How to improve knock detection?

Support forum for the Knock Shield designed to connect knock sensors to Arduino projects.
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knockretard
Posts: 1
Joined: 29 Apr 2023 12:01

How to improve knock detection?

Post by knockretard » 29 Apr 2023 12:44

Hello, I have setup knock shield using https://github.com/Bylund/Knock-Shield- ... xample.ino

It was easy to do because your manual is very good.

Only thing I changed to suit my engine was the Setting band pass frequency

I have a V8 with 102.3mm diameter pistons so I used this calculator: https://phormula.com/knock-frequency-calculator/ to get a frequency of 5.6khz

According to the Technical Manual (http://www.bylund-automotive.com/educat ... Shield.pdf)

the closest value is: 5.68 kHz 0x24 0b00100100

Here is a sample of my log. I am using 2 knock sensors Bosch KS4-P. I just did some light driving. I have conservative timing and high octane fuel.
Question 1: Does this look correct? I'm a little surprised that results aren't consistent between both sensors. On this V8 they are mounted on the outside of the iron block, one on each side of the v8.
Question 2: how do I know whether I should adjust the gain or KNOCK_THRESHOLD_LEVEL?

Code: Select all

Device reset.
Configuring SPU: 0x44, 0x24, 0xA2, 0xCA
Channel 1:  6% - Channel 2:  5%
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Channel 1: 58% - Channel 2: 19%
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Channel 1: 68% - Channel 2: 47%
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Channel 1: 14% - Channel 2: 12%
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Channel 1: 22% - Channel 2: 11%
Channel 1: 16% - Channel 2: 11%
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Channel 1: 17% - Channel 2: 10%
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Channel 1: 36% - Channel 2: 22%
Channel 1: 49% - Channel 2:  8%
Channel 1: 18% - Channel 2: 10%
Channel 1: 56% - Channel 2: 14%
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Channel 1: 17% - Channel 2: 10%
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Last edited by Christian_Bylund on 30 Apr 2023 10:19, edited 1 time in total.
Reason: Output as code.
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User avatar
Christian_Bylund
Posts: 259
Joined: 07 Mar 2015 18:09

Re: How to improve knock detection?

Post by Christian_Bylund » 30 Apr 2023 10:50

Hello!
knockretard wrote: ↑
29 Apr 2023 12:44
 It was easy to do because your manual is very good.
Thank you, it seems you have understood it very good!
knockretard wrote: ↑
29 Apr 2023 12:44
 Question 1: Does this look correct? I'm a little surprised that results aren't consistent between both sensors. On this V8 they are mounted on the outside of the iron block, one on each side of the v8.
I agree with you, it looks a bit asymmetric. Have you tried swapping the sensors to see if it follows the sensor or if it is the actual reading? Make sure the sensor is mounted on a good plane and clean surface.
Image
Referencing the datasheet of the sensor.
knockretard wrote: ↑
29 Apr 2023 12:44
 Question 2: how do I know whether I should adjust the gain or KNOCK_THRESHOLD_LEVEL?
If you reach the KNOCK_THRESHOLD_LEVEL without the engine knocking I would reduce the gain. Often you want to know what is your safe level that you do not want to pass. Note, that you are a bit limited without engine speed.

There are plenty of videos discussion threshold levels, here is one example at 5:00.

Hope it helps.
Best Regards,
Christian Bylund
Bylund Automotive AB
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DaveK
Posts: 8
Joined: 12 Feb 2019 10:11

Re: How to improve knock detection?

Post by DaveK » 07 May 2023 15:00

Hi knockretard,
Just wanted to also raise the topic of mounting torque.
I assume you are aware of this anyway, but i wanted to add this for other readers of your post.
Make sure that both sensors are torqued to the recommended spec of 20 + or - 5 Nm.
Also try to use bolts or studs made from the same metal properties, EG: Don't use one 316 grade stainless bolt and a mild steel bolt on the other sensor.
Regards
Dave.
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