Electrostatic seat occupant detection system
US8078362B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2008 |
| Grant date | Dec 13, 2011 |
| Priority date | — |
| Expiry date | Jan 29, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R21/01532
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electrostatic seat occupant detecting system of a vehicle has a vehicle body and a seat. The electrostatic seat occupant detecting system includes an antenna unit that includes a main electrode and a sub-electrode disposed near the main electrode, an AC power source, a switch unit for switching supply of AC voltage to the antenna unit to form one of a first electric field between the vehicle body and the main electrode thereby providing a seat-occupant detecting mode and a second electric field between the main electrode and the sub-electrode thereby providing a wet condition detecting mode, and a seat-occupant detecting ECU. The above seat-occupant detecting ECU includes an admittance calculating section that calculates a first admittance of the first electric field and a second admittance of the second electric field, a conductance susceptance separating section that separates conductance of the first and second admittance from the susceptance of the first and second admittances, a water content estimating section that estimates an amount of water content of the seat based on the conductance and the susceptance of the second admittance, and a judging section that judges whethe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.