GEAR SHIFT CUT

Hello, we are experiencing issues calibrating the ignition cut during gear shifting on our Motec M142 ECU. We have a load cell in the link between the gear lever and the gearbox (attached photo of M1 calibration). The problem is that the data does not consistently indicate when the ignition cutoff is activated, resulting in variable force readings. This makes it difficult to determine the correct timing for the gear shift.

We are recording the gear, gear shift, shift lever force, and ignition cut status channels at 20 Hz. Would it be possible to add the ignition and gear position sensor channels to the existing channels at the same 20 Hz frequency? What additional channels and sampling frequency would be recommended to analyze and diagnose the issue of inconsistent ignition cut activation during gear shifting?

We're probably doing something wrong.

Other questions:

What effect does the estimated gear shift have with a gear sensor installed? We have all the gear ratio data loaded.

What effect would setting different gear tolerance values ​​have on this problem? What would be the most logical values ​​to start with?

Attach data file: https://1drv.ms/f/c/450d38319a16998a/EsoYuosNrJNIrOjW1p4SAdoB_4raOhUCA2h1c56q9Fq-Qw?e=0YudJK

Thanks, best regards!!

It's not clear what your issue is. The force on the lever should cause the Gear Shift Type to change and Gear Shift State to move through the steps that may cause the ignition cut. So be sure to log those channels to know what is expected.

But I think you should be logging the shift data at 100hz minimum so you can really understand what is happening.

Also log Engine Speed Limit (and Engine Speed Limit State) at 50hz or higher. I suggest you utilize Gear Shift Engine Speed Limit Mode, and play with the values in the Gear Shift Engine Speed Match to achieve the best rev-matching and smoothest shifts.

Hi David,

Thank you very much for responding, sorry for the delay.

The problem is that the "gear shift status" channel doesn't always shift with the same force, or at least that's what we see. For example: we have it set to 230 N, once it shifts to 300 N and another time to 180 N, and so on.

Motec recommended updating the firmware as a first step, since we have a very old one, and they told us that among the improvements is gear shifting. I've always wanted to do it, but I'm very cautious and I'm afraid, especially when you're in a hurry before each race.

When iupdate the firmware, if you have any advice or tutorials, I'd appreciate it. We'll follow the configurations you recommended and discuss them.

Thanks,best regards!

Of course the force is not always the same - sometimes the gear dogs align and it goes in with different force. But the REQUEST to start the process, begins with Gear Shift Type changing. And I think you will find this begins at your programmed threshold, you just need to log it at a sufficiently high rate to not miss it. After that the force on the lever doesn't matter (as long as it is enough to actually allow the gear change).

Updating the firmware from a very old one may require a bit of setup. Ask your dealer to give you a hand, you can do the upgrade offline, and you don't have to load (or keep) the new package into the ECU until you are confident it is right.

What package / firmware version are you using currently?

Hi,

The package is GPR-DI, firmware 01.05.0005.