i want to reading Air Fuel Ratio

[ceturan]

Hello everybady;

i have got a İmpreza (1.5R 2007 model ) and i use to Hobd 1.3.2 free version.

and i want to reading Air Fuel Ratio .

I can read with Torque Pro, but I can not read with Hobd.

Torque has a special ID ff1249 and it is working. i dont know Torque used witch OBD PID.

i guess used, 01 24 (Oxygen Sensor 1 AB: Fuel–Air Equivalence Ratio). and i checked Wikipedia , formula is 2/65536(256A+B)

but i checked source code of the Hobdcore.dll ver 0.53 has a different calculation method and formula.

If I think that the formula is not wrong ,I can not do this.

i create a new ecuxlm and try ;

<parameter id="A/F">
<description>
<name>Air Fuel Ratio</name>
<unit></unit>
</description>
<address>
<byte>0x24</byte>
</address>
<valueab>0.0000305</valueab>
</parameter>

return value :32651 , it is not correct value .

Please help me for correct parameter and read for AF/R

And,

Which configuration should I use.

Thank you.

[kdika]

Hello.

do:
-screens/setting/system settings/logging level - trace
-connect auto
-screens/sensors list/click to Lambda_b1s1 this is "01 24 (Oxygen Sensor 1 AB: Fuel–Air Equivalence Ratio). and i checked Wikipedia , formula is 2/65536(256A+B)"

or use code

Код: Выделить всё

<parameter id="A/F">
    <description>
      <name>Air Fuel Ratio</name>
      <unit></unit>
      <description>Air Fuel Ratio</description>
    </description>
    <raw>0124</raw>
    <word-0>0.0000305</word-0>
    <offset>0</offset>
  </parameter>


Make a screen return value A/F and Lambda_b1s1. And send log.txt

[ceturan]

Thank you ,

I tried this code and nothing changed.

upload log.txt

Thank you from now.

[kdika]

[TRACE] 2018-7-28 9:35:14.220[OBD2Engine] ----> OBD2.Lambda_b1s1
[TRACE] 2018-7-28 9:35:14.226[OBD2Engine] -> SENSOR_HEADER_ACK
[TRACE] 2018-7-28 9:35:14.233[OBD2Engine] SendCommand:0124
[TRACE] 2018-7-28 9:35:14.240[OBD2Engine] -> SENSOR_ACK
[TRACE] 2018-7-28 9:35:14.506[OBD2Engine] HandleReply: 41 24 7E 41 42 4E

7E 41=32321

32321*0.0000305=0.9857905

here is the exact meaning 0.9857905

you have what is displayed?

[ceturan]

Yes, Lambda is 0.99,

But, I was trying to find a value of 14.7:1 .

I found that I was looking for .

3 ve 4. byte (42 4E) is DEC 16974

16974 * 8/65535= 2.072 V

impreza has Wideband Front O2 Sensor, it is has output 0 between 5 v.

To see as 14.7 , Voltage x 2 +10

2.072 x 2 +10 =14.14



maybe needed calibration for reading, close to real value For my car = voltage x1,7 +11

I think the car is a bit rich. 14.52:1

Thank you for helping to solve the problem.

[kdika]

Yes, Lambda is 0.99,

But, I was trying to find a value of 14.7:1 .

I found that I was looking for .

3 ve 4. byte (42 4E) is DEC 16974

16974 * 8/65535= 2.072 V

impreza has Wideband Front O2 Sensor, it is has output 0 between 5 v.

To see as 14.7 , Voltage x 2 +10

2.072 x 2 +10 =14.14



maybe needed calibration for reading, close to real value For my car = voltage x1,7 +11

I think the car is a bit rich. 14.52:1


Thank you for helping to solve the problem.

Код: Выделить всё

<parameter id="A/F">
    <description>
      <name>Air Fuel Ratio</name>
      <unit></unit>
      <description>Air Fuel Ratio</description>
    </description>
    <raw>0124</raw>
    <word-2>0.000244</word-2>
    <offset>10</offset>
  </parameter>

[ceturan]

thank you kdika

it is working code; for my O2 sensor

<parameter id="AF/R">
<description>
<name>Air Fuel Ratio</name>
<unit>:1</unit>
</description>
<address>
<byte>0x24</byte>
</address>
<valuecd>0.0002075</valuecd>
<offset>11</offset>
</parameter>