CN102452352A - Detection and control circuit of LED (light-emitting diode) steering lamps and detection method thereof - Google Patents
Detection and control circuit of LED (light-emitting diode) steering lamps and detection method thereof Download PDFInfo
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Abstract
The invention relates to a detection and control circuit of LED (light-emitting diode) steering lamps and a detection method thereof. The detection and control circuit comprises a flasher and the LED steering lamps; the LED steering lamps comprise main lamps, instrument indication lamps and side lamps; the flasher comprises a power supply circuit, an MCU, an automobile lamp driving module, a voltage acquisition module and sampling resistors; the voltage acquisition module is used for independently acquiring the voltage signal of each sampling resistor and sending the voltage signal into the MCU; and the MCU is used for converting the voltage signals to current data and comparing the current data with the corresponding current judgment standard data so as to judge whether the corresponding main lamp has a fault. In the invention, the influence of outside temperature can be eliminated due to the single main light detection and the single comparison and judgment, and the LED steering lamps can be correctly detected to find whether the LED steering lamps have faults or not under the influence of voltage change and outside temperature without using a temperature sensor.
Description
Technical field
The present invention relates to a kind of LED steering indicating light field, especially a kind of detection control circuit and method of inspection of LED steering indicating light.
Background technology
At present, because LED has the unsurpassable advantages of conventional car light such as long, energy-conservation, antidetonation of life-span, increasing flasher is brought into use the LED steering indicating light.Steering indicating light be chaufeur give extraneous transmit lane change, turn to, overtake other vehicles, the important device of warning signal.Flash rate to steering indicating light in the national legislation also has corresponding requirement, under the situation that king light damages, alerting signal output must be arranged.
The common steering indicating light and the connection mode of Der Blink und Abblendschalter are as shown in Figure 1; Promptly in the feed circuit of one-sided steering indicating light the series connection precision resistance; Use flash of light IC or micro controller system to detect the electric current on the precision resistance; When wherein having steering indicating light to damage, bigger variation can take place in electric current, detects the fault of steering indicating light with this.But said method is to realize fault detection through the electric current that detects on the precision resistance, and the precondition of failure judgement is one-sided steering indicating light working current after single steering indicating light the damages electric current must significantly exceed the equal normal operation of one-sided steering indicating light the time.When design LED steering indicating light, added the method for constant-current driven module in the feed circuit of producer through LED in steering indicating light, make the working current of LED in the steering indicating light not receive the influence of power supply voltage, to improve the service life of LED.But the working current of LED still can receive the influence of external temperature in the steering indicating light.Such as, be under the situation of 9-16V at power supply voltage range, during external temperature-40 ℃, the working current of former and later two steering indicating lights is respectively: 470mA, 330mA, during 80 ℃ of external temperatures, the working current of former and later two steering indicating lights is respectively: 310mA, 220mA.Under these circumstances; Working current when the working current during external temperature-40 ℃ might be greater than or equal to 80 ℃ of external temperatures if do not consider the external temperature value of steering indicating light during detection failure, uses the connection mode of Fig. 1; Utilize said method, can't accurately judge fault.In order to solve the problem that receives extraneous thermal effect; In Chinese patent CN200810219827.6, adopted method to solve the problem that receives extraneous thermal effect, i.e. the external temperature through having demarcated steering indicating light and the parameter list of working current earlier at steering indicating light the inside dress temperature sensor; Leave in the steering indicating light control unit; Load onto temperature sensor in the steering indicating light the inside then, during the actual detected fault, detect the external temperature and the working current of steering indicating light earlier; Do with the good parameter list of demarcation again and relatively judge whether method in bad order, so just can eliminate the influence that receives external temperature.But this detection mode is complicated, and the numerical value of detection needs corresponding one by one relatively with parameter list, and needs a plurality of temperature sensors to be evenly distributed in the LED lamp, has increased production difficulty and manufacturing cost.
Summary of the invention
The present invention can not accurately detect the technical matters whether the LED steering indicating light breaks down for solving existing fault detection control circuit, and ad hoc meter is a kind of easy to detect, and can detect accurately whether the LED steering indicating light break down the detection control circuit.
The detection control circuit of a kind of LED steering indicating light provided by the invention comprises Der Blink und Abblendschalter and LED steering indicating light, and this LED steering indicating light includes left front king light, left back king light, right front king light, right back king light totally four king lights and two meter lamps and two side lamps; Said Der Blink und Abblendschalter comprises power circuit, MCU, car light driver module, voltage acquisition module and four sampling resistors, and said power circuit is connected with said MCU, car light driver module respectively, is used for to said MCU and the power supply of car light driver module; Said MCU also is connected with the mouth of said car light driver module, voltage acquisition module respectively, stores electric current criterion data among the said MCU; Said car light driver module also is connected with each king light and each meter lamp respectively; Each sampling resistor is connected on respectively between said car light driver module and the corresponding king light, and the two ends of each sampling resistor also connect the corresponding collection terminal of said voltage acquisition module respectively;
MCU carries out the separate voltages data acquisition to each sampling resistor respectively through said voltage acquisition module; And each voltage data of being gathered sent among the said MCU; Said MCU is converted into each voltage signal the current data of the corresponding sampling resistor of flowing through; Said MCU compares each current data and the corresponding electric current criterion data that storage is good in advance; And sending corresponding instruction to said car light driver module according to comparative result, said car light driver module is made the corresponding driving signal according to this instruction to corresponding meter lamp.
As further improvement; King light electric current criterion data and back king light electric current criterion data before the electric current criterion data that said MCU stores comprise; When preceding king light electric current criterion data are left front king light or right front king light normal operation; The flow through current data of corresponding sampling resistor is used as the fault judgement standard foundation of left front king light and right front king light, when back king light electric current criterion data are left back king light or right back king light normal operation; The flow through current data of corresponding sampling resistor is as the fault judgement standard foundation of left back king light and right back king light.King light electric current criterion data comprise first higher limit and first lower limit before said; Be respectively left front king light or right front king light under assigned voltage and external temperature variation range during normal operation, maxim that the electric current of the corresponding sampling resistor of flowing through is obtained and minimum value; Said back king light electric current criterion data comprise second higher limit and second lower limit; Be respectively left back king light or right back king light under assigned voltage and external temperature variation range during normal operation, maxim that the electric current of the corresponding sampling resistor of flowing through is obtained and minimum value.
As further improvement; Said car light driver module includes four king light driver modules and two meter lamp driver modules; Wherein each king light driver module connects said power circuit and MCU respectively; And each king light driver module also is in series with a sampling resistor and a king light, and each sampling resistor lays respectively between each king light driver module and the corresponding king light, and each meter lamp driver module connects said power circuit and MCU respectively; And each meter lamp driver module also is connected with a meter lamp, also can connect a side lamp.Said MCU sends king light frequency, sends the meter lamp frequency to each meter lamp driver module to each king light driver module, and this meter lamp frequency has two kinds, i.e. normal frequency and failure frequency.
As further improvement; Said voltage acquisition module comprises four voltage collection circuits; Two mouths of each voltage collection circuit are connected on corresponding two collection pins of said MCU; Two collection terminals of said each voltage collection circuit are connected to the two ends of corresponding sampling resistor, and each voltage collection circuit carries out the voltage data collection to corresponding sampling resistor two ends, and each voltage data that will gather is sent among the said MCU; After this MCU receives the voltage acquisition data of each voltage collection circuit; With each voltage acquisition data conversion is the current data of corresponding sampling resistor of flowing through, and each current data and the corresponding electric current criterion data that store are in advance compared, and judges whether et out of order of corresponding king light with this.
Change in current size when breaking down less than single king light because of the variation size of the electric current temperature influence of single king light; So through detection control circuit of the present invention; Promptly be designed to all be provided with voltage detection module on the connection line of each king light; To reduce the detection error property of electric current, in MCU, set the electric current criterion scope of king light separately simultaneously, so that being carried out independent current ratio, each king light judges; Detection control circuit of the present invention can not had under the situation of temperature sensor, still make the accuracy of detection become possibility.
The method of inspection of the detection control circuit of a kind of LED steering indicating light of the present invention, this method of inspection is:
A: when king light was worked, said voltage acquisition module began the pairing sampling resistor of each king light is carried out the voltage data collection, and the voltage data of being gathered is sent among the said MCU;
B: said MCU is separately converted to above-mentioned each voltage data the current data of the corresponding sampling resistor of flowing through;
C: said MCU with store among above-mentioned each current data after transforming and the said MCU with it accordingly electric current criterion data compare; If having current data exceeds corresponding electric current criterion data, then send the instruction of the flash rate that changes the corresponding instrument indicator lamp to said car light driver module;
D: said car light driver module drives the flash rate of corresponding meter lamp according to above-mentioned modification of order.
As further improvement; Said voltage acquisition module comprises four voltage collection circuits; Two mouths of each voltage collection circuit are connected on corresponding two collection pins of said MCU; Two collection terminals of said each voltage collection circuit are connected to the two ends of corresponding sampling resistor, are the voltage data collection of each voltage collection circuit to corresponding sampling resistor so said voltage acquisition module carries out the separate voltages data acquisition to each sampling resistor respectively.
King light electric current criterion data and back king light electric current criterion data before the electric current criterion data that said MCU stores comprise; When king light electric current criterion data are left front king light or right front king light normal operation before above-mentioned; The flow through current data of corresponding sampling resistor, and as the fault judgement standard foundation of left front king light and right front king light; When above-mentioned back king light electric current criterion data are left back king light or right back king light normal operation, the current data of the corresponding sampling resistor of flowing through, and as the fault judgement standard foundation of left back king light and right back king light.
King light electric current criterion data comprise first higher limit and first lower limit before said; Be respectively left front king light or right front king light under assigned voltage and external temperature variation range during normal operation, maxim that the electric current of the corresponding sampling resistor of flowing through is obtained and minimum value; Said back king light electric current criterion data comprise second higher limit and second lower limit; Be respectively left back king light or right back king light under assigned voltage and external temperature variation range during normal operation, maxim that the electric current of the corresponding sampling resistor of flowing through is obtained and minimum value.
Said MCU is converted into the voltage data of each voltage collection circuit collection the current data of the corresponding sampling resistor of flowing through; And compare with corresponding electric current criterion data; When said MCU detects left front king light or the corresponding electric current of right front king light more than or equal to first lower limit and when being less than or equal to first limit, then judge above-mentioned king light normal operation; When the detected left front king light of said MCU or right front king light during, judge that then above-mentioned king light breaks down less than first lower limit or greater than first higher limit; When said MCU detect with left back king light or the corresponding electric current of right back king light more than or equal to second lower limit and when being less than or equal to second limit; Then judge above-mentioned king light normal operation; When said MCU detects with left back king light or the corresponding electric current of right back king light less than second lower limit or greater than second higher limit, judge that then above-mentioned king light breaks down.
Said MCU comprises normal flash rate and fault flash rate to the meter lamp frequency that the car light driver module sends, and during said king light trouble free, the flash rate of meter lamp is normal flash rate accordingly; When said king light had fault, the flash rate of corresponding meter lamp was the fault flash rate.
Said car light driver module includes two meter lamp driver modules; Each meter lamp driver module is connected with said power circuit, MCU respectively; And respectively connecting a meter lamp, said meter lamp driver module is used for receiving the instruction of said MCU and drives the flash rate of corresponding meter lamp according to this instruction.
Change in current size when breaking down less than single king light according to the variation size of the electric current temperature influence of single king light; So through such fault detection method; Promptly each king light is carried out the detection error size that independent current detecting reduces electric current; In MCU, set simultaneously the electric current criterion scope of king light separately; Each king light is carried out independent current ratio judge, detection control circuit of the present invention can not had under the situation of temperature sensor, also can correctly judge whether et out of order of LED steering indicating light.
Description of drawings
Fig. 1 is the schematic circuit diagram of existing Der Blink und Abblendschalter and steering indicating light;
Fig. 2 is the schematic circuit diagram of a kind of embodiment of a kind of LED steering indicating light provided by the invention;
Fig. 3 is that a kind of circuit of embodiment of the detection control circuit of a kind of LED steering indicating light provided by the invention connects scheme drawing;
Fig. 4 is a kind of testing process figure of embodiment of method of inspection of the detection control circuit of a kind of LED steering indicating light provided by the invention.
The specific embodiment
Clearer for technical matters, technical scheme and beneficial effect that the present invention is solved, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 2; The detection control circuit of a kind of LED steering indicating light of the present invention; This detection control circuit comprises Der Blink und Abblendschalter 1 and LED steering indicating light, and this LED steering indicating light comprises left front king light L1, left back king light L2, right front king light L3, right back king light L4 totally four king light L1, L2, L3, L4 and two meter lamp L5, L6 and two side lamp L7, L8, and meter lamp L5 is used for indicating the mode of operation of left side king light L1, L2; Meter lamp L6 is used for indicating right side king light L3, the mode of operation of L4.
Said Der Blink und Abblendschalter 1 comprises power circuit 2, MCU 3, car light driver module 4, voltage acquisition module 5 and four sampling resistor RX1, RX2, RX3, RX4; Power circuit 2 is connected with MCU 3, car light driver module 4 respectively; Power circuit 2 carries out exterior power supply filtering, rectification, high pressure suppress, after step-down handles, gives said MCU 3,4 power supplies of car light driver module respectively; MCU 3 also respectively with car light driver module 4, voltage acquisition module 5 connects, said car light driver module 4 also is connected with each king light and each meter lamp respectively; Each sampling resistor is connected on respectively between said car light driver module 4 and the corresponding king light, and the two ends of each sampling resistor also connect corresponding two collection terminals of voltage acquisition module 5 respectively; Store the flash rate information of electric current criterion data and steering indicating light among the MCU 3; MCU 3 receives the turn sign instruction; Send corresponding signal instruction according to the instruction that receives to said car light driver module 4 then; MCU 3 receives the voltage data of each sampling resistor of voltage acquisition module 5 collections; And each voltage data of being gathered is converted into the current data of corresponding sampling resistor, and each current data after will transforming compares with corresponding electric current criterion data, send corresponding instruction according to judged result to car light driver module 4 then; Car light driver module 4 drives corresponding flash rate according to the signal instruction that said MCU 3 sends to corresponding meter lamp.
As a kind of specific embodiment of the present invention; As shown in Figure 3; Car light driver module 4 includes 41,42,43,44, two meter lamp driver modules 45,46 of four king light driver modules, and wherein each king light driver module connects said power circuit 2 and MCU 3 respectively; And each king light driver module is in series with a king light and a sampling resistor; Each sampling resistor lays respectively between each king light driver module and the corresponding king light, and each meter lamp driver module connects power circuit 2 and MCU 3 respectively, and each meter lamp driver module is connected with a meter lamp and a side lamp.MCU 3 send the meter lamp frequencies to meter lamp driver module 45,46, and this meter lamp frequency comprises normal frequency and failure frequency to king light driver module 41,42,43, transmission king light frequency.Car light driver module 4 amplifies king light frequency, the instrument indication indicator lamp Frequency Synchronization of MCU 3 outputs; And be applied on the steering indicating light; Realize lighting and extinguishing control of steering indicating light; Car light driver module 4 is also with the flash rate of king light L1, L2, L3, L4 and the king light Frequency Synchronization of MCU 3 outputs, also with the flash rate of meter lamp L5, L6 and the meter lamp Frequency Synchronization of MCU 3 outputs.
The electric current criterion data that MCU 3 stores comprise the preceding king light electric current criterion data and the back king light electric current criterion data that are used for the fault judgement standard foundation of left back king light L2 and right back king light L4 of the fault judgement standard foundation that is used for left front king light L1 and right front king light L3;
King light electric current criterion data comprise first higher limit and first lower limit before above-mentioned; Be respectively left front king light L1 or right front king light L3 under assigned voltage and external temperature variation range during normal operation, maxim and minimum value that the electric current of flow through corresponding sampling resistor RX1 or sampling resistor RX3 is obtained;
Above-mentioned back king light electric current criterion data comprise second higher limit and the 3rd lower limit; Be respectively left back king light L2 or right back king light L4 under assigned voltage and external temperature variation range during normal operation, maxim and minimum value that the electric current of flow through corresponding sampling resistor RX2 or sampling resistor RX4 is obtained.
Because each voltage collection circuit 51,52,53,54 structure is identical, and function is the same, each sampling resistor RX1, RX2, RX3, RX4 function too, so be that example is explained each voltage collection circuit just with voltage collection circuit 51 and cooresponding sampling resistor RX1.
Der Blink und Abblendschalter 1 has 10 pin; Two pin IN1, IN2 connect the turn sign command link respectively; Two pin IN3, IN4 connect vehicle power; Four pin IN5, IN6, IN7, IN8 connect four king light L1, L2, L3, L4 respectively, and two pin IN9, IN10 connect meter lamp L5, side lamp L7 and meter lamp L7, side lamp L8 respectively.
Said MCU 3 controls the steering indicating light work according to pin IN1 left direction signal, pin IN2 right steering signal through car light driver module 4 or quits work; Store the electric current criterion value that is used to detect above-mentioned king light L1, L2, L3, L4 among the MCU 3; MCU 3 gathers the voltage data at corresponding sampling resistor two ends respectively through each voltage collection circuit; And each voltage data of being gathered is converted into current data; And with corresponding electric current criterion value relatively, thereby judge whether king light L1, L2, L3, L4 have fault; The king light frequency of MCU 3 outputs is the flash rate of king light L1, L2, L3, L4; Also be the control signal of king light driver module 41,42,43,44, the meter lamp frequency of MCU 3 outputs is the flash rate of meter lamp L5, L6 and side lamp L7, L8, also is the control signal to meter lamp driver module 45,46; The MCU3 storage inside two flash rate values; Directly being programmed in the Control Software of MCU 3, is respectively f1 and f2, and value is all according to the requirement of national legislation; Flash rate when the flash rate when f1 is defined as the dereliction lamp failure, f2 are defined as the king light fault.When king light broke down, corresponding meter lamp sent the alarm alerting signal, promptly accelerates flash rate, i.e. said frequencies f2.
Effective when pin IN1 left direction signal, and two the king light L1 in left side, L2 are all just often, and the flash rate of two king light L1, L2, meter lamp L5 and the side lamp L7 in left side is f1; Effective when pin IN2 left direction signal, and when having an et out of order at least among two the king light L1 in left side, L2, two king light L1 in left side, the flash rate of L2 still are f1, and the flash rate of meter lamp L5 and side lamp L7 becomes f2; The principle of work of right hand steering lamp is identical with the left side; When pin IN1 left direction signal and pin IN2 right steering signal simultaneously effectively the time; Both sides king light L1, L2, L3, L4, meter lamp L5, L6 and side lamp L7, L8 work simultaneously; It goes without doing indicating fault, the flash rate of both sides king light L1, L2, L3, L4, meter lamp L5, L6 and side lamp L7, L8 still is f1.
The method of inspection of the detection control circuit of a kind of LED steering indicating light of the present invention comprises the following steps:
A: 5 pairs of pairing sampling resistors of each king light of said voltage acquisition module carry out the voltage data collection, and the voltage data of being gathered is sent among the said MCU 3;
B: said MCU 3 is separately converted to above-mentioned each voltage data the current data of the corresponding sampling resistor of flowing through;
C: said MCU 3 with store among above-mentioned each current data after transforming and the said MCU 3 with it accordingly electric current criterion data compare; If the current data that has after the conversion exceeds corresponding electric current criterion data, the instruction of then sending the flash rate that changes the corresponding instrument indicator lamp to said car light driver module 4;
D: said car light driver module 4 drives the flash rate of corresponding meter lamp according to above-mentioned modification of order.
The said voltage acquisition module 5 that detects in the control circuit comprises four voltage collection circuits 51,52,53,54; Wherein two of each voltage collection circuit mouths are connected on corresponding two collection pins of said MCU 3; Two collection terminals of said each voltage collection circuit are connected to the two ends of corresponding sampling resistor, the voltage data collection that each voltage collection circuit carries out the cooresponding sampling resistor of each king light two ends respectively;
King light electric current criterion data and back king light electric current criterion data before the electric current criterion data that said MCU 3 stores comprise; When king light electric current criterion data are left front king light L1 or right front king light L3 normal operation before above-mentioned; The flow through current data of sampling resistor RX1 or sampling resistor RX3, and as the fault judgement standard foundation of left front king light L1 and right front king light L3; When above-mentioned back king light electric current criterion data are left back king light L2 or right back king light L4 normal operation, the current data of flow through mutually corresponding sampling resistor RX2 or sampling resistor RX4, and as the fault judgement standard foundation of left back king light L2 and right back king light L4.
King light electric current criterion data comprise first higher limit and first lower limit before said; Be respectively left front king light L1 or right front king light L3 under assigned voltage and external temperature variation range during normal operation, maxim and minimum value that the electric current of flow through corresponding sampling resistor RX1 or sampling resistor RX3 is obtained;
Said back king light electric current criterion data comprise second higher limit and second lower limit; Be respectively left back king light L2 or right back king light L4 under assigned voltage and external temperature variation range during normal operation, maxim and minimum value that the electric current of flow through corresponding sampling resistor RX2 or sampling resistor RX4 is obtained.
The electric current of corresponding sampling resistor RX1 or sampling resistor RX3 that detects left front king light L1 or right front king light L3 as said MCU3 is then judged left front king light L1 or right front king light L3 normal operation more than or equal to first lower limit and when being less than or equal to first higher limit; When the electric current of the corresponding sampling resistor RX1 of said MCU 3 detected left front king light L1 or right front king light L3 or sampling resistor RX3 during, judge that then left front king light L1 or right front king light L3 break down less than first lower limit or greater than first higher limit;
The electric current of corresponding sampling resistor RX2 or sampling resistor RX4 that detects left back king light L2 or right back king light L4 as said MCU 3 is more than or equal to second lower limit and when being less than or equal to second limit; Then judge left back king light or right back king light normal operation; When said MCU 3 detects electric current with the corresponding sampling resistor RX2 of left back king light L2 or right back king light L4 or sampling resistor RX4 less than second lower limit or greater than second higher limit, judge that then left back king light L2 or right back king light L4 break down.
Said MCU 3 comprises normal flash rate and fault flash rate to the meter lamp frequency that car light driver module 4 sends, and during each king light trouble free, the flash rate of corresponding meter lamp is normal flash rate; The flash rate of corresponding meter lamp is the fault flash rate when having king light to break down.
Said car light driver module 4 includes two meter lamp driver modules 45,46; Each meter lamp driver module is connected with MCU 3 with said power circuit 2 respectively; And respectively connecting a meter lamp and a side lamp, said meter lamp driver module is used for receiving the instruction of said MCU 3 and drives the flash rate of corresponding meter lamp according to this instruction.
The electric current criterion data that said MCU 3 in above-mentioned method of inspection stores obtain in the following manner.
Because the symmetry of automobile both sides king light L1, L2, L3, L4 parameter, because the fault detection mode of right side king light L3, L4 and left side king light L1, L2 fault detection mode are identical, be that example describes again with king light L1, L2.
The electric current criterion data of left front king light L1, the pairing sampling resistor RX1 of left back king light L2, RX2 are demarcated through following mode:
1) with Der Blink und Abblendschalter 1 respectively with each king light L1, L2, L3, L4 links together; The requirement that Der Blink und Abblendschalter 1 connects exterior power supply is: the variable range of output voltage has comprised 9-16V, maximum exportable current value when voltage range is 9-16V, the maximum current when working simultaneously greater than all steering indicating lights.King light L1, L2 place an adjustable temperature range to comprise in-40 ℃-85 ℃ the temperature control box.
2) king light L1, L2 are mode of operation, with king light L1; The external temperature of L2 is progressively adjusted to 85 ℃ from-40 ℃, adjusts 5 ℃ at every turn, and each adjustment back kept 5 minutes; The working voltage table measures respectively that king light L1 lights and when extinguishing, voltage data V1, the V2 at sampling resistor RX1 two ends.Utilize Ohm's law to calculate, flowing through sampling resistor RX1 current data is I1=(V1-V2)/RX1.
3) in the power supply voltage range of 9-16V, voltage is adjusted to 16V from 9V, adjust 1V at every turn; Repeating step 2); Can obtain respectively under 9V, 10V, 11V, 12V, 13V, 14V, 15V, these 8 power supply voltages of 16V, temperature changes in-40 ℃ of-85 ℃ of scopes, and king light L1 flows through the current data scope of corresponding sampling resistor RX1 when lighting; And king light L1 flows through the current data scope of corresponding sampling resistor RX1 when extinguishing; In order to guarantee the reliability of data, can select to use 3 cover steering indicating light L1, L2 does test.
4) when king light L1 lights, get the minimum value of the electric current that flows through sampling resistor RX1, promptly first lower limit is defined as Imin1; Get the maxim of the electric current that flows through sampling resistor RX1, promptly first higher limit is defined as Imax1.
5) according to above 2) to 4) step, calibrate king light L2 light the back corresponding sampling resistor RX2 minimum current and maximum current, promptly second lower limit and second higher limit are defined as Imin2 and Imax2 respectively.Imin1, Imax1, Imin2, these four values of Imax2 are solidificated in the software of MCU 3, as electric current criterion data.
As shown in Figure 4, following three kinds of failure conditions possibly appear in king light L1, L2:
The first, break off from Der Blink und Abblendschalter 1 to the circuit the king light L1, the result who causes is that the current data of sampling resistor RX1 is less than electric current criterion data I min1; In like manner, break off from Der Blink und Abblendschalter 1 to the circuit the king light L2, the result who causes is that the current data of sampling resistor RX2 is less than electric current criterion data I min2; The second, to the line short the king light L1, the result who causes is that the current data of sampling resistor RX1 is greater than electric current criterion data I max1 from Der Blink und Abblendschalter 1; In like manner, to the line short the king light L2, the result who causes is that the current data of sampling resistor RX2 is greater than electric current criterion data I max2 from Der Blink und Abblendschalter 1;
The 3rd, the LED et out of order of king light L1, the result who causes is that the current data of corresponding sampling resistor RX1 is less than fault judgement normal data Imin1 or greater than fault judgement normal data Imax1; The LED et out of order of king light L2, the result who causes is that the current data of corresponding sampling resistor RX2 is less than fault judgement normal data Imin2 or greater than fault judgement normal data Imax2.
Like Fig. 3 and shown in Figure 4, its method of inspection is following:
Step 1: the voltage data V1 and the V2 at corresponding sampling resistor RX1 two ends gathered when 51 couples of king light L1 of voltage collection circuit lighted, and simultaneously voltage data V1, V2 were sent among the MCU 3;
Step 2: MCU 3 is through calculating the current data I1 that voltage data V1, V2 is converted into the pairing sampling resistor RX1 of king light L1.
Step 3: MCU 3 does comparison with current data I1 and Imin1, Imax1 in the step 2, and comparative result is designated as 1 more than or equal to Imin1 and when being less than or equal to Imax1, and under all the other situation, the result all is designated as 0;
Step 4: carrying out step 1 in step 3; MCU 3 also carries out fault detection to king light L2; Method is identical with step 1 to step 3; Just voltage collection circuit 51 is changed into sampling resistor RX1 and cooresponding voltage collection circuit 52 of king light L2 and sampling resistor RX2, and the current data of the corresponding sampling resistor RX2 of king light L2 changed into Imin2, Imax2 do comparison, comparative result is designated as 1 more than or equal to Imin2 and when being less than or equal to Imax2; Under all the other situation, the result all is designated as 0;
Step 5: MCU 3 does multiplying with above-mentioned two comparative results again;, the result is judged as king light L1 when being 0 and/or king light L2 has fault; MCU 3 sends the flash rate f2 of meter lamp 5 to meter lamp driver module 45; When the result is 1, be judged as king light L1, L2 trouble free, MCU3 does not do any variation.
Step 6: if MCU 3 sends flash rate f2 to meter lamp driver module 45,45 of meter lamp driver modules drive meter lamp 5 with flash rate f2 and glimmer, if MCU3 does not do any variation, 4 of car light driver modules are not done any variation.
In the LED steering indicating light working process, detect control circuit and carry out according to the above-mentioned steps circulation.
When pin IN1 left direction signal and pin IN2 right steering signal simultaneously effectively the time, two side steering indicating light installedly work simultaneously, according to the national legislation requirement, and it goes without doing indicating fault, two side steering indicating light installed flash raties are f1.
The control circuit of LED steering indicating light of the present invention and fault detection method; Change in current size when breaking down less than single king light because of the variation size of the electric current temperature influence of single king light, thus through each king light being detected separately and carrying out independent relatively judgement, need not to provide temperature sensor; Also can be correct detect king light and whether break down; And easy to detect, low cost of manufacture has very high practical value.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the detection control circuit of a LED steering indicating light; Comprise Der Blink und Abblendschalter and LED steering indicating light; This LED steering indicating light includes left front king light, left back king light, right front king light, right back king light totally four king lights, two meter lamps and two side lamps; Said Der Blink und Abblendschalter comprises power circuit, MCU, car light driver module, voltage acquisition module and four sampling resistors; Said power circuit is connected with said MCU, car light driver module respectively, it is characterized in that: said MCU also is connected with the mouth of said car light driver module, voltage acquisition module respectively, stores electric current criterion data among the said MCU; Said car light driver module also is connected with each king light and each meter lamp respectively; Each sampling resistor is connected on respectively between said car light driver module and the corresponding king light, and the two ends of each sampling resistor also connect the corresponding collection terminal of said voltage acquisition module respectively;
Said MCU carries out the separate voltages data acquisition to each sampling resistor respectively through said voltage acquisition module; And each voltage data of being gathered sent among the said MCU; Said MCU is converted into each voltage data the current data of the corresponding sampling resistor of flowing through; And the corresponding electric current criterion data that each current data and storage are in advance got well compare; And sending corresponding instruction to said car light driver module according to comparative result, said car light driver module is made the corresponding driving signal according to this instruction to corresponding meter lamp.
2. the detection control circuit of a kind of LED steering indicating light according to claim 1 is characterized in that: the electric current criterion data that said MCU stores comprise the preceding king light electric current criterion data and the back king light electric current criterion data that are used for the fault judgement standard foundation of left back king light and right back king light of the fault judgement standard foundation that is used for left front king light and right front king light.
3. the detection control circuit of a kind of LED steering indicating light according to claim 2; It is characterized in that: king light electric current criterion data comprise first higher limit and first lower limit before said; Said first higher limit and first lower limit are respectively left front king light or right front king light under assigned voltage and external temperature variation range during normal operation, maxim that the electric current of the corresponding sampling resistor of flowing through is obtained and minimum value;
Said back king light electric current criterion data comprise second higher limit and second lower limit; Said second higher limit and second lower limit are respectively left back king light or right back king light under assigned voltage and external temperature variation range during normal operation, maxim that the electric current of the corresponding sampling resistor of flowing through is obtained and minimum value.
4. the detection control circuit of a kind of LED steering indicating light according to claim 3; It is characterized in that: said car light driver module includes four king light driver modules and two meter lamp driver modules; Wherein each king light driver module connects said power circuit and MCU respectively; And each king light driver module also is in series with a sampling resistor and a king light; Each sampling resistor lays respectively between each king light driver module and the corresponding king light, and each meter lamp driver module connects said power circuit and MCU respectively, and each meter lamp driver module also is connected with a meter lamp.
5. the detection control circuit of a kind of LED steering indicating light according to claim 4 is characterized in that: each meter lamp driver module can also connect a side lamp.
6. the detection control circuit of a kind of LED steering indicating light according to claim 4; It is characterized in that: said voltage acquisition module comprises four voltage collection circuits; Two mouths of each voltage collection circuit are connected on corresponding two collection pins of said MCU; Two collection terminals of each voltage collection circuit are connected to the two ends of corresponding sampling resistor, and said voltage acquisition module carries out the separate voltages data acquisition to each sampling resistor respectively and is the voltage data collection of each voltage collection circuit to corresponding sampling resistor.
7. the method for inspection of the detection control circuit of a LED steering indicating light, this method of inspection may further comprise the steps:
A: said voltage acquisition module carries out the voltage data collection to the pairing sampling resistor of each king light, and the voltage data of being gathered is sent among the said MCU;
B: said MCU is separately converted to above-mentioned each voltage data the current data of the corresponding sampling resistor of flowing through;
C: said MCU with store among above-mentioned each current data after transforming and the said MCU with it accordingly electric current criterion data compare; If having current data exceeds corresponding electric current criterion data, then send the instruction of the flash rate that changes the corresponding instrument indicator lamp to said car light driver module;
D: said car light driver module drives the flash rate of corresponding meter lamp according to above-mentioned modification of order.
8. the method for inspection of the detection control circuit of a kind of LED steering indicating light according to claim 7; It is characterized in that: the said voltage acquisition module that detects in the control circuit comprises four voltage collection circuits; Wherein two of each voltage collection circuit mouths are connected on corresponding two collection pins of said MCU; Two collection terminals of said each voltage collection circuit are connected to the two ends of corresponding sampling resistor; The method of inspection A of the testing circuit of said LED steering indicating light, particularly: each voltage collection circuit carries out the voltage data collection to the cooresponding sampling resistor of each king light two ends respectively, and the voltage data of being gathered is sent among the said MCU.
9. the method for inspection of the detection control circuit of a kind of LED steering indicating light according to claim 8; It is characterized in that: king light electric current criterion data and back king light electric current criterion data before the electric current criterion data that said MCU stores comprise; When king light electric current criterion data are left front king light or right front king light normal operation before above-mentioned; The flow through current data of corresponding sampling resistor, and as the fault judgement standard foundation of left front king light and right front king light; When above-mentioned back king light electric current criterion data are left back king light or right back king light normal operation, the current data of the corresponding sampling resistor of flowing through, and as the fault judgement standard foundation of left back king light and right back king light.
10. the method for inspection of the detection control circuit of a kind of LED steering indicating light according to claim 9; It is characterized in that: king light electric current criterion data comprise first higher limit and first lower limit before said; Be respectively left front king light or right front king light under assigned voltage and external temperature variation range during normal operation, maxim that the electric current of the corresponding sampling resistor of flowing through is obtained and minimum value;
Said back king light electric current criterion data comprise second higher limit and second lower limit; Be respectively left back king light or right back king light under assigned voltage and external temperature variation range during normal operation, maxim that the electric current of the corresponding sampling resistor of flowing through is obtained and minimum value.
11. the method for inspection of the detection control circuit of a kind of LED steering indicating light according to claim 10 is characterized in that: in step C, further comprising the steps of:
The electric current of corresponding sampling resistor that detects left front king light or right front king light as said MCU is then judged above-mentioned king light normal operation more than or equal to first lower limit and when being less than or equal to first higher limit; When the electric current of the corresponding sampling resistor of detected left front king light of said MCU or right front king light during, judge that then above-mentioned king light breaks down less than first lower limit or greater than first higher limit;
The electric current of corresponding sampling resistor that detects left back king light or right back king light as said MCU is more than or equal to second lower limit and when being less than or equal to second limit; Then judge above-mentioned king light normal operation; When said MCU detects with left back king light or the corresponding electric current of right back king light less than second lower limit or greater than second higher limit, judge that then above-mentioned king light breaks down.
12. the method for inspection of the detection control circuit of a kind of LED steering indicating light according to claim 11; It is characterized in that: the meter lamp frequency that said MCU sends to the car light driver module; Comprise normal flash rate and fault flash rate; During said king light trouble free, the flash rate of corresponding meter lamp is normal flash rate; When said king light had fault, the flash rate of corresponding meter lamp was the fault flash rate.
13. the method for inspection of the detection control circuit of a kind of LED steering indicating light according to claim 12; It is characterized in that: said car light driver module includes two meter lamp driver modules; Each meter lamp driver module is connected with said power circuit, MCU respectively; And respectively connecting a meter lamp, said meter lamp driver module is used for receiving the instruction of said MCU and drives the flash rate of corresponding meter lamp according to this instruction.
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| CN2010105288905A CN102452352A (en) | 2010-10-28 | 2010-10-28 | Detection and control circuit of LED (light-emitting diode) steering lamps and detection method thereof |
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Application publication date: 20120516 |