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A New Purging Way for Carbon Canister in Charged Engines

IP.com Disclosure Number: IPCOM000246226D
Publication Date: 2016-May-18
Document File: 3 page(s) / 243K

Publishing Venue

The IP.com Prior Art Database

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Page 01 of 3

A New Purging Way for Carbon Canister in Charged Engines

In Gasoline Turbocharged Direct Injection ("GTDI") engines, due to the high pressure of the air intake manifold, it is difficult to push the air toward the air intake manifold passing through the canister. To resolve this problem, previous solutions either use an electric pump to push the air into the manifold or use a venturi to generate a vacuum and suck the air through the canister toward a path upstream of the compressor. Both solutions are quite expensive, and also some external air would be injected into the manifold, potentially changing change the Fuel-Air -Ratio of the engine. This external air will degrade engine efficiency.

Our new method uses pressure built by the compressor to pass some of the flow toward the intake manifold through the canister. This route is parallel to the intake manifold and may open when necessary using a 3-way valve. The route does not require any additional parts to create pressure, as will be discussed in detail in the following paragraphs.

Method

The schematic of the new method is shown in the following pictures.

New Approach Schematics


Page 02 of 3

New Approach Pressure Diagram

The driving force for the purging flow is the pressure difference and the air is from the Air Intake System ("AIS") (no external air). The air may be branched from before or after the Charge Air Cooler ("CAC") depending on system restriction. The 3-way valve connects the canister to ambient and upstream of AIS in normal working and purging conditions respectively. The mentioned approach definitely works when there is enough boost pressure.

In case of no boost/vacuum condition this pressure difference still exists and can push the flow through the canister to the intake manifold.

A second situation is managed when there is no boost. In this instance, the 3-way valve opens and the vacuum will suck the ambient air through the canister toward the intake manifold. Both situations...