ADJUSTED IGNITION TIMING FOR ENGINE RESTARTING

The present disclosure provides'adjusted ignition timing for engine restart '. Methods and systems are provided for restarting an engine after an engine idle-stop. In one example, a method may include adjusting spark ignition timing based on an estimate of a fuel-to-air equivalence ratio (phi) and an estimate of cylinder turbulence prior to an engine restart after an idle-stop. Optimal spark ignition timing based on estimated Phi and cylinder turbulence during engine restart may result in stable combustion and torque output sufficient to at least partially mitigate the demand for the starting device. 本公开提供了"用于发动机重新起动的经调整的点火正时"。提供了用于在发动机怠速-停止之后重新起动发动机的方法和系统。在一个示例中，一种方法可以包括：在怠速-停止之后的发动机重新起动之前，基于燃料空气当量比(Φ)的估计和气缸湍流的估计来调整火花点火正时。基于发动机重新起动期间估计的Φ和气缸湍流的最佳火花点火正时可以引起稳定的燃烧和足以至少部分地减轻对起动装置的需求的扭矩输出。