Negative Valve Overlap: A Key to Controlling Lean, Gasoline Auto-Ignition?
By Richard Steeper The drive for cleaner, more efficient engines has pushed research toward low-temperature gasoline combustion (LTGC) strategies that offer hope of achieving mandates for ultra-low engine-out emissions. Such strategies typically exploit auto-ignition to avoid the high-temperature flames associated with spark ignition. However, this approach makes LTGC control a difficult challenge, especially during part-load…