Method of implementing control logic of compression-ignition engine
US10767577B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2019 |
| Grant date | Sep 8, 2020 |
| Priority date | — |
| Expiry date | May 13, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of implementing control logic of a compression-ignition engine is provided. A controller outputs a signal to a injector and a variable valve operating mechanism so that a gas-fuel ratio (G/F) becomes leaner than a stoichiometric air fuel ratio, and an air-fuel ratio (A/F) becomes equal to or richer than the stoichiometric air fuel ratio, and to an ignition plug so that unburnt mixture gas combusts by self-ignition after the ignition plug ignites mixture gas inside a combustion chamber. The method includes steps of determining a geometric compression ratio and determining the control logic defining an intake valve close timing IVC. IVC (deg.aBDC) is determined so that the following expression is satisfied: if the geometric compression ratio ε is 10≤ε<17, 0.4234ε2−22.926ε+207.84+C≤IVC≤−0.4234ε2+22.926ε−167.84+C where C is a correction term according to an engine speed NE (rpm), C=3.3×10−10NE3−1.0×10−6NE2+7.0×10−4NE.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.