Patent ID: 7762233
Filing Date: 2010-07-27
Classification: F02B,F02D,F02M,F02P,Y02T

Abstract:
1. A spark ignition engine system for which fuel is introduced into the engine from a first source and a liquid is separately introduced into the engine from a second source by direct injection comprising: a spark ignition engine; a first means for introducing the fuel from the first source into the engine; a second means for direct injection of the liquid from the second source into the engine, wherein during part of the engine operating time, the engine receives both the fuel from the first source and the liquid that is directly injected from the second source; and a fuel management system which varies the relative amount of the liquid from the second source that is introduced into the engine so as to prevent knock, wherein the fuel management system employs information from a knock detector and uses closed loop control to control the amount of directly injected liquid from the second source; and wherein the engine is operated with a substantially stoichiometric fuel/air ratio.