Electronic ignition system with modulated cylinder-to-cylinder timing
US5626117A · kind A · utility
71Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1994 |
| Grant date | May 6, 1997 |
| Priority date | — |
| Expiry date | Jul 8, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An electronic ignition timing control system including a mechanism for retarding the ignition timing for all or a predetermined subset of the cylinders in a multi-cylinder internal combustion engine during cold starts. Spark timing is reduced for a balanced subset of the cylinders for a short time after the engine is started in order to transfer additional heat to the exhaust system to more quickly raise the temperature of the catalyst and thereby reduce undesired emissions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.