knocking noise during auto pilot.

[agoldman]

anyone else notice a knocking noise when auto pilot slows and then re-engages, mostly when going fairly slow or from auto stop/go in traffic. As soon as I turn auto pilot off, the clicking sounds stop. Just started today.

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[TruWrecks]

Are you driving a Tesla?

 

[TruWrecks]

Sorry. Couldn't resist.

 

[agoldman]

Are you driving a Tesla?

ha, no, but I could be if this keeps up. I can't imagine a Ford shop would have any clue what to do with this problem.

 

[TruWrecks]

Might want to get that checked at a dealer. Something might be loose.

 

[agoldman]

Might want to get that checked at a dealer. Something might be loose.

Yeah I may just live with it till my GT arrives. If it ever arrives. I picture a weeks long stay at the dealer while they pass emails back and forth to Ford while scratching their heads about the issue.

 

[digitalhexcode]

anyone else notice a knocking noise when auto pilot slows and then re-engages, mostly when going fairly slow or from auto stop/go in traffic. As soon as I turn auto pilot off, the clicking sounds stop. Just started today.

Here’s a thread with a knocking noise that was solved in settings.
https://www.macheforum.com/site/threads/strange-‘knocking’-sound-solved.7833/

 

[SnBGC]

Auto pilot?
I am so confused.....???

 

[agoldman]

Here’s a thread with a knocking noise that was solved in settings.
https://www.macheforum.com/site/threads/strange-‘knocking’-sound-solved.7833/

worth a try. (didn't seem to do anything after quick try) what it sounds like is when the system starts to brake and resume at fairly slow speeds, it seems like a slight clanking noise in the linkage as the system engages. Not as much at higher speeds. OPD made no difference on or off. But normal non assist operation is perfectly quiet.

 

[TruWrecks]

Auto pilot?
I am so confused.....???

Autopilot is a Tesla or Aircraft name. Ford calls it Co-Pilot 360.

 

[agoldman]

Autopilot is a Tesla or Aircraft name. Ford calls it Co-Pilot 360.

And technically in settings, I think it is just driver assist, or something vaguely similar.

 

[TruWrecks]

And technically in settings, I think it is just driver assist, or something vaguely similar.

It is all Driver Assist. Even in Aircraft. A pilot is not allowed to leave the controls unless a trained co-pilot is at the controls.

You are responsible to drive your car no matter what the aid is called. That is the law.

 

[noway]

The strange things happening at close to walking speed with the cruise control is the brakes having to switch over from regen to hydraulic mode. The cruise control system does not seem to be tweaked for electric mode and just uses the brakes just as it does with an ICE vehicle (using the same system).

Normally when using one pedal mode and releasing the accelerator completely and letting the car go to a full stop it has to switch from regen braking into friction brakes right before it stops completely. This seems to be made smooth by braking as far as possible with the regen and then at about walking speed it will "release" the regen braking and slowly engange the friction brakes, which makes the car feel like it is almost releasing the brakes completely right before stopping and slowly inching forward while applying the friction brakes.

Problem seems to be that the cruise control does not seem to like that the car does not keep braking all the way, and will at last second hog the brakes to try to keep its braking until full stop at constant force (when it wants to stop it needs to stop, and this transition where it will brake less right before stopping interferes with the cruise controls intended and calculated brake distance)

The same thing might also happen when starting to drive from a full stop. It will think that when it releases the brakes the car should start to creep forward and it will try to release the brakes slowly while accelerating, so keeping the brakes on slightly while starting to accelerate.

I think this will get sorted out at some point, the system needs to be adjusted for the EV brake and acceleration characteristics around zero which is very different from ICE with an engine pushing forward at all times. This is also very much noticeable in the auto park mode where it really pushes the brakes while doing walking speed stop and go. It simply wants to use the brakes to control the speed, which does not work very well with an EV.

So, knocking sound is the hydraulics in the brake system working, which only does work at close to walking speed and when braking hard.

 

[agoldman]

So, knocking sound is the hydraulics in the brake system working, which only does work at close to walking speed and when braking hard.

Yes, what you have described is what it "seems" like is happening in real time to me. Except it happens now up to about 20 mph too. But only when it is slowing down or releasing to speed back up. Seems that some linkage has loosened up or something that only is affected by the stop and go churning of cruise control. But I question why after 8 months this just started happening today?

 

[noway]

There are no linkages or any mechanical components which is active by cruise control only You should have the same noises when driving without it enabled if it is mechanical.

Try driving manually, with one pedal mode off, and try braking, etc. it is the same thing happening when doing it manually, just it seems the cruise control is more aggressive, but should be able to trigger it manually.

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