CN101367353A - Apparatus and method for governing display lightness of automobile instrument - Google Patents
Apparatus and method for governing display lightness of automobile instrument Download PDFInfo
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- CN101367353A CN101367353A CNA2007100757401A CN200710075740A CN101367353A CN 101367353 A CN101367353 A CN 101367353A CN A2007100757401 A CNA2007100757401 A CN A2007100757401A CN 200710075740 A CN200710075740 A CN 200710075740A CN 101367353 A CN101367353 A CN 101367353A
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Abstract
The invention discloses a display brightness adjusting device for motormeters. The device comprises a photoelectric sensor for converting sensed brightness of ambient light into a corresponding electric signal to be output; a processor for making a response to the electric signal output by the photoelectric sensor and outputting a corresponding control signal; and a power conversion module for making a response to the control signal output by the processor and outputting a corresponding voltage signal to a display motormeter. The invention also discloses a display brightness adjusting method for the motormeters. The adjusting device and the adjusting method overcomes the drawbacks of the prior motormeter that the display brightness is fixed or only can be manually and roughly adjusted by few grades, and can adjust the display brightness of the motometers to the best as well as saves energy effectively.
Description
[technical field]
The present invention relates to a kind of auto meter display brightness control apparatus and method, relate in particular to auto meter display brightness control apparatus and the method that to regulate brightness according to the requirement of ambient brightness and chaufeur self.
[background technology]
In order to make chaufeur can grasp the service condition of automobile and each system at any time, the state parameter of various each significant points of display automobile such as the speed of a motor vehicle, rotating speed, fuel oil, electric weight and the indicating instrument of vehicle operating parameter are housed on the instrument desk in chaufeur the place ahead.For convenience chaufeur can clearly be known the service condition of indicating instrument under the darker situation of light, usually comprise instrument display panel and light source at indicating instrument, generally, light source be placed on the instrument display panel below, light source is the backlight that is made of light-emitting diode, make chaufeur can see data presented by led lighting, understand the running state of automobile.
But the display brightness of existing instrument carrier panel is generally just fixing when automobile dispatches from the factory, perhaps can only manual several grades of more rough adjustings, run counter to energy-conservation aim like this, can not adjust to best state at the display brightness of the darker following instrument carrier panel of situation of operator's compartment light and satisfy different vision needs, obtain information to chaufeur and make troubles.
[summary of the invention]
Main purpose of the present invention solves the problems of the prior art exactly, and a kind of auto meter display brightness control apparatus and method are provided, can be to the automatic brightness adjustment of backlight according to the intensity of operator's compartment light.
Of the present invention time a purpose just provides a kind of auto meter display brightness control apparatus and method, and chaufeur can pass through manual regulation according to the demand of oneself, display brightness is finely tuned, to reach best visual effect.
For achieving the above object, the invention provides a kind of auto meter display brightness control apparatus, comprising:
Opto-electronic pickup, the brightness transition that is used for the surround lighting that will sense are corresponding electric signal output;
Treater is used for the electric signal that the response light electric transducer is exported, the output control signal corresponding;
Power transfer module is used for the control signal that answer processor is exported, and output correspondent voltage signal is to indicating instrument.
Wherein said treater preferably includes A/D converting unit and pulse width modulator, the electric signal of described A/D converting unit response light electric transducer output, the output digital signal corresponding is to pulse width modulator, and described pulse width modulator produces corresponding PWM ripple according to digital signal and exports the feedback end of power transfer module to.
The voltage signal output end of described power transfer module is coupled to the light source of indicating instrument.
Described device also comprises filter circuit and amplifying circuit, and the input end of described filter circuit connects the mouth of opto-electronic pickup, and mouth connects the input end of amplifying circuit, and the mouth of described amplifying circuit connects the A/D converting unit.
Further improvement of the present invention is: described device also comprises coder, the input end of described coder is used to accept input, mouth output two pulse signals is to treater, described treater is determined the size and the symbol of changing value according to two pulse signals, and with the new PWM ripple of output after the value of current PWM ripple and the changing value addition.
Further, described device also comprises master cock, and described master cock is coupled to treater, and the two pulse signals that described treater is exported coder according to the state of master cock responds or shields.
For achieving the above object, the present invention provides a kind of auto meter display lightness regulating method simultaneously, may further comprise the steps:
The brightness of A1, opto-electronic pickup induced environment light is also exported corresponding electric signal;
B1, treater be according to the size of electric signal, the output control signal corresponding;
C1, power transfer module to indicating instrument, are regulated the display brightness of indicating instrument according to control signal output correspondent voltage signal.
Further, described step B1 can may further comprise the steps again:
B11, between the maxim of predefined electric signal and minimum value, mark off N interval, each interval corresponding a kind of PWM ripple;
B12, the electric signal in the steps A 1 is converted to digital signal;
B13, the pairing interval of judgement digital signal, thus draw the cooresponding PWM ripple of this digital signal;
B14, export this PWM ripple to power transfer module.
In described step B11, described N interval PWM ripple is arithmetic progression or linear.
In described step C1, described voltage signal is outputed to of the brightness of the light source of indicating instrument with the control light source.
Further improvement of the present invention is: this auto meter display lightness regulating method also can comprise trim step:
D1, coder are accepted user's input;
E1, according to user's input, export corresponding two pulse signals to treater;
F1, described treater determine the size and the symbol of changing value according to two pulse signals, and with the new PWM ripple of output after the value of current PWM ripple and the changing value addition;
G1, power transfer module to indicating instrument, are regulated the display brightness of indicating instrument according to new PWM ripple output correspondent voltage signal.
The invention has the beneficial effects as follows:
1) among the present invention, opto-electronic pickup gathers the operator's compartment optical signal, deliver to treater after converting electric signal to, provide the control signal of energy supply control module according to the information that obtains by treater, energy supply control module can change the power line voltage that offers indicating instrument according to this control signal, thereby realize the automatically regulating of auto meter display brightness under ambient light, to reach best visual effect.
2) by setting up coder, by coder response manual fine-tuning signal, the output two pulse signals is to treater, treater is determined the variation that institute's control signal of sending out is produced according to two pulse signals under finely tuning, like this, the instrument backlight not only can also carry out trace according to the personal considerations by chaufeur and regulate with the instrument display brightness behind the correction automatically regulating according to operator's compartment light intensity automatically regulating, various demand has been satisfied in more convenient user's use.
3) the present invention has eliminated that existing instrument display brightness is fixed or defective that can only manual several grades of coarse adjustment, not only conveniently makes the instrument display brightness adjust to optimum regime, and has met energy-conservation aim, has effectively saved the energy.
[description of drawings]
Fig. 1 is the auto meter display brightness control apparatus configuration diagram of the embodiment of the invention one;
Fig. 2 is the auto meter display brightness control apparatus configuration diagram of the embodiment of the invention two;
Fig. 3 a and Fig. 3 b are the output of the rotary encoder among the present invention pulse scheme drawing;
Fig. 4 is that the PWM ripple correction of the embodiment of the invention two produces diagram of circuit;
Fig. 5 is that the PWM ripple of the embodiment of the invention two produces diagram of circuit.
[specific embodiment]
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Embodiment one:
Referring to Fig. 1, the auto meter display brightness control apparatus of present embodiment comprises opto-electronic pickup 1, filter circuit 2, amplifying circuit 3, treater and power transfer module 6.Wherein the processor adopting micro controller system 4.Micro controller system 4 is used its in-to-in A/D change-over circuit 41 and pulse width modulator 42.The mouth of opto-electronic pickup 1 connects the input end of filter circuit 2, filter circuit 2 mouths connect the input end of amplifying circuit 3, the mouth of amplifying circuit 3 is connected to the A/D input port of micro controller system 4, and the pulse width modulator output port of micro controller system 4 is received the feedback input end FB of power transfer module 6.The power output end VOUT of power transfer module 6 is coupled to indicating instrument 7.
Below working process of the present invention is described:
Opto-electronic pickup 1 is corresponding electric signal output with the brightness transition of the cab environment light sensed, signal is delivered to the A/D conversion port of micro controller system 4 after the effect of filter 2 and amplifier 3, A/D change-over circuit by micro controller system 4 carries out the A/D conversion to it, the output digital signal is to the PWM wave generation circuit of micro controller system 4, the PWM wave generation circuit produces the corresponding PWM ripple according to this digital signal and exports the feedback end FB of power transfer module 6 to, control power transfer module 6 is carried out action and is changed the power line voltage that it offers indicating instrument, thereby realizes the automatically regulating of indicating instrument light-source brightness.Wherein, the method for pwm control signal ripple dutycycle change is:
Opto-electronic pickup is converted to electric signal with the optical signal of gathering, and can preestablish its minimum value Vmin and maxim Vmax to this, and the A/D change-over circuit of micro controller system is converted to the digital signal of corresponding value between Dmin and Dmax to electric signal.Get intermediate value D1, D2 ..., Dn, between Dmin and Dmax, mark off n interval, each interval of digital signal corresponding respectively the PWM ripple predesignated a kind of: pwm1, pwm2 ..., pwmn.This corresponding relation can be expressed as:
When digital signal value was between Dmin and the D1, it was the PWM ripple of pwm1 that the PWM wave generation circuit produces shape, corresponding generation pwm2 ripple in the time of between D1 and D2, and corresponding generation pwm3 ripple in the time of between D2 and D3, and the rest may be inferred.N interval cooresponding n kind PWM ripple can be got the arithmetic progression relation, that is: pwmn=pwm1+ (n-1) d also can be taken as linear relationship, that is: pwmn=K * pwm1, and wherein K is a constant.The each change of PWM ripple is radix with previous signal value all, generates new PWM ripple on previous basis.The PWM waveforms amplitude is determined by microcontroller power supply.
The power transfer module 6 of present embodiment adopts and has feedback (Feedback, FB) Shu Ru power conversion chip, AP1509 for example, LM2575 etc.FB is by the PWM ripple control of micro controller system output, and the feedback port signal of power transfer module 6 changes thereupon when the PWM ripple changes, and power transfer module 6 responds the output voltage of adjustment mouth VOUT to this.Under the situation that indicating instrument is realized by LED, the power output end VOUT of power transfer module 6 is coupled to the light source 7 of indicating instrument, thereby reaches the effect of control instrument led light source display brightness.Under the situation that indicating instrument is realized by LCD (Liquid Crystal Display (LCD)), the power output end VOUT of power transfer module 6 can be coupled to the backlight of indicating instrument, the brightness of control backlight, thus change the brightness that instrument shows.
Embodiment two:
Be that with the difference of embodiment one the auto meter display brightness control apparatus of present embodiment also comprises rotary encoder 5 and master cock 8.When chaufeur was dissatisfied to self-regulating backlight illumination, manually rotary encoder 5 obtained fine adjustment signal, and the value that changes therefrom △ PWM revises on the basis of instrument demonstration original luminance.Wherein, the input end of rotary encoder 5 is used to accept outside fine setting input, and the two pulse signals of mouth output connects one of micro controller system 4 respectively and catches a mouthful C and a general input/output port GPIO (general purpose input/output).Master cock 8 is coupled to micro controller system 4, the two pulse signals that micro controller system 4 is exported rotary encoder 5 according to the state of this master cock 8 responds or shields, for example, when master cock 8 is opened, the two pulse signals of micro controller system 4 response coding devices 5 outputs, determine the hand of rotation and the rotation change amount of coder 5 by two pulse signals, when master cock 8 was closed, micro controller system 4 is the output of response coding device 5 not.Master cock can be a toggle switch, also can be PS (Push Switch), can also be rotor switch.Master cock can have " opening (ON) " position and " closing (OFF) " position, also can be repeatedly switch.
Referring to Fig. 4, micro controller system 4 is determined size and the symbol of PWM1 changing value △ PWM according to two pulse signals.Micro controller system 4 is caught the road output received pulse signal A of mouthful C from rotary encoder 5, by the counting machine of timer internal the pulse of signal A is counted.The cooresponding PWM changing value of setting signal A individual pulse is △ pwm, when counted number of pulses is N, and total PWM transformed value △ PWM=N * △ pwm.Micro controller system 4 is judged its sign according to turning to of rotary encoder, when just changeing this △ PWM get on the occasion of, this △ PWM gets negative value during counter-rotating.In the process of micro controller system 4 timer internals operation, when catching the energizing signal generation, immediately current timer value is copied to catching in the register in the capture circuit.Catch action and can be set to positive rise triggering or falling edge triggering.The GPIO mouth of micro controller system 4 is from another road output received pulse signal B of rotary encoder 5, judges that by the level state of signal A, B rotary encoder 5 is just to change or reverse.Referring to Fig. 3 a, Fig. 3 b, the rotary encoder 5 of two-way output is exported the pulse A and the pulse B of two groups of phase phasic differences, 90 degree, can judge the direction of rotation by this two group pulse.Be set in positive rise and enter and catch triggering, micro controller system 4 judges that pulse is in advance or lags behind to B in the A pulses, takes this further to judge the hand of rotation of rotary encoder.Among Fig. 3 a, B was a low level when A rising edge of a pulse form to trigger, this moment A than B ultrasonic before 90 degree, know coder thus for just changeing, among Fig. 3 b, the A rising edge of a pulse forms that B is a high level when triggering, this moment, A was than B quadrature lagging, knew that thus coder is counter-rotating.
The pwm signal product process is referring to Fig. 5.Micro controller system 4 at first judges according to the state of master cock 8 whether fine setting opens, if do not open fine setting, 4 responses of micro controller system derive from the automatically regulating signal of opto-electronic pickup 1, correspondingly produce PWM1, and is that final pwm control signal ripple is with output with PWM1; If opened fine setting, except producing PWM1, micro controller system 4 also generates △ PWM according to changeing coder 5.The cooresponding PWM variable quantity of signal A individual pulse is △ pwm, and when counted number of pulses was N, total PWM converted quantity △ PWM was N * △ pwm.Micro controller system 4 is judged turning to just changeing still counter-rotating of rotary encoder 5, correspondingly adds or deducts △ PWM on the basis of automatically regulating PWM1 signal, and PWM1 ± △ PWM is exported as final PWM ripple.The maxim that can set pwm signal permission variation range is MAX, and minimum value is MIN, then must satisfy MIN≤PWM1 ± △ PWM≤MAX.
Control method of the present invention is applicable to all backlight circuits with constant pressure source control, obviously, except can be used for the brightness regulation of the instrument carrier panel backlight that light-emitting diode forms, equally also can be applied in LCD (LCDs) module backlight.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (11)
1. auto meter display brightness control apparatus is characterized in that comprising:
Opto-electronic pickup, the brightness transition that is used for the surround lighting that will sense are corresponding electric signal output;
Treater is used for the electric signal that the response light electric transducer is exported, the output control signal corresponding;
Power transfer module is used for the control signal that answer processor is exported, and output correspondent voltage signal is to indicating instrument.
2. auto meter display brightness control apparatus as claimed in claim 1, it is characterized in that: described treater comprises A/D converting unit and pulse width modulator, the electric signal of described A/D converting unit response light electric transducer output, the output digital signal corresponding is to pulse width modulator, and described pulse width modulator produces corresponding PWM ripple according to digital signal and exports the feedback end of power transfer module to.
3. auto meter display brightness control apparatus as claimed in claim 2 is characterized in that: the voltage signal output end of described power transfer module is coupled to the light source of indicating instrument.
4. auto meter display brightness control apparatus as claimed in claim 2, it is characterized in that: described device also comprises filter circuit and amplifying circuit, the input end of described filter circuit connects the mouth of opto-electronic pickup, mouth connects the input end of amplifying circuit, and the mouth of described amplifying circuit connects the A/D converting unit.
5. as each described auto meter display brightness control apparatus in the claim 2 to 4, it is characterized in that: described device also comprises coder, the input end of described coder is used to accept input, mouth output two pulse signals is to treater, described treater is determined the size and the symbol of changing value according to two pulse signals, and with the new PWM ripple of output after the value of current PWM ripple and the changing value addition.
6. auto meter display brightness control apparatus as claimed in claim 5, it is characterized in that: described device also comprises master cock, described master cock is coupled to treater, and the two pulse signals that described treater is exported coder according to the state of master cock responds or shields.
7. auto meter display lightness regulating method is characterized in that may further comprise the steps:
The brightness of A1, opto-electronic pickup induced environment light is also exported corresponding electric signal;
B1, treater be according to the size of electric signal, the output control signal corresponding;
C1, power transfer module to indicating instrument, are regulated the display brightness of indicating instrument according to control signal output correspondent voltage signal.
8. auto meter display lightness regulating method as claimed in claim 7 is characterized in that: described step B1 may further comprise the steps:
B11, between the maxim of predefined electric signal and minimum value, mark off N interval, each interval corresponding a kind of PWM ripple;
B12, the electric signal in the steps A 1 is converted to digital signal;
B13, the pairing interval of judgement digital signal, thus draw the cooresponding PWM ripple of this digital signal;
B14, export this PWM ripple to power transfer module.
9. auto meter display lightness regulating method as claimed in claim 8 is characterized in that: in described step B11, described N interval PWM ripple is arithmetic progression or linear.
10. auto meter display lightness regulating method as claimed in claim 8 is characterized in that: in described step C1, described voltage signal is outputed to the brightness of the light source of indicating instrument with the control light source.
11., it is characterized in that also comprising trim step as each described auto meter display lightness regulating method in the claim 8 to 10:
D1, coder are accepted user's input;
E1, according to user's input, export corresponding two pulse signals to treater;
F1, described treater determine the size and the symbol of changing value according to two pulse signals, and with the new PWM ripple of output after the value of current PWM ripple and the changing value addition;
G1, power transfer module to indicating instrument, are regulated the display brightness of indicating instrument according to new PWM ripple output correspondent voltage signal.
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| CN2007100757401A CN101367353B (en) | 2007-08-14 | 2007-08-14 | Apparatus and method for governing display lightness of automobile instrument |
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| CN101814275A (en) * | 2010-02-26 | 2010-08-25 | 天津七一二通信广播有限公司 | Automatic brightness-regulating system for CIR operation display terminal |
| CN102248922A (en) * | 2011-03-09 | 2011-11-23 | 奇瑞汽车股份有限公司 | Automobile backlight control system and control method thereof |
| CN102328592A (en) * | 2011-07-28 | 2012-01-25 | 奇瑞汽车股份有限公司 | Low-temperature heating system of liquid crystal display screen of automotive combined instrument |
| CN103010093A (en) * | 2012-12-10 | 2013-04-03 | 奇瑞汽车股份有限公司 | Backlight processing method of automobile combination instrument |
| CN103578448A (en) * | 2012-07-24 | 2014-02-12 | 上海博泰悦臻电子设备制造有限公司 | Method and device for adjusting screen brightness of vehicle-mounted device |
| CN104464650A (en) * | 2014-12-29 | 2015-03-25 | 合肥宝龙达光电技术有限公司 | Automatic control system and method for display brightness |
| CN104661376A (en) * | 2013-11-21 | 2015-05-27 | 上海航空电器有限公司 | Intelligent driving module of luminous block and driving method of driving module |
| CN106409235A (en) * | 2015-08-03 | 2017-02-15 | 深圳前海智云谷科技有限公司 | Vehicle HUD backlight adjusting method and apparatus |
| CN107084351A (en) * | 2016-02-15 | 2017-08-22 | 马自达汽车株式会社 | Vehicle lighting control device |
| CN107571736A (en) * | 2017-09-16 | 2018-01-12 | 南京中高知识产权股份有限公司 | The method of work of display screen is controlled in intelligent automobile and intelligence |
| CN108551701A (en) * | 2018-04-28 | 2018-09-18 | 江苏天楹之光光电科技有限公司 | A kind of adaptive light adjusting system |
| CN109395941A (en) * | 2018-11-15 | 2019-03-01 | 无锡荣恩科技有限公司 | The method of the robot speed of service is adjusted under painting environments in real time |
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| KR100988977B1 (en) * | 2003-06-18 | 2010-10-20 | 한라공조주식회사 | Method for light controlling of instrument board of vehicle |
| CN2848634Y (en) * | 2005-10-20 | 2006-12-20 | 浙江吉利汽车研究院有限公司 | Brightness regulating device of automobile instrument lamp |
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| CN101814275B (en) * | 2010-02-26 | 2012-02-15 | 天津七一二通信广播有限公司 | Automatic brightness-regulating system for CIR operation display terminal |
| CN101814275A (en) * | 2010-02-26 | 2010-08-25 | 天津七一二通信广播有限公司 | Automatic brightness-regulating system for CIR operation display terminal |
| CN102248922A (en) * | 2011-03-09 | 2011-11-23 | 奇瑞汽车股份有限公司 | Automobile backlight control system and control method thereof |
| CN102328592A (en) * | 2011-07-28 | 2012-01-25 | 奇瑞汽车股份有限公司 | Low-temperature heating system of liquid crystal display screen of automotive combined instrument |
| CN103578448A (en) * | 2012-07-24 | 2014-02-12 | 上海博泰悦臻电子设备制造有限公司 | Method and device for adjusting screen brightness of vehicle-mounted device |
| CN103010093A (en) * | 2012-12-10 | 2013-04-03 | 奇瑞汽车股份有限公司 | Backlight processing method of automobile combination instrument |
| CN104661376A (en) * | 2013-11-21 | 2015-05-27 | 上海航空电器有限公司 | Intelligent driving module of luminous block and driving method of driving module |
| CN104464650A (en) * | 2014-12-29 | 2015-03-25 | 合肥宝龙达光电技术有限公司 | Automatic control system and method for display brightness |
| CN106409235A (en) * | 2015-08-03 | 2017-02-15 | 深圳前海智云谷科技有限公司 | Vehicle HUD backlight adjusting method and apparatus |
| CN107084351A (en) * | 2016-02-15 | 2017-08-22 | 马自达汽车株式会社 | Vehicle lighting control device |
| CN107571736A (en) * | 2017-09-16 | 2018-01-12 | 南京中高知识产权股份有限公司 | The method of work of display screen is controlled in intelligent automobile and intelligence |
| CN108551701A (en) * | 2018-04-28 | 2018-09-18 | 江苏天楹之光光电科技有限公司 | A kind of adaptive light adjusting system |
| CN109395941A (en) * | 2018-11-15 | 2019-03-01 | 无锡荣恩科技有限公司 | The method of the robot speed of service is adjusted under painting environments in real time |
| CN109395941B (en) * | 2018-11-15 | 2020-04-21 | 无锡荣恩科技有限公司 | Method for adjusting running speed of robot in real time in spraying environment |
| CN113928458A (en) * | 2021-11-22 | 2022-01-14 | 江苏宗申车业有限公司 | Liquid crystal instrument display with intelligent control system for passenger tricycle |
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