Valve having means for generating a wireless transmittable indicating signal in case of a pressure drop within vehicle tires
US5774048A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1994 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Dec 19, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C23/0494
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A valve which includes signal generating means generate a signal representing a pressure drop within a vehicle tire. The valve includes an absolute pressure sensor coupled to measure the pressure within the tire. A microprocessor is provided which upon activation following operation of the valve stores a value of the electric pressure signal from the pressure sensor in a memory. During operation of the vehicle, the stored reference electric pressure signal is compared with periodic measurements of pressure within the tire. The transmitter is activated at periodic intervals, whenever a given ratio between the compared values and a threshold value exceeds an upper or lower limit. The system is activated by a acceleration sensor which can detect when the vehicle is moving, thus avoiding power consumption stopped.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.