Idle hunt

[mhanch]

Love this work you do. Thanks!

[Bitsyncmaster]

Wait till you see the non-swinging dwell setting.

[Bitsyncmaster]

I've been working on the PCB a lot. Got almost done just have to check the new components I had to layout.

I tested with a half second delay and still no hunting. Not sure if I will try shorter since I read the narrow band sensor take 300 ms to respond.

[Bitsyncmaster]

I ordered 3 circuit boards. Advanced Circuits has a special to order 3 or more boards with a 3 day turn for $33 each board. But shipping is $42 for ground UPS.

Anyway I have a lot to do on the firmware. I need to add the WOT to set that fixed dwell when on. Also need to add checking when the O2 input goes dead (disconnected) and set the fixed 45 deg. dwell. I have to do some testing of the warmup which is working great for a normal engine but I have to make sure it works when the mixture setting is way off normal.

I added an LED which is on the top side of the board on a spacer so you could drill a hole in the case and see it working.

I have one user jumper but have not decided if that will be used yet.

I should have looked into the redesign of the lambda ECU a long time ago. But I never had much hunting and it never bothered me. I think this will cure 90% or more hunting issues but a nice thing is when your adjusting your dwell it will not be swinging like the stock ECUs do.

[Timeless]

Is this similar to the idle hunt in question? This is my DMC stage 2.
https://drive.google.com/file/d/1h4p...ew?usp=sharing

[Bitsyncmaster]

Is this similar to the idle hunt in question? This is my DMC stage 2.
https://drive.google.com/file/d/1h4p...ew?usp=sharing

You must have set it privet. Can not access.

[Bitsyncmaster]

Thought of using my LED to light green when the dwell is between 35 deg and 45 deg (book value for normal setting). So running near an edge it will be flashing. To bad you can not see it from the rear of the car. That would let users adjust mixture without a dwell meter.

By the way my dwell setting is very accurate since it's based of the micro clock. The clock is +/- 1% spec but typical is 0.1%.

[Timeless]

You must have set it privet. Can not access.

I have it set to public access. - weird.

[Bitsyncmaster]

Thought of using my LED to light green when the dwell is between 35 deg and 45 deg (book value for normal setting). So running near an edge it will be flashing. To bad you can not see it from the rear of the car. That would let users adjust mixture without a dwell meter.

By the way my dwell setting is very accurate since it's based of the micro clock. The clock is +/- 1% spec but typical is 0.1%.

Well after thinking about this my dwell frequency is only affected by clock. The duty cycle is always exact since it works with counters. I'm only using 8 bits of resolution so I can set it with 0.3 % steps. The PWM does have 10 bits but I don't need that kind of resolution.

I also think on production boards I will use a red/green LED. The green will indicate running closed loop between 35 and 45 dwell and red would indicate dwell is max at 10 deg or 85 deg. I can set my PWM to any limits but for now I will just copy the stock limits.

[Bitsyncmaster]

I have it set to public access. - weird.

I saw it with your PM. You really have excessive swing in closed loop. I would change the O2 sensor and see if that fixes it.