Method for closed-loop control of injection timing in combustion engines
US6032650A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1998 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Nov 12, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for closed-loop control of the positioning of a predetermined fuel amount in the working cycle of a combustion engine of the Otto-type, in which a predetermined amount of fuel is supplied to the combustion chamber via an injector and the ignition of the air-fuel mixture is initiated after the fuel has been supplied by using a spark plug arranged in the combustion chamber. With a biased measuring gap arranged in the combustion chamber, a measuring voltage U.sub.ION is obtained which corresponds to the degree of ionization during the flame ionization phase. A parameter, dU.sub.ION /dt, characteristic for the basic frequency in the measuring voltage during the flame ionization phase is detected, which parameter could be used in order to indicate if an initiated correction of the injection timing is correct, that is, if the basic frequency increases, the timing is correct and is incorrect if the basic frequency decreases. Preferably, the basic frequency is detected by derivation of the measuring voltage during the period A, B, C, or D, said derivation initiated by reference to time t or crankshaft angle VC, i.e., dU.sub.ION /dt or dU.sub.ION /dVC, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.