CN1048789C - Motor cycle ignitor regulating and testing instrument - Google Patents
Motor cycle ignitor regulating and testing instrument Download PDFInfo
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- CN1048789C CN1048789C CN97125229A CN97125229A CN1048789C CN 1048789 C CN1048789 C CN 1048789C CN 97125229 A CN97125229 A CN 97125229A CN 97125229 A CN97125229 A CN 97125229A CN 1048789 C CN1048789 C CN 1048789C
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Abstract
The present invention relates to a debugging instrument for an igniter of a motorcycle. Existing techniques debug in mechanical mode, adjusting processes are cockamamie and have low precision, and human factors account for a large proportion. The present invention designs that the debugging instrument for an igniter of a motorcycle is controlled by a microcomputer, a timing counter 8253 and two D triggers generate magneto rotation speed signals, and the adjustment of a resistance box is replaced by a resistor array switched by an analog switch, wherein the resistor array is composed of an 8255 parallel port, the analog switch and a set of precision resistors. The debugging instrument manufactured by a method of the present invention has the advantages of high precision and good stability.
Description
The present invention is the debugging instrument of the micro-processor controlled motor cycle ignitor of a kind of usefulness.
Along with improving constantly of motorcycle class, four stroke engine will account for the main share in market, and the general CDI ignition mechanism that has to advance automatically angle control of all using of 4 stroke motorcycle.So-called to advance angle control automatically be that the ignition advance angle of mean engine changes with rotating speed is different, and the relation of its typical optimal ignition angle and speed as shown in Figure 8.So in the CDI production process, need it is adjusted, make the relational symbol designing requirement of advance angle and the speed of CDI, the error of the advance angle of fitness for purpose under certain engine speed is less than ± 2 °.Therefore the production of CDI debugging is the crucial step during CDI produces.At present both at home and abroad mostly based on the debugging machinery type.Adjust rotating speed of motor by the commissioning staff in the debugging, observe tachometer and reach the speed that to test, observe when striking sparks on the fire disk, adjust the resistance of resistance box, reach the firing angle of expection, adjust motor speed again to another speed, adjust another resistance box, repeat said process.Adjust rotating speed again to different value, observe the angle of sparking, as meet then debugging and finish.This shows, its debug process is not only loaded down with trivial details, the skilled labour also needs to debug one more than 1 minute, and because the shakiness of motor speed and beating of sparking, precision is also very poor, personal factor has accounted for significant proportion therein, and often different people's debug results differs greatly, and the debugging enironment noise is very big.
The objective of the invention is to make the debugging instrument and the design method thereof of the motor cycle ignitor of a kind of validity height, high conformity.
Structure of the present invention comprises PC and the program control equivalent resistance that produces firing pulse, the debugging instrument carries out timing controlled with timing, counter 8253, two d type flip flops are delivered in 8253 timing, counting output pulse, combine the magnetogenerator tach signal that produces arbitrary timing with software on running on computer.But signal is become the signal of current drives mode with the current source of switch through electrical level conversion circuit.The reset end of two d type flip flops is connected to respectively that 8255 PC0 port and PC0 are non-, and data input pin D connects QBAR (Q is non-) end, the output Q control analog switch 1 of trigger A, the output terminal Q control analog switch 2 of trigger B; Regulate resistance with PC, its structure is the A mouth and the B mouth of LPT 8255, and A mouth and B mouth are controlled program control equivalent resistance respectively.Program-controlled electric resistance array is mainly by the Intel8255 LPT, and MAX312 analog switch and one group of R-2R precision resistance are formed.Wherein analog switch requires on resistance as far as possible little, and the on resistance of MAX312 is about 10 Europe, and precision resistance must reach 0.5% precision, to reach certain adjustment precision.The adjustment of resistance mainly writes different value by computer to 8255 LPTs makes one group of analog switch be in conducting or off state reaches.
In conjunction with design method of the present invention, being further described below of structure of the present invention: the generation of PC firing pulse of the present invention such as Fig. 2, firing pulse waveform such as Fig. 3 of being produced, the t1 section is a positive pulse, the t3 section is a negative impulse.The waveform of this firing pulse is a signal relevant with rotating speed, its period T=t1+t2+t3+t4.Corresponding to different rotating speeds, the value of each of firing pulse section t1, t2, t3, t4 also has nothing in common with each other.
In this motorcycle debugging instrument, used timing, counter 8253 to carry out timing controlled.T1, t2, t3, t4 time corresponding constant (8253 clock is 1Mhz, and promptly the minimum time calibration is a microsecond) are deposited in them in the data file under the good different rotating speeds of calculated in advance.During the control program operation,, call in corresponding 8253 time constant, write 8253 by the PC data/address bus according to needed rotating speed.Here, we use 8253 working method 4, and before each time period counting finished, just the time constant with next time period write.Such as, just write the time constant of t2 time period in the t1 time period.Each is when finishing time period, the positive pulse that it is a microsecond that 8253 counting, timing output OUT send a width, and the clock input section CK of two d type flip flops is delivered in this pulse.The reset end of these two triggers is received the PC0 port and the PC0 non-(d type flip flop uses 74ls74, and reset end 0 level is effective) of LPT 8255 respectively; Data input pin D connects QBAR (Q is non-) end.During the time period, by port PC0 two triggers are carried out zero clearing at t4, before t4 finishes, PC0 is changed to high level then, trigger A allows counting like this, and trigger B forbids counting.When t4 finished, 8253 OUT end was sent a positive pulse, and the output terminal D of trigger A becomes high level, and the output of trigger B keeps low level; When the t1 time period finished, the positive pulse of OUT end made trigger A overturn once more, and output becomes low level.In the t2 time period, PC0 is changed to low level, the trigger A upset that is under an embargo, and trigger B can overturn.When t2 finished, the clock end CK of trigger B received the positive pulse that the OUT end is sent here, and the output terminal upset is high level, and when t3 finished, trigger B overturn once more, was output as low level.So go round and begin again, the output of two triggers is the signal that the cycle is T.Its waveform such as Fig. 4, shown in Figure 5.Remove to control analog switch 1 with the output of trigger A then; The output Q of trigger B removes to control analog switch 2.If the value of Q is a high level, the analog switch conducting; Otherwise then not conducting of analog switch.Thereby in the t1 time period, circuit has the electric current of 5mA to flow out, and has the electric current of 5mA to flow in the t3 section.Other the time two not conductings of switch, no current flows out or flows to, so obtained needed ignition wave form.Here we have adopted two current sources rather than two voltage sources, and its reason is the driving force for intensifier circuit.
The Core Feature of motorcycle ignition circuit debugging instrument is: the resistance of determining two resistance among the firing circuit CDI.Because the difference of the distributed parameter of circuit, in each CDI, the resistance of these two resistance all is different.In order to make firing angle more accurate, must accurately determine the resistance of these two resistance.Traditional method is to regulate resistance value by the method for manual tune resistance box, thereby determines to meet the resistance value of ignition angle requirement.Obviously such method speed is slow, and precision also is difficult to improve.A skilled workman debugs a CDI circuit also needs 1-2 minute.And in our motorcycle ignition circuit debugging instrument, used PC to carry out resistance adjustment automatically, and debug a CDI circuit and at most only need 5-6 second, improved manufacturing efficiency greatly, also reached higher degree of regulation simultaneously.The signal of whole resistance adjustment circuit is shown in Figure 6.
When regulating resistance, put number by the data/address bus of PC to the A of LPT 8255 mouth and B mouth earlier, then the size of removing to control equivalent resistance respectively by 8255 A mouth and B mouth.Each program control equivalent resistance is corresponding to the resistance that will regulate.The structure of equivalent resistance is seen Fig. 7.It has comprised n analog switch SW1 to SWn and n+1 resistance R 0 to Rn.2 pin of resistance R 0 are received 1 pin of R1, and 2 pin of R1 are received 1 pin of R2 ... R
n2 pin receive R
N+11 pin.Each analog switch sw
nTwo ends receive resistance R respectively
nTwo ends.N is desirable greater than 1 integer, and according to the requirement of regulation range and precision, the present invention uses n=6-10 more.Each analog switch sw
nControl end link a certain position PA (B) of 8255A mouth or B mouth
N-1When control end is high level, switch on, then the resistance of this switch correspondence is by short circuit; When control end is low level, switch opens.By controlling opening or closure of analog switch, just can control the size of the equivalent resistance at A, B two ends like this, thereby reach the purpose of regulating resistance.
If the distribution of resistance scope that will debug is that Rx is to Ry.We can get R0 is its lower limit Rx.If get n=7,, have for resistance R 1 to R7
Write from 0000000 to 1111111 different number by A mouth or B mouth, just can control the closed of a series of analog switches or open, make equivalent resistance at R to 8255
xTo R
yBetween change.Find out easily that from top analysis its degree of regulation of this motorcycle debugging instrument can reach
, promptly
Certainly if get bigger n, bigger regulation range and the degree of regulation of Geng Gao can be arranged so.
The control program C language compilation of motorcycle ignition circuit debugging instrument, its block diagram is seen Fig. 9.The working procedure of program is as follows: at first carry out initialization 1.: write control word by the PC data/address bus to LPT 8255, A mouth and B mouth with 8255 are set at output, and low 4 of C mouth are set at input, Gao Siwei output.0 mouthful, 1 mouthful with counter 8253 is set at working method 4 (counting mode), and 2 mouthfuls are set at the frequency division mode.2. read from a data file that standard ignition is worth constantly under the different rotating speeds.This reference value records before debugging, and it and optimum igniting advance conversion relation one to one between the angle.For the CDI firing circuit of a factory, this reference value is consistent.The purpose of debugging instrument is exactly to find two suitable resistance R7 and R9, makes the time of ignition of CDI firing circuit identical with reference value, and the angle of lighting a fire this moment so also reaches best.For the CDI firing circuit of different manufacturers, the software and hardware of this debugging instrument all needn't be revised, and the reference value that only need change in the data file gets final product.3. prompting connects CDI firing circuit and debugging instrument, begins then to debug.4. in resistance R a and Rb, debug resistance R a earlier.Send 63 into 8255 A mouth and B mouth respectively.The program control peripheral circuit produces the fire signal of the frequency 100hz (6000 rev/mins) of waveform such as Fig. 3 then.
The igniting sharp pulse that the CDI firing circuit produces always occurs to the t3 time period at t1.When the t1 time period has just begun, send into time constant to 8253 1 mouthful, but this moment, 1 mouthful counting allowed end to be low level, counter 1 is not counted.When sharp pulse comes then, to count for 1 mouthful of 8253 to allow the end upset to be high level, counter 1 begins to count.When the t4 time period arrived, it is low that 1 mouthful counting allows end to become once more, and counting stops.So the live time of counter 1 is for the arrival of t4 occurring from sharp pulse.After t4 arrived, we can calculate the moment (moment that sharp pulse occurs) of igniting according to the count value of counter 1.And it and reference value is compared, if bigger than reference value, resistance R a should be littler so.Then the 8255A mouth should be sent into bigger number.Otherwise, then send into less number, identical up to time of ignition with reference value.In the process of this best resistance of search, this program has been used dichotomy.Such as we have used 0 to 6 of the 8255A mouth, and its all possible state has 2
7=128 kinds.Use behind the dichotomy and just can find out this value maximum 8 times.If use the method for sequential search, then under worst case, to search for 128 times, obviously speed will be slowly many.6. on screen, demonstrate the value of resistance R a, Rb.7. whether inquiry debugs next CDI firing circuit circuit, is then to jump to step 3; Otherwise finish debugging.
The debugging instrument that the present invention makes, obtain following good result:
(1) produces the motor simulation tach signal with microcomputer.Owing to produce by computer, need not motor, noiseless, and stable good reproducibility.Be easy to change to adapt to different magnetogenerator signals.
(2) adjustment of resistance box substitutes with the electric resistance array that analog switch switches, and the resistance adjustment is rapid, and the precision height by computer control, is convenient to other partly integrated one with system.
(3) measurement of ignition advance angle is finished with computer, gets rid of personal factor thus, reaches objectivity, conformity and the accuracy of test result.
Fig. 1 is the general diagram that the present invention debugs instrument, and wherein 1 is the PC bus, the 2nd, and LPT 8255,3rd, analog switch and resistance, the 4th, the CDI firing circuit, 5 is 8253 counters, the 6th, logical circuit, the 7th, current source.
Fig. 2 is that PC control ignition driving pulse produces block diagram, and wherein 8 is PC data/address bus, the 9th, and LPT 8255,10th, trigger A, the 11st ,+5mA current source, the 12nd ,-5mA current source, the 13rd, trigger B, 14 is 8253.
Fig. 3 is the igniting driving pulse waveform that produces.
Fig. 4 is the output of trigger A.
Fig. 5 is the output of trigger B.
Fig. 6 is the resistance adjustment circuit diagram.
Fig. 7 is the equivalent resistance structural drawing.
Fig. 8 is typical optimal ignition angle and velocity relationship figure.
Fig. 9 is a control program block diagram of the present invention.
Embodiment:
The running of whole motorcycle ignition circuit debugging instrument is as follows.For the motorcycle ignition circuit of certain factory, its igniting excitation signal waveforms such as Fig. 3.When 1650 rev/mins of rotating speeds, its t1, t2, t3, t4 value are respectively: 1100 microseconds, 1840 microseconds, 1160 microseconds, 32264 microseconds.At counting clock is under the situation of 1Mhz, and corresponding 8253 time constants are: 0x044C, 0x0730,0x0488,0x7E08.The moment that the igniting sharp pulse produces apart from the time that t3 finishes is 1196 microseconds.This reference time value can be placed among the data file test.dat.
When rotating speed 6000 changeed, t1, t2, t3, t4 value were respectively: 520 microseconds, 420 microseconds, 565 microseconds, 8495 microseconds.Corresponding time constant is: 0x0208,0x01A4,0x235,0x212F.The moment that the igniting sharp pulse produces apart from the time that t3 finishes is 945 microseconds.Equally this value is placed among the test.dat.
At the random distribution situation of this factory's resistance value, we are that each resistance in two groups of equivalent resistances has been got time train value: first group (Ra): R0=30k ohm, R1=1k ohm, R2=2
*R1=2k ohm.。。
R7=2
*R6=64k ohm; Second group (Rb): R0=250k ohm, R1=1k ohm, R2=2
*R1=2k ohm.。。
R7=2
*R6=64k ohm.
In fact, number of resistance is not limited in 8 in each group equivalent resistance, can be according to the change that requires of precision, regulation range, such as can be 5,6 or 10 or the like.
During debugging, we debug resistance R a down at high rotating speed (6000 rev/mins) earlier.A with 8255, B mouth all send into 63.Igniting excitation pulse when controlling some peripheral circuits and produce 6000 rev/mins by PC then.The block diagram of peripheral circuit is shown in figure two.
In this motorcycle debugging instrument, used timing, counter 8253 to carry out timing controlled.Here, we use 8253 working method 4, and before each time period counting finished, just the time constant with next time period write.At first write 8253 control word, send into pairing time constant 0x0208 of t1 time period then.8253 beginning length are the timing stage of t1.Write pairing time constant 0x01A4 of t2 stage in the t1 stage.After the t1 time period finishes, just begin the timing of t2 time period so.So, in each time period, write the time constant of next time period.Then 8253 carry out t1, t2, t3, the timing of t4 time period in turn.When each time period finishes, the positive pulse that it is a microsecond that 8253 counting, timing output OUT send a width, the clock input section CK of two d type flip flops is delivered in this pulse.The reset end of these two triggers is received the PC0 port and the PC0 non-(d type flip flop uses 74ls74, and reset end 0 level is effective) of LPT 8255 respectively; Data input pin D connects QBAR (Q is non-) end.During the time period, by port PC0 two triggers are carried out zero clearing at t4, before t4 finishes, PC0 is changed to high level then, trigger A allows counting like this, and trigger B forbids counting.When t4 finished, 8253 OUT end was sent a positive pulse, and the output terminal D of trigger A becomes high level, and the output of trigger B keeps low level; When the t1 time period finished, the positive pulse of OUT end made trigger A overturn once more, and output becomes low level.In the t2 time period, PC0 is changed to low level, the trigger A upset that is under an embargo, and trigger B can overturn.When t2 finished, the clock end CK of trigger B received the positive pulse that the OUT end is sent here, and the output terminal upset is high level, and when t3 finished, trigger B overturn once more, was output as low level.So go round and begin again, the output of two triggers is the signal that the cycle is T=t1+t2+t3+t4.Its waveform such as Fig. 4, Fig. 5.
Output Q with trigger A removes to control analog switch 1 then, and the output Q of trigger B removes to control analog switch 2.If the value of Q is a high level, the analog switch conducting; Otherwise then not conducting of analog switch.Thereby in the t1 time period, circuit has the electric current of 5mA to flow out, and has the electric current of 5mA to flow in the t3 section.Other the time two not conductings of switch, no current flows out or flows to, so obtained needed ignition wave form.Here we have adopted two current sources rather than two voltage sources, and its reason is the driving force for intensifier circuit.
The igniting excitation waveform that we will obtain is given CDI firing circuit, and it will produce the sharp pulse of lighting a fire to the t3 stage in time period t 1 so.When sharp pulse comes then, to count for 1 mouthful of 8253 to allow the end upset to be high level, counter 1 begins to count.When the t4 time period arrived, it is low that 1 mouthful counting allows end to become once more, and counting stops.So the live time of counter 1 is for the arrival of t4 occurring from sharp pulse.After t4 arrived, we can calculate the moment (moment that sharp pulse occurs) of igniting according to the count value of counter 1.And it and reference value is compared, if bigger than reference value, resistance R a should be littler so.Then the 8255A mouth should be sent into bigger number.Otherwise, then send into less number, identical up to time of ignition with reference value.In the process of this best resistance of search, this program has been used dichotomy.Because we have only used 0 to 6 of the 8255A mouth, its all possible state has the 27=128 kind.Use behind the dichotomy and just can find out this value maximum 8 times.If use the method for sequential search, then under worst case, to search for 128 times, obviously speed will be slowly many.
Suppose that for this CDI firing circuit, satisfactory Ra value should be 80k ohm.Certainly in advance we and do not know this value, we will constantly change the numerical value of 8255A mouth so, make that the equivalent resistance at A, B two ends is 80k Europe.Here, we to get R0 be 30k ohm.R1 is respectively 1K, 2K, 4K to R7 ... 64K.It is 0 to 127 that 8255 A mouth is put several scopes, the equivalent resistance at corresponding A, B two ends for 30K ohm to 157K ohm.General, when the setting value of 8255A mouth was x, the equivalent resistance of A, B was R0+ (127-x)
*R1.During debugging, send 63 into 8255 A mouth earlier, this moment, switch SW 1 was to the SW6 conducting, SW7 opens, and the equivalent resistance at A, B two ends is 94K ohm, and the time of ignition that records this moment will be bigger than reference value so, 8255 A mouth should be sent into bigger number, makes that the equivalent resistance at A, B two ends is littler.Be the number that should send into of A mouth between 63 and 127, we get it and are (127+63)/2=95.This moment, equivalent resistance was (30+127-95)=62k ohm.The time of ignition that records so will be littler than reference value, and the 8255A mouth should be sent into the number less than 95, make the equivalent resistance at A, B two ends bigger.Taking off the number of once sending into is (95+63)/2=79; This moment, equivalent resistance was 78k ohm.So, utilize dichotomy,, when the A mouth sends into 77, find that time of ignition is identical with reference value, so just found this suitable resistance R a=30+ (127-77) by 6 trials
*1=80k ohm.
After the value of resistance R a is determined, keep the numerical value of 8255A mouth constant, produce igniting excitation pulse then corresponding to 1650 rev/mins.Same procedure with debugging Ra constantly changes the numerical value of 8255B mouth, thereby obtains the resistance of Rb.
So far, whole debugging work just is through with.
Claims (3)
1. motor cycle ignitor regulating and testing instrument structure, comprise the PC and the program control equivalent resistance that produce firing pulse, it is characterized in that timing controlled is used regularly, counter 8253, two d type flip flops are delivered in 8253 timing, counting output pulse, it is non-that the reset end of two d type flip flops is connected to 8255 PC0 port and PC0 respectively, data input pin D connects QBAR (Q is non-) end, the output Q control analog switch 1 of trigger A, the output terminal Q control analog switch 2 of trigger B; Regulate resistance with PC, its structure is the A mouth and the B mouth of LPT 8255, and A mouth and B mouth are controlled program control equivalent resistance respectively.
2. the design method of a motor cycle ignitor regulating and testing instrument, it is characterized in that generation with the pulse of PC control ignition, the waveform of firing pulse is relevant with rotating speed, its cycle is T=t1+t2+t3+t4, the time constant of each section of cycle of different rotating speeds correspondence is deposited in the data file, with regularly, counter 8253 timing controlled, before each time constant counting finishes, the time constant of next time period is write; Each time period finishes, and 8253 send into a pulse, and two d type flip flops are delivered in this pulse, and the trigger output cycle is the signal of T, and the control program of firing circuit debugging instrument is:
(1) initialization procedure is write control word by the PC data/address bus to 8255 LPTs, and A mouth and B mouth with 8255 are set at output, and low four of C mouth are set at input, and Gao Siwei is set at output;
(2) read from a data file that standard ignition is worth constantly under the different rotating speeds;
(4) in resistance R a and Rb, debug resistance R a earlier;
(5) debugging resistance R b;
(6) value of demonstration resistance R a, Rb on screen;
(7) whether inquiry debugs next CDI firing circuit, is then to jump to step 3; Otherwise finish debugging.
3. the structure of motor cycle ignitor regulating and testing instrument according to claim 1, the structure that it is characterized in that equivalent resistance are to constitute with one group of analog switch SW and precision resistance R, and 2 pin of resistance R n are received R
N+11 pin, the two ends of resistance R n are received at the two ends of each analog switch SWn respectively, the control end SWn of each analog switch links a certain position PA (B) of 8255A mouth or B mouth
N-1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97125229A CN1048789C (en) | 1997-12-31 | 1997-12-31 | Motor cycle ignitor regulating and testing instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97125229A CN1048789C (en) | 1997-12-31 | 1997-12-31 | Motor cycle ignitor regulating and testing instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1190702A CN1190702A (en) | 1998-08-19 |
| CN1048789C true CN1048789C (en) | 2000-01-26 |
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ID=5177205
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97125229A Expired - Fee Related CN1048789C (en) | 1997-12-31 | 1997-12-31 | Motor cycle ignitor regulating and testing instrument |
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| Country | Link |
|---|---|
| CN (1) | CN1048789C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85205514U (en) * | 1985-12-18 | 1986-10-08 | 第二汽车制造厂 | Light-up angular advance detect and control device for multi-cylinder internal combustion engine |
| CN2252245Y (en) * | 1996-04-02 | 1997-04-16 | 谢自泉 | Motorcycle electrical equipment performance testing instrument |
-
1997
- 1997-12-31 CN CN97125229A patent/CN1048789C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85205514U (en) * | 1985-12-18 | 1986-10-08 | 第二汽车制造厂 | Light-up angular advance detect and control device for multi-cylinder internal combustion engine |
| CN2252245Y (en) * | 1996-04-02 | 1997-04-16 | 谢自泉 | Motorcycle electrical equipment performance testing instrument |
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| Publication number | Publication date |
|---|---|
| CN1190702A (en) | 1998-08-19 |
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