mileage -to -hours

[TonyB55]

Is there a published standard to convert mileage of vehicle life in automotive design to an "on time" hours of use for the electrical devices? I have "heard" of using and average vehicle speed of 30mph to first determine an appropriate operational/durability life, e.g., 150,000 miles becomes 5000 hurs of operation. Thanks.

 

[sciguyjim]

I was thinking about this too, but I think the problem is all the variability in driving patterns/habits, etc. to allow for decent accuracy. What I was going to do is take a stopwatch with me for several days of "typical" driving. I'd note the total number of miles driven each day, and the total time the car was running as totaled by the stopwatch. That would give me a miles to hours conversion specifically for me and my driving style on my typical roads, etc. I'd expect big differences between summer and winter.

 

[c2s]

If you wanted a standardized basis, use the EPA driving cycle.
Kevin

 

[GregLocock]

It obviously depends on vehicle type, customer and environment, but you will not go far wrong in Australia if you assume 50 kph as an 'average' speed, time basis (srictly it was the modal speed>10 kph). I have reviewed data from 30 cars logged over 3-6 months to get that figure, it is pretty solid. Vehicle speeds in the USA are about the same. Beware of time at idle, it can be anything up to 50% of the life of a taxi.





Cheers

Greg Locock

 

[Rob45]

I've got an on-board computer that among other things continuously computes average speed.

When I haven't reset it, over long periods of time and without including long trips, it usually shows right around 36 mph, not far from the 50 kph Greg noted.

 

[GregLocock]

I should add that all those cars were city cars, which is valid for Oz since >>90% of new car buyers live in cities.

If we included country cars as well the avergae speed would be a bit higher, my commute car shows 67 kph as a long term average, my commute includes several sections of unpoliced (ahem) country roads.

Cheers

Greg Locock