Internal combustion engine exhaust gas conveying device with internal lining, as well as process for production thereof

Inactive Publication Date: 2006-08-03
DAIMLER AG
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] Such a modified structure facilitates the hydrocarbon condensation, in particular a hydrocarbon capillary condensation, and features in addition a capillary attraction which transports the hydrocarbon-condensate into the interior of the structure and / or into regions of lower exhaust gas concentration and / or retains the hydrocarbon-condensate until its desorption.

Problems solved by technology

Already during the cold start phase the coating of the exhaust manifold is exposed to exhaust gases with temperatures of up to 1050° C. This is a disadvantage since the coating rapidly heats up to it's desorption temperature and consequently it buffers only small amounts of hydrocarbon during the heat up period of the catalytic converter to its light off temperature.
Furthermore, the coating which is directly applied to the internal walls of the exhaust manifold is exposed to high mechanical loads.
A disadvantage of this approach is the unadjusted heat transfer or, as the case may be, heat removal.
Although this is an advantage during the cold start phase, since the catalytic converter reaches its light off temperature faster, this thermal insulation also results in a higher heat load for the catalytic converter during continuous operation, with the danger of overheating the catalyst material.
Since the known sintered ceramics as an inlay for exhaust gas conveying apparatuses or conduits usually feature only a low mechanical strength, the material of the conduit must essentially carry the entire mechanical load, so that the construction of the conduits cannot be designed lighter than in an apparatus without liners.
The resulting weight gain of the overall system of the exhaust gas conduits is a disadvantage with respect to the desired lightweight construction.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Internal combustion engine exhaust gas conveying device with internal lining, as well as process for production thereof
  • Internal combustion engine exhaust gas conveying device with internal lining, as well as process for production thereof

Examples

Experimental program
Comparison scheme
Effect test

second embodiment

[0043] According to the invention shown in FIG. 2 completely (through holes) and partially penetrating bores are machined into the liner of an exhaust manifold spaced at irregular distances to each other between 0 and 3 mm with various orientations and angles to the surface and with different diameters between 0.1 and 0.5 mm by laser drilling, such that a meshwork of bores which are either connected or not connected to each other results.

third embodiment

[0044] According to the invention, which is not shown in the illustrations, bores with a diameter decreasing from the surface going into the liner are machined into said liner.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Depthaaaaaaaaaa
Login to View More

Abstract

Exhaust gas conveying apparatus of an internal combustion engine with internal liner in which the liner features capillary bores which are open at least towards the exhaust gas conveying side of the liner as well as process for the fabrication of said apparatus.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit of German Application No. DE 10 2005 004 651.7 filed Feb. 2, 2005. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to an exhaust gas conveying apparatus of an internal combustion engine with an internal liner and a process for its fabrication. [0004] The continuous reduction of the permissible pollutant emissions of motor vehicles requires continuous improvement in the treatment of exhaust gas. Special attention is paid to the exhaust gas treatment during the cold start phase. Immediately after the start relatively high quantities of unburned hydrocarbons are emitted. The reason for this, amongst others, is that the catalytic converter has not yet reached its light-off temperature, resulting in an insufficient conversion of the hydrocarbons. [0005] Usually the catalytic converter reaches its light-off temperature about one minute after the start of the engine t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F01N7/14F01N3/10F01N13/10F01N13/14
CPCB23K26/381F01N3/0807F01N3/0814F01N3/0835F01N3/2006F01N3/2046F01N3/2807F01N13/102F01N13/143F01N2240/10F01N2240/18F01N2240/22F01N2240/26F01N2330/02F01N2330/04F01N2330/06F01N2330/14F01N2330/18F01N2370/24F01N2450/22F01N2450/28F01N2470/04F01N2570/12Y02T10/26B23K26/4005B23K26/408B23K26/382B23K26/40B23K2103/50B23K2103/52Y02T10/12
InventorBAUR, HARTMUTLOEFFLER, ERWINMUSIOL, JOHANNA
OwnerDAIMLER AG