Idle advance settings for Alpha-N

[Sellig78]

Hi!

I'd like to use the idle advance strategy on my car but i'm using Alpha-N. I can't put a minimun threshold of engine load as on my dataloggs the values are under 0.
Is there any possibility to disable the load threshold or put negatives values?

Thinks.

[Matt Cramer]

It sounds like you need to set a lower closed ADC count for your TPS calibration.

[Sellig78]

Matt,

I don't understand the link with my close ADC, i used the calibration tool in TS for my throttle and give me a value of 125. I'm looking for the engine load formula to understand but don't have sucess to found it, could you explain me?

Thinks.

[Matt Cramer]

Engine load is % throttle opening in alpha-N. If it is going negative, you need to fix your TPS calibration.

[mariob]

If it just goes to -0.2% or so, you can leave the calibration as it is. Even if you get values of -2% or similar, you can use a threshold value of 0% and live with the small blip when leaving the throttle.

If you need to recalibrate your TPS, you will need to correct the lower part of the VE table.

Best Regards, Mario

[Sellig78]

Ok so i just put 0 in the load threshold and the idle advance strategy doesn't care if the engine load goes under.

Thinks guys!

[Peter Florance]

Ok so i just put 0 in the load threshold and the idle advance strategy doesn't care if the engine load goes under.

Thinks guys!

I'm not sure this really works; this alpha-n MS2Extra3.2.1release on microsquirt module

Idle advance is set to 15 degrees

[Peter Florance]

Playing with it some more, maybe it would be better if the load comparison was removed for Alpha-N setups.

[Peter Florance]

if (flash8.idle_special_ops & IDLE_SPECIAL_OPS_IDLEADVANCE) {
if ((outpc.tps < flash8.idleadvance_tps) &&
(outpc.rpm < flash8.idleadvance_rpm) &&
(outpc.fuelload > flash8.idleadvance_load) &&
(outpc.clt > flash8.idleadvance_clt)) {
if((idle_advance_timer >= flash8.idleadvance_delay) &&
(flagbyte4 & flagbyte4_idleadvreset)) {
/* deg x 10 */
lsum = intrp_1ditable(outpc.fuelload, 4, (int *)pg8_ptr->idleadvance_loads, 1,
(int *)pg8_ptr->idleadvance_curve);
} else {
if (!(flagbyte4 &flagbyte4_idleadvreset)) {
DISABLE_INTERRUPTS;
idle_advance_timer = 0;
ENABLE_INTERRUPTS;
flagbyte4 |= flagbyte4_idleadvreset;
}
}
} else {
flagbyte4 &= ~flagbyte4_idleadvreset;
}
}

In Alpha-N this seems problematic because for me fuelload is TPS.

[Sellig78]

I agree with you Peter i still don't have success with the idle advance strategy with alpha-N, even with the load threshold at 0.

[Peter Florance]

I agree with you Peter i still don't have success with the idle advance strategy with alpha-N, even with the load threshold at 0.

I got it to work on the stim for a very narrow range of throttle inputs but only if I improperly calibrated the TPS to allow negative values.

I'm going to see what happens if I change the ini file to allow negative value for Idle Advance Minimum Fuel Load. I have no hope of my modifying the code as I don't know how to eliminate one of the comparisons in the case of Alpha N

Thanks for fixing the spelling in the subject to make it easier to find via search, too!

[Peter Florance]

Ok modifying the ini file to allow negative values for min fuel load works.

Not pretty but it works.

[gslender]

In the later code releases I added an option for idle advance to enable when it goes into CL-Idle....and this options ignores all the other conditions and uses the same condition the idle code uses (which isn't load based etc).

Also, you get the adaptive advance based on rpm target which I believe is much superior.

Try that hey?

G

[Peter Florance]

In the later code releases I added an option for idle advance to enable when it goes into CL-Idle....and this options ignores all the other conditions and uses the same condition the idle code uses (which isn't load based etc).

Also, you get the adaptive advance based on rpm target which I believe is much superior.

Try that hey?

G

Sounds like a plan.
Does it matter that the car has no idle valve?

[gslender]

In the later code releases I added an option for idle advance to enable when it goes into CL-Idle....and this options ignores all the other conditions and uses the same condition the idle code uses (which isn't load based etc).

Also, you get the adaptive advance based on rpm target which I believe is much superior.

Try that hey?

G

Sounds like a plan.
Does it matter that the car has no idle valve?

Well kinda as it relies on the CL-idle code running, so you do have to configure it so etc. not sure what that means really as its point is to control the idle valve and if none exist it will be just trying to control nothing.

G

[Peter Florance]

In the later code releases I added an option for idle advance to enable when it goes into CL-Idle....and this options ignores all the other conditions and uses the same condition the idle code uses (which isn't load based etc).

Also, you get the adaptive advance based on rpm target which I believe is much superior.

Try that hey?

G

Sounds like a plan.
Does it matter that the car has no idle valve?

Well kinda as it relies on the CL-idle code running, so you do have to configure it so etc. not sure what that means really as its point is to control the idle valve and if none exist it will be just trying to control nothing.

G

I'll leave a bucket to collect all the unused PWM....


Thanks

[gslender]

I'll leave a bucket to collect all the unused PWM....


Thanks

Actually, you only need an drain tube directly to the road. The ms2 makes pwm freely and doesn't need to be topped up or replenished

[Sellig78]

Ok so i will try your code G.

Thanks.

[Peter Florance]

I'll leave a bucket to collect all the unused PWM....


Thanks

Actually, you only need an drain tube directly to the road. The ms2 makes pwm freely and doesn't need to be topped up or replenished

seems MS3 does too; that is the black stain under my car every morning.