DENSO's A/F Sensors

Hardware inside and outside of the ECU
Post Reply
User avatar
russian
Site Admin
Posts: 9779
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

DENSO's A/F Sensors

Post by russian » Thu Jan 03, 2019 12:45 am

@ has mentioned a less-narrow oxygen sensor, Denso calls these "A/F Sensors" which measures A/F ratios from approximately 12:1 to 19:1

http://www.denso-am.eu/media/102388/dels14-0001.pdf
Q9: What is the difference between Zirconia Lambda
Sensors and A/F Sensors?
A: In general A/F Sensors are more sensitive and efficient than
conventional Zirconia Lambda Sensors. This is because of the way
each type of Sensor measures the air/fuel ratio, and the different
output signals they produce to indicate the result:
Air/fuel ratio
> A Zirconia Sensor indicates whether the air/fuel ratio is either
above or below Lambda 1.00. The engine ECU alters the fuel
quantity step by step until the Sensor indicates that the mixture
is wrong again. At this point the ECU starts correcting again,
step by step in the other direction. This method results in a
relatively slow and constant ongoing correction around Lambda
1.00, never able to exactly maintain Lambda 1.00.
> An A/F Sensor indicates the exact air/fuel ratio value. This
means that the engine ECU knows how far off the air/fuel ratio
is from Lambda 1.00, and therefore also knows how much it
needs to correct the fuel injection. This allows the engine ECU
to correct the injected fuel quantity to achieve, and maintain
Lambda 1.00 almost immediately.
Same page shows output values.

@ do you know any part numbers or how to distinguish Zirconia from A/F Sensor from Titania Sensors?
Attachments
denso_a_f.png
denso_a_f.png (25.2 KiB) Viewed 549 times
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
russian
Site Admin
Posts: 9779
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: DENSO's A/F Sensors

Post by russian » Thu Jan 03, 2019 1:42 am

https://www.carid.com/images/denso/emis ... atures.pdf

honda PN is 36531-PAA-307
36531-PAA-L22 is an older PN
36531-PAA-L23 as well
"approximately 0.4 V constantly applied to the air/fuel
sensor, which outputs a current that varies in accordance with the oxygen concentration in the exhaust
gas. The ECM converts the changes in the output current into voltage allowing a response that is directly
proportional to the input of the present detected air/fuel ratio
Denso 234-9025
Honda F23B
HONDA ACCORD 1998-2000

Toyota uses Denso 234-9008
https://www.autoequipment.com.au/image/ ... rt%203.pdf

I guess 02-05 Subaru Impreza 234-9011 is of the same kind?
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
russian
Site Admin
Posts: 9779
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: DENSO's A/F Sensors

Post by russian » Thu Jan 03, 2019 3:03 am

More info to really get yourself confused http://alflash.com.ua/o2calif.htm
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
mobyfab
Posts: 138
Joined: Tue Oct 29, 2013 10:09 am
Location: Versailles, France
Soldering skill: yes
Coding skill?: yes

Re: DENSO's A/F Sensors

Post by mobyfab » Thu Jan 03, 2019 2:23 pm

Equivalents:
Bosch 13493
Borgwarner OS1091
NTK 24809

OrchardPerformance
contributor
contributor
Posts: 144
Joined: Tue Jul 24, 2018 8:55 pm
Soldering skill: yes
Coding skill?: yes

Re: DENSO's A/F Sensors

Post by OrchardPerformance » Wed Jan 09, 2019 1:48 pm

Given that the Bosch LSU 4.9 is now so common and cheap does it make sense to spend time looking into something more custom and incapable of the same AFR range?

To me an onboard interface for an LSU 4.9 makes the most sense given that most of the aftermarket uses them and a good proportion of the OEM manufacturers are using them. They are even beginning to become junk yard available as BMW and VW have been using them since about 2010.
For what it's worth we use them nearly exclusively where I work (well apart from the £15k Lambda CAN modules but no one is DIY using those. :lol: )

User avatar
russian
Site Admin
Posts: 9779
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: DENSO's A/F Sensors

Post by russian » Wed Jan 09, 2019 1:51 pm

OrchardPerformance wrote:
Wed Jan 09, 2019 1:48 pm
Given that the Bosch LSU 4.9 is now so common and cheap does it make sense to spend time looking into something more custom and incapable of the same AFR range?
I think you are right, we would probably not be looking into those further.
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
mobyfab
Posts: 138
Joined: Tue Oct 29, 2013 10:09 am
Location: Versailles, France
Soldering skill: yes
Coding skill?: yes

Re: DENSO's A/F Sensors

Post by mobyfab » Wed Jan 09, 2019 8:28 pm

OrchardPerformance wrote:
Wed Jan 09, 2019 1:48 pm
Given that the Bosch LSU 4.9 is now so common and cheap does it make sense to spend time looking into something more custom and incapable of the same AFR range?

To me an onboard interface for an LSU 4.9 makes the most sense given that most of the aftermarket uses them and a good proportion of the OEM manufacturers are using them. They are even beginning to become junk yard available as BMW and VW have been using them since about 2010.
For what it's worth we use them nearly exclusively where I work (well apart from the £15k Lambda CAN modules but no one is DIY using those. :lol: )
Because it's OEM on many cars and it doesn't require a controller.

Post Reply