Measuring Exhaust Gas Energy Without Sensor Inside The Pipe

Wow...

If I felt compelled to conduct such a survey, I think I would

1) Discover efficiency of the ICE
2) Discover fuel consumption rate
3) Do the maths

The temp of the exhaust... an undefined distance from the source, transferred thru a pipe of unknown dimensions, operating in an unknown ambient temperature, with some unknown heat radiation rate thrown in for good measure... what will that number mean?

A Hall effect sensor measures magnetic fields. So unless your hall effect sensors measure the wheel rotation rate from a magnet spinning on a wheel, you will not know anything about velocity. You will also have to take the derivative of your Hall effect reading to obtain any data that remotely correlates to vehicle velocity. You also assume an awful lot of uncertain information for the basis of any kind of calculation. The outside surface temperature of your exhaust pipes will not correlate fast enough with the inside gas temperature if the correlate at all. The outside surface temperature will change with ambient air temperature along with air flow from movement turbulence and convection. Not to mention the thermal conductivity time constant of the pipe material.

......not to mention fuel quality consistancy

What folly!

All you are going to measure is the temperture on the outside of your exhaust system.

It will be up to you to do the conversions with the correct assumptions on all the other missing parts.

But why on Earth would you like to do this?

"I have just one temperature sensor OUTSIDE the exhaust pipe"

Is it:

1. OUTSIDE the exhaust pipe under the hood?

2. OUTSIDE the exhaust pipe under the car?

3. OUTSIDE the exhaust pipe behind the car? 1 inch away? 5 inches away? Is the wind blowing? How will this sensor work at 60 MPH?

4. OUTSIDE the exhaust pipe down the street?

5. OUTSIDE the exhaust pipe in the next city?

You see where this is going, don't you?

Nowhere!

Your point 5. Sounds about feasible to me. Its the same way we determine global warming. I would put the sensor there if I was OP!

That's okay. The moderators can delete this thread.

I don't think that is going to happen. It will be a fine example of the things that are getting posted in the internet without the option to back off again.

With speech it is: think before you talk, with the internet it is think twice before you type.