Patent ID: 9708965
Date: 2017-07-18
CPC Classifications: F02B,F02D,F02M,Y02T

Claim:
1. A fuel management system for spark ignition engine where the fuel management system controls fueling from a first fueling system that directly injects fuel into at least one cylinder as a liquid and increases knock suppression by evaporative cooling and from a second fueling system that injects fuel into a region outside of the cylinder; and where there is a range of torque where both fueling systems are used at the same value of manifold pressure; and where a fraction of fuel in the cylinder that is introduced by the first fueling system increases with increasing manifold pressure so as to prevent knock by providing increased knock resistance; and where the fuel management system controls the change in the fraction of fuel introduced by the first fueling system using closed loop control that utilizes a sensor that detects knock and where open loop control is also used; and where the open loop control uses an engine map lookup table; and where open loop control is used during transients in engine load.