Enable Heater when engine start.

Support forum for the Lambda Shield designed to connect Bosch LSU 4.9 wideband oxygen sensors to Arduino projects.
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billlask
Posts: 3
Joined: 20 Nov 2019 13:26

Enable Heater when engine start.

Post by billlask » 09 Jun 2024 13:08

Hello,

i want to ask if anyone know how can i read the temperature before satrt heating the sensor.
I want to detect from temperature that the engine is starting so after that start heating the sensor.
With this i think i can protect the sensors for failure

Thank you

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Christian_Bylund
Posts: 264
Joined: 07 Mar 2015 18:09

Re: Enable Heater when engine start.

Post by Christian_Bylund » 16 Jun 2024 20:55

billlask wrote:
09 Jun 2024 13:08
Hello,

i want to ask if anyone know how can i read the temperature before satrt heating the sensor.
I want to detect from temperature that the engine is starting so after that start heating the sensor.
With this i think i can protect the sensors for failure

Thank you
Hello, there is actually a pre-heating water condensation phase implemented already in our example code following the Bosch recommendation for LSU 4.9 sensors. To answer your question, the adcValue_UR variable is used to measure the temperature of the sensor.
Best Regards,
Christian Bylund
Bylund Automotive AB

billlask
Posts: 3
Joined: 20 Nov 2019 13:26

Re: Enable Heater when engine start.

Post by billlask » 17 Jun 2024 23:41

Thank you for answering.
i have see your pre-heating example code that works perfect.
My problem is that many time i will urn on the ignition and i will start the engine 5 minutes ago.
The time that i start the engine he LSU has full heat and this is my problem about sensor fail.

That i want to do is to understand from the heat that the engine is running and after that run your pre-heating algorith.

I have log the adcValue_UR and I increase the heat on the sensor but the value has no change.
I make the same test to add small buty abiut 20/255 on the heater but again no change on UR what i heat the sensor.

Any other idea?

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