CAJ Innovations Forums - MkIII voltage boost

raz

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MkIII voltage boost
04/30/09 at 16:46:43

I've tried to determine from the latest (MkIII) assembly instructions the modifications from My16M MkII that is described as "voltage boost capability that is used to help MyECU remain adequately powered while starting" but I can't see the difference in PCB or components. Where/how is this done? How good is it? Is it possible to modify a Mk II incorporating this change, and would that be approved and maybe even endorsed or would you object and suggest I buy a Mk III kit?

A variation of the question could be this: would you sell the updated PCB on its own?

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« Last Edit: 04/30/09 at 16:47:13 by raz »

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_Cliff_ YaBB Moderator Offline I Love YaBB 2! Posts: 126	Re: MkIII voltage boost Reply #1 - 04/30/09 at 18:45:13 It consists of L2,Q5,R37 and D17 (incorrectly marked D15 in schematic) http://www.cajinnovations.com/MyECU/ECUpower.htm The uC output is pin 21 MkIII firmware is the same as MkII It boosts the 12V to about 18. Shouldn't be too hard to make up something on veroboard.
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raz Senior Member Offline Guzzi 11OO Sport, My16MkV, Innovate LC-1 Posts: 373 Stockholm, Sweden Gender:	Re: MkIII voltage boost Reply #2 - 05/02/09 at 04:47:00 Cool, I'll look into it next winter.
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_Cliff_ YaBB Moderator Offline I Love YaBB 2! Posts: 126	Re: MkIII voltage boost Reply #3 - 05/02/09 at 08:25:13 Check for pulses on pin 21 that stop when the engine is running. If not you'll need a firmware update.
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raz

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Re: MkIII voltage boost
Reply #4 - 05/14/09 at 07:16:44

R37 is listed as 10K but the assembly pictures and the listed quantities implies it is 47K. Which is it? I guess any of them will do fine, right?

Edit:
And for the inductor, would 220uH, 10%, 0.76 A, Rdc: 0.43 Ω be fine? I never understood inductors. If tolerance is to the right direction I'm set...

I could throw in R22, R24, D15, C13 as well. Are they some kind of protection?

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« Last Edit: 05/14/09 at 09:08:53 by raz »

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greenmonster Full Member Offline Sweden Posts: 196	Re: MkIII voltage boost Reply #5 - 05/14/09 at 12:10:45 Quote: "voltage boost capability that is used to help MyECU remain adequately powered while starting" Quote: It boosts the 12V to about 18. I`ve had Voltmeter on my battery, always below 11V w starting. How do I check I have this function & that it`s working? It shows in Ecucontrol143 when starting or what?
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_Cliff_

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Re: MkIII voltage boost
Reply #6 - 05/14/09 at 12:39:37

You can check the voltage on pin 1 of the voltage regulator. Pin 3 is 5V

The value of R37 isn't critical but I use 10K now.
The inductors I use look like resistors, probably know as RF chokes.
Those values you quote Raz sound fine. Not sure what those components are you mention. What are you looking at. On the My16M they are unrelated.

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raz

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Re: MkIII voltage boost
Reply #7 - 05/15/09 at 02:10:21

_Cliff_ wrote on 05/14/09 at 12:39:37:

Not sure what those components are you mention. What are you looking at. On the My16M they are unrelated.

I'm still at the same schematic you posted, http://www.cajinnovations.com/MyECU/pics/ECUPS2.gif

I have no idea what those are for but if they are good I can easily add them while I'm at it.

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_Cliff_ YaBB Moderator Offline I Love YaBB 2! Posts: 126	Re: MkIII voltage boost Reply #8 - 05/15/09 at 09:25:03 Raz, leave those componenents out. I would remove R10 from the main PCB and put components R10, L2, Q5, R3,7 D15( lower) and C16 on a new board. Slot the new circuit in where R10 was and add ground and gate signal to the new board. The input of D15 ( upper ) actually goes to the micro. Its the battery voltage sense input.
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raz Senior Member Offline Guzzi 11OO Sport, My16MkV, Innovate LC-1 Posts: 373 Stockholm, Sweden Gender:	Re: MkIII voltage boost Reply #9 - 05/15/09 at 17:08:16 _Cliff_ wrote on 05/15/09 at 09:25:03: Raz, leave those componenents out. ok, thanks
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greenmonster Full Member Offline Sweden Posts: 196	Re: MkIII voltage boost Reply #10 - 05/16/09 at 04:44:42 Quote: You can check the voltage on pin 1 of the voltage regulator. Pin 3 is 5V Where is Voltage regulator? I measure when starting or just w ignition on? I`m very much a newbie in electronics.
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_Cliff_ YaBB Moderator Offline I Love YaBB 2! Posts: 126	Re: MkIII voltage boost Reply #11 - 05/16/09 at 07:26:22 The reg. is VR1 at the right. It might be easier to measure at the link near C18 http://www.cajinnovations.com/MyECU/pics/MyP8MkIII_PCB.png
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greenmonster Full Member Offline Sweden Posts: 196	Re: MkIII voltage boost Reply #12 - 05/16/09 at 09:57:21 Ok, I`ll do that. Just to b sure. Quote: "voltage boost capability that is used to help MyECU remain adequately powered while starting" Do I have that function on my MyECU P8? Bought 1 year ago & checked by you. If it`s faulty, how would MyECU behave then, no start?
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Luhbo

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Re: MkIII voltage boost
Reply #13 - 05/16/09 at 17:44:53

I'm still using a MkII version of MyEcu, without voltage boost. Never had problems as long as I had a good battery and a good starter. Same with the MK1 which also was an absolutely reliable unit.
Once I had a starter in which the mags had come loose. Its current consumption was so high that in fact the MyEcus couldn't start the bike. But then that's been a faulty bike, not a faulty MyEcu. Maybe an internal voltage booster would have made things a bit better then, but who knows.

In another thread you're writing that you doubt if your voltage booster is working because you measured below 11V at the battery while you were starting the bike. That's normal. The ecu - powered by the battery - cannot boost the battery itself of course.
The booster just helps to prevent the 5V cpu voltage from dropping too much, in order to prevent a cpu reset.

If your bike doesn't start you probably have other problems. Battery too old, too light (small), not fully charged, compression screwed too high, starter gone bad, things like that.

HTH, Hubert

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« Last Edit: 05/16/09 at 22:02:06 by Luhbo »

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greenmonster Full Member Offline Sweden Posts: 196	Re: MkIII voltage boost Reply #14 - 05/16/09 at 19:31:41 Thx f that info, Hubert! Will soon do tests w bigger battery & 2 other P8`s to further investigate my starting issues.
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