Author Topic: WBO2 Heating  (Read 10185 times)

Offline Tcal

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WBO2 Heating
« on: December 22, 2007, 05:53:51 pm »
What´s the recommended heating time to that LSU4 sensor?
If that time is too short, will it cause problems like false reading or something?

Offline dnb

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Re: WBO2 Heating
« Reply #1 on: December 22, 2007, 10:48:24 pm »
I use 25 seconds.  It seems to work OK.

Offline Tcal

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Re: WBO2 Heating
« Reply #2 on: January 01, 2008, 09:20:48 am »
I´d like to hear others comment on this too, anybody?
What are your experiences on this, i´ve read somewhere that normal ecus heat that LSU about 20 secs??

Offline rob@vems.co.uk

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Re: WBO2 Heating
« Reply #3 on: January 01, 2008, 01:24:49 pm »
The sensor's heater is monitored and a reading is not given until it reaches its operating temperature.
Which warm-up time setting are you thinking of?

Offline Tcal

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Re: WBO2 Heating
« Reply #4 on: January 01, 2008, 02:56:21 pm »
So if i set it like 2 seconds, it won´t give me any reading before it´s heated properly and is giving correct value? correct?
Will this cause problems?

I have that time set to 40 secs now.

Offline rob@vems.co.uk

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Re: WBO2 Heating
« Reply #5 on: January 01, 2008, 04:07:52 pm »
Where are you setting this?

Offline Tcal

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Re: WBO2 Heating
« Reply #6 on: January 01, 2008, 04:43:39 pm »
Settings -> EGO control -> Warmup time.

Hmm i did think this again..
That doesn´t change that O2 heating, it´s the time when vems starts to show/use lambda ?
It´s the warmup ramp in settings -> wideband settings, that change´s that heating time ?
« Last Edit: January 01, 2008, 05:37:27 pm by Tcal »

Offline rob@vems.co.uk

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Re: WBO2 Heating
« Reply #7 on: January 02, 2008, 02:03:47 pm »
Leave the wideband settings alone! They should be setup as per the instructions here: http://www.vems.co.uk/forum/index.php?topic=55.0
As for the EGO value - 60seconds is usually enough.

Cheers

Rob

Offline Tcal

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Re: WBO2 Heating
« Reply #8 on: January 03, 2008, 09:37:23 am »
Those WB settings are bit modified by the previous owner:

fallback V after maxt is 96

Pump KP 64
Pump KI 46
Pump KD 8

Other´s values are as in instructions...
I don´t know the reason why those are changed.
IMO are those pump settings more aggressive than factory or how would those make difference?

And what does that fallback change?

Maybe i should try those "original" settings too and see if that lambda behaves differently.

And the reason why i´d like to set that EgoC on as fast as possible is because in cold weather like today (-28c) engine doesn´t run as it should when warm engine is started and that IAT looks like -14. No problems usually in norm temperatures.

Offline rob@vems.co.uk

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Re: WBO2 Heating
« Reply #9 on: January 03, 2008, 10:04:10 am »
Use the suggested PID settings, these are the ones that have been developed specifically for driving this sensor.
What do they change? I cant honestly say as I have very limited knowledge on the way the Pump and Nerst closed-loop control actually works.

Its going to take an amount of time to get the sensor hot enought to provide a correct reading, no matter what you do.

If you are having problems at lower temperatures then this is really a cold start enrichment issue rather than the way the sensor is being driven - chances are you're way too lean.  Although this graph is for crank fueling it does show how the fuel requirement increases massively with small temperature changes as things get colder - note the difference in fueling between -15 and -25

« Last Edit: January 03, 2008, 10:05:55 am by rob@vems.co.uk »