CN103786687A - Slide control method of automobile rain light sensor - Google Patents
Slide control method of automobile rain light sensor Download PDFInfo
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- CN103786687A CN103786687A CN201410045794.3A CN201410045794A CN103786687A CN 103786687 A CN103786687 A CN 103786687A CN 201410045794 A CN201410045794 A CN 201410045794A CN 103786687 A CN103786687 A CN 103786687A
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Abstract
The invention relates to a slide control method of an automobile rain light sensor. The slide control method comprises the following steps of collecting an infrared signal value with the significant digit of n bit, and setting the initial infrared signal value as X1= 2<n>/2 +a, wherein the a ranges from +200 to -200; setting that M infrared signal values are collected in a collection cycle T and the collected m<th> infrared signal value is Xm, and performing iteration processing on the M infrared signal values when the M+1 infrared signal values are received to obtain the infrared signal value Xm: Xm=Xm+1, wherein m ranges from 1 to M; resolving m/2 signal value in the Xm of M infrared signal values; finding the maximum value y1 and the minimum value y0 in the m/2 signal value, and calculating a differential signal dynamic change value RainDiff_Av=y0-y1 or RainDiff_Av=y1-y0; regulating modes of a windscreen wiper according to the differential signal dynamic change value. By means of the slide control method of the automobile rain light sensor, comfort of action and smoothness of wiping speed of the windscreen wiper are achieved. Under the condition that rainfall does not change greatly, the current wiping grade can be kept for a long time, and therefore, clear enough view of drivers can be ensured to the largest extent.
Description
Technical field
The present invention relates to rainfall light sensor control field, particularly the smooth control method of rainfall light sensor for a kind of automobile.
Background technology
Existing rainfall light sensor (English name Rain Light Sensor is called for short RLS), adopts Infrared to pass through the mechanism with two passage optical prisms mostly in the market, according to the total reflection principle of light, and design lens angle and size.The transparent silica gel that has the about 1mm of one deck left and right between prism and Windshield, in order to deaeration, reduces the impact that Infrared is reflected in communication process.
According to the condition that produces total internal reflection in light transmition process,
In formula: i is the angle of total reflection; N is the ratio of refraction of glass; The ratio of refraction (medium in this formula is respectively air n '=1, and silica gel-n ' is about 1.5) that n ' is glass adjacent media.In the time that windscreen surface has raindrop, the condition that produces total internal reflection is changed, the Infrared of part reflects away, thereby cause the Infrared signal receiving to weaken, the RLS software algorithm of this principle of design, according to the Infrared signal power receiving, and then the size of judgement rainfall, the different speed of scraping carried out thereby indirectly control wiper.
Due to the RLS with optical prism design, the thickness of thickness of glass and silica gel is had to strict requirement, in order to meet the condition (formula-1) that produces total internal reflection.This is just harsher to the requirement of mounting condition, higher to the coherence request of software algorithm parameter, and in actual production and fitting process, has increased many uncertain factors; Need to do a large amount of roads and have a try and test early stage, demarcates and mate a large amount of parameters, and to meet the front windshield of different curvature and thickness, the wearing and tearing of the aging and rain shaving blade of later stage glass etc. all can cause the change of total reflection condition, and then affect the serviceability of RLS.Along with the decline of the aging and cleanliness level of glass, the function of RLS also will be affected.In addition, owing to producing the needs of total reflection condition, the design of prism has caused the RLS thickness of this principle design larger, and volume is larger, has limited the upgrading of subsequent product; And the main flow of depot's requirement at present RLS product is towards the direction upgrading of micro-miniaturisation and updates, so the RLS of large volume size is not suitable for follow-up model change.
In addition, existing rainfall light sensor in the time working rainy day, often there will be control wiper to scrape speed not steady, unsmooth, discontinuous phenomenon.What is called is not steady, is exactly wiper scraping in process, neglect fast neglect slow; Unsmooth, refer to that wiper is in the time scraping, can not be according to the variation of rainfall size, pulsation-free is realized windscreen wiper and is scraped fast switching action; Discontinuous, refer to wiper when work, scraping fast grade while switching, the phenomenon such as react not prompt enough or reaction is too fast, and delay time is long or too short; Even some product is not in the situation that raining, windscreen wiper also has misoperation and produces.
Summary of the invention
The technical problem to be solved in the present invention is: solving windscreen wiper, to scrape speed not steady, unsmooth, discontinuous problem.
The invention provides the smooth control method of a kind of automobile rainfall light sensor, by method of the present invention, realize the happy property of wiper action and scrape fast ride comfort, and, change little in the situation that at rainfall, can remain on for a long time current wiper grade; Thereby, to a great extent, guaranteed that chaufeur has enough the visual field clearly.
The technical solution adopted for the present invention to solve the technical problems is: the smooth control method of rainfall light sensor for a kind of automobile, comprises the following steps:
1) described sensor comprises emissive source and receptor, and described emissive source sees through windshield and outwards launches infrared signal, and receptor receives the infrared signal that the object outside windshield is reflected back;
2) the infrared signal value of infrared signal described in Real-time Collection, the significance of establishing described infrared signal value is n bit, the dynamic change scope of the infrared signal value when expanding rainfall detection, arranges initial infrared signal value
3) establish in a collection period T and gather altogether M infrared signal value, m the infrared signal value collecting is X
m, in the time receiving M+1 signal value, M infrared signal value before carried out to iterative processing, obtain infrared signal value X
m: X
m=X
m+1, wherein m=1～M; The dynamic change of the infrared signal value gathering in this process is considered as reacting to the eigenwert of current rainfall size variation, can monitors in real time, continuously the dynamic change situation of rainfall signal value;
4) get M infrared signal value X of step 3)
min M/2 signal value;
5) find out maxim y1 and the minimum value y0 in M/2 the signal value of obtaining in step 4), calculate differential signal dynamic change value RainDiff_Av:RainDiff_Av=y1-y0;
6) regulate wiper mode according to described differential signal dynamic change value RainDiff_Av.
Therefore, at least, in a collection period T, initial infrared signal value is a constant, and certainly, due to the interference of signal noise, the situation that initial infrared signal value fluctuates up and down at this constant also belongs to protection scope of the present invention.
The present invention can for the RLS based on different rainfall detection principle designs, for example, not adopt prism, directly receives the RLS of raindrop reflects infrared light.Generally, this RLS has the transparent silica gel of one deck 1mm left and right below glass, used as deaeration; The mode that adopts Infrared directly to transmit and receive, by multichannel infrared light emission source transmitting infrared light, an infrared light receptor receives the infrared signal reflecting, between emissive source and receptor, do not there is prism, the infrared signal receiving is the Infrared being directly reflected back by object (being mainly raindrop), method of the present invention, by judgement being received to the dynamic change situation of infrared signal, is reacted rainfall size, and then indirectly controls the wiper speed of wiper.Certainly, the present invention also can be for comprising the RLS that utilizes total reflection principle design with optical prism.
Described collection period T is the time from the rain shaving blade infrared signal overlay area that just the described emissive source of process has been launched to rain shaving blade stop position.Like this, the differential signal dynamic change value collecting under different rainfall sizes, all can the current rainfall size of real-time response.
Described wiper mode at least comprises stop mode, intermittent mode, low speed continuous mode and fast mode, and wherein the value mode of step 4) is: current wiper mode is for stopping or when intermittent mode, getting the M/2+1～M infrared signal value; When current wiper mode is low speed continuous mode, get M/2 infrared signal value of interlude; When current wiper mode is fast mode, M/2 the infrared signal value that the signal collecting while getting the infrared signal overlay area of just having launched through emissive source from rain shaving blade starts.Under different patterns, M infrared signal value carried out to different packet transaction, make to enter the infrared signal value current rainfall size of real-time response more of subsequent treatment.
Under different patterns, be provided with adjustment of sensitivity: obtain sensitivity level according to user's input, each sensitivity level is to there being the bivariate table of the reaction windscreen wiper grade output valve relevant with last windscreen wiper grade point to current executing arithmetic output level value; Search bivariate table and obtain the grade point of final output-response windscreen wiper speed according to current executing arithmetic output valve and last windscreen wiper grade point.By the output windscreen wiper grade point of tabling look-up, make chaufeur can significantly experience the variation of windscreen wiper wiper speed.
Windscreen wiper grade comprises the pattern of splashing, and in specific time, when Continuous accumulation differential signal dynamic change value RainDiff_Av sum exceedes a fixed value, exports the pattern of splashing.
By the dynamic change situation to ambient light, judge whether current windscreen wiper will carry out wiper action: in the time that ambient light rate of change exceedes a fixed value, forbid the windscreen wiper action in this time period; Otherwise, carry out normal windscreen wiper action.
The invention has the beneficial effects as follows, the present invention, without under prism structure, adopts differential signal dynamic change value as core processing mode of the present invention, can scrape the speed of speed according to rainfall size dynamic change trend reaction windscreen wiper in real time like this.
Initial signal value is arranged on to the intermediateness of dynamic range, dynamic change wide ranges, is suitable for the front windshield of different-thickness and different light transmittances.
In step 4), take the design to multiple signal values grouping value processing modes, reduce the impact of rain shaving blade on infrared reception signal, prevent from when the infrared signal value collecting from passing through RLS search coverage by rain shaving blade producing.
In step 5), to grouping, the signal value after value directly adopts the design of " value " processing mode, is convenient to retrieve the subtle change of current rainfall, strengthens the sensitieness of raindrop detection.
Rain shaving blade stop position signal enables to trigger rainfall detection algorithm call-by mechanism, guarantee the data that collect be from rain shaving blade after RLS search coverage, the rainfall size variation signal value that Real-time Collection arrives.
Adjustment of sensitivity design realizes by searching bivariate table, makes driver and crew can significantly experience the variation of windscreen wiper speed, is conducive to driver and crew's direct feel regulating effect.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structured flowchart of smooth control method of the present invention.
Fig. 2 be in the embodiment of the present invention based on rainfall detection principle schematic.
Fig. 3 is the structural representation of the sensor that adopts in the embodiment of the present invention.
Fig. 4 is windscreen wiper wiper area schematic.
Fig. 5 is windscreen wiper level status transition diagram in the specific embodiment of the present invention.
Fig. 6 is the time dependent schematic diagram of infrared signal value Xm receiving in the specific embodiment of the present invention.
Fig. 7 is that in the specific embodiment of the present invention, differential signal dynamic change value RainDiff_Av and windscreen wiper are scraped fast actual act and be related to schematic diagram.
In figure 1, installation of sensors position, 2, the maximum position of rain shaving blade motion, 3, rain shaving blade stop position, 4, raindrop, 5, Windshield, 6, emissive source, 7, receptor, 8, transparent silica gel.
The specific embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, and basic structure of the present invention is only described in a schematic way, and therefore it only shows the formation relevant with the present invention.
As shown in Figure 2, the embodiment of the present invention runs into the specular principle of obstacle based on light, and the Dynamic IR signal intensity situation collecting is processed, and has the transparent silica gel 8 of one deck 1mm left and right below glass, used as air-discharging.As the rain sensor of Fig. 3, eight emissive source 6 composition annulars are around the receptor 7 that is positioned at center.Adopt the mode that directly transmits and receives Infrared, infrared light is launched in infrared light emission source, You Ba road 6, an infrared light receptor 7 receives the infrared signal reflecting, between emissive source 6 and receptor 7, do not have prism, the infrared signal receiving is the Infrared being directly reflected back by object (being mainly raindrop).In the time that the external world does not have raindrop landing, the Infrared of transmitting almost whole scioptics transmissions has been gone out; When there is foreign matter in the external world, raindrop landing etc., the Infrared that transmission is gone out will be reflected back, and be received by infrared receiving tube.
Eight emissive sources 6 shown in Fig. 3 can be divided into two groups, every group of each four emissive sources 6, as shown in Figure 2, in the time there is no raindrop, two groups of emissive source transmitting Infrared signals, 180 ° of phase phasic differences, the infrared signal value on the both sides that receptor 7 receives maintains in the scope of setting dynamically.
In the time having raindrop to drop to the left side, it is large that the infrared signal value that receptor 7 receives from the left side becomes, and remaining unchanged of the right, has caused the overall rising of signal; Pass through afterwards the Balance Treatment of MCU, for the signal that keeps receptor 7 to receive is dynamical equilibrium, so the emissive source 6 on the right will increase emissive porwer, make it receive signal value and maintain in the dynamic range of setting; But when raindrop drop on glass, have the Infrared signal of part to reflect away, the dynamical equilibrium maintaining before making is broken, and has caused and has received weakening of signal, be that signal value declines, this has just caused, and the infrared signal value receiving in raindrop decline process is dynamic to rise or declines.
First the present embodiment obtains in real time dynamic infrared signal value from the infrared signal receiver of bottom hardware, sampling period is 20ms, signal value significance is 10bit, initial infrared signal value maintains 512 left and right, like this variation range of differential signal dynamic change value be ± 512, sampled value dynamic change wide ranges, can adapt to the Windshield of different-thickness (4mm～6mm) and light transmittance, than having, the software algorithm comformability of prism product is stronger, more stable.As shown in Figure 6, infrared signal value X
mfluctuate up and down in initial signal value.
Based on above advantage, after the collection of a collection period T, finally obtain the infrared signal value X of M the extraneous rainfall size variation of reaction
m, in the time receiving (M+1) individual infrared signal value, to M infrared signal value X before
mtake " iteration " to process, X
m=X
m+1(wherein, m=1～M), that is: the signal value of first variable is given up, give first variable by second variate-value assignment, the 3rd variate-value assignment given second variable, the 4th variate-value assignment given the 3rd variable, and by that analogy, (M+1) individual variable signal value assignment is given M variable.Thereby dynamic continuity and the stationarity of rainfall signal sampling value on the signal sampling time, are guaranteed.In the time not raining in the external world, the differential signal dynamic change value RainDiff_Av(RainDiff_Av=y1-y0 of this M infrared signal value) will substantially maintain in 4, even the interference that has ambient light to change, its differential signal dynamic change value also can be controlled in 6 left and right; In the time that the external world is rainy, the differential signal dynamic change value of this M infrared signal value, by the dynamic change large change that has different degree or that diminish, then, is being done following steps processing:
Generally speaking, rain shaving blade orbit period is 45 revs/min at low speed continuous mode, and fast mode is 55 revs/min.Both single wiper run durations are 325ms and 459ms.As shown in Figure 4, illustrate the highest distance position 1 of rain shaving blade motion in figure, camber line represents the path of motion on rain shaving blade summit, has covered infrared signal surveyed area position 3.Just trigger algorithm process of the present invention through the infrared signal overlay area of emissive source transmitting to stop position 2 from rain shaving blade; The differential signal dynamic change value collecting under different rainfall like this, all can the current rainfall size of real-time response.Be just a collection period T through RLS search coverage to rain shaving blade stop position from rain shaving blade, the M collecting an infrared signal value; Based on the signal receiving above, will be in this M variable packet transaction, according to the windscreen wiper grade point in a upper moment, in the present embodiment, windscreen wiper grade point was divided into 8 grade points (pattern 0～7):
When stop mode (pattern 0), get M/2 ((M/2+1)～M) variable;
When intermittent mode or low speed continuous mode (pattern 1～5), M/2 (7～16) variable in the middle of getting;
When fast mode (pattern 6 and 7); Get M/2 (1～M/2) variable;
In some system, rain shaving electrical machine only has 4 grade points (pattern 0～4), can do following grouping:
When stop mode (pattern 0), get M/2 ((M/2+1)～M) variable;
When intermittent mode or low speed continuous mode (pattern 1～2), M/2 (7～16) variable in the middle of getting;
When fast mode (mode 3), get M/2 (1～M/2) variable;
Using M/2 the variate-value that grouping obtains above as the input variable of asking differential signal dynamic change value.
The object of doing like this, when current windscreen wiper state is stop mode, last infrared signal value that each run algorithm arrives according to current detection, i.e. M signal value, searches forward the input variable of M/2 infrared signal value while calling as this algorithm successively; Current windscreen wiper state is the continuous mode of motion of low speed, M/2 value in the middle of being suitable in M gathers infrared signal value, interfering signal can prevent windscreen wiper wiper RLS search coverage time is used, can reduce again windscreen wiper and stop time, RLS does not receive danger signal enable bit in time, and extends the allocating time of algorithm; Current windscreen wiper state is fast mode, the signal collecting during just through the infrared signal overlay area of emissive source transmitting from rain shaving blade, gathers backward M/2 infrared signal value, and front M/2 infrared signal value is as the current input signal values that calls algorithm.
Afterwards, this M/2 variable being done to " value " processes: find out maxim y1 and minimum value y0, then do the formula computing of RainDiff_Av=y1-y0, obtain differential signal dynamic change value RainDiff_Av.The object of doing is like this dynamic change situation of Real-Time Monitoring infrared signal value, the dynamic change of twice signal value is considered as reacting to the eigenwert of current rainfall size variation, has embodied this algorithm and has treated the advantage of signal processing with a certain discrimination.
Based on above step, the real-time characteristic value using the differential signal dynamic change value obtaining as rainfall monitoring.First, the large raindrop that overtake are detected, in the time that vehicle walks to certain section of distance, down-pour very unexpectedly suddenly, differential signal dynamic change value is processed in now software algorithm operation, be defined in t ms, its differential signal dynamic change value sum of Continuous accumulation exceedes a fixed value, and output " splashing " pattern, enters " splashing " pattern wiper immediately, the output windscreen wiper wiper enable bit of " splashing ", maintains 4s backed off after random.Can prevent that like this vehicle is entering or go out when overhead, have suddenly water " to splash " and under, shelter from the sight line of chaufeur and affect its driving safety, the generation avoiding traffic accident.
In the time detecting above pattern, in the time that cumulative differential signal dynamic change value does not exceed the fixed value of setting, but differential signal dynamic change value has exceeded 9, now enters intermittent mode, i.e. single wiper, output wiper grade point 1.Under this pattern, chaufeur can be according to the driving habit of oneself, and the moment is adjusted sensitivity, give like this chaufeur with fixed cycle wiper, adjust after sensitivity, can obviously experience the difference of the wiper sensitivity of same rainfall, the length in reaction time in order to checking.Strengthen so the autonomous selectivity of chaufeur, improved safety and the traveling comfort driven.
Entering after intermittent mode 0, if rainfall crescendo, according to algorithm operation result, when the differential signal dynamic change value of infrared signal value continuous more than twice be greater than 9, will enter continuous mode 1, output wiper grade point 1; Under this pattern, can be transitioned into continuous mode from intermittent mode by pulsation-free, rain shaving blade no longer includes the phenomenon generation of pause.
Under continuous mode 1, show when current rain condition is to be engraved in, this algorithm will enable to open passing light signal, and for pointing out meeting vehicle, rainy day careful driving, improves the safety of driving.
" splashing " patterns of above two kinds and intermittently, continuous mode all in ungratified situation, continues after 30s, RLS enters Idle pattern, output wiper grade point 0; Simultaneously, when in algorithm operational process, from continuous mode, exit until 3s after stopping left and right, will again " Tear " wiper once, export wiper grade point 1, prevent Windshield top rain shaving blade temporarily not wiper to raindrop stay, affect pilot's line of vision, thereby improved driving enjoyment, safety and the traveling comfort of chaufeur.
Under moderate rain and heavy rain pattern, for fast mode can be entered into as soon as possible, reach high response speed, so, will be under 1 continuous mode at state, judge that differential signal dynamic change value is greater than 30, and continue more than 2 times, directly to enter continuous mode class 4 output wiper grade point 4; Judge that its differential signal dynamic change value is greater than 70 simultaneously, and continue more than 2 times, directly to enter continuous mode class 5, output wiper grade point 5.
Under intermittent mode, if last windscreen wiper wiper grade is 1, differential signal dynamic change value is greater than 9, and continues more than 2 times, directly to enter continuous mode 2, output wiper grade point 2; Or under intermittent mode, continuous wiper grade is 1, and continue more than 3 times, directly to enter continuous mode 2 output wiper grade point 2.Continuous mode 2 times, judge that differential signal dynamic change value is between [10,80], and continue more than 3 times, directly enter continuous mode 3, output wiper grade point 3.Continuous mode 3 times, when differential signal dynamic change value is between [20,85], and lasting number of times is more than 3 times time, directly enters continuous mode 4, output wiper grade point 4.Under this pattern, there are two kinds of approach that enter continuous mode 5, one is when differential signal dynamic change value is between [25,90], and continues when more than 3 times, directly to enter, output wiper grade point 5; Another kind is, continuous mode 1 time, judges and directly enters in the situation of continuous mode 4, is greater than 80 in dynamic difference signal intensity value, directly enters continuous mode 5, output wiper grade point 5.The condition that enters fast mode 6 has two kinds of conditions equally, and one is in the time of continuous mode 5, when differential signal dynamic change value is greater than 45, and continues more than 2 times, to enter fast mode 6 output wiper grade point 6; Another kind of condition is in the situation that being judged to be directly to enter fast mode, when differential signal dynamic change value is greater than 65, directly enters fast mode 6, output wiper grade point 6.In order to control unlikely being withdrawn into very soon under low speed continuous mode under fast mode, neglect fast neglecting slowly to chaufeur sensation, unsmooth sense, so, in the situation that entering fast mode 6, entering fast mode 7 is not just the thing of difficulty again, when differential signal dynamic change value is between [45,200], continue more than 3 times, just directly enter fast mode 7, output wiper grade point 7.
The object of doing is like this to shorten windscreen wiper to enter the time gap of fast mode, thereby improves the response time of product, and the unlikely visual field that affects chaufeur, makes driver and crew feel that the function of intelligent windscreen wiper sensor is more humane.
Above step is to introduce to understand from rudimentary pattern and enter the Rule of judgment of fine mode, with next be to introduce to exit to rudimentary pattern from fine mode, until stop, entering the Rule of judgment of Idle pattern.The principle of design of Rule of judgment is, avoids under onesize rainfall road conditions, and the wiper grade of windscreen wiper is switched frequently up and down, to driver's sensation neglect fast neglect slow, unsmooth, discontinuous.
Adopt the design concept of " great-jump-forward " withdrawing mode, when the external world does not have raindrop to drop on Windshield, windscreen wiper is in current a certain level status, and the continuous differential signal dynamic change value that detects is less than 9, when more than 4 times, directly retreat to the pattern more than differing 2 grades with present mode; Under this pattern, after of short duration wiper, enter stop mode.
As described in Figure 5, in the time of pattern 1, when condition is satisfied, can directly enter pattern 4 or pattern 5; Equally, in the time of pattern 6, in the time that meeting, condition directly retreats to mode 3.
The object of doing is like this to reduce the wiper number of times of windscreen wiper, improves the response time of product, gives chaufeur a kind of rapid-action sensation; Reduce the rate of wear of rain shaving blade simultaneously, delayed the life-span that scratches of Windshield, to a certain extent, reduced the consumption of electric weight, saved the energy, reduced the quantity discharged of vehicle exhaust.
Consider the infrared signal value of the reaction rainfall size variation obtaining from infrared receiving sensor, rainy while being dropped in sensor surveyed area, its signal intensity feature is unsettled, change up and down in initial signal value 512, so, in the time processing this class signal, need to adopt the mode processing of probability statistics, in eigenwert maintains a certain scope time, to remain on this windscreen wiper level status, when rainfall changes very weak, differential signal dynamic change value changes lower than initial set value, while continuing more than 2～3 times, just exit current grade point, even directly exit to stop mode.This has met the probability statistics concept in rainfall landing region to a certain extent, i.e. rainfall landing is how many.
Consider based on above design, first from the explanation of fast mode degradation.
Exit to 6 from fast mode 7, rank reduces first-class level, when differential signal dynamic change value is less than 20, and exits to fast mode 6 continuously output wiper grade point 6 when more than 4 times.Why needing differential signal dynamic change value continuous 4 to be less than 20 and just exit, is because in the statistics of signal intensity, have lower than 15 time, but major part is all greater than 25, so, in statistic processes, be greater than at 25 o'clock, by counter O reset; Be less than at 20 o'clock, will continue to add up, until exit current state.
At fast mode 6, can pass through continuous mode 5,4, directly retreat to low-speed mode 3; Rule of judgment is that differential signal dynamic change value is less than 15, and continuous more than 3 times, exits to low speed continuous mode 3 output wiper grade point 3.At low speed continuous mode 3, Rule of judgment meets differential signal dynamic change value and is less than 12, and continuous more than 4 times, exits to continuous mode 2 output wiper grade point 2.In like manner, meet and exit continuous mode 2, and 1 condition, be respectively that differential signal dynamic change value is less than 9, and continuous 4 times and 3 times.In the time having continuous mode to exit to stop mode, time delay is after 2 seconds, at wiper once, the object of doing be like this prevent from not having wiper to the rainwater of Windshield top flow down, blocked the sight line of chaufeur.Equally, entering before tunnel, be under intermittent mode, enter after tunnel mode, after time delay 1s, trigger wiper once, output wiper grade point 1.Prevent from remaining in rainwater on Windshield because of the surveyed area at sensor not, or do not meet and start wiper condition and do not scrape, hinder driver's seat.Under stop mode, continue in 30s raindrop not detected, enter Idle pattern, be under this pattern, sensor sense cycle is by according to the setting value real-time sampling of sensitivity.This is can directly exit to low speed continuous mode 3 from fast mode 6; If current windscreen wiper state is in continuous mode 5, need through continuous mode 4, just can enter continuous mode 3,2 and 1, until exit to stop mode 0.
Draw windscreen wiper wiper grade point by above calculation step, then output after state smoothing conversion.This value has formed sensitivity design with last historic state value together with sensitivity signal value, and the end value of current computing output has formed table look-up abscissa and the ordinate of bivariate table jointly with the windscreen wiper state value of last computing output.In the time that the function of level Four sensitivity realizes, after all tabling look-up by this bivariate table, obtain.From sensitivity 1 grade (the most weak) to 4 grades of sensitivitys (the strongest), the windscreen wiper grade point of algorithm output is than exceed two grade points when sensitivity is 1, equally, while being down to 1 grade of sensitivity by 4 grades of sensitivitys, algorithm output level value is than low 2 grades in the time that sensitivity is 4 grades.The windscreen wiper state grade value obtaining after tabling look-up is last windscreen wiper grade output valve.
Above, the algorithm design overall principle is " wide-in and strict-out ", only in the time of adjustment of sensitivity, according to the sensitivity information value (1～4 four sensitivity level) of input, by searching the bivariate table grade point that prior demarcation is good, 1～3 grade can directly rise or decline.
As seen from Figure 7, along with the enhancing of rainfall differential signal dynamic change value, windscreen wiper is scraped speed also along with accelerating; On the contrary, along with weakening of rainfall differential signal dynamic change value, windscreen wiper is scraped speed also can be thereupon slack-off, and in the time that rainfall signal intensity is relatively stable, windscreen wiper is scraped speed and will be stabilized in corresponding speed range.
In addition, consider that the light power in daytime and evening differs greatly, thus the adjusting of sensitivity is arranged to the power with reference to light signal, at the ambient light signal value receiving during lower than particular value, 1 grade of Sensitirity va1ue automatic-ascending.
In Windshield certain distance, mobile object can make infrared reception signal have strong and weak variation equally, because ambient light signal is also along with there being the variation of evident regularity, can distinguish with the variation of normal environment light, therefore, by the dynamic change situation to ambient light, judge whether current windscreen wiper will carry out wiper action: in the time that ambient light rate of change exceedes a fixed value, forbid the windscreen wiper action in this time period; Otherwise, carry out normal windscreen wiper action.Reference environment light signal, can filtering in the time not raining, what RLS was caused by foreign matter scrapes action by mistake.
Claims (6)
1. a smooth control method for rainfall light sensor for automobile, is characterized in that comprising the following steps:
1) described sensor comprises emissive source and receptor, and described emissive source sees through windshield and outwards launches infrared signal, and receptor receives the infrared signal that the object outside windshield is reflected back;
2) the infrared signal value of infrared signal described in Real-time Collection, the significance of establishing described infrared signal value is n bit, and initial infrared signal value is set
3) establish in a collection period T and gather altogether M infrared signal value, m the infrared signal value collecting is X
m, in the time receiving M+1 signal value, M infrared signal value before carried out to iterative processing, obtain infrared signal value X
m: X
m=X
m+1, wherein m=1～M;
4) get M infrared signal value X of step 3)
min M/2 signal value;
5) find out maxim y1 and the minimum value y0 in M/2 the signal value of obtaining in step 4), calculate differential signal dynamic change value RainDiff_Av:RainDiff_Av=y1-y0;
6) regulate wiper mode according to described differential signal dynamic change value RainDiff_Av.
2. the smooth control method of rainfall light sensor for automobile as claimed in claim 1, is characterized in that: described collection period T is the time from the rain shaving blade infrared signal overlay area that just the described emissive source of process has been launched to rain shaving blade stop position.
3. the smooth control method of rainfall light sensor for automobile as claimed in claim 1, it is characterized in that: described wiper mode comprises stop mode, intermittent mode, low speed continuous mode and fast mode, wherein the value mode of step 4) is: current wiper mode is for stopping or when intermittent mode, getting the M/2+1～M infrared signal value; When current wiper mode is low speed continuous mode, get M/2 infrared signal value of interlude; When current wiper mode is fast mode, M/2 the infrared signal value that the signal collecting while getting the infrared signal overlay area of just having launched through emissive source from windscreen wiper starts.
4. the smooth control method of rainfall light sensor for automobile as claimed in claim 1, it is characterized in that: under different patterns, be provided with adjustment of sensitivity: obtain sensitivity level according to user's input, each sensitivity level is to there being the bivariate table of the reaction windscreen wiper grade output valve relevant with last windscreen wiper grade point to current executing arithmetic output level value; Search bivariate table and obtain the grade point of final output-response windscreen wiper speed according to current executing arithmetic output valve and last windscreen wiper grade point.
5. the smooth control method of rainfall light sensor for automobile as claimed in claim 1, it is characterized in that: windscreen wiper grade comprises the pattern of splashing, in specific time, when Continuous accumulation differential signal dynamic change value RainDiff_Av sum exceedes a fixed value, export the pattern of splashing.
6. the smooth control method of rainfall light sensor for automobile as claimed in claim 1, it is characterized in that: by the dynamic change situation to ambient light, judge whether current windscreen wiper will carry out wiper action: in the time that ambient light variation exceedes a fixed value, forbid the windscreen wiper action in this time period; Otherwise, carry out normal windscreen wiper action.
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