Cruise Control Overshoot / Undershoot

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Hugh
Posts: 49
Joined: Thu May 19, 2016 7:54 pm

Cruise Control Overshoot / Undershoot

Post by Hugh » Sat Aug 31, 2019 9:01 pm

We have a number of average speed cameras in my part of the world.

Best way to keep your license is to sit at the speed limit and use of cruise control.

I find that the speed overshoots then undershoots on cruise.

In SCal there is a Pedal Proportional Correction and a Pedal Target Integral gain.

I had expected there would be a Throttle position correction rather than a Pedal Position correction.

What is the best way to use Pedal Proportional Correction and Pedal Target Integral gain to hold the cruise speed steady?

Thanks

Hugh

MiSTI
Posts: 3
Joined: Wed Feb 07, 2018 10:16 pm

Re: Cruise Control Overshoot / Undershoot

Post by MiSTI » Mon Sep 02, 2019 7:39 am

Hi Hugh!

Have you logged what the proportional correction and integral gain is doing?

If so, please attach it.

I would guess that your integral gain is too high.

Ryan.g
Syvecs Staff - Caretaker
Posts: 280
Joined: Fri May 30, 2008 3:05 pm

Re: Cruise Control Overshoot / Undershoot

Post by Ryan.g » Mon Sep 02, 2019 8:38 am

S7/S8/S12

Nice update for Cruise has just been released which allows Cruise Control Speed Nudging like a OEM Car. WIll be coming for S6 later in the month as that is a different firmware tree.

Example Cal of New Cruise updates here which you can look at and even copy some of the values
Attachments
1.674 Cruise Great.SC
(568.96 KiB) Downloaded 107 times

Hugh
Posts: 49
Joined: Thu May 19, 2016 7:54 pm

Re: Cruise Control Overshoot / Undershoot

Post by Hugh » Mon Sep 02, 2019 8:44 am

Hi MiSTI,

Not logged what the ECU is doing, hadn't thought to do that, was just planning to play with the numbers till I got the cruise accurate. Now you have suggested it, I will set the parameters to log to see what it tells me.

Part of the reason for wanting to sort cruise is I would also like to try the "Vehicle Speed Tuning" option in SCal, which I assume allows you to set a particular cruise RPM that you can enable to watch different load site performance at a given RPM for on the road mapping.

We have plenty of hills where I stay, so thought that it would be interesting to see the fuel performance across various load sites if you hold the RPM value steady in the middle of the RPM range for the Map Cell.

Thanks

Hugh

Hugh
Posts: 49
Joined: Thu May 19, 2016 7:54 pm

Re: Cruise Control Overshoot / Undershoot

Post by Hugh » Mon Sep 02, 2019 8:52 am

Ryan.g wrote:
Mon Sep 02, 2019 8:38 am
S7/S8/S12

Nice update for Cruise has just been released which allows Cruise Control Speed Nudging like a OEM Car. WIll be coming for S6 later in the month as that is a different firmware tree.

Example Cal of New Cruise updates here which you can look at and even copy some of the values
Thanks Ryan,

What is the PassPhrase to open the example Cal?

Cheers

Hugh

Ryan.g
Syvecs Staff - Caretaker
Posts: 280
Joined: Fri May 30, 2008 3:05 pm

Re: Cruise Control Overshoot / Undershoot

Post by Ryan.g » Mon Sep 02, 2019 11:15 am

Here unlocked
Attachments
1.674 Cruise Great.SC
(568.96 KiB) Downloaded 25 times

Hugh
Posts: 49
Joined: Thu May 19, 2016 7:54 pm

Re: Cruise Control Overshoot / Undershoot

Post by Hugh » Mon Sep 02, 2019 8:01 pm

Thanks Ryan,

The Cruise Control Speed Nudging upgrade looks to be a great modification, will be great for creeping up on the average speed cameras

Hugh
Posts: 49
Joined: Thu May 19, 2016 7:54 pm

Re: Cruise Control Overshoot / Undershoot

Post by Hugh » Thu Oct 10, 2019 7:55 pm

Hi Ryan,

how is progress with the S6 Plus cruise control option?

Thanks

Hugh

Ryan.g
Syvecs Staff - Caretaker
Posts: 280
Joined: Fri May 30, 2008 3:05 pm

Re: Cruise Control Overshoot / Undershoot

Post by Ryan.g » Thu Nov 14, 2019 1:20 pm

Now done Hugh

Sorry for the delay

viewtopic.php?f=6&t=30&p=6688#p6688

Hugh
Posts: 49
Joined: Thu May 19, 2016 7:54 pm

Re: Cruise Control Overshoot / Undershoot

Post by Hugh » Thu Nov 14, 2019 4:25 pm

Thanks Ryan,

Appreciate the effort to add functionality.

I look forward to testing the additional functionality.

Cheers

Hugh

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