[joecvt]

Just finished installing MIMA_L in my CVT earlier today and it is cool...

I used a foot pedal (like used in the arcades) for the acceleration. I not
too concerned about regen as the CVT keeps the battery charged fairly
well. I added some parts to the MIMA_L design to turn on the power to
normal MIMA_L when the foot pedal is pressed in a bit then tuned for the
accel portion of MIMA. (Still need to do some minor adjustments).

I installed the pedal where the clutch pedal would normally be on the
manual version.

I ordered the parts and assembled as I was waiting for a meter that
can do "duty cycle" was shipping from Ebay. I will post some pictures
later on in the week.

Thanks Mike and Yves for the idea and design.

JoeCVT - Just your average CVT owner using MIMA

 

[Mike Dabrowski 2000]

Hi joecvt
Congratulations!
I had hoped that more people would have taken the inititive to roll their own MIMA.:lol:
I and several CVT insighters will be anxious to hear how the CVT responds .
For dutycycle determination, PWM signals can be easily and accurately converted to voltage, and a close look at the MIMA_L pdf on my site, you will see that the junction of C3 and R9 goes to the second half of U3. The PWM at that point has been converted to a voltage. 50% duty = 2.5V. 10 % = .5V and 90% = 4.5V Any high impedance DVM can read the dutycycle there.
Also Brian has found that the timing cap C2 needs to be temperature stable, or your dutycycle will change to less assist as the car warms up.

For the people waiting for MIMA_C, I am getting to the home stretch. The main MIMA_C board, the joystick board, and the dual led display board are all layed out, and I will be ordering some test boards this coming week.
Joe
The MIMA_C layout made it necessary to change the harness interconnect pinout one final time, so if you want to someday upgrade to MIMA_C, you may want to wire your harness interconnect the same as the final MIMA_C.
I will be updating all the schematics and documentation while I wait for the circuitboards, early next week. :wink:

 

[Mike Dabrowski 2000]

Joecvt stopped by the house on his way back to NH. I was happy to take my first ride in a CVT, and to see how MIMA worked within the system.
Another CVT owner that bought a service manual was nice enough to copy much of the manual relating to the ECM,MCM, TCM,BCM, so I could see how the signals differed from the 5 speed. The ECM is a different unit in the cvt from the manual version. The major difference is a serial communication link between the ECM and the TCM. Joecvt who has been driving the car with MIMA, has figured out how to take best advantage of the MIMA assist, while dealing with the changing ratios of the transmission. My first impressions from my limited test drive is that MIMA on a CVT is quite usable, but is not as predictable as on the standard transmission, mainly in reguard to the changing ratios. The regen is left to the CVT control system, which Joecvt says is able to keep the battery up. From the test drive, it looks like the charging is more aggressive on the cvt than on the standard.
Joecvt is interested in installing a MIMA_C sometime in the future, and will set up his foot controller and the joystick controller so that either can operate the system. It will be interesting to see how well that can be made to work.
:lol:

 

[joecvt]

MIMA_L has been installed for about 2 weeks now and I manage to
get between 5 - 7 more MPG on my way into work (about 21 miles).

This is a CVT getting 66 - 68 MPG (sometimes 70)...Manual models
are more than likely to get a higher percentage in increased MPGs.

I had a chance to go see Mike with the MIMA_C installed in his Insight
and was really impressed with how responsive the MIMA_C is with the
joystick Mike is using. It was very easy to control the charge and assist
levels (Mike had the joystick installed on the shift knob). I look forward
to the day I replace MIMA_L with MIMA_C with more user functions.

JoeCVT - Just your average CVT owner

 

[Resist]

Increased mileage in a CVT? Now you have my interest! I can't wait for the pics.

 

[joecvt]

Finally, the MIMA pictures are posted...Sorry it took a few weeks...
The whole MIMA page is here. or the complete address:

http://216.41.119.132/images/misc/insight/mima/mima.html

Here are a few images if you don't need to see the whole page.
The board with components installed.
Mounted under the shift (center) console.
The assist pedal mounted near the clutch location.

On Friday is was able to get 71.2MPG on the way into work (21 miles)

JoeCVT - Just your average CVT owner

 

[joecvt]

Today I was able to get 72.6 MPG on my way to work (21 miles - I had
74. something @ 18 miles into the trip) A good series of green lights and
MIMA_L (and some other mods) has really helped me control my mileage
to another level...My average into work is still 67MPG (I lose a bit on the
way home because of traffic) but my summer time lifetime since MIMA
installation is just over 64MPG...(This is in a CVT...)

Still planning on installing MIMA_C later on (hopefully with the foot pedal
connected to a relay to toggle inputs with the joystick.)

Mike,
I added a 12v -> 9v voltage adapter (from Radio Shack) for my power
input so now my voltage levels are stable going to the pedal. I will use
this adapter as my input as well for MIMA_C to work with my pedal to
supply 2.5v at rest and 4.8v when fully pressed with a relay toggling
the pedal / joystick input. (relay activated when pedal reaches 2.5v)

Note to others,
This adapter is not needed for normal MIMA_C installation...It is just
needed for my pedal mod to work with MIMA_L and C for stable power
output from the pedal to the controller.

Pics are still available in the links above...

JoeCVT - Just your average CVT owner

 

[Mike Dabrowski 2000]

Hi Joecvt
Nice work.
Once you get MIMA_C in your car, the regular throttle with AutoMIMA, may be all you need.
It would be cool to have the joystick and the pedal, so you could use either, I think we can come up with a special circuit to allow more than one input to MIMA. Need to wait till things calm down here.
:wink:

[moderator edit to prevent un necessary thread "bump" up the list]

For those interested in the MIMA project or those still wondering what it is the threads have become too fragmented for the developer to maintain and he has requested that his other MIMA threads be locked.

Please understand that any further suggestions for design changes will not be honored since the process is too far along. However, since its *opertation* can be easily modded in software such limited opinions will be welcome.

A few of the old threads that will most likely answer all your questions are here:

Hybrid controls and the MIMA project
http://www.insightcentral.net/forum/vie ... php?t=2471

Mima Statue Update
http://www.insightcentral.net/forum/vie ... php?t=3176

MIMA L works in a CVT (automatic circuitry with foot pedal)
http://www.insightcentral.net/forum/vie ... php?t=3233
(Moderators note: the newest version of MIMA is CVT compatible)

MIMA Display and Joystick Housings
http://www.insightcentral.net/forum/vie ... php?t=3353

The developers site is here:

http://pages.cthome.net/genesisone/index.htm

Its a complex topic and modification. And one that should be carefully reviewed if your deciding on purchase. The purchase thread is here:

http://www.insightcentral.net/forum/vie ... 9&start=15


The subject is still open for discussion at the developers selected for consolidation thread here:

http://www.insightcentral.net/forum/vie ... php?t=3357

Locking other threads. Future MIMA threads will be locked and follow-up's directed to the thread above.

[end]