Data acquisition

[DJHache]

This is for all you other Data Geeks out there. What do you and what would you measure/monitor on your car if you could.

Keeping in mind that we are limited by sampling frequencies, budgets, and packaging what would your optimal DAQ look like?

At the Claude Rouelle seminar he showed us a lot of nifty tricks with his multi-thousand dollar setup, and while it was cool, it isn't necessarily suitable to an Fcar team.

There's the basic setup with warning lights connected to water temp and oil psi, and there's the ultra bad**s setup with smoothly integrated ECU and DAQ running in closed loops, combined with active suspension and condition monitoring of all the bearings, chain tension which then turns your dash into an F1 steering wheel.

We all fall somewhere in between and I was wondering what other teams are doing.
We have a DAQ that gives us 3axis acceleration and suspension position, and accepts inputs like wheel speed, and our ECU logs lambda and wheel speed for us.

[DJHache]

This is for all you other Data Geeks out there. What do you and what would you measure/monitor on your car if you could.

Keeping in mind that we are limited by sampling frequencies, budgets, and packaging what would your optimal DAQ look like?

At the Claude Rouelle seminar he showed us a lot of nifty tricks with his multi-thousand dollar setup, and while it was cool, it isn't necessarily suitable to an Fcar team.

There's the basic setup with warning lights connected to water temp and oil psi, and there's the ultra bad**s setup with smoothly integrated ECU and DAQ running in closed loops, combined with active suspension and condition monitoring of all the bearings, chain tension which then turns your dash into an F1 steering wheel.

We all fall somewhere in between and I was wondering what other teams are doing.
We have a DAQ that gives us 3axis acceleration and suspension position, and accepts inputs like wheel speed, and our ECU logs lambda and wheel speed for us.

[Mechanicaldan]

We've on of the few teams running an AEM ECM. Besides all the engine features that are controlled and logged, it has lots of spare channels that we are hoping to monitor 4 position sensors on the suspension, an accelerometer, and 4 wheel speed sensors. I'd like to add something to monitor brake pressure, so we could tell how good or bad the driver is.

Anyone know of a reasonably price linear position sensor that can be used for the suspension? We keep finding sensors in the range of $250 each.

Mostly, we are trying to cover the basics, to adjust the car's handling, and train our drivers. We also need to collect data, which has been lacking in the past, to assist with future car design.

Found this DAQ forum if anyone is interested.
http://pub6.ezboard.com/fs2racingfrm4

Cyclone Racing
www.cyclone-racing.com (http://www.cyclone-racing.com)
Iowa State University
Project Director

[B Lewis @ PE Engine Management]

Quality displacement transducers have always been a little on the costly side. Here are a couple of ideas that I have used in the past when on a tight budget:

- Mock up a cheap rotational pot with a large lever arm and use the wiper to measure shock travel. This works well if you have some real estate to mount it and if you don't plan on using the pot for an extended period of time.

- Use a simple strain bridge calibrated for displacement. This works great if you have strain amplifiers handy. Just lay down a bending bridge on a piece of steel shim stock (say 0.020" or so depending on the travel) and then calibrate for displacement. Very cost effective especially since most Universities have strain gages laying around.

Hope this helps. Happy data gathering!!!

Brian Lewis
Performance Electronics, Ltd.
www.pe-ltd.com (http://www.pe-ltd.com)
"Complete Engine Management Systems for $798"

[Mad Ruska]

try www.2d-datarecording.com (http://www.2d-datarecording.com) and talk to bernd kretzer. the help us very much!

Frank

Student Racing Team 99-03

[DJHache]

Hey Daniniowa, I think you should drop one of the undriven wheel speed sensors in favor of a second accelerometer mounted longitudinally. That way you can gather braking info through long acceleration. Plus it helps you define a g-g circle which is a very handy tool for explaining to driver what he is doing wrong or right.

[El Mug]

hey brian, there is a way to find rotational pots that can resist longer that a cheap one. The ones we use have a very short period of life, and we dont want to change those too many, at the end you expend the same amount of money.

Equipo F-SAE USB
http//www.formulasae.grupos.usb.ve/
Caracas, Venezuela

[V2 - Italy]

We have the EVO3 AIM data logger, that have two accelerometers integrated

http://www.aim-sportline.com/

it is cheaper than others and it works fine.

They have linear position sensors and angular too.

Daniele

Firenze Race Team V2
http://www.firenzerace.too.it
DUCATI POWER at the UniversitÃ* di Firenze