Quote:
Originally Posted by George Tyler
yes, that is true, but at idle it is open loop, also at full throttle. I am thinging of making a ECU that controls mixture by spoofing the O2 sensor.... it has a pam of throttle opening, manifold pressure, rpm etc and stores what the engine normally does, then with the cyl deactivation on it generates the O2 signal that makes the correct mixture.
Another way to do it is to have 2 separate exhaust systems, with the O2 sensor in only one that is not going to be deactivated. they can join further down
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I think you do need a wideband oxygen sensor to close the fuel loop
whenever cylinder deactivation is in progress. Rugular O2S can't see the
high lambda area, then the engine will loss the control.
If you place the O2 sensor in only one that is not going to be deactivated,
the resullt is you could only run deactivation in a fixed pattern, not DCD
which deactivates and activates every cylinders alternatively, resulting a
balanced thermal state in all the cylinders within the engine. In case of
fixed deactivation, some cylinders may run hotter than others; and some
cylinders may run cooler than others, thermally un-balanced, un-reasonable
and un-pleasant.