Hello folks, can someone help with my question please.

 

My car seems to brake by itself sometimes, the car slows much more rapidly than I expect when I ‘coast’. Then there are also lots of occasions when it slows gently (normally). I can’t see much about this in the owners manual except it mentions the 48v battery getting recharged from braking.

 

This isn’t due to slowing for a hazard or speed limit as it seems to do it in all situations - but not every time I release the throttle.

 

Do all cars with the e-tec engine do this?

Gordon.

I drove a 1.0 e-Tec Octavia for about five months a few years ago. It had a similar behaviour to that which describe; but as it was a loan car I never tried to work out exactly what it was doing, just assumed a quirk of the e-Tec system.

1 hour ago, Gordon55 said:

Hello folks, can someone help with my question please.

 

My car seems to brake by itself sometimes, the car slows much more rapidly than I expect when I ‘coast’. Then there are also lots of occasions when it slows gently (normally). I can’t see much about this in the owners manual except it mentions the 48v battery getting recharged from braking.

 

This isn’t due to slowing for a hazard or speed limit as it seems to do it in all situations - but not every time I release the throttle.

 

Do all cars with the e-tec engine do this?

Gordon.

 

Maybe the battery was 80%+ when behaving normally and could not accept any or a very low amount of regen braking energy vs. a low battery that could take all the current from the regen braking

I imagine that it is partly related to the ECO Assist and the Front Assist. The ECO Assist seems to rely on the navigation data (speed, road layout, gradients). I also have the impression that the Front Assist reacts proactively to traffic, such as slowing vehicles, etc. In some cases, the car interrupts coasting, restarts the engine, and you can clearly feel a delay.

Thanks for the answers, I should say the car is in comfort mode, and there is often no traffic near so it’s not slowing for that.  It also happens when I’m under the speed limit so not that.  As for gradient affecting it, there is sometimes a slight slope but I’m sure it happens on a level road too.

Try deactivating ECO-Assist on your next drive.

Your Nav Data is up to date?

Mine does it when approaching most speed limits and roundabouts.

41 minutes ago, blackh0le said:

Try deactivating ECO-Assist on your next drive.

Your Nav Data is up to date?

Thanks, will do - I’ll have to find it first!

 

Yes software and map is up to date according to the online check I did a couple of days ago.