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Old 01-30-2013, 10:20 PM   #11 (permalink)
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how would you plan on forcing it into open loop? not too many ways of doing that without making the ECM start setting codes. you MIGHT be able to simulate a wide open throttle during the DFCO... that would give you your open loop, but if the ECM is looking at O2 voltage during this(some do as a test of the fueling system), it would still not be very happy.

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Old 01-30-2013, 10:31 PM   #12 (permalink)
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I think the root of the problem is that many different cars/engines handle these situations in different ways. Making a single system with a single strategy will only work on a limited range of vehicles.

I think we need to identify a target range of vehicles that have a similar system, that is a preferred car here on ecomodder.com and that would benefit a larger number of members. We can expand from there later.
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Old 02-05-2013, 11:48 AM   #13 (permalink)
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The conclusions I have reached...

Hi all,

1. The ways cars monitor and control their systems are many and varied. Therefore, there will be no one-size-fits-all solution,

2. There are so many ways, and so many solutions, that any solution will only help a few people,

3. DFCO is a poor version of what you can do far better with EOC or coasting in idle.

On that basis, I see little point in designing "a board"to solve this problem that doesn't really exist.

Instead, I'll look for another project that will more easily help more people.
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Old 02-05-2013, 01:47 PM   #14 (permalink)
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Quote:
Originally Posted by plasticuser View Post
3. DFCO is a poor version of what you can do far better with EOC or coasting in idle.
Yes, in the hands of a hypermiler, EOC or coasting in neutral can give better results.
An automated DFCO, however, is one of those "invisible" fuel saving strategies that the average driver can benefit from, without having to do anything.

A more difficult project, but one with greater potential benefits, would be an automated "stop / start" system for older cars.
I don't know if this would be any more one-size-fits-all than the DFCO, however. The number of required input signals to such a system could make it messy to implement.
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Old 02-05-2013, 01:50 PM   #15 (permalink)
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I think that's the point. People who care enough to install the system also care enough to do better than this system. People who passively save gas but don't give a crap wouldn't install a DFCO system

A stop/start system would be good. However, I think that is within the realm of an extra input/output and a few dozen lines of code on any MPGuino type of device.

From this point if we turn the thread over to general discussion of that notion and see if it has legs, it can get its own thread.
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Old 02-07-2013, 05:17 AM   #16 (permalink)
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Yea, i was thinking about this too. But then i too thought that why i don't just improve my EOC system?

It would be like:

Monitor speed signal and clutch.
If speed is above 40km/h AND clutch is depressed, do EOC.
But then it would additionally need some thing that if clutch is depressed, say 2 seconds, then it does the EOC.

All it would need is a signal from MPGuino, some easy frequency based switch and an sensor/switch for cluth, and maybe 555 chip as timer.
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Old 02-07-2013, 10:57 AM   #17 (permalink)
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It could simply show an asterisk or something to let you know conditions are ideal, to retrain the driver. Enforcing it isn't necessary or even desirable.

It doesn't know about snow, for example.

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