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  #1 (permalink)  
Old 03-30-2006, 04:10 PM
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Hybrids: Honda Civic Hybrid II
Posts: 19
Default What is the 62 mile bug?

Saw some posts in regard to this, but haven't been able to google any info on it. Can anyone fill me in?

Thanks,

BP
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Old 03-30-2006, 04:23 PM
Ridiculously Active Enthusiast
 
Real Name: Elan
Location: El Cerrito, CA
Hybrids: 2006 HCH Alabaster Silver w/Navi
Posts: 700
Default Re: What is the 62 mile bug?

Quote:
Originally Posted by BigPanda
Saw some posts in regard to this, but haven't been able to google any info on it. Can anyone fill me in?

Thanks,

BP
The HCH2 has two trip odometers. It tracks average MPG for each of those odometers, i.e. for the distance you've traveled since the last time you reset the trip odometer. Many people use this, for example, to track their MPG per gas tank.

Many of the HCHs have a bug where the MPG calculation is reset every 62 miles or so, even when the trip odometer itself is not reset. So we cannot correctly track lifetime MPG, or MPG for a tank of gas, or MPG for any trip that is longer than 62 miles.

.

2006 HCH Alabaster Silver w/Navi
2003 Honda Accord LX
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Old 03-30-2006, 04:47 PM
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Hybrids: Honda Civic Hybrid II
Posts: 19
Default Re: What is the 62 mile bug?

Thanks Elan,

Glad that I don't seem to have this problem.

BP
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Old 03-30-2006, 05:03 PM
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Real Name: Don
Hybrids: 06 HCH, 06 Highlander Hybrid, 99 Dodge Ram 2500 Diesel
Posts: 227
Default Re: What is the 62 mile bug?

Interestingly, 62.14 miles is 100 kilometers.
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Old 03-30-2006, 06:07 PM
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Real Name: Bill
Hybrids: 2006 Honda Civic Hybrid (II)
Posts: 328
Default Re: What is the 62 mile bug?

Quote:
Originally Posted by dshelman
Interestingly, 62.14 miles is 100 kilometers.
Yeah, I've seen that posted before, but I really don't think that's it. Last weekend I was on the highway and I watched it really closely. I was going about 60 mph, and the display updates every 10 seconds, so I was going about 1/6 mile between updates. It definitely did not change until just after 63 miles by my observation. Anyone seen something different?

Last edited by toast64; 03-31-2006 at 01:14 AM.
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Old 03-30-2006, 07:55 PM
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Real Name: Elan
Location: El Cerrito, CA
Hybrids: 2006 HCH Alabaster Silver w/Navi
Posts: 700
Default Re: What is the 62 mile bug?

Quote:
Originally Posted by toast64
Yeah, I've seen that posted before, but I really don't think that's it. Last weekend I was on the highway and I watched it really closely. I was going about 60 mph, and the display updates every 10 seconds, so I was going about 1/10 mile between updates. It definitely did not change until just after 63 miles by my observation. Anyone seen something different?
Well, any time you reset the trip odo manually you'll see that it takes a little while for the MPG number to show up. I think that when starting from zero miles it wants to accumulate some data before showing you a number. The same may happen after the bug resets the MPG calculation, which is why there is a delay.

.

2006 HCH Alabaster Silver w/Navi
2003 Honda Accord LX
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Old 03-31-2006, 01:16 AM
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Real Name: Bill
Hybrids: 2006 Honda Civic Hybrid (II)
Posts: 328
Default Re: What is the 62 mile bug?

Quote:
Originally Posted by ElanC
Well, any time you reset the trip odo manually you'll see that it takes a little while for the MPG number to show up. I think that when starting from zero miles it wants to accumulate some data before showing you a number. The same may happen after the bug resets the MPG calculation, which is why there is a delay.
Makes sense. I think I have a way to test this once and for all. I hope to try it tonight. More to come....
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Old 04-04-2006, 09:57 AM
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Tim Tim is offline
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Real Name: Paul
Location: Seattle, Washington
Hybrids: 03 HCH CVT (retired)
Posts: 852
Default Re: What is the 62 mile bug?

Don't know how much this has to do with it, but computers think/speak in binary - 1's and 0's. You can count from 0 to 63 using 6 bits, that is 000000 thru 111111. To get 64, you need a seventh bit (1000000). Often times when computers do goofy things related to math, it happens on the factors of 2 (1, 2, 4, 8, 16, 32, 64...). If the computer - due to a programming error - is only reading the first 6 bits of the mileage data, it would go 0 - 63 then recycle. It could be some other combination as I'm not sure how they'd handle the decimal.

.


*** Retired after 65,000 outstanding miles ***
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Old 04-04-2006, 10:51 AM
Ridiculously Active Enthusiast
 
Real Name: Elan
Location: El Cerrito, CA
Hybrids: 2006 HCH Alabaster Silver w/Navi
Posts: 700
Default Re: What is the 62 mile bug?

Quote:
Originally Posted by Tim
Don't know how much this has to do with it, but computers think/speak in binary - 1's and 0's. You can count from 0 to 63 using 6 bits, that is 000000 thru 111111. To get 64, you need a seventh bit (1000000). Often times when computers do goofy things related to math, it happens on the factors of 2 (1, 2, 4, 8, 16, 32, 64...). If the computer - due to a programming error - is only reading the first 6 bits of the mileage data, it would go 0 - 63 then recycle. It could be some other combination as I'm not sure how they'd handle the decimal.
Unlikely because the trip mileage is tracked in tenths of a mile, and the reset definitely happens between 62 and 63 miles.

.

2006 HCH Alabaster Silver w/Navi
2003 Honda Accord LX
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Old 04-04-2006, 10:55 AM
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Posts: 57
Default Re: What is the 62 mile bug?

Quote:
Originally Posted by Tim
Don't know how much this has to do with it, but computers think/speak in binary - 1's and 0's. You can count from 0 to 63 using 6 bits, that is 000000 thru 111111. To get 64, you need a seventh bit (1000000). Often times when computers do goofy things related to math, it happens on the factors of 2 (1, 2, 4, 8, 16, 32, 64...). If the computer - due to a programming error - is only reading the first 6 bits of the mileage data, it would go 0 - 63 then recycle. It could be some other combination as I'm not sure how they'd handle the decimal.
You're on the right track here. Back when I was a Real Engineer, I used BCD - binary coded decimal - dedicate 4 bits for each digit.. 0001 0001 would be 11.

But I don't think BCD's are used anymore, rather it is all done in software. So I would guess, cars with this bug has stuck at bit (or faulty overflow operation). Since only some of the cars have this, I would hazard to guess some hardware fault (bad RAM/Flash).
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Old 04-04-2006, 10:55 AM
 
 
 
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