3 ms·
TPMS works by calculating the RPM of the wheel and knowing the tire size and vehicle speed. Most TPMS setups don't know the actual pressure, they infer it.
by emidln 5y ago
TPMS works by calculating the RPM of the wheel and knowing the tire size and vehicle speed. Most TPMS setups don't know the actual pressure, they infer it.
- lastofthemojito 5y agoBoth types of systems exist, but from what I've seen the indirect TPMS systems you're describing are becoming less popular. I'm somewhat familiar with Mazdas anyhow and that's the way it's going with them. For 2017 the Mazda6 used an indirect system: https://www.mazdausa.com/static/manuals/2017/mazda6/contents/05120100.html https://www.mazdausa.com/static/manuals/2017/mazda6/contents... For 2020 it's a direct system with in-tire sensors: https://www.mazdausa.com/static/manuals/2020/mazda6/contents/05120200.html https://www.mazdausa.com/static/manuals/2020/mazda6/contents...
- _moof 5y agoOh, interesting. Well, my car at least has sensors—either that or I paid way too much for valve stems. :)
- tschwimmer 5y agoThis is true of cheaper cars, like my Honda. German cars like Audis and Porsches have direct TPMS that can actually tell you the exact tire pressure.
- matli 5y agoMost Audis have indirect systems, but they have direct TPMS as an optional extra. At least that's the case on the European market, unsure about the US market. Some premium Audis also have loose wheel detection, which is based on a similar technology as the indirect TPMS.