DYNOJET: TT AT vs PV Basic AT
HD EFI Guru
Joined: Jan 2008
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Why is it different for 2 o2 sensors? It simply means that the system does double duty.. After market V8 systems use 2 02 sensors. One in each head pipe at the collector.. What is the difference between 2 banks of o2 sensors and 2 cylinder 02 sensors other than one samples 2 sets of 4 cylinders and the other samples 2 sets of 1 cylinder? Sampling each cylinder seems better than a bank of 4 FWIW..
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From: poway
Your an engineer, think about the process and what is different. Then you will have the answer. If you cannot figure it out over the weekend I will come back and give you a few more hints. I do not feel it does anyone, any good, to just tell you everything. You need to use your head and figure some of it out on your own to learn and understand it better.
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Seasoned HDF Member
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From: poway
While I've done plenty close loop designs where most are types of signal processing are not like a 4 stroke motor.. Still the sonar stuff could require windowing the measurements using an event queue and a separate thread to collect and process analog inputs.. In my cases, the a2d conversion time was typically the greatest delay..
Last edited by Max Headflow; Jul 8, 2016 at 07:08 PM.
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HINT: Where is the sensor located and what is the volume of the chamber it is located in?
HINT: Is that volume the actual mixture from the cylinder? Is it diluted?
HINT: What's its refill rate?
Now compare to a car or truck
HINT: Is that volume the actual mixture from the cylinder? Is it diluted?
HINT: What's its refill rate?
Now compare to a car or truck
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From: poway
HINT: Is that volume the actual mixture from the cylinder? Is it diluted?
HINT: What's its refill rate?
Now compare to a car or truck
Now compare to a car or truck
Road Warrior
Joined: Mar 2013
Posts: 1,923
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From: Alorton, Illinois
Look at a inline 4 cylinder. One sensor in the collector. How many exhaust events happen in a second? Or pass over the sensor. Compare that to a front cylinder of a Harley with one sensor. How many exhaust events pass over this sensor in a second. 4:1 right?
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From: poway
Got that but what difference does it make?
Road Master
Joined: Mar 2007
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Here is what the actual voltage coming off a narrow band really looks like on a digital scope. This is my Harley running open loop and idling with fueling set very close to 14.7 AFR. You will see the voltage going up and down switch about half way thru the video as the O2 sensor sniffs AFRs slightly above or below 14.7 AFR.
This is what the signal would look like to the ECU.
The scale horizontally is .25 sec per vertical line
The vertical scale .5 volts per horizontal line
Andy
This is what the signal would look like to the ECU.
The scale horizontally is .25 sec per vertical line
The vertical scale .5 volts per horizontal line
Andy
Last edited by whittlebeast; Jul 9, 2016 at 06:36 PM.