The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 15, 2020
Filed:
Feb. 07, 2018
Volkswagen Ag, Wolfsburg, DE;
Jens Wodausch, Braunschweig, DE;
Florian Zink, Gifhorn, DE;
VOLKSWAGEN AKTIENGESELLSCHAFT, Wolfsburg, DE;
Abstract
A method for operating an internal combustion engine which has a number of cylinders and which comprises a fuel system and a fresh air system, whereby fuel is fed in a fuel mass flow via a fuel supply line of the fuel system to the cylinders at a prescribable air-fuel ratio directly by means of the injectors, and fresh air is fed in a fresh air mass flow via a fresh air system, whereby the fuel system comprises a tank venting system with a tank venting line that has a tank venting valve and that, via the interconnected tank venting valve, is connected to at least one line section of the fresh air system via at least one feed point, thereby forming at least one venting path, whereby, owing to a pressure which prevails at the at least one feed point and which is negative relative to the tank venting line and dependent on the load point, the fuel tank of the tank venting system is vented via the at least one venting path, a venting process in which a purging air mass flow containing fuel is removed from the tank venting system and fed to the cylinders as a portion of the fresh air mass flow, so that a total fuel mass flow is fed into the cylinders directly by means of the injectors of the fuel system as well as indirectly via the fresh air mass flow. It is provided that the direct feed of fuel by means of the injector of at least one of the cylinders is blocked, as a result of which a purging air mass flow comprising the fuel volume equivalent that is now absent due to the blocking of the at least one cylinder can advantageously be removed from the tank venting line, while maintaining the prescribed air-fuel ratio via the at least one venting path at the at least one feed point, and this purging air mass flow can be fed as a portion of the fresh air mass flow to the cylinder(s) that is/are still being supplied with fuel.