Electronics > Projects, Designs, and Technical Stuff
Best sensor scheme for hot brakes?
Conrad Hoffman:
May or may not build something but the last couple cars I've had tend to develop dragging brakes after a while. Probably doesn't help that I park on a dirt/stone driveway and live in a northern climate. My guess is there're a lot of people not getting the best mileage due to dragging brakes, maybe more than from low tire pressure before tire pressure sensors. My Hyundai drops from about 38 to 35 when I know I have a problem. Less than that if it's a smokin' hot problem. Anyway, I've considered thermocouples mounted on the calipers, thermistors and diodes, all requiring wiring back to a box in the passenger compartment. I'd like an IR solution pointed right at the rotors, but that probably won't be cheap or easy. Curious what the hive mind can come up with. Any cheap wireless solutions? Something that can be monitored on the phone? If the automakers did it, how do you think they might go about it? Also, anybody else suffer from this?
Rerouter:
Thermocouple is still the best, but I would do it like wireless tyre pressure monitors, Those already can report trye temperature, so a dragging brake heats 1 tyre more than the rest, and there is a standard already to make it compatible with many cars. just broadcasting the temperature information.
mikerj:
Non-contact sensing is going to be problematic, the sensor will quickly be obscured with dirt. An OEM would probably do something like integrate temperature sensing with the pad wear sensor, and the ECU would then compare pad temperature against integrated energy from brake use over some time period.
2N3055:
Breaking fluid temp will have at least some correlation with brake system temperature..
Also brake calipers will have raised temp. Those can be contact measured..
There are also pads with already embedded thermocouple sensors...
Conrad Hoffman:
I see some interesting solution for the race people online, IR and thermocouples that you embed in the brake pads. Not practical for a street car though. Right now I'm thinking a sensor bolted to the caliper is the way to go.
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