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Thread: Speeduino 2T EFI Project

  1. #241
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    20th January 2010 - 14:41
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    How quickly does the exhaust gas temp change with different running conditions Rob.
    I guess judging by water injection falure, its to slow to be useful as a calibration?
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  2. #242
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    Quote Originally Posted by husaberg View Post
    How quickly does the exhaust gas temp change with different running conditions?
    I have not done much work with EGT for myself but what I have seen with other bikes on the dyno the EGT seems as responsive as my O2 sensor. In other words, pretty good.

  3. #243
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    Someone was asking about RPM and TPS spacing.

    The steps between RPM and TPS points does not have to be even. The trick is to position them so that the fuel "Load" steps between cells is smooth as possible, no big jumps.

    Typically the RPM steps follow the Torque curve and some of the RPM steps are bunched together in the rpm area where the torque curve is steepest as the motor is getting on the pipe. The idea is to keep the increasing fuel steps as even as possible as the RPM changes.

    Click image for larger version. 

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    The graph is a typical carburetor flow curve. I tested my ball valve inlet and got the green line. 50% of air flow is typically at 25% throttle open. So at least half the fuel steps need to be below the 25% throttle line to get the increasing fuel demand steps due to the steadily increasing air flow in as even as steps as possible.

    The point is RPM and TPS steps can be uneven, its the steps between Fuel load cells that need to be as even as possible.

  4. #244
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    Quote Originally Posted by DaveyB
    TZ, when looking at your VE table, it looks like you've only allocated 6 columns from 3000 to 7200 rpm for the crankcase pressure differential measurement, whilst giving 10 columns to Alpha N from 7800 to 13500 rpm? I thought that the area (in rpm) below where the pipe starts working would require finer control and thus more columns. On a separate note are you running the engine with premix or oil pump?
    Premix. 20:1.

    No, the area below (and above) the transition area where the pipe starts to work does not need as many columns as the transition area itself.

    I have abandoned the VE map approach and for now are concentrating on Alpha-N multiplied by the MAP/Baro ratio.

    Alpha-N is great for everywhere the airflow is consistent. So Alpha-N is good for everywhere that is not on the pipe and every where on the pipe and above 50% TP throttle position. There is only a smaller area where Alpha-N does not work well and that is in the area where you could be on the pipe and less than 50% TP. That is because air flow here is variable due to inconsistent pipe action.

    Currently my crankcase PseudoMAP outputs a MAP value equal to the Baro value in the areas where airflow is going to be consistent. So the Alpha-N map here is multiplied by the ratio of 1:1 i.e., Alpha-N * 1.

    And in the area where the engine should be on the pipe but the TPS is less than 50% the PseudoMAP outputs three times the Delta crankcase pressure. So in the variable air flow area the Alpha-N map is multiplied by the ratio of PseudoMAP to Baro pressure. i.e., Alpha-N * (PseudoMAP/Baro).

    Anyway this is the current approach I am exploring, hopefully find out soon how well this concept works.

    Click image for larger version. 

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  5. #245
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    We can only imagine a bunch of Austrians are feverishly looking into it now Rob.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  6. #246
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    4th September 2017 - 10:39
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    Quote Originally Posted by husaberg View Post
    We can only imagine a bunch of Austrians are feverishly looking into it now Rob.


    You what group of Austrians you mean.
    If they are these, I see no future

    https://www.visordown.com/news/indus...ic-motorcycles

  7. #247
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    Quote Originally Posted by ceci View Post
    You what group of Austrians you mean.
    If they are these, I see no future

    https://www.visordown.com/news/indus...ic-motorcycles
    What the attendance like at the Electric formula 1 compared to the ICE F1.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  8. #248
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    25th November 2018 - 10:32
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    Hi guys,

    I was very quiet since my last post but I was still developing my EFI.
    As my engine was struggling to rev over 10,000RPM, I came to the conclusion I needed staged injection. But no...
    Using the oscilloscope in my hall sensor signal with the carb, I discovered that kind of sensor was guilty.
    So I changed the way to pickup the rev information. I used an optical switch and now everything works perfectly !



    I use a CBR125 throttle body but the original injector went over 80% duty cycle despite its 140cc/min flow rate. I use now a 200cc/min injector which a bit high but works good.

    I usually complain that most of 2S EFI projects in the internet are static tests at low RPM. Here is a small glance of the bike delivering all the power on the track. Yes it is race proven !


  9. #249
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    Some time ago I suggested that KTM was the brand that would have most investigated the EFI two stroke engine.
    Here we have one more test

    https://diglib.tugraz.at/download.ph...ocation=browse
    https://diglib.tugraz.at/download.ph...ocation=browse
    https://diglib.tugraz.at/download.ph...ocation=browse

  10. #250
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    Quote Originally Posted by ceci View Post
    Some time ago I suggested that KTM was the brand that would have most investigated the EFI two stroke engine.
    Here we have one more test

    https://diglib.tugraz.at/download.ph...ocation=browse
    https://diglib.tugraz.at/download.ph...ocation=browse
    https://diglib.tugraz.at/download.ph...ocation=browse


    I was wrong not yet from KTM

  11. #251
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    It has been shown that getting an injection system for the two-stroke engine that exceeds ecological standards is super difficult.
    Since it has a high level of difficulty, it is shown by the large number of manufacturers that have tried and failed
    One more https://gair.media.gunma-u.ac.jp/dsp...83.nishida.pdf

  12. #252
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    After months of wandering lost in the wilderness I think I have finally found the reason for my starting issue. It is simple really.

    I use a heavy duty drill running in reverse driving a big nut on the crankshaft to start the bike. This had worked well for ages. Then the old drills gearbox broke and I had to get another. Same reverse direction and speed. Also upgraded the firmware and had nothing but trouble since.

    After finaly getting around to buying a scope and putting it on the multi tooth wheel's inductive trigger pickup and studying the trace and thinking about it for a bit I realized what was happening.

    The crank looked to spin around impressively but the trace showed that as the piston started coming up against some real compression near TDC . The crank slowed down and there was not enough flux through the inductive trigger pickup to generate a signal big enough and with enough definition for the Speedy hardware to recognize. My 24-1 wheel looked like something with two gaps, one regular and another larger one where the flux was weak.

    The answer is to get a powerfuller drill. Simple really........... it has only taken ages to figure that out....

    Click image for larger version. 

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    The yellow trace is taken at Pin 19 on the Speeduino's Mega processor board and the purple trace is the inductive trigger pickup.
    .

  13. #253
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    Good! I have been coming here and to the Speeduino blog almost daily to look for progress!!!

  14. #254
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    Quote Originally Posted by Vannik View Post
    Good! I have been coming here and to the Speeduino blog almost daily to look for progress!!!
    Hi Neels

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    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  15. #255
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    Hi Husa,

    Thank you, but I am aware of the facility. It is one of my daily pleasures to come to KiwiBiker first thing in the morning and see what was posted while I was sleeping. My "gripe" was not with comming here but with finding nothing

    And I will keep on doing it.

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