A HAAS screen picture showed that they ran a hot and a cold fuel rail. Would it be possible to mix and inject a specific temp fuel to control the cylinder temperature? Or are the ranges simple out of scale?johnny comelately wrote: ↑11 May 2022, 22:41Below is a summary of a research paper by Robert W. Dibble showing intake temperature being manipulated to achieve (inferred) HCCI in a stationary gas ICE, a huge challenge in my opinion.
In other papers he discusses oil's role in preignition (relevant to F1 previously) and ethanol characteristics in relation to preignition.
The more that research is exposed the more respect for the engine developers in F1, something we take for granted.
Dibble has many relevant and astounding research papers , links at the end.
2009-06-15
Demonstrating Optimum HCCI Combustion with Advanced Control Technology 2009-01-1885
We have converted a Caterpillar 3406 natural gas spark ignited engine to HCCI mode and used it as a test bed for demonstrating advanced control methodologies. Converting the engine required modification of most engine systems: piston geometry, starting, fueling, boosting, and (most importantly) controls. We implemented a thermal management system consisting of a recuperator that transfers heat from exhaust to intake gases and a dual intake manifold that permits precise cylinder-by-cylinder ignition control.
Advanced control methodologies are used for (1) minimizing cylinder-to-cylinder combustion timing differences caused by small variations in temperature or compression ratio; (2) finding the combustion timing that minimizes fuel consumption; and (3) tuning the controller parameters to improve transient response. Tasks 2 and 3 were accomplished with extremum seeking, a non-model- based optimization scheme that may help deliver a practical solution to the challenging problem of HCCI engine control.
http://profiles.sae.org/robert_dibble/
https://www.researchgate.net/profile/Robert-Dibble-3