Active signal-generating spacer-fabric-type continuous touch/pressure sensor

Attention toward automated driving has recently increased. This has also increased the need to monitor drivers' actions, such as finger touch/pressure sensing on the steering wheel. This study demonstrates an active signal-generating spacer-fabric-type continuous touch/pressure sensor comprising five yarn layers: surface-insulating cotton, upper conductive, monofilament spacer, lower conductive and bottom-insulating cotton yarn. The sensor actively generates signals, and the magnitude of the voltage output through a diode bridge and capacitor circuit determines if the fingers are 'not touching', 'touching', 'pushing' or 'pushing hard'. This demonstrates that the proposed sensor can be operated as an active signal-generating touch/pressure sensor and can also detect 'pushing hard' actions. Furthermore, the active signal-generating operation originates from the electromagnetic waves emitted by electrical appliances and cables powered by a commercial power supply frequency in the environment. The proposed sensor will contribute to developing high-cushioning touch/pressure sensors with low power consumption and excellent air permeability that can be used in electric and autonomous vehicles.

Automated summary

Attention toward automated driving has increased recently. This study presents an active signal-generating touch/pressure sensor that can detect different actions on the steering wheel. The sensor utilizes electromagnetic waves emitted by electrical appliances and cables to operate and can be used in electric and autonomous vehicles.