Ignition control apparatus for internal combustion engine
US7095182B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2004 |
| Grant date | Aug 22, 2006 |
| Priority date | — |
| Expiry date | Feb 4, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/2075
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An ignition control apparatus for an internal combustion engine of the present invention has a switching circuit and a control circuit. The switching circuit includes a first switch controlling a main current constituting the most portion of the coil current, a second switch controlling a sensing current constituting the coil current together with the main current; and a temperature sensor detecting temperatures of the first and the second switches, which are realized by semiconductors. The control circuit, which is heat-isolated from the switching circuit, includes a current limiting circuit operating the first switch and the second switch to adjust the coil current to a predetermined value based on the sensing current, and a thermal shutoff circuit turning off both the first switch and the second switch when the temperature detected by the temperature sensor exceeds a predetermined threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.