LPP combustion control for IC engine with abnormal combustion
US4596218A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1985 |
| Grant date | Jun 24, 1986 |
| Priority date | — |
| Expiry date | Jul 31, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An LPP ignition timing control for an internal combustion engine of the type having a normal combustion mode characterized by combustion pressure peaks compatible with closed loop LPP ignition timing control and an abnormal combustion mode which may not be so compatible includes a closed loop control apparatus effective to sense LPP in the combustion chamber, generate an LPP value therefrom, store a DLPP value indicative of a desired LPP, and compare the LPP value and stored DLPP value and adjust ignition timing to reduce the difference therebetween. During a sensed abnormal combustion mode, the control changes the ignition timings for ignition events toward predetermined, stored ignition timings and substitutes for the stored DLPP value temporary DLPP values which are a predetermined crankshaft angle in advance of the generated LPP values and limited in the retard direction to the stored DLPP value. After the termination of the abnormal combustion mode the control continues the substitution of the temporary DLPP values for the stored values until the former comes within a predetermined crankshaft angle of the latter. The abnormal combustion mode may be sensed as excessive variatio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.