Dimethyl ether (DME) enhanced gasoline engine

a technology of dme and gasoline engine, which is applied in the direction of machines/engines, mechanical equipment, electric control, etc., can solve the problems of limiting efficiency, misfire and knock, and the uncontrollable auto-ignition of unburned air-fuel mixture, so as to minimize the possibility of misfire in the engine map and minimize the use of dme
US20110100323A1Inactive Publication Date: 2011-05-05ETHANOL BOOSTING SYST LLC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
ETHANOL BOOSTING SYST LLC
Publication Date
2011-05-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

An engine having DME pilot ignition is disclosed. DME Pilot ignition creates far more energy than a conventional spark plug, thus minimizes the possibility of misfire in the engine map. DME injection can be used in a number of ways. In one embodiment, DME injection replaces the conventional spark plug in an Otto cycle engine. In another embodiment, DME injection is used in addition to spark ignition to minimize the use of DME. In this embodiment, DME injection is only used during those portions of the engine map where misfire may occur, or during those times when a misfire sensor detects misfire. DME injection can also be used in conjunction with alcohol boosting in other embodiments.
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Description

[0001] This application claims priority of U.S. Provisional Application Ser. No. 61 / 169,841, filed Apr. 16, 2009, the disclosure of which is incorporated herein by reference in its entirety.BACKGROUND

[0002] Spark ignited engines face multiple constraints in operation that limit their efficiency. Two such limitations are misfire and knock. Misfire is the phenomenon whereby the gasoline-air mixture does not ignite in the presence of a spark. Knock is the uncontrolled auto-ignition of the unburned air-fuel mixture during the combustion process.

[0003] Lean operation, which is defined as operation in which there is an excess amount of air for the amount of fuel introduced, has been known to increase the efficiency of an engine through the reduction of frictional losses, as well as decreased heat losses to the cylinder wall due to lower combustion temperatures. The NOx emissions decrease when excess amounts of air are used, and it is possible to decrease NOx emissions to the point where ther...

Claims

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