Air Shift Sequential Box not always going into next gear at high RPM

[tricky1024]

Hoping for a little help, been tuning the gearbox now for some time and its actually now really ok to drive. with smooth up and OK downshift but when doing pull and holding the foot to the floor and completing a flat shift occasionally it will not find the next gear. i am running closed loop and can see from the log that the gear voltage thinks its in the gear but there is some odd voltage bouncing as its not actually in gear. you can then see i request the gear again off throttle and open loop does indeed find the gear. please can someone give me some advise to how to ensure i do always get the next gear as when racing it cannot do this.

You can see here i changed from third to fourth, cut happened and the box came out of gear, never made it to fourth and you can see the log thinks the car is in all sorts of gears until a re-request the change. then i have a sold gear.

Could it be i need to adjust the air solenoid to allow more forward movement, if i do this though i guess i run the risk of not having enough movement for the downshift.

Gear Miss.png (109.92 KiB) Viewed 22158 times

[stevieturbo]

There's no reason for it to do that.

Log gear position voltage at say 100Hz and see what it is reporting.

And have you the in gear voltages precisely set ?

[tricky1024]

Position sensor is set accurate and always checked against the log voltage and its spot on. I replaced the gear sensor and still the same. ill increase the logging and see if anything shows up, i might look at the mechanical setup of the actuator too.

Dont know it it matters but the gear voltages are not always descending see below:
Should i ideally set them so they always decrease? i.e highest voltage in reverse gear? i also understand they rotary gear sensors have a dead spot, would the logs show this dead spot?

Also as this is in Closed loop it could be the shift is ending early, can you please explain in English what the delta proportion does? currently setup to 80.005% for all gears.

gear voltages.png (31.8 KiB) Viewed 22043 times

[stevieturbo]

That is a bizarre setup. Install or wire the gear position sensor properly, because a table like that makes zero sense. So yes, it should rise or fall in a linear fashion throughout it's normal range.

Absolutely NOT like that

[tricky1024]

lol, on it

[tricky1024]

Stevie,

Sensor now set correctly and gear change is so much better, but now having an issue between 4th and 5th gear, it thinks its in 5th but isn't.

in gear voltage.png (53.28 KiB) Viewed 20679 times

You can see from this log there is a reduction in voltage toward target voltage but I'm guessing the targetV has been met thus ecu believes the gear has changed gear and ends shift as we are in closed loop.

gear change log.png (52.79 KiB) Viewed 20679 times

Can you advise what can cause this? if we feel it is the delta in which direction i should be adjusting the delta? its currently at 80% up to ward 90% or down?

[stevieturbo]

a screenshot tells little, however.

Do you have the voltages set dead correct ?

You show a screenshot where it appears to be in 5th gear, showing a voltage of 1.555v....yet you have the voltage set for 5th at 1.205v.

That makes zero sense.

[tricky1024]

Stevie,

I can see why that screen shot is confusing, the voltage im showing you is the voltage when it thinks its in 5th.
Yes the voltages are set exact and then i check the logs to ensure they are correct.

Im going to play with the Delta and reduce it, i think that mean the targetV will be closer to actual.

Regards,

Richard

[stevieturbo]

Whatever is happening, the gear pot is seeing movement as is clear from the irregular line.