Electronic ignition timing
US4444171A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1982 |
| Grant date | Apr 24, 1984 |
| Priority date | — |
| Expiry date | Nov 10, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A motorcycle two cylinder asymmetric ignition timing system includes an electronic ignition advance circuit. A spark advance control signal is derived from a base signal which in turn has a magnitude that is representative of the time duration between spark ignition signals and thus is representative of engine speed. The spark is not advanced at engine speeds up to 300 RPM, is advanced 9.degree. between 300 RPM and 800 RPM and is advanced 16.degree. above 800 RPM. Intersection between a ramp signal which has a duration that is an inverse function of engine speed and a base signal that has an amplitude which is an inverse function of engine speed determines the time at which the ignition signal is generated. The lower the base signal, the sooner the intersection of the ramp with the base signal and thus the earlier the ignition signal. In this fashion the desired advance is attained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.