Dear
Can i get some info on the TCI ignition here ?
Grts
Patrick
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Hi Patrick
Can you express what information you want?
We manufacture one ignition for distribuitor engines using magnetic pick-up and transformer type coil.
Regards
Luis A. Loeff
LFB Ind & Com Ltda
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Dear
Found your ignition on the web (Bosch Tci ) and was impressed by the good idea. I made a test this weekend and got it working :-) . Also changed the dwell time to 3ms and it worked. When I uncomment the extra sparks it works also but it seems to get a bit unstable on the dwell time at low rpm's . This could also be my old oscilloscope .
Only problem was the assembly of the .asm file. I keep getting 1 error on the line 137 from the INC file of the 16F84.
This is a line at the bottom just after the last LIST. The assembler say's " illegal character (< ) "
Only when I erase the whole text past LIST I have no errors.
You have any solution ?
Grts Patrick
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Hi Patrick
I am glad you tried the software for the electronic ignition.
Please send mi a copy of the text where this character "<" appears.
Remember that the .INC files are supplied by Microchip, not by me.
This bad character is probably a misprint or error.
I cannot guarantee I will know the answer because I composed that software 6 or 7 years ago.
Regards and good luck
I haven't answerered before because my computer broke
Regards
Luis A. Loeff
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Hello Luis
Thank you for the reaction.
Just seen your mail as i was on holiday. In the meanwhile I have build your project and it works fine. :-) I have erased the part after LIST and the assembler accepts the asm file now.
Did a bit of study on the asm because I am not a programmer , but beginning to understand it now. Still have some questions about it , but will send them in another mail along with some pictures.
I am going to use it on a ford sierra cosworth turbo engine. As the ECU itself has no dwell control , done by a marelli amplifier module, it was not possible to use a more powerfull and faster coil. With your design I can use the ignition timing output signal from the marelli ecu and transform it with a programmable fixed dwell time. The output from the PIC I use then to control a bosch BIP373 transistor that can easily switch 11amps (and is fully protected ).
I have done some testing on HEI coils also with your project. Will send you the info.
Grts from Belgium Patrick
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Luis
I had to erase everything after LIST at the bottom of the file. Otherwise I kept on getting error messages when assembling.
I use windows notepad to open the file .
Patrick
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Hi Patrick
Amazing all scripts that got glued together with the file P16F84.inc
It seems angelfire also modifies .inc files so I have renamed them as .inz and
the user should rename back to .inc
Regards
Luis
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ignition project
Hello Luis
Here some pictures from the project.
And some questions about the program (correct me if I am wrong )
1. Maxtim is the time to wait to check if the engine does not turn anymore. Where do you get the 65.5 msec from ?
2. Lowlim is the rpm point to change to non programmed dwell ( 1/8 from cycle time ) Why do you do that and not calculate to almost zero rpm ?
3. Why do you use a difficult calculation for permaxdw and not a fixed time/rpm .
dwell equ 20 ; = 5.12 ms
; maxdwell computed automatically
maxdwell equ dwell + 0x04 ; = 6.144 ms. , 0x04 = spark duration
; permaxdw computed automatically
permaxdw equ (dwell/2 + 2) + 4 ; arbitrary min. dwell + spark
; duration for extra sparks
; computed automatically
medlim equ 8*permaxdw ; 0x80 = 32.77 ms
; computed automatically
lowlim equ 8*dwell ; 0xA0 = 40.96 ms.
maxtim equ 0x06 ; = 6* 65.5 ms approx. 393 ms.
Mvg.
Patrick
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LX 91 coil testing
Hello Luis
I did some more testing today as you can see on the pictures with these settings.
1. Ubat = 13V
2. Freq = 133 Hz =4000 rpm
3. Dwell 3.5 msec
4. Plug gap 1mm
5. Amp prim 1A/div vert
6. Amp sec 1V/div vert at the top of the screen (measuring resistor at negative plug = 21.6 ohm)
7. Time 1msec/div
8. I calculate the energy at the primary side , simpler ( I know there are losses to secondary in the coil that are different )
The test with 2 coils parallel was not good. The current was very high primary but divided by the 2 coils so no problem .The spark energy was high also but the spark time was also very very short !!
Almost like CDI. It was more like a spike than a few msec burn time. So no option.
The crane coil has the most energy at 3.5 msec dwell with 7 amp primary current but also the shortest bun time +- 1.25 msec.
The second lx91 picture is at 14V Ubat , here I have 8.5 amps primary and 13.9 mA secondary !! So maybe I even have to decrease the dwell to 3.25 or 3 msec , as the car is at 13.8-14V while running.
Here I have 0.5*4.7*8.5^2 = 169 mJ !!
It sure is the “fastest” and most powerful coil .
I find the IGN-1 coil really bad , as supposed to what I find on the internet ! Only 4 amps prim.
The groupA coil has not so much primary current but very long burn time. Almost 2.5 msec. So it’s also kind a “slow” , strange as it’s sold as racing coil ???
But the good old Bosch coil is not bad at all !!
I think at 4 msec dwell it maybe has the same energy as the crane LX91 and 2 msec spark time. Of course when you add 2 msec spark time and 4 msec dwell I get 6 msec cycle and that’s only, for me, 5000 rpm.
At the end the question is ; will the 1.3 msec spark time of the LX91 be good enough. Then the LX91 would be the best option.
Grts
Patrick
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Hi Patrick
ignition project > > > > Hello Luis > > > Here some pictures from the project. > > And some questions about the program (correct me if I am wrong ) > 1.Maxtim is the time to wait to check if the engine does not turn anymore. Where do > you get the 65.5 msec from ?
That is for coil protection. After 393 ms. with the no inputs, coil shuts off and no current flows. 65.5 ms. is 256 count of time counter.
> 2.Lowlim is the rpm point to change to non programmed dwell ( 1/8 from cycle time ) > Why do you do that and not calculate to almost zero rpm ?
When the engine idles there is a variation of speed of several percent. But dwell varies very much. So to make sure that there will always be a spark, I start increasing dwell at 1/8 732 rpm for 4 cylinder engine and 5.12 ms. dwell. For 3 ms dwell transition will be at around 1220 rpm
> 3.Why do you use a difficult calculation for permaxdw and not a fixed time/rpm . > > This has to do with multiple sparks and and it is a transition point on when to start multiple sparks. I don't remember very well.
You can also adjust spark duration 0x04 times (256 microsec.) by changing maxdwell.
> dwell equ 20 ; = 5.12 ms > > ; maxdwell computed automatically > maxdwell equ dwell + 0x04 ; = 6.144 ms. , 0x04 = spark duration > > ; permaxdw computed automatically > permaxdw equ (dwell/2 + 2) + 4 ; arbitrary min. dwell + spark ; > duration for extra sparks ; computed automatically medlim equ > 8*permaxdw ; 0x80 = 32.77 ms ; computed automatically
I think at lower than around 915 rpm (32.77 ms.) begin multiple sparks
> lowlim equ 8*dwell ; 0xA0 = 40.96 ms. > maxtim equ 0x06 ; = 6* 65.5 ms approx.393 ms. > > > > Regards
Luis A. Loeff
LFB Ind & Com Ltda
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ignition project
Thanks Luis
I have changed the lowlim factor already so i get around 700rpm also with 3.5 msec dwell for my 4 cylinder engine.
lowlim equ 12 *dwell ; 0xA0 = 40.96 ms.
Grts Patrick
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Luis
Would it be possible to program a copy of the existing output (signal ) on a second PIC output but with a programmable time offset (+- 0.5 msec ) ? Apparently a modern technique is a dual coil/spark on one spark plug. A bit like multispark on CDI but then with TCI and 2 coils on 1 spark plug.
Grts Patrick
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ignition project
Hi Patrick
You mean another diffferent output pin with everything delayed like 0.512 ms. ?
Yes I think it could be done. There are many unused pins. But the ignition generates multisparks at low speeds when time allows. What would be your purpose?
Regards
Luis
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Hello Luis
Yes , that's what i mean. But for the whole rpm range While reading about modern ignitions I found an article from , I think LUCAS , about there latest technology for very lean burn low emissions engines. I assume al the major brands are going this way to achieve modern emissions levels. To get very high energy + very long sparks ( 2.5 msec ) needed for this kind of mixture, and with IGBT transistor technology, they fire two coils (in one housing ) on one plug .One after the other. A bit like multispark on a CDI ignition. As you will know these high power coils are very high on primary current (15-20A) and fast saturation ( dwell about 1.5-2msec) but there sparks are also way to short ( +- 1 msec) for this application. So a second output + BIP 373 + coil , with a ignition delay like 0.512-0.768 msec , would be a nice experiment.
Grts Patrick
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Hello Luis
Did the first few miles today with the ignition and a crane LX91 coil.
All ok.
Dwell set at 3.25 msec , the LX is a fast and powerful coil. Reaching 8 amps primary current in 3.25 msec !
The BIP can go up to 11 amp but then the coil is getting to hot.
No extra sparks as the ECU dos this already.
This is my schematic.
The output from the ECU is a open collector pull down transistor.
R8 is to give the 5V regulator always a load. Like it more like that.
Mvg.
Patrick
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Luis
Here the first draw of my wasted spark system.
The 0 ohm resistors are for the easy drawing of the board.
Grts
Patrick
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picture 6
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Hi Patrick
This is a nice schematic, and I have 2 questions about your ECU?
What car is it on? Will the ECU not be able to adjust dwell?
REGARDS
Luis
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Hi Luis
What car is it on? My sierra Cosworth from 1986 . Will the ECU not be able to adjust dwell ? No, it only controls timing , normally the marelli ignition amplifier does the dwell regulation. ( google : bigturbo.uk)
Grts Patrick
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Hi Luis
Here it seems you have sort of a distribuitor output and you want to make it a wasted spark. Correct. The wasted spark system you can buy , I find way to expensive. And I like to DIY :-)
Usually wasted spark have 2 outputs from ECU Indeed , I know.
In this case you have to command the ADG switch properly. How do you do it?
Optical reflection sensor ( diode/transistor ) detects the adapted rotor position and syncs the ADG switch. This way I have a mechanical controlled wasted spark system with programmable dwell . So this is usable on every old car with distributor and only 1 ECU output. Of course this is still a project , but I think I will file a patent on it.
http://passionford.com/forum/ford-sierra-sapphire-rs500-cosworth/475429-mech anical-electronic-wasted-spark-ignition-system.html
Grts Patrick
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