TPMS display
04-16-2004, 09:46 PM
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TPMS display
If there a display avaiable that will read the TPMS sensors and display the actual pressure.
I have seen new systems, but I just want read the data from the existing sensors.
I have seen new systems, but I just want read the data from the existing sensors.
04-19-2004, 04:06 PM
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Originally posted by zoomalot
I don't think the TPS that come with the 8 measure or transmit actual pressure values.
I don't think the TPS that come with the 8 measure or transmit actual pressure values.
04-20-2004, 03:41 PM
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I would imagine that they do "measure" the pressure in some form or fashion... They almost have to. I may be using the word "measure" loosely, but the way I see it, there are three ways the TPMS could work:
1. Actual P transducer in the wheel, transmits a value back to the ECU where it determines if it needs to light the idiot light. I would hope this is the case, but if I were building a car with cost in mind, I'd go with...
2. The unit in the wheel simply 'detects' whether or not the pressure inside the wheel is outside of the range, and if so, transmits back to the ECU, where the ECU lights the idiot light once it recieves a signal from one of the wheels. This saves money in complexity, and power required by the wheel unit to operate.
3. The wheel units are accelerometers that are compared against eachother. When one spins faster than the other, the tire is low, etc. This to me seems by far and away the least likely (it's similar to how the TPMS on my uncle's Buick Regal works, except it doesn't use 4 accelerometers, it measures axle speed)
I may go through the manual and see what I can find out, but I'm sure someone could monitor it empiracally on their own car if they could monitor the RF output by the TPMS.
1. Actual P transducer in the wheel, transmits a value back to the ECU where it determines if it needs to light the idiot light. I would hope this is the case, but if I were building a car with cost in mind, I'd go with...
2. The unit in the wheel simply 'detects' whether or not the pressure inside the wheel is outside of the range, and if so, transmits back to the ECU, where the ECU lights the idiot light once it recieves a signal from one of the wheels. This saves money in complexity, and power required by the wheel unit to operate.
3. The wheel units are accelerometers that are compared against eachother. When one spins faster than the other, the tire is low, etc. This to me seems by far and away the least likely (it's similar to how the TPMS on my uncle's Buick Regal works, except it doesn't use 4 accelerometers, it measures axle speed)
I may go through the manual and see what I can find out, but I'm sure someone could monitor it empiracally on their own car if they could monitor the RF output by the TPMS.
04-20-2004, 09:20 PM
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I have seen after market systems that use the same "looking" valve stem transmitters. and then have a display utit that show pressure of each wheel. The guy at bthe tire store told me that the Metal valve stems we have are the TPMS transmitters. BUt I do'nt know if they transmit a good/bad or an actual pressure. I would think actual pressure as then they would be universal and the reciver could decide good or bad based on manufactures input for the tire pressure. Otherwise the tramsmitters would be different for each tire pressure.
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