How does the tire pressure sensor on my car know that the tires are low?
#128637. Asked by RufusDufus. (Dec 28 12 10:34 AM)
"Indirect types work by using an existing vehicle sensor, usually that of the ABS (anti-lock brake) system, to detect low pressures. Unfortunately, indirect Tyre Pressure Monitoring Systems are often not very accurate and require the driver to reset the system every time a tyre is inflated.
"Direct Tyre Pressure Monitors are more common and effective. They consist of a combined tyre pressure sensor and valve unit, attached to the inside of each wheel rim.
"The sensors emit a low-frequency radio signal to a receiver, the message from which is sent to the vehicle's onboard computer. The driver is then alerted if the tyre pressures fall below the prescribed limits."
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