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Method for operating a drive assembly and drive assembly

A technology for driving equipment and gasoline engines, applied to mechanical equipment, engine components, combustion engines, etc., can solve problems such as power loss, achieve the effects of reducing compression work, reducing knocking tendency, and improving overall thermodynamic efficiency

Active Publication Date: 2018-04-27
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Miller / Atkinson method known in the prior art however has a significant power loss

Method used

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  • Method for operating a drive assembly and drive assembly
  • Method for operating a drive assembly and drive assembly
  • Method for operating a drive assembly and drive assembly

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Embodiment Construction

[0035] In conventional Otto engines, this is limited due to the necessary throttling for constant load control and the reduced compression ratio thermodynamic efficiency to avoid engine knocking. A method for eliminating throttling in part-load operation and for possibly increasing the geometric compression ratio is the so-called Miller or Atkinson method. In this case, air consumption is reduced and effective compression is achieved by earlier or later closing of the inlet valve (earlier intake closing, FES; later intake closing, SES). This dethrottles the engine and reduces the compression end temperature and thus the propensity to knock or increases geometric compression. The air consumption, which specifies the ratio of the actual air volume to the maximum theoretical air volume after the intake stroke, can be reduced by the Miller method from eg 0.95 to 0.5-0.9. Due to the reduced air consumption, however, power losses may occur. In order to avoid this loss of power and...

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Abstract

The present invention relates to a method for operating a drive assembly having a gasoline engine (1) and an exhaust gas cooling system. According to the method, combustion air fed through an inlet valve to a cylinder (3) of the gasoline engine (1) is compressed by an exhaust turbocharger (12) having a turbine (13) with variable turbine geometry. The inlet valve is closed before a piston in the cylinder (3) reaches bottom dead center. The exhaust gas fed to the turbine is cooled in a section of an exhaust gas line, in particular in the exhaust manifold.

Description

[0001] This application is a divisional application of the Chinese patent application CN201280064178.1 with the filing date of December 19, 2012, entitled "Method for Operating Drive Device and Drive Device". technical field [0002] The invention relates to a method for operating a drive unit. Furthermore, the invention relates to a drive device. Background technique [0003] This application claims priority from German patent application DE10 2011 122 442.8 of 2011.12.24. The disclosure content of this document is hereby included in its entirety in the disclosure of the present application. [0004] In vehicles, such as passenger cars or trucks, a drive device in the form of an internal combustion engine is usually used for driving the vehicle. Internal combustion engines are usually gasoline or diesel engines. In order to reduce the operating costs and emissions of the vehicle and to increase the operating efficiency and comfort of the vehicle, numerous improvements ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D23/02F02D21/08F02M26/05F02D13/02
CPCF02B37/04F02B37/18F02B37/24F02D13/0269F02D21/08F02D23/02F02D41/0007F02D2041/001F02M26/05Y02T10/12
Inventor H.霍夫迈尔P.格内格尔N.林登坎普J.特奥巴尔德
Owner VOLKSWAGEN AG