Minimal Best MPG Throttle Display
I was thinking about how to display the throttle position for optimal fuel economy in the simplest, most compact manner. That way your mounting options could be enlarged, maybe allowing locations where you don't need to take your eyes off the road. Anyhow, what I came up with was to use a 10 segment LED bar graph that is dual color (red & green). Of course you could use a different number of segments. If you are going too slow, it displays a green bar, starting with your current throttle position and ending at the optimal one. If you're going too fast, it displays a red bar, again starting at your current position and ending at the best one. I guess you could pulse back and forth fast (or just use a tricolor LED display) for when you're on target. Have to test it. You'd just ignore the indicator when other factors (like highway minimum speed limits) contradicted it. It would still give you the direction to aim for when possible. Cutesy stuff like having it "walk" the led from current position to goal would just be annoying I suspect. I know the concept's darned easy, but I drew up a picture and it gave me an excuse to try out Photobucket. Anyone have any thoughts on improvement/problems? Thanks.
https://www.fuelly.com/attachments/fo...19d0cdb5fa.jpg |
Best throttle position for acceleration is the lowest amount that gives you the lowest possible vacuum reading without delaying your transmission shift points (automatic).
If manual, its about 70% throttle from 1500 to 2500 RPM as a general rule. regards gary |
What data do you intend to use? You mentioned throttle position and speed.
Based on wanting to keep centered on a target and avoiding either extreme, I would say to use a pattern like this: IIIIIIIIII |
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I thought that the size of the LEDs that were showing might serve that same function (longer line means further off). It also wouldn't necessarily have to be scaled exactly to the actual throttle range, although that might get confusing. Maybe it could give more resolution in the areas you tend to drive in and less further up (much like telephone A/D converters...think that's called "companding" if my memory serves me). |
I was talking about centering because of this:
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I'm just unclear how you know whether to speed up or slow down. Is it that the green bit should always be centered on the display? Sorry if I'm being dense.
I was just following the stoplight color paradigm: green means "go" (speed up) and red means "stop" (slow down). |
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I've checked out some of the projects out there (a while ago, now). I have a little bit of microcontroller experience, although I've never read OBDII. Like I said, just brainstorming at this point. Display design is very intriguing as people can have very different ideas of what's intuitive.
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I'm not sure it's all that necessary to provide a gauge for optimal speed, though...a willing driver can do a much better job of choosing speed than the bar graph, and an unwilling driver won't obey it anyway. |
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