CN105857167A - Pulse width modulation (PWM) control device for automotive electric whistle - Google Patents
Pulse width modulation (PWM) control device for automotive electric whistle Download PDFInfo
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- CN105857167A CN105857167A CN201610190326.4A CN201610190326A CN105857167A CN 105857167 A CN105857167 A CN 105857167A CN 201610190326 A CN201610190326 A CN 201610190326A CN 105857167 A CN105857167 A CN 105857167A
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- electric whistle
- automobile
- whistle
- pwm
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- 230000005021 gait Effects 0.000 claims description 9
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 6
- 238000004020 luminiscence type Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 5
- 238000004132 cross linking Methods 0.000 claims description 3
- 230000005616 pyroelectricity Effects 0.000 claims description 3
- 238000009394 selective breeding Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract 1
- 230000036449 good health Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 239000000523 sample Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000001755 vocal effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Circuit For Audible Band Transducer (AREA)
- Amplifiers (AREA)
Abstract
The invention provides a pulse width modulation (PWM) control device for an automotive electric whistle. The PWM control device for the automotive electric whistle comprises a single-chip microcomputer microcontroller unit (MCU), a switching power amplifier, a horn SP, an electric whistle relay driving circuit, a vehicle speed sensor, a pyroelectric sensor, an electric whistle button SB, a selective switch S1, a state indicating circuit and another selective switch S1. The PWM control device for the automotive electric whistle is scientific and reasonable in design and safe and reliable in work; on the premise that using safety is guaranteed, energy consumption is reduced, and secondary disasters caused by noise are reduced; the probability of the existing common road rage phenomenon can also be lowered, and the effect of constructing a harmonious society is achieved to a certain extent; and by the adoption of the control device, the sound volume and tone of the automotive electric whistle can be adjusted and controlled automatically according to the automobile speed and the traveling environment, so that the using function of an automobile is enhanced, and the good health and the harmonious environment are guaranteed.
Description
Technical field
The present invention relates to automobile electric whistle technical field, especially a kind of automobile electric whistle PWM controls dress
Putting, this device can pass through surrounding and the size of speed, judges the noise shadow to electric whistle
Ring, then confirm optimal electric whistle volume, possess volume and ability that tone regulates simultaneously,
This kind of apparatus structure is simple, and design science not only reduces the waste of electric energy, is also substantially improved
Because of the vehicle increasingly increased with block up, the noise secondary disaster brought to city, improve life
State environment, protects the health of people.
Background technology
Automobile in the market is provided with loudspeaker of blowing a whistle, and some medium-to-high grade automobiles further provided with
Anti-theft loudspeaker；In vehicle traveling process, driver triggers loudspeaker of blowing a whistle as required, warning
Pedestrian or cause other vehicle to note, can be additionally used in simultaneously and urges row and transmission signal etc.；
The working method of automobile electric whistle in the market, existing employing traditional relay controls
Articulation type, also has and uses electronic circuit to realize control, and have can be according to motor vehicle environment ring
Border regulation volume, but there is presently no appearance and adjust according to environment surrounding automobile and speed vehicle condition simultaneously
Joint carries out volume adjusting, and when city runs at a low speed, car horn generation strong noise causes makes an uproar
Sound pollution, easily causes the scaring of pedestrian and the damage of organ, and this automobile is electric
Flute will also result in the waste of electric energy, occupied fund cost；
Automobile developed very swift and violent in recent years, and the noise pollution problem thereby resulted in is the most prominent
Go out, in order to better illustrate the operation principle of vehicle whistle loudspeaker in prior art, now illustrate certain
Existing automobile horn control device technology frame chart is carried out with reference to understanding, as shown in Figure 1；This device
Including: probe unit, control unit, concussion unit and loudspeaker unit；Described probe unit bag
Include: noise transducer and mark sensor；It is in place that described noise transducer is used for gathering automobile institute
Put the noise of environment；Described mark sensor is for the road markings of probe vehicle position；
Described probe unit is used for probe vehicle position ambient signal；Described control unit includes:
Processing module, rheonome and agitator；Described agitator includes: solenoid drives electricity
Road and the coil diaphragm being connected with electromagnetic coil driving circuit；One end of described control unit with
One end of described probe unit is electrically connected, and described control unit is for single by detection according to obtain
The ambient signal that unit sends, judges automobile local environment with this, and according to residing for automobile
The concrete condition regulation sound volume of automobile horn of environment；The concrete condition of described automobile local environment is also
It is included in vehicle traveling process, it is possible to automobile local environment is identified, and according to automobile
Local environment regulation sound volume of automobile horn, thus meeting the premise of car horn functional requirement
Under, can automatically reduce sound volume of automobile horn size in special time and special area, reach fall
Noise and save the energy purpose, but this device exist a fatal defect, i.e. volume and
Tone can not regulate simultaneously, and this design defect the most far from adapts to current city traffic environment
Need.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of automobile electric whistle PWM and control
Device, this control device design science, safe and reliable, by surrounding and speed
Size, confirms optimal electric whistle volume, reduces using single power consumption pattern in the past with this
Produced electric whistle volume, by regulation volume, reaches to reduce the purpose of power consumption, with
Time decrease the unfavorable factor that noise brings；
In order to solve above-mentioned technical problem, the present invention provides a kind of automobile electric whistle PWM to control dress
Putting, described control device includes following structure division:
Single-chip microprocessor MCU, switch power amplifier, loudspeaker SP, electric whistle relay drive circuit,
Vehicle speed sensor, pyroelectric sensor, electric whistle button SB, condition indication circuit and selection are opened
Close S1；
Illustrate as one, an outfan output pwm pulse of described single-chip microprocessor MCU
Signal is to switch power amplifier；
Illustrating as one, described switch power amplifier is used for driving loudspeaker SP to pronounce；
Illustrate as one, another outfan of described single-chip microprocessor MCU and described electric whistle
The input electrical connection of relay drive circuit, the outfan of described electric whistle relay drive circuit
Connect the high pitch automobile electric whistle carried on automobile；
Illustrating as one, the analog input end of described single-chip microprocessor MCU is released with described heat
The outfan electrical connection of electric transducer；
Illustrating as one, described pyroelectric sensor is pyroelectric infrared-sensing type sensing
Device；
Illustrate as one, the count pulse input of described single-chip microprocessor MCU and described car
The outfan electrical connection of speed sensor；
Illustrating as one, the first On-off signal end of described single-chip microprocessor MCU is with described
Electric whistle button SB electrically connects；
As one illustrate, described single-chip microprocessor MCU second, third, the 4th switching value
Input forms selecting type switching circuit structure with selecting switch S1；
As a kind of applicating example explanation, when speed is little more than 40KM/ and there be nobody nearby and
Che Shi, uses high pitch electric whistle the most automatically；When the neighbouring people of having and Che (people and vehicle have oneself 8 meters with
In) and speed less than 40KM/ hour, the most automatically use loudspeaker SP, thus reduce and make an uproar
Sound, the purpose of saving electric energy；
As a kind of applicating example explanation, described high pitch electric whistle uses the height carried on current automobile
Sound electric automobile horn；
As a kind of applicating example explanation, described loudspeaker SP is bass electric whistle；
Illustrating as one, described switch power amplifier electrically connects with described loudspeaker SP；
The combinative structure using bass electric whistle and switch power amplifier can ensure that described bass
The tone of electric whistle is relatively low, and volume is less, and this structure also can send vocal music class audible signal and
Voice signal；
The operation principle of device is controlled in order to better illustrate one automobile electric whistle PWM of the present invention,
Now illustrate that its structure and work process are as follows by preferred embodiment: (with reference to shown in Fig. 2)
1. circuit operation principle:
Described selection switch S1 is used for manually selecting audible signal type, described electric whistle button SB
Send audible signal for controlling whether；
Described vehicle speed sensor is for detecting the gait of march of automobile, and design principle is when speed surpasses
High pitch electric whistle can be enough enabled the when of when crossing 40Km/, automatic when speed is at below 40Km
Select bass electric whistle, time below speed 40KM, select electric whistle according to pyroelectric sensor detection
Audible signal type, in order to avoid causing scaring to neighbouring pedestrian；
2. scheme is implemented:
Illustrating as one, described single-chip microprocessor MCU selects specification to be the domestic brand of IC1,
Model is: the single-chip microcomputer of STC15W408AS；The annexation of the present invention and operation principle citing
All use STC15W408AS pin design relationship description；
Illustrating as one, described bass signal is produced by single-chip microprocessor MCU, described monolithic
Machine STC15W408AS has been internally integrated: three road CCP modules, 10,8 tunnel ADC and
Road analog comparater；The single-chip microcomputer selecting this 20P enough meets the design requirement of the present invention；
Illustrating as one, the purpose selecting described domestic single-chip microcomputer is that it has in price
Advantage, and its reliability experiments verify that respond well；
As a kind of applicating example explanation, described single-chip microprocessor MCU can also use PIC16F873A
Single-chip microcomputer, the single-chip microcomputer of this kind of specification experiments verify that and disclosure satisfy that requirement equally；
Described PIC16F873A single-chip microcomputer has: 5 passage ADC, and two CCP modules can be square
Just output two-way pwm signal, reliability is high, price, time selects it after comparing cost performance；
As one illustrate, described condition indication circuit includes: resistance R14, R15 with
And Light-Emitting Diode LED1, LED2, when using high pitch electric whistle, LED1 lights luminescence；When
When using bass electric whistle, LED2 lights luminescence；
As a kind of applicating example explanation, in order to obtain effect the most intuitively, described LED1
The light emitting diode that glow color is different is selected with LED2；
As a kind of applicating example explanation, described R15, R14 are as described Light-Emitting Diode LED1
Current-limiting resistance with LED2；
Illustrating as one, described vehicle speed sensor output pulse signal passes through described monolithic
The P3.4 interface of machine MCU accesses counting input end, is used for detecting automobile gait of march, and leads to
The pulse number spent each second and detect, judges the gait of march of automobile；
Illustrating as one, the output signal of described pyroelectric sensor is through integrated transporting discharging
It is added to the P1.0 mouth of described single-chip microcomputer after amplification, inside described single-chip microprocessor MCU, completes ADC
Conversion, for determining the ambient conditions of surrounding people and vehicle thereof, single-chip microprocessor MCU determines therefrom that
Pronunciation type and volume height；
Illustrating as one, described electric whistle button SB, as auto horn button, is used for
Control whether to send acoustic signal；
Illustrating as one, described selection switchs S1 for artificial selection's electric whistle musical sound class
Type；
When the P1.1 mouth of described single-chip microprocessor MCU exports the digital sound bass signal of PWM
Time, described switch power amplifier control described loudspeaker SP pronunciation；
Illustrating as one, described switch power amplifier uses IGBT and drive circuit
Constitute；Wherein audion V2, V3, V4 and resistance R13, R18 constitute drive circuit；When
During P1.1 foot output low level, described V2, V4 end, V3 saturation conduction, 14V power supply warp
Electric capacity C9 applies high level to the grid of IGBT so that it is saturation conduction；When described single-chip microcomputer
When the P1.1 foot of MCU exports high level, described audion V2, V4 saturation conduction, V3 ends,
Electric capacity C9 discharges through V3, applies negative pulse to the grid of IGBT and makes it turn off rapidly, its
Middle resistance R13 provides electric capacity C9's for the control of audion V2 base current, resistance R18
Discharge path；
As a kind of applicating example explanation, the switching speed (modulating frequency) of described IGBT is
Through reaching 100KHz/S, and existing automobile to provide loudspeaker for oneself be all middle bass specification, so
Switch modulation frequency be sufficient for design requirement；
Illustrating as one, the P1.6 mouth of described single-chip microprocessor MCU is used for output switch control
Signal processed, electrically connects with described electric whistle relay drive circuit；
Illustrating as one, described electric whistle relay drive circuit includes: relay J,
Diode D3, resistance R14 and audion V1, the grounded emitter of described audion V1；This
Structure connection can well complete to drive former car electric whistle relay steady operation, controls former automobile
Electric whistle sends high pitched signal；
The pwm signal of the P1.1 mouth output of described single-chip microprocessor MCU includes two kinds of control actions:
1. the height of volume can use PWM method to be controlled；
2. the height of tone can also be realized by PWM；
Illustrate as one, can take to change the modulating wave dutycycle of described pwm signal
The height realizing volume controls, and this is by controlling the realization of the meansigma methods of dutycycle；
Illustrating as one, described control dutycycle can become according to certain rule
Change, so can realize the high frequency modulated of acoustic signal, say in a sense and can be called out
Close power amplifier, than conventional analogue signal power amplifier, there is higher efficiency, simultaneously
Reduce the power model requirement to heat radiation；
Illustrating as one, described pyroelectric sensor includes: pyroelectricity detection device
DS, Fresnel Lenses, integrated transporting discharging A1, A2, resistance R2 to R11；Electric capacity C1 to C6；
Diode D2；
Illustrate as one, before described DS, lens are installed；
Illustrating as one, described lens are Fresnel Lenses；
Wherein, described A1 and resistance R6, R9, R3, R4 and electric capacity C6 etc. constitute anti-phase ratio
Example amplifier；Described A2 and resistance R7, R9, R10, R11 and electric capacity C6 etc. constitute anti-phase
Proportional amplifier；Described R2, R3, R6, R8, electric capacity C4 constitutes second level aspect ratio and puts
Big device；Described C2, C5 are crosslinking electric capacity, and C4, C6 are alternating current bypass electric capacity；
Illustrating as one, described D2, C1 constitute detecting circuit, once du vehicule
Having pedestrian or vehicle to pass by, the P1.0 pin current potential of described single-chip microprocessor MCU raises, then by
Its internal A/D convertor circuit is converted into digital signal；Select to make after numerical value exceedes setting value
Volume is sent suitable, the note signal that tone is relatively low with bass electric whistle (loudspeaker SP)；
The Advantageous Effects of the present invention:
1. the control device design science of the present invention is reasonable, safe and reliable, can ensure peace
On the premise of full use, reduce the consumption of the energy and the secondary disaster of noise, also can reduce mesh
Before " the road anger phenomenon " that generally exist, play certain effect building harmonious society；
2. the control device of this invention can according to speed and running environment the sound to automobile electric whistle
Measure, tone automatically adjusts control, enhances the use function of automobile, protects people's
Healthy harmonious with link；
Accompanying drawing explanation
Fig. 1 is that the structure of automobile electric whistle of the present invention existing control technology (CN201342510) is former
Reason schematic diagram
Fig. 2 is the theory structure schematic diagram that the present invention a kind of automobile electric whistle PWM controls device
Fig. 3 is the concrete electricity that the present invention a kind of automobile electric whistle PWM controls the preferred embodiment of device
Line structure connects figure
Fig. 4 is that one automobile electric whistle PWM of the present invention controls the another kind of specification single-chip microcomputer of device employing
(PIC16F873A) experiment simulation schematic diagram, through emulation testing, it is possible to reach expection effect
Really
Detailed description of the invention
Below in conjunction with the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
With reference to Fig. 2 to Fig. 4, a kind of automobile electric whistle PWM controls device, described control device bag
Include following structure division:
Single-chip microprocessor MCU 101, switch power amplifier 102, loudspeaker SP103, electric whistle relay
Drive circuit 104, vehicle speed sensor 105, pyroelectric sensor 106, electric whistle button SB107,
Select switch S1108 and condition indication circuit 109；
Illustrate as one, an outfan output PWM of described single-chip microprocessor MCU 101
Pulse signal is to switch power amplifier 102；
Illustrating as one, described switch power amplifier 102 is used for driving loudspeaker
SP103 pronounces；
Illustrating as one, another outfan of described single-chip microprocessor MCU 101 is with described
The input electrical connection of electric whistle relay drive circuit 104, described electric whistle relay drive circuit
The outfan of 104 connects the high pitch automobile electric whistle carried on automobile；
Illustrating as one, the analog input end of described single-chip microprocessor MCU 101 is with described
The outfan electrical connection of pyroelectric sensor 106；
Illustrating as one, described pyroelectric sensor 106 is pyroelectric infrared-sensing type
Sensor；
Illustrate as one, the count pulse input of described single-chip microprocessor MCU 101 and institute
State the outfan electrical connection of vehicle speed sensor 105；
As one illustrate, the first On-off signal end of described single-chip microprocessor MCU 101 with
Described electric whistle button SB107 electrically connects；
Illustrate as one, described single-chip microprocessor MCU 101 second, third, the 4th open
Pass amount input forms selecting type switching circuit structure with selecting switch S1108；
As a kind of applicating example explanation, when speed is little more than 40KM/ and there be nobody nearby and
Che Shi, uses high pitch electric whistle the most automatically；When the neighbouring people of having and Che (people and vehicle have oneself 8 meters with
In) and speed less than 40KM/ hour, the most automatically use loudspeaker SP, thus reduce and make an uproar
Sound, the purpose of saving electric energy；
As a kind of applicating example explanation, described high pitch electric whistle uses the height carried on current automobile
Sound electric automobile horn；
As a kind of applicating example explanation, described loudspeaker SP103 is bass electric whistle；
Illustrate as one, described switch power amplifier 102 and described loudspeaker SP103
Electrical connection；
The combinative structure using bass electric whistle and switch power amplifier 102 can ensure that described
The tone of bass electric whistle is relatively low, and volume is less, and this structure also can send vocal music class sound letter
Number and voice signal；
The operation principle of device is controlled in order to better illustrate one automobile electric whistle PWM of the present invention,
Now illustrate that its structure and work process are as follows by preferred embodiment: (with reference to shown in Fig. 2)
1. circuit operation principle:
Described selection switch S1108 is used for manually selecting audible signal type, described electric whistle button
SB107 is used for controlling whether to send audible signal；
Described vehicle speed sensor 105 is for detecting the gait of march of automobile, and design principle is to work as car
Speed is more than can enough enable high pitch electric whistle when of during 40Km/, when speed is at below 40Km
Automatically select bass electric whistle, detect according to pyroelectric sensor 106 time below speed 40KM
Select electric whistle audible signal type, in order to avoid neighbouring pedestrian is caused scaring；
2. scheme is implemented:
Illustrating as one, described single-chip microprocessor MCU 101 selects specification to be the domestic of IC1
Brand, model is: the single-chip microcomputer of STC15W408AS；
Illustrating as one, described bass signal is produced by single-chip microprocessor MCU 101, described
Single-chip microcomputer STC15W408AS has been internally integrated: three road CCP modules, 10,8 tunnel ADC
With a road analog comparater；The single-chip microcomputer selecting this 20P enough meets the design of the present invention to be wanted
Ask；
Illustrating as one, the purpose selecting described domestic single-chip microcomputer is that it has in price
Advantage, and its reliability experiments verify that respond well；
As a kind of applicating example explanation, described single-chip microprocessor MCU can also use PIC16F873A
Single-chip microcomputer, the single-chip microcomputer of this kind of specification experiments verify that and disclosure satisfy that requirement equally；
Described PIC16F873A single-chip microcomputer has: 5 passage ADC, and two CCP modules can be square
Just output two-way pwm signal, reliability is high, price, time selects it after comparing cost performance；
Illustrating as one, described condition indication circuit 109 includes: resistance R14, R15
And Light-Emitting Diode LED1, LED2, when using high pitch electric whistle, LED1 lights luminescence；
When using bass electric whistle, LED2 lights luminescence；
As a kind of applicating example explanation, in order to obtain effect the most intuitively, described LED1
The light emitting diode that glow color is different is selected with LED2；
As a kind of applicating example explanation, described R15, R14 are as described Light-Emitting Diode LED1
Current-limiting resistance with LED2；
Illustrating as one, described vehicle speed sensor 105 output pulse signal is by described
The P3.4 interface of single-chip microprocessor MCU accesses counting input end, is used for detecting automobile gait of march,
And by the pulse number that each second detects, judge the gait of march of automobile；
Illustrating as one, the output signal of described pyroelectric sensor 106 is through integrated
Amplifier is added to the P1.0 mouth of described single-chip microcomputer 101 after amplifying, in described single-chip microprocessor MCU 101
Portion completes ADC conversion, for determining the ambient conditions of surrounding people and vehicle thereof, single-chip microcomputer
MCU determines therefrom that pronunciation type and volume height；
Illustrating as one, described electric whistle button SB107, as auto horn button, uses
Send acoustic signal in controlling whether；
Illustrating as one, described selection switchs S1108 for artificial selection's electric whistle musical sound
Type；
When the P1.1 mouth of described single-chip microprocessor MCU 101 exports the low message of digital sound of PWM
Number time, by described switch power amplifier 102 control described loudspeaker SP103 pronunciation；
Illustrating as one, described switch power amplifier 102 uses IGBT and driving
Circuit is constituted；Wherein audion V2, V3, V4 and resistance R13, R18 constitute drive circuit；
When P1.1 foot output low level, described V2, V4 end, V3 saturation conduction, 14V power supply
High level is applied to the grid of IGBT so that it is saturation conduction through electric capacity C9；When described single-chip microcomputer
When the P1.1 foot of MCU exports high level, described audion V2, V4 saturation conduction, V3 ends,
Electric capacity C9 discharges through V3, applies negative pulse to the grid of IGBT and makes it turn off rapidly, its
Middle resistance R13 provides electric capacity C9's for the control of audion V2 base current, resistance R18
Discharge path；
As a kind of applicating example explanation, the switching speed (modulating frequency) of described IGBT is
Through reaching 100KHz/S, and existing automobile to provide loudspeaker for oneself be all middle bass specification, so
Switch modulation frequency be sufficient for design requirement；
Illustrating as one, the P1.6 mouth of described single-chip microprocessor MCU 101 is used for output switch
Control signal, electrically connects with described electric whistle relay drive circuit 104；
Illustrating as one, described electric whistle relay drive circuit 104 includes: relay
J, diode D3, resistance R14 and audion V1, the grounded emitter of described audion V1；
The connection of this structure can well complete to drive former car electric whistle relay steady operation, controls former vapour
Car electric whistle sends high pitched signal；
The pwm signal of the P1.1 mouth output of described single-chip microprocessor MCU 101 includes that two kinds control to make
With:
1. the height of volume can use PWM method to be controlled；
2. the height of tone can also be realized by PWM；
Illustrate as one, can take to change the modulating wave dutycycle of described pwm signal
The height realizing volume controls, and this is by controlling the realization of the meansigma methods of dutycycle；
Illustrating as one, described control dutycycle can become according to certain rule
Change, so can realize the high frequency modulated of acoustic signal, say in a sense and can be called out
Close power amplifier, than conventional analogue signal power amplifier, there is higher efficiency, simultaneously
Reduce the power model requirement to heat radiation；
Illustrating as one, described pyroelectric sensor 106 includes: pyroelectricity detector
Part DS, Fresnel Lenses, integrated transporting discharging A1, A2, resistance R2 to R11；Electric capacity C1 is extremely
C6；Diode D2；
Illustrate as one, before described DS, lens are installed；
Illustrating as one, described lens are Fresnel Lenses；
Wherein, described A1 and resistance R6, R9, R3, R4 and electric capacity C6 etc. constitute anti-phase ratio
Example amplifier；Described A2 and resistance R7, R9, R10, R11 and electric capacity C6 etc. constitute anti-phase
Proportional amplifier；Described R2, R3, R6, R8, electric capacity C4 constitutes second level aspect ratio and puts
Big device；Described C2, C5 are crosslinking electric capacity, and C4, C6 are alternating current bypass electric capacity；
Illustrating as one, described D2, C1 constitute detecting circuit, once du vehicule
Having pedestrian or vehicle to pass by, the P1.0 pin current potential of described single-chip microprocessor MCU raises, then by
Its internal A/D convertor circuit is converted into digital signal；Select to make after numerical value exceedes setting value
Volume is sent suitable, the note signal that tone is relatively low with bass electric whistle (loudspeaker SP)；
The control device design science of the present invention is reasonable, safe and reliable, can ensure safety
On the premise of use, reduce the consumption of the energy and the secondary disaster of noise, also can reduce at present
" the road anger phenomenon " generally existed, plays certain effect building harmonious society；This invention
Control device can according to speed and running environment the volume of automobile electric whistle, tone carried out from
Dynamic regulation controls, and enhances the use function of automobile, protects the healthy of people and link
Harmonious；
Above-described only the preferred embodiments of the present invention, be it should be understood that above enforcement
The explanation of example is only intended to help to understand method and the core concept thereof of the present invention, is not used to limit
Determining protection scope of the present invention, that is done within all thought in the present invention and principle any repaiies
Change, equivalent etc., should be included within the scope of the present invention.
Claims (10)
1. an automobile electric whistle PWM controls device, it is characterised in that include following structural portion
Point: single-chip microprocessor MCU, switch power amplifier, loudspeaker SP, electric whistle relay drive circuit,
Vehicle speed sensor, pyroelectric sensor, electric whistle button SB, condition indication circuit and selection are opened
Close S1；
One outfan output pwm pulse signal of described single-chip microprocessor MCU amplifies to switch power
Device；Described switch power amplifier is used for driving loudspeaker SP to pronounce；
Another outfan of described single-chip microprocessor MCU and described electric whistle relay drive circuit
Input electrically connects, and the outfan connection automobile of described electric whistle relay drive circuit carries
High pitch automobile electric whistle；The analog input end of described single-chip microprocessor MCU and described pyroelectric sensor
Outfan electrical connection；The count pulse input of described single-chip microprocessor MCU senses with described speed
The outfan electrical connection of device；First On-off signal end of described single-chip microprocessor MCU and described electric whistle
Button SB electrically connects；Described single-chip microprocessor MCU second, third, the 4th On-off signal end
Selecting type switching circuit structure is formed with selecting switch S1；Described switch power amplifier and institute
State loudspeaker SP electrical connection；Described selection switch S1 is used for manually selecting audible signal type, institute
State electric whistle button SB and send audible signal for controlling whether；
Described single-chip microprocessor MCU selects specification to be IC1, and model is: STC15W408AS's is domestic
Brand single-chip microcomputer；Described single-chip microcomputer STC15W408AS has been internally integrated: three road CCP modules,
8 10, tunnel ADC and a road analog comparater；Described electric whistle button SB presses as car horn
Button, is used for controlling whether to send acoustic signal；Described selection switchs S1 for artificial selection's electricity
Flute musical sound type；Described vehicle speed sensor is for detecting the gait of march of automobile, when described monolithic
When the P1.1 mouth of machine STC15W408AS exports the digital sound bass signal of PWM, by
Described switch power amplifier controls described loudspeaker SP pronunciation, described single-chip microcomputer STC15W408AS
P1.6 mouth for output switch control signal, be electrically connected with described electric whistle relay drive circuit
Connect.
A kind of automobile electric whistle PWM the most according to claim 1 controls device, and its feature exists
In, described high pitch electric whistle is the high pitch electric automobile horn carried on current automobile, described loudspeaker
SP is bass electric whistle.
A kind of automobile electric whistle PWM the most according to claim 1 controls device, its feature
Being, described pyroelectric sensor includes: pyroelectricity detection device DS, Fresnel Lenses,
Integrated transporting discharging A1, A2, resistance R2 to R11；Electric capacity C1 to C6；Diode D2；Described
Lens are installed before DS；Described lens are Fresnel Lenses；Described A1 and resistance R6, R9,
R3, R4 and electric capacity C6 etc. constitute anti-phase proportional amplifier；Described A2 and resistance R7, R9,
R10, R11 and electric capacity C6 etc. constitute anti-phase proportional amplifier；Described R2, R3, R6, R8,
Electric capacity C4 constitutes second level aspect ratio amplifier；Described C2, C5 are crosslinking electric capacity, C4,
C6 is alternating current bypass electric capacity；Described D2, C1 constitute detecting circuit, and once du vehicule has row
People or vehicle are passed by, and the P1.0 pin current potential of described single-chip microcomputer STC15W408AS raises,
It is converted into digital signal again by its internal A/D convertor circuit；Select after numerical value exceedes setting value
Select use bass electric whistle (loudspeaker SP) and send volume suitably, the note signal that tone is relatively low.
A kind of automobile electric whistle PWM the most according to claim 1 controls device, its feature
Being, described single-chip microprocessor MCU can also is that PIC16F873A single-chip microcomputer, described PIC16F873A
Single-chip microcomputer has: 5 passage ADC, two CCP modules, can export two-way PWM letter easily
Number.
A kind of automobile electric whistle PWM the most according to claim 1 controls device, its feature
Being, described condition indication circuit includes: resistance R14, R15 and Light-Emitting Diode LED1,
LED2, when using high pitch electric whistle, LED1 lights luminescence；When using bass electric whistle, LED2
Light luminescence；Described LED1 with LED2 selects the light emitting diode that glow color is different, institute
State R15, R14 current-limiting resistance as described Light-Emitting Diode LED1 and LED2.
A kind of automobile electric whistle PWM the most according to claim 1 controls device, its feature
Being, described vehicle speed sensor output pulse signal is by described single-chip microcomputer STC15W408AS's
P3.4 interface accesses counting input end, is used for detecting automobile gait of march, and passes through each second
The pulse number detected, judges the gait of march of automobile.
A kind of automobile electric whistle PWM the most according to claim 1 controls device, its feature
Being, the output signal of described pyroelectric sensor is added to described list after integrated transporting discharging amplifies
The P1.0 mouth of sheet machine STC15W408AS, completes inside described single-chip microcomputer STC15W408AS
ADC changes, and for determining the ambient conditions of surrounding people and vehicle thereof, single-chip microprocessor MCU is accordingly
Determine pronunciation type and volume height.
A kind of automobile electric whistle PWM the most according to claim 1 controls device, its feature
It is, can enough enable the when that described vehicle speed sensor being designed as when speed is more than 40Km/
High pitch electric whistle, automatically selects bass electric whistle when speed is at below 40Km, speed 40KM with
Electric whistle audible signal type will be selected according to pyroelectric sensor detection time lower, in order to avoid to neighbouring pedestrian
Cause scaring.
A kind of automobile electric whistle PWM the most according to claim 1 controls device, its feature
Being, described switch power amplifier uses IGBT and drive circuit to constitute；Pass through audion
V2, V3, V4 and resistance R13, R18 constitute drive circuit；When P1.1 foot exports low electricity
At ordinary times, described V2, V4 end, V3 saturation conduction, 14V power supply through electric capacity C9 to IGBT
Grid apply high level so that it is saturation conduction；When described single-chip microcomputer STC15W408AS's
During P1.1 foot output high level, described audion V2, V4 saturation conduction, V3 ends, electric capacity
C9 discharges through V3, applies negative pulse to the grid of IGBT and makes it turn off rapidly, Qi Zhong electricity
Resistance R13 provides the electric discharge of electric capacity C9 for the control of audion V2 base current, resistance R18
Path.
A kind of automobile electric whistle PWM the most according to claim 1 controls device, its feature
Being, described electric whistle relay drive circuit includes: relay J, diode D3, resistance
R14 and audion V1, the grounded emitter of described audion V1；This structure connects can be very
Good completes to drive former car electric whistle relay steady operation, controls former automobile electric whistle and sends high message
Number.
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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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114148254A (en) * | 2021-11-30 | 2022-03-08 | 重庆长安汽车股份有限公司 | Automobile low-speed prompt tone implementation system |
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| CN105857167B (en) | 2019-01-18 |
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