DIYEFI.org Forum

I feel kinda responsible for this mess, now :( The heater is a variable voltage DC design. One of the big problems with most AFR/LAMBDA/UEGO controllers is noise induced by the PWM control of the heater. Up to 2 Amps is constantly being switched on and off which causes the ground plane to jump arou...

Can't we all just get along? :P Poking around the signals, it looks like they ARE using a controlled current source. But, not in any normal way. The red (pump) wire is always at 2.5v. The orange wire has a 1kHz square-wave signal on it. So does the black wire. The green wire seems to not be connect...

If Delsolid will accept my apology then, I apologize for posts made after; Tue Feb 09, 2016 12:13 am, I still stand by the; Tue Feb 09, 2016 12:13 am post, and prior.

1) Hmm, I must be thinking about the pump cell all together wrongly, then. I was assuming it had some sort of impedance/resistance and that the ratio of 62 to that would define how much more current you got for your Voltage, however I've not read up on the details of these things at all, so excuse ...

1) Without the resistor present you gain an additional 0.125 volts of headroom to drive the pump cell, 0.7 Lambda is ~2ma so 62 ohms x 2ma = 0.125 volts, it is not a big difference. I am pretty sure there is a measurement resistor in their design, it is just probably a different value. If there is n...

I do not need to know your design. I rely on physics, the gas in a wideband sample chamber is reduced or oxidated which depends on the number of O2 ions driven into or out of the pump cell, O2 ions are driven by charge from the controller. For a fixed geometry chamber with a fixed amount of gas at a...

I am sure many people think I am being dishonest in the same way you are but just taking the opposite side, widebands are a niche type of product and not many people know what is going on. I knew one day I would run into someone like you on a forum, and most people who reads the posts will not know ...

I made a mistake in the post above, You need to put a multimeter in line with the pump cell wire, cut the red wire on the sensor and put a multimeter between the wire, well not a multimeter but a scope with a measurement resistor as it will give you instantaneous current where as a multimeter will j...

Do you want to know why I am assuming you are exceeding the current limit, because I push some of my product at the limit and I do not get your 20ms response time. Current is charge over time, when time shrinks current goes up. Scope across the 61.9 ohm measurement resistor in your system and calcul...

Bosch 4.9 datasheet "Y 258 E00 015e Seite/Page 3 von/of 13 Datum/Date 14.6.2005" Max. pumping current into pump cell (Ip) - for rich gas signal (λ≥0,65) ≥ -9 mA - for lean gas signal (air) ≤ 6 mA This is a link to the datasheet I have, https://www.dropbox.com/s/qqbjnryncjxrzsm/LSU_4_9_data...