Spark plug cap with misfire detecting capacitor for internal combustion engine
US5363046A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1993 |
| Grant date | Nov 8, 1994 |
| Priority date | — |
| Expiry date | Feb 2, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P2017/125
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A spark plug cap having a capacitor for detecting ignition voltage of an internal combustion engine to determine if misfire occurs. The spark plug cap covers the terminal of a spark plug and has a conductor for carrying ignition voltage current from an ignition coil to spark plug terminals to generate an electronic spark between spark plug electrodes and an insulator surrounding the conductor. In the spark plug cap, a second conductor is located around the first conductor keeping a predetermined distance from the first conductor such that a capacitor, which constitutes a capacitance divider with a capacitor for ignition voltage detection, is formed between the first and the second conductors. A ceramic insulator may be positioned between the first and the second conductors to provide higher insulation property.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.