Patent · US Active

Method for reducing pollutant emissions and consumption of an engine

US8171914B2 · kind B2 · utility

5Cited by

7References

14Claims

0Family size

Assignee

CONTINENTAL AUTOMOTIVE GMBH · DE

Inventors

Frank Atzler · Dettenhofen, DE
Oliver Kastner · Donaustauf, DE
Andreas Weigand · Eschborn, DE

Key dates

Filing date	Aug 30, 2007
Grant date	May 8, 2012
Priority date	—
Expiry date	Jul 14, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

To reduce pollutant emissions and consumption of passenger cars diesel engines multiple injection strategies are applied. Assuming constant cylinder and bowl geometry and constant rail pressure the variation of the number of injections, injection quantity of each injection and separation between two consecutive injections are the major parameters to be optimised. Furthermore, a single injection is applied with a shaped injection rate by a rise in injection pressure, equal to that observed in cam controlled injection systems. The needle lift can be modified for piezo driven common rail injection systems.Both methods are compared in terms of pollutant emission, fuel consumption and robustness. Experiments were carried out on single cylinder research engines. Multiple injection strategies with large hydraulic dwell times were compared with a short dwell setting simulating a “rate shaped” single injection. Rate shaping was implemented performing multiple injections with hydraulic dwell times close to or equal zero.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.