Patent ID: 8985089
Filing Date: 2015-03-24
Classification: F02B,F02D,Y02T

Abstract:
1. A method of operating a dual fuel engine, utilizing diesel fuel as a combustion-initiating fuel, and methanol as a complement fuel, at high engine loads with low emissions, comprising: supplying the combustion chamber with a mixture of methanol and charge air at least at high engine loads, wherein the charge-air has an oxygen concentration below 15% to help event initiation of combustion before direct cylinder injection of the diesel fuel; and direct injecting a quantity of diesel fuel into a combustion chamber of the engine to initiate combustion at a desired time near the end of the compression stroke or the beginning of the expansion stroke, wherein the quantity of methanol supplied to the combustion chamber exceeds the quantity of diesel fuel injected into the combustion chamber for engine loads of 8 bar BMEP or higher.