Inside the G1 MDM & more power!

[retepsnikrep]

If you use the spreadsheet then follow the values on the diagram in that post. That worked for me, yes the fixed value resistors need to be 1%.

The newer 1k hack also works fine for me but the pictures you posted of your's were nowhere near good enough for us to see what is going on with your setup. You may be doing something simple, and obviously wrong.

[retepsnikrep]

I've been talking to Hitachi technical support about the H8/538 cpu chips used in the Honda modules in the G1 Insight BCM/MCM and IIRC the Civic HCH1 MCM.

They weren't able to offer any direct help and stated that in circuit programming for those chips was never fully sorted out so that probably puts the final nail in the coffin of hoping to re-program the BCM/MCM units at some stage a long way in the future. It clearly would not be feasible to remove the chips from the board.

This device is in fact a very old device and although there are several people in the company who were involved with its development several years ago, none of them have actually used the device for a long time. This puts us in a somewhat difficult situation to try and support you. We can only recommend off chip parallel programming solutions from companies such as Data IO and HiliSystems who may still have programming adapters available. Alternatively, I understand that the device hardware manual contains full wiring diagrams so you can prototype an adapter that makes the device look like a standard 2716 EEPROM. Sorry this is the best we can offer for such an old device.

The only glimmer of hope is the EEprom emulation mode, or perhaps Honda found the solution themselves More research reqd.

Anyway that's all a long way off. I have some searches set up on e-bay incase a programmer comes up.

[steveo]

Hey guys

This is long overdue, and i know peter had requested some photos earlier

Here are some high quality photos of how i modded my bcm & mcm. Just installed all the pots this evening.. Will still need to test

Will try the lowest current hoop up setting 17% and see if it works


http://s1078.beta.photobucket.com/us...current%20hack



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[retepsnikrep]

I hope it works out OK.

[steveo]

Hey peter

I finally was able today to install the modified mcm and bcm after modifying the battery case to fit the larger ima fuse rated at 125amp

Ive configured the mcm and bcm at both 12% current increase and i also tried 17% current increase and i get p1581 and p1585 error codes...

Any ideas?

Thanks


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[retepsnikrep]

MCM Wired up wrong by the look of it from the pics you posted earlier.

You should have + feed going to one end of resistors and - feed to the other end.

Signal from the 4 MCM sensors goes through the pot (adjusted to correct value), then to the center point of the fixed resistors, then from the centre point to the MCM.

The version you are trying is the old version of the current hack.


There is a much simpler +30% version (minus pots) using 8 x 1k resistors to +5v & gnd on the four MCM sensors and a 220R on the BCM current sensor. Try that it's more powerful as well!

[steveo]

Hey peter

Finally some success !!

I got the older version of the mod working

I did 17% current increase and it worked well after fixing the wiring as you said, quite happy!

I did experience some issues

P1439

P1586

I also had absoloutly no autostart unless i forced it with mima... I never thought my auto start would of been affected by the mod

I also noticed under much harder regen... After the mod.. When slowing down ... Id have very strong regen and then loss of regen and then regen would happen again .. Lol... Kinda weird... Car would give a "milkshake effect"

Thanks
-Steveo

ImageUploadedByAG Free1367811018.849607.jpg


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[retepsnikrep]

Try the new simpler version it's more reliable and less error prone.

1439 is the IGBT short circuit fault IIRC.

Looks like you are getting your +5v feed from the commutation sensor supply.

I would not use that, use the MCM current sensor +5v feed. I fed a wire from the other side of the pcb.

Autostart/Regen works fine with mine. But while you have those IMA errors I'm not surprised it is not working in yours.

[retepsnikrep]

Test

I tried the following today.

+40% current mod in the G1 using 680R resistors on the 4 MCM current sensors and a 150R resistor in parallel to the BCM current sensor. Giving an effective 60R resistance for the BCM sense resistor compared to 100R for stock.

Disable IGBT Short circuit flag by cutting connector inside MCM and tying MCM FSC input to +5v

Result

No IMA errors. (Good for testing)

No IMA start when ign turned on. Motor pulsing and buzzing clearly going into IGBT short circuit shutdown when trying to IMA start (square wave drive?). (I expected this after the HCH1 testing.)

Motor would start using IMAC&C gradual assist current feed & probably sine wave drive.

Assist very aggressive and more powerful as expected.
No detectable over current shutdown when IMA motor actually running and full current applied.
IGBT squealing like a stuck pig!

Regen ditto but more unreliable and cutting back. Possibly due to overcurrent.

Conclusion

Upto +30% Current is reliable for day to day use in my car for start/assist/regen etc and I have put those modules back in for now. Using 1k and 220R resistors. I have been using this for a couple of years now. (Also works in the HCH1 with some caveats)

+40% Current and above good fun but needs further work and a special High Current change over mode relay pcb. So sensors run at standard or +30% current normally but switch to +40% or higher current when full assist/WOT demanded. Switch back to +30% or standard when throttle released or not WOT.

I think I'll knock up a pcb with 5 little 5v SPCO signal change over relays for further experimenting.

I'll also add a bright led driven by the FSC line to monitor overcurrent events in real time when testing.

[steveo]

Hey Peter

Ive further revised my modded bcm/mcm to the newer 30% power mod

Is the bcm interceptor 5v power source safe to use for the mcm resistors?

Also can i put a 500ohm pot tuned to 220ohms in parrallel with the bcm oem 200ohms resistors or does it have to be fixed 220ohm resistor

Glad to see you looking for more power again, lets see how far we can go before the motor smokes out lol

Thanks





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