Two-wire interface to automobile horn relay circuit
US5789827A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Oct 9, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Q5/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system selectively completes a horn circuit through which electrical power is provided to a horn in an automobile. A relay is connected to a power supply and completes the horn circuit when a current signal passing through the relay has at least a threshold magnitude. A relay driver is selectively activated by processing circuitry. When it is activated, the relay driver is in a conductive state, and when it is not activated, the relay driver is in a high impendance state. When the relay driver is in the conductive state, it places the relay in series with a low potential conductor thereby establishing the current signal at at least the threshold magnitude. The processing circuitry is electrically connected to a manually actuated sensor, which may be a flexible potentiometer. The processing circuitry activates the relay driver when the manually actuated sensor is actuated. The processing circuitry receives electrical power from the relay when the relay driver is in the high impendance state, but receives essentially no electrical power from the relay when the relay driver is in the conductive state. While the processing circuitry receives essentially no electrical power from the r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.