestic brand of IC1, model that the single-chip microprocessor MCU, which selects specification, are as follows:
The single-chip microcontroller of STC15W408AS；Connection relationship and the working principle citing of the present invention is all made of STC15W408AS pin design pass
System's description；
Illustrate as an example, the bass signal is generated by single-chip microprocessor MCU, the single-chip microcontroller STC15W408AS's
It has been internally integrated: three road CCP modules, 10,8 tunnel ADC and analog comparator all the way；The single-chip microcontroller of this 20P is selected to meet this enough
The design requirement of invention；
Illustrate as an example, the purpose for selecting the domestic single-chip microcontroller is it with the advantage in price, Er Qieqi
Reliability is experiments verify that work well；
Illustrate as a kind of applicating example, the single-chip microprocessor MCU can also use PIC16F873A single-chip microcontroller, such specification
Single-chip microcontroller experiments verify that equally can satisfy requirement；
The PIC16F873A single-chip microcontroller includes 5 channel ADC, and two CCP modules can easily export two-way PWM letter
Number, high reliablity, price compares after cost performance and time to select it；
Illustrate as an example, the condition indication circuit include: resistance R14, R15 and Light-Emitting Diode LED1,
LED2, when using high pitch electric whistle, LED1 lights luminous；When using bass electric whistle, LED2 lights luminous；
Illustrate as a kind of applicating example, in order to obtain more intuitive effect, the LED1 and LED2 select the face that shines
The different light emitting diode of color；
Illustrate as a kind of applicating example, the current limliting electricity of described R15, R14 as the Light-Emitting Diode LED1 and LED2
Resistance；
Illustrate as an example, the vehicle speed sensor output pulse signal is connect by the P3.4 of the single-chip microprocessor MCU
Mouth access counting input end, for detecting automobile travel speed, and the pulse number detected by each second, to judge automobile
Travel speed；
Illustrate as an example, the output signal of the pyroelectric sensor is added to described after integrated transporting discharging amplifies
The P1.0 mouth of single-chip microcontroller completes ADC conversion, for determining the environment of surrounding people and its vehicle inside the single-chip microprocessor MCU
Situation, single-chip microprocessor MCU determine therefrom that pronunciation type and volume height；
Illustrate as an example, the electric whistle button SB issues sound equipment as auto horn button, for controlling whether
Signal；
Illustrate as an example, the selection switch S1 is used for artificial selection electric whistle musical sound type；
When the digital sound bass signal of the P1.1 of single-chip microprocessor MCU mouth output PWM modulation, by the switch power
Amplifier controls the loudspeaker SP pronunciation；
Illustrate as an example, the switch power amplifier is constituted using IGBT and driving circuit；Wherein triode
V2, V3, V4 and resistance R13, R18 constitute driving circuit；When P1.1 foot exports low level, V2, V4 cut-off, V3 saturation
Conducting, 14V power supply apply high level to the grid of IGBT through capacitor C9, make its saturation conduction；As the P1.1 of the single-chip microprocessor MCU
When foot exports high level, triode V2, V4 saturation conduction, V3 ends, and capacitor C9 discharges by V3, applies to the grid of IGBT
Negative pulse is added to turn off it rapidly, wherein resistance R13 is used for the control of triode V2 base current, and resistance R18 provides capacitor C9
Discharge path；
Illustrating as a kind of applicating example, the switching speed (modulating frequency) of the IGBT has reached 100KHz/S, and
And it is middle bass specification that existing automobile, which provides loudspeaker for oneself, such switch modulation frequency is sufficient for design requirement；
Illustrate as an example, the P1.6 mouth of the single-chip microprocessor MCU is used for output switch control signal, with the electric whistle
Relay drive circuit electrical connection；
Illustrate as an example, the electric whistle relay drive circuit includes: relay J, diode D3, resistance R14
It is grounded with the emitter of triode V1, the triode V1；The connection of this structure can be very good to complete to drive former vehicle electric whistle relay
Device steady operation controls former automobile electric whistle and issues high pitched signal；
The pwm signal of the P1.1 mouth output of the single-chip microprocessor MCU includes two kinds of control actions:
1. the height of volume can be controlled using PWM method；
2. the height of tone can also be realized by PWM modulation；
Illustrate as an example, the modulating wave duty ratio for changing the pwm signal can be taken to realize the height of volume
Low control, this is realized by controlling the average value of duty ratio；
Illustrate as an example, the control duty ratio can be changed according to certain rule, may be implemented in this way
The high frequency modulated of acoustic signal, in a sense, switch power amplifier can be called, than common analog signal power
Amplifier has higher efficiency, while reducing requirement of the power module to heat dissipation；
Illustrate as an example, the pyroelectric sensor includes: pyroelectricity detection device DS, Fresnel Lenses, collection
At amplifier A1, A2, resistance R2 to R11；Capacitor C1 to C6；Diode D2；
Illustrate as an example, lens are installed before the DS；
Illustrate as an example, the lens are Fresnel Lenses；
Wherein, the A1 and resistance R6, R9, R3, R4 and capacitor C6 etc. constitute reverse phase proportional amplifier；The A2 and resistance
R7, R9, R10, R11 and capacitor C6 etc. constitute reverse phase proportional amplifier；Described R2, R3, R6, R8, capacitor C4 constitute second level side
To proportional amplifier；Described C2, C5 are crosslinking capacitors, and C4, C6 are alternating current bypass capacitors；
Illustrating as an example, described D2, C1 constitute detecting circuit, once vehicle nearby has pedestrian or vehicle to walk
It crosses, the P1.0 pin current potential of the single-chip microprocessor MCU increases, then is converted into digital signal by its internal A/D converter circuit；Work as number
Value uses bass electric whistle (loudspeaker SP) sending volume appropriate more than selection after setting value, the lower note signal of tone；
Advantageous effects of the invention:
1. design is scientific and reasonable for the control device of the present invention, safe and reliable, can under the premise of guaranteeing safe handling,
The consumption of the energy and the secondary disaster of noise are reduced, generally existing at present " road anger phenomenon " is also can be reduced, plays certain
Build the effect of harmonious society；
2. the control device of the invention can carry out the volume of automobile electric whistle, tone according to speed and running environment automatic
Control is adjusted, the use function of automobile is enhanced, protects the health of people and link harmonious；
Detailed description of the invention
Fig. 1 is the principle schematic diagram of the existing control technology of automobile electric whistle (CN201342510) of the present invention
Fig. 2 is a kind of theory structure schematic diagram of automobile electric whistle PWM control device of the present invention
Fig. 3 is a kind of particular circuit configurations connection figure of the preferred embodiment of automobile electric whistle PWM control device of the present invention
Fig. 4 is a kind of automobile electric whistle PWM control device of the present invention using another specification single-chip microcontroller (PIC16F873A)
Experiment simulation schematic diagram can achieve the desired results by emulation testing
Specific embodiment
With reference to the accompanying drawing to a preferred embodiment of the present invention will be described in detail.
Referring to Figure 2 to Figure 4, a kind of automobile electric whistle PWM control device, the control device comprise the following structure part:
Single-chip microprocessor MCU 101, switch power amplifier 102, loudspeaker SP103, electric whistle relay drive circuit 104, speed pass
Sensor 105, pyroelectric sensor 106, electric whistle button SB107, selection switch S1108 and condition indication circuit 109；
Illustrate as an example, an output end of the single-chip microprocessor MCU 101 exports pwm pulse signal to switching function
Rate amplifier 102；
Illustrate as an example, the switch power amplifier 102 is for driving loudspeaker SP103 to pronounce；
Illustrate as an example, the another output of the single-chip microprocessor MCU 101 and electric whistle relay driving electricity
The input terminal on road 104 is electrically connected, the high pitch automobile carried on the output end connection automobile of the electric whistle relay drive circuit 104
Electric whistle；
Illustrate as an example, the analog input end of the single-chip microprocessor MCU 101 and the pyroelectric sensor 106
Output end electrical connection；
Illustrate as an example, the pyroelectric sensor 106 is pyroelectric infrared-sensing type sensor；
Illustrate as an example, the counting pulse input end of the single-chip microprocessor MCU 101 and the vehicle speed sensor 105
Output end electrical connection；
Illustrate as an example, the first switch amount input terminal of the single-chip microprocessor MCU 101 and the electric whistle button
SB107 electrical connection；
Illustrate as an example, the single-chip microprocessor MCU 101 second, third, the 4th On-off signal end and selection open
It closes S1108 and forms selecting type switching circuit structure；
Illustrate as a kind of applicating example, it is when speed is more than 40KM/ small and when there be nobody nearby and vehicle, then automatic to use
High pitch electric whistle；When neighbouring someone and Che (people and vehicle have oneself 8 meters within) and speed were lower than 40KM/ hour, then automatic use
Loudspeaker SP, to achieve the purpose that reduce noise, save electric energy；
Illustrate as a kind of applicating example, the high pitch electric whistle is using the high pitch electric automobile horn carried on current automobile；
Illustrate as a kind of applicating example, the loudspeaker SP103 is bass electric whistle；
Illustrate as an example, the switch power amplifier 102 is electrically connected with the loudspeaker SP103；
Using the composite structure of bass electric whistle and switch power amplifier 102 can guarantee the tone of the bass electric whistle compared with
Low, volume is smaller, and the also capable of emitting vocal music class audible signal of the structure and voice signal；
A kind of working principle of automobile electric whistle PWM control device in order to better illustrate the present invention, now passes through preferred implementation
Example illustrates that its structure and the course of work are as follows: (referring to shown in Fig. 2)
1. circuit operation principle:
For manually selecting audible signal type, the electric whistle button SB107 is used to control is the selection switch S1108
No sending audible signal；
The vehicle speed sensor 105 is used to detect the travel speed of automobile, and design principle is when speed is more than 40Km/
When side can enable high pitch electric whistle, select bass electric whistle automatically when speed is in 40Km or less, when below speed 40KM according to
Electric whistle audible signal type is detected and selected according to pyroelectric sensor 106, in order to avoid neighbouring pedestrian is caused to frighten；
2. scheme is implemented:
Illustrate as an example, it is the domestic brand of IC1, model that the single-chip microprocessor MCU 101, which selects specification, are as follows:
The single-chip microcontroller of STC15W408AS；
Illustrate as an example, the bass signal is generated by single-chip microprocessor MCU 101, the single-chip microcontroller STC15W408AS
Be internally integrated: three road CCP modules, 10,8 tunnel ADC and analog comparator all the way；The single-chip microcontroller of this 20P is selected to meet enough
Design requirement of the invention；
Illustrate as an example, the purpose for selecting the domestic single-chip microcontroller is it with the advantage in price, Er Qieqi
Reliability is experiments verify that work well；
Illustrate as a kind of applicating example, the single-chip microprocessor MCU can also use PIC16F873A single-chip microcontroller, such specification
Single-chip microcontroller experiments verify that equally can satisfy requirement；
The PIC16F873A single-chip microcontroller includes 5 channel ADC, and two CCP modules can easily export two-way PWM letter
Number, high reliablity, price compares after cost performance and time to select it；
Illustrate as an example, the condition indication circuit 109 includes: resistance R14, R15 and Light-Emitting Diode
LED1, LED2, when using high pitch electric whistle, LED1 lights luminous；When using bass electric whistle, LED2 lights luminous；
Illustrate as a kind of applicating example, in order to obtain more intuitive effect, the LED1 and LED2 select the face that shines
The different light emitting diode of color；
Illustrate as a kind of applicating example, the current limliting electricity of described R15, R14 as the Light-Emitting Diode LED1 and LED2
Resistance；
Illustrate as an example, the P3.4 that 105 output pulse signal of vehicle speed sensor passes through the single-chip microprocessor MCU
Interface accesses counting input end, for detecting automobile travel speed, and the pulse number detected by each second, to judge vapour
The travel speed of vehicle；
Illustrate as an example, the output signal of the pyroelectric sensor 106 is added to after integrated transporting discharging amplifies
The P1.0 mouth of the single-chip microcontroller 101, inside the single-chip microprocessor MCU 101 complete ADC conversion, for determine surrounding people and its
The ambient conditions of vehicle, single-chip microprocessor MCU determine therefrom that pronunciation type and volume height；
Illustrate as an example, the electric whistle button SB107 issues sound as auto horn button, for controlling whether
Ring signal；
Illustrate as an example, the selection switch S1108 is used for artificial selection electric whistle musical sound type；
When the digital sound bass signal of the P1.1 mouth of the single-chip microprocessor MCU 101 output PWM modulation, by the switch
Power amplifier 102 controls the loudspeaker SP103 pronunciation；
Illustrate as an example, the switch power amplifier 102 is constituted using IGBT and driving circuit；Wherein three pole
Pipe V2, V3, V4 and resistance R13, R18 constitute driving circuit；When P1.1 foot exports low level, V2, V4 cut-off, V3 satisfies
And conducting, 14V power supply apply high level to the grid of IGBT through capacitor C9, make its saturation conduction；When the single-chip microprocessor MCU
When P1.1 foot exports high level, triode V2, V4 saturation conduction, V3 cut-off, capacitor C9 discharges by V3, to the grid of IGBT
Pole, which applies negative pulse, turns off it rapidly, and wherein resistance R13 is used for the control of triode V2 base current, and resistance R18 provides electricity
Hold the discharge path of C9；
Illustrating as a kind of applicating example, the switching speed (modulating frequency) of the IGBT has reached 100KHz/S, and
And it is middle bass specification that existing automobile, which provides loudspeaker for oneself, such switch modulation frequency is sufficient for design requirement；
Illustrate as an example, the P1.6 mouth of the single-chip microprocessor MCU 101 is used for output switch control signal, and described
Electric whistle relay drive circuit 104 is electrically connected；
Illustrate as an example, the electric whistle relay drive circuit 104 includes: relay J, diode D3, resistance
The emitter of R14 and triode V1, the triode V1 ground connection；The connection of this structure can be very good to complete to drive former vehicle electric whistle after
Electric appliance steady operation controls former automobile electric whistle and issues high pitched signal；
The pwm signal of the P1.1 mouth output of the single-chip microprocessor MCU 101 includes two kinds of control actions:
1. the height of volume can be controlled using PWM method；
2. the height of tone can also be realized by PWM modulation；
Illustrate as an example, the modulating wave duty ratio for changing the pwm signal can be taken to realize the height of volume
Low control, this is realized by controlling the average value of duty ratio；
Illustrate as an example, the control duty ratio can be changed according to certain rule, may be implemented in this way
The high frequency modulated of acoustic signal, in a sense, switch power amplifier can be called, than common analog signal power
Amplifier has higher efficiency, while reducing requirement of the power module to heat dissipation；
Illustrate as an example, the pyroelectric sensor 106 include: pyroelectricity detection device DS, Fresnel Lenses,
Integrated transporting discharging A1, A2, resistance R2 to R11；Capacitor C1 to C6；Diode D2；
Illustrate as an example, lens are installed before the DS；
Illustrate as an example, the lens are Fresnel Lenses；
Wherein, the A1 and resistance R6, R9, R3, R4 and capacitor C6 etc. constitute reverse phase proportional amplifier；The A2 and resistance
R7, R9, R10, R11 and capacitor C6 etc. constitute reverse phase proportional amplifier；Described R2, R3, R6, R8, capacitor C4 constitute second level side
To proportional amplifier；Described C2, C5 are crosslinking capacitors, and C4, C6 are alternating current bypass capacitors；
Illustrating as an example, described D2, C1 constitute detecting circuit, once vehicle nearby has pedestrian or vehicle to walk
It crosses, the P1.0 pin current potential of the single-chip microprocessor MCU increases, then is converted into digital signal by its internal A/D converter circuit；Work as number
Value uses bass electric whistle (loudspeaker SP) sending volume appropriate more than selection after setting value, the lower note signal of tone；
Design is scientific and reasonable for the control device of the present invention, safe and reliable, can be under the premise of guaranteeing safe handling, drop
The low consumption of the energy and the secondary disaster of noise also can be reduced generally existing at present " road anger phenomenon ", play certain battalion
Make the effect of harmonious society；The control device of the invention being capable of volume according to speed and running environment to automobile electric whistle, tone
Automatically adjust control, enhances the use function of automobile, protects the health of people and link harmonious；
It is above-described to be merely a preferred embodiment of the present invention, it should be understood that the explanation of above embodiments is only used
In facilitating the understanding of the method and its core concept of the invention, it is not intended to limit the scope of protection of the present invention, it is all of the invention
Any modification for being made within thought and principle, equivalent replacement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of automobile electric whistle PWM control device, which is characterized in that comprise the following structure part: single-chip microprocessor MCU, switch power
Amplifier, loudspeaker SP, electric whistle relay drive circuit, vehicle speed sensor, pyroelectric sensor, electric whistle button SB, state instruction
Circuit and selection switch S1；
One output end of the single-chip microprocessor MCU exports pwm pulse signal to switch power amplifier；The switch power amplification
Device is for driving loudspeaker SP to pronounce, the emitter ground connection of the triode V2 in the switch power amplifier, and collector is electric respectively
The ground level of connecting triode V4 and triode V3, base stage are electrically connected the P1.1 pin of the single-chip microprocessor MCU by resistance R13, and three
The emitter of pole pipe V3 and the emitter of triode V4 are brilliant by capacitor C9 electrical connection insulated gate bipolar after being electrically connected to each other
The grid of body pipe IGBT, the one end the loudspeaker SP are electrically connected the drain electrode of the insulated gate bipolar transistor IGBT, and one end passes through
The anode of the cathode of one diode D1 of circuit of three-terminal voltage-stabilizing integrated LW7805 connection, the diode D1 passes through a resistance R1
It is electrically connected the vehicle speed sensor, the drain electrode of the insulated gate bipolar transistor IGBT also passes through a diode D4 and is connected to
One power interface；
The another output of the single-chip microprocessor MCU is electrically connected with the input terminal of the electric whistle relay drive circuit, the electricity
The high pitch automobile electric whistle carried on the output end connection automobile of flute relay drive circuit；The analog quantity of the single-chip microprocessor MCU is defeated
Enter end to be electrically connected with the output end of the pyroelectric sensor；The counting pulse input end of the single-chip microprocessor MCU and the speed
The output end of sensor is electrically connected；The first switch amount input terminal of the single-chip microprocessor MCU is electrically connected with the electric whistle button SB；Institute
State single-chip microprocessor MCU second, third, the 4th On-off signal end and selection switch S1 form selecting type switching circuit structure；Institute
Switch power amplifier is stated to be electrically connected with the loudspeaker SP；The selection switch S1 is for manually selecting audible signal type, institute
It states electric whistle button SB and issues audible signal for controlling whether；
It is IC1, model are as follows: the domestic brand single-chip microcontroller of STC15W408AS that the single-chip microprocessor MCU, which selects specification,；The single-chip microcontroller
STC15W408AS's has been internally integrated: three road CCP modules, 10,8 tunnel ADC and analog comparator all the way；The electric whistle button SB
As auto horn button, acoustic signal is issued for controlling whether；The selection switch S1 is used for artificial selection electric whistle musical sound
Type；The vehicle speed sensor is used to detect the travel speed of automobile, when the P1.1 mouth of the single-chip microcontroller STC15W408AS exports
When the digital sound bass signal of PWM modulation, the loudspeaker SP is controlled by the switch power amplifier and is pronounced, the single-chip microcontroller
The P1.6 mouth of STC15W408AS is used for output switch control signal, is electrically connected with the electric whistle relay drive circuit；
The condition indication circuit includes: resistance R16, resistance R17 and Light-Emitting Diode LED1, Light-emitting diode LED 2, when
When using high pitch electric whistle, Light-emitting diode LED 1 is lighted luminous；When using bass electric whistle, 2 brighten the hairs of Light-emitting diode LED
Light；The light emitting diode that the Light-emitting diode LED 1 selects luminescent color different with Light-emitting diode LED 2, the resistance R16
As the current-limiting resistance of Light-Emitting Diode LED1, current-limiting resistance of the resistance R17 as Light-emitting diode LED 2.
2. a kind of automobile electric whistle PWM control device according to claim 1, which is characterized in that the high pitch electric whistle is mesh
The high pitch electric automobile horn carried on preceding automobile, the loudspeaker SP are bass electric whistle.
3. a kind of automobile electric whistle PWM control device according to claim 1, which is characterized in that the vehicle speed sensor is defeated
Pulse signal counts pulse input end by the P3.4 interface access of the single-chip microcontroller STC15W408AS out, for detecting automobile
Travel speed, and the pulse number detected by each second, to judge the travel speed of automobile.
4. a kind of automobile electric whistle PWM control device according to claim 1, which is characterized in that the vehicle speed sensor is set
High pitch electric whistle can be enabled by being calculated as the when side when speed is more than 40Km/, when speed is in 40Km/ below when select automatically it is low
Sound electric whistle, in speed 40KM/ below when detect and select electric whistle audible signal type according to pyroelectric sensor, in order to avoid near
Pedestrian causes to frighten.
5. a kind of automobile electric whistle PWM control device according to claim 1, which is characterized in that the switch power amplification
Device is constituted using IGBT and driving circuit；Pass through triode V2, triode V3, triode V4 and resistance R13, resistance R18 structure
At driving circuit；When the P1.1 foot of single-chip microcontroller STC15W408AS exports low level, the triode V2, triode V4 cut-off,
Triode V3 saturation conduction, 14V power supply apply high level to the grid of IGBT through capacitor C9, make its saturation conduction；When the list
When the P1.1 foot of piece machine STC15W408AS exports high level, the triode V2, triode V4 saturation conduction, triode V3 are cut
Only, capacitor C9 discharges by triode V3, and applying negative pulse to the grid of IGBT turns off it rapidly, and wherein resistance R13 is used for
The control of triode V2 base current, resistance R18 provide the discharge path of capacitor C9.
6. a kind of automobile electric whistle PWM control device according to claim 1, which is characterized in that the electric whistle relay drives
Dynamic circuit includes: the emitter ground connection of relay J, diode D3, resistance R14 and triode V1, the triode V1；This structure
Connection can be very good to complete to drive former vehicle electric whistle relay steady operation, controls former automobile electric whistle and issues high pitched signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610190326.4A CN105857167B (en) | 2016-03-30 | 2016-03-30 | A kind of automobile electric whistle PWM control device |
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| CN201610190326.4A CN105857167B (en) | 2016-03-30 | 2016-03-30 | A kind of automobile electric whistle PWM control device |
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| CN114148254B (en) * | 2021-11-30 | 2024-02-13 | 重庆长安汽车股份有限公司 | Automobile low-speed prompt tone realization system |
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