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Old 11-24-2013, 05:32 AM   #21 (permalink)
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First run of the 5hp24 with arduino control :

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Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 2000 Amps, that's bad.
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Old 11-24-2013, 09:47 AM   #22 (permalink)
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Wow, you don't wast any time
2 observations:

1. Again sorry if this is obvious, but since this is trial and error, can you use the various speed sensors to ensure the clutch packs engage fully? i.e. clutch pack input rpm/output rpm = a known gear ratio.

2. Is line pressure rpm dependent, and does that affect pwm duty cycle?

3. when you disabled the valves in reverse, the output shaft doesn't look like it changed direction. Is that "normal"?

This is interesting also because a lot of people would like to make their ICE automatics behave more like a manual if they could do so short of a transmission swap.
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Old 11-24-2013, 12:04 PM   #23 (permalink)
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@P-hack

1. Yes that is the plan. Once I have the LM2907 circuits built and interfaced to the arduino I will have rpm readouts from the turbine and output shaft. Then its simply a matter of checking the ratio to ensure the intended gear is engaged.

2.Line pressure is maintained constant mechanically by the pump volume control valve between 500 and 6500rpm. PWM control of the EDS1 valve allows it to be varied electronically. As the arduino uno has only 8 bit pwm this gives me 255 levels. Good enough I reckon.

3.yes. All that should happen in reverse is that the line pressure defaults to max when power is lost and the pump loads up slightly more.


So this afternoon I wrote some code and added two shift buttons to the controller for up/down shift. Fired up in neutral and selected drive. Went into first no probs. Shifted to second and the box locked up into third , fourth and fifth no probs so looks like i have some more programming to do!!
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Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 2000 Amps, that's bad.
www.evbmw.com
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Old 12-02-2013, 03:48 AM   #24 (permalink)
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Latest update :


Now upshifting and downshifting.
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Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 2000 Amps, that's bad.
www.evbmw.com
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Old 01-05-2014, 04:03 AM   #25 (permalink)
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Running from a higher voltage pack with controller :


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Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 2000 Amps, that's bad.
www.evbmw.com
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The Following User Says Thank You to jackbauer For This Useful Post:
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