Engine control apparatus
US4898139A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1988 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | Sep 8, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An apparatus for controlling a spark ignited internal combustion engine comprising a control unit including a memory having first and second tables containing the desired relationships between the engine condition and the spark timing for the engine operating on low and high octane fuels. The control unit calculates a value corresponding to a setting of the spark timing repetitively at uniform intervals from the first table in response to a first level of the control signal and from the second table in response to a second level of the control signal and advances the spark timing at a predetermined rate in the presence of the first level of the control signal and changes to the second level when the spark timing is advanced over a first reference value. The control unit retards the spark timing at a second predetermined rate in response to engine knock in the presence of the second level of the control signal and changes the control signal to the first level when the spark timing is retarded over a second reference value. The control unit stores a maximum advance value .beta..sub.max to which the spark timing is advanced before the spark timing is advanced at the first predetermine…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.