Methods for reducing raw particulate engine emissions

US9488093B2 · kind B2 · utility

Assignee

• Ford Global Technologies, LLC · US

Inventors

• Helmut Hans Ruhland · Eschweiler, DE
• Georg Louven · Neuwied, DE

Key dates

• Filing date: Jan 9, 2014
• Grant date: Nov 8, 2016
• Expiry date: Nov 18, 2034

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2200/0602
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The methods described allow for reducing particulate emissions from a direction injection engine during a starting phase, while also maintaining the engine start phase within a predetermined threshold. In one particular example, the methods comprise adjusting at least one of a fuel release pressure threshold and enrichment factor based on an engine condition; activating a starting device to rotate a crankshaft coupled to an engine cylinder without injecting any fuel; supplying fuel to the cylinder based on the enrichment factor only when a fuel pressure exceeds the fuel release pressure threshold; and stratifying a cylinder charge while adjusting a fuel injection within a compression phase and/or expansion phase of the engine. In this way, an amount of fuel injected may be evaporated in the combustion chamber while preventing a combustion wall wetting, which allows for reduced particulate emissions, particularly at reduced temperatures.