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How Knock Detection System Works in the Ecoboost #4522741
09/21/17 11:27 PM
09/21/17 11:27 PM
Joined: Apr 2012
Posts: 9,823
Kendall, FL
wemay Offline OP
wemay  Offline OP
Joined: Apr 2012
Posts: 9,823
Kendall, FL


18 Sportage LX: M1AP 5W-20 + M1-104A
13 SFS 2.0T: PP 10W-30 + XG9688
Re: How Knock Detection System Works in the Ecoboost [Re: wemay] #4522776
09/22/17 01:19 AM
09/22/17 01:19 AM
Joined: Oct 2015
Posts: 284
Washington
Dylan1303 Offline
Dylan1303  Offline
Joined: Oct 2015
Posts: 284
Washington
Nice read ty


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
13 equinox 2.4 awd pp 5w30
Re: How Knock Detection System Works in the Ecoboost [Re: wemay] #4522991
09/22/17 08:08 AM
09/22/17 08:08 AM
Joined: Jun 2015
Posts: 4,412
New England
Virtus_Probi Offline
Virtus_Probi  Offline
Joined: Jun 2015
Posts: 4,412
New England
Yes, interesting article, thanks for posting!

I worked on the electronics for a knock detection system for a US OEM in the last millennium and a lot of this sounds familiar.
Our main role in the magic was generating the equivalent of the knock intensity value and that was an intricate task. A lot of filtering to reject signals from the piezoelectric sensors that were not related to knocking events and windowing to identify the cylinder as well as also reject non-knock stuff. The engine gurus at our customer told us that the ideal condition was to be knocking so lightly that the sensors would barely register it and the driver would never notice it...the said this gave them the best power and fuel efficiency. They also let us watch a prototype of the system running on the dyno and it was cool to watch it adjust to changes on the fly.


2014 Forester XT, 90000 miles
Last Change;
M1 5W30 d1G2
Tokyo Roki 15208AA170 filter
Re: How Knock Detection System Works in the Ecoboost [Re: wemay] #4523016
09/22/17 08:29 AM
09/22/17 08:29 AM
Joined: Jul 2017
Posts: 1,292
Douglas County, Colorado
bigj_16 Offline
bigj_16  Offline
Joined: Jul 2017
Posts: 1,292
Douglas County, Colorado
Very nice article. Easy read and very informative. What's interesting is that you don't really hear of LSPI issues with Ecoboosts, and this system probably plays a big part in that.

Re: How Knock Detection System Works in the Ecoboost [Re: wemay] #4523166
09/22/17 12:17 PM
09/22/17 12:17 PM
Joined: Sep 2002
Posts: 4,178
Lakeville, MN
MNgopher Offline
MNgopher  Offline
Joined: Sep 2002
Posts: 4,178
Lakeville, MN
The Octane adjustment ratio is readable using torque on an android phone. Interesting to monitor particularly when you hear folks say gas is gas. Definitively there is a difference and it is repeatable on what is all supposed to be 87 octane in this market. I've had OAR from .25 to -.3, depending on brand, an repeated over different fill ups. Other markets may be different.

Re: How Knock Detection System Works in the Ecoboost [Re: bigj_16] #4523177
09/22/17 12:33 PM
09/22/17 12:33 PM
Joined: Apr 2012
Posts: 9,823
Kendall, FL
wemay Offline OP
wemay  Offline OP
Joined: Apr 2012
Posts: 9,823
Kendall, FL
Originally Posted By: bigj_16
Very nice article. Easy read and very informative. What's interesting is that you don't really hear of LSPI issues with Ecoboosts, and this system probably plays a big part in that.


Yeah, looks like they got this pretty sorted from the start.


18 Sportage LX: M1AP 5W-20 + M1-104A
13 SFS 2.0T: PP 10W-30 + XG9688
Re: How Knock Detection System Works in the Ecoboost [Re: wemay] #4523830
09/23/17 08:06 AM
09/23/17 08:06 AM
Joined: Oct 2008
Posts: 19,193
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,193
Sunny Florida
I'm sure that Ford sweated the knock sensor development in the ecoboost engines since they are committed to their use in nearly every platform...


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: How Knock Detection System Works in the Ecoboost [Re: wemay] #4540109
10/11/17 10:45 AM
10/11/17 10:45 AM
Joined: Jun 2015
Posts: 4,412
New England
Virtus_Probi Offline
Virtus_Probi  Offline
Joined: Jun 2015
Posts: 4,412
New England
Very strange, when I look at the summary page for "Interesting Articles" I see a post by Molakule from 9/27...but it's not here when I visit the thread.
????


2014 Forester XT, 90000 miles
Last Change;
M1 5W30 d1G2
Tokyo Roki 15208AA170 filter
Re: How Knock Detection System Works in the Ecoboost [Re: wemay] #4546791
10/18/17 03:39 AM
10/18/17 03:39 AM
Joined: Dec 2002
Posts: 41,522
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 41,522
'Stralia
Cool, not something I've ever thought about or looked into.

Thanks

Re: How Knock Detection System Works in the Ecoboost [Re: wemay] #4549869
10/21/17 05:12 AM
10/21/17 05:12 AM
Joined: Mar 2015
Posts: 488
Australia
B320i Offline
B320i  Offline
Joined: Mar 2015
Posts: 488
Australia
How does Knock control work in newer cars?
As best as I can tell standing at traffic lights, it doesn't! If the aim is for inaudible, but existent knocking/pinging, then they're quite clearly failing. shocked


'93 BMW 320i 217,000km - Valvoline Engine-Armour 15w40, Mann Filter.
Re: How Knock Detection System Works in the Ecoboost [Re: B320i] #4550799
10/22/17 07:40 AM
10/22/17 07:40 AM
Joined: Oct 2008
Posts: 1,560
Flatlands of Indiana
JetStar Offline
JetStar  Offline
Joined: Oct 2008
Posts: 1,560
Flatlands of Indiana
HD (Delphi) and possibly others are using spark analysis to detect knocks, the link is about all I could find about it. I noticed it when I was leafing through the FSM for my 2017 Wide Glide.

https://www.cycleworld.com/2015/07/23/technical-update-detonation-detection-by-analyzing-ionization/

http://bmwmotorcycletech.info/ionization-current-sensing-ignition-susbystem.pdf

http://www.searchautoparts.com/motorage/...ense-technology





Last edited by JetStar; 10/22/17 07:48 AM.

My weakness is I love all motorcycles regardless of brand
2017 Wide Glide
2016 Suzuki DR650
2015 Road Glide
2007 Yamaha FZ1
1978 Suzuki GS1000 (now 1085)

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