Patent · US Expired

Method of reducing emissions in the exhaust gases of an internal combustion engine

US6681562B2 · kind B2 · utility

3Cited by

9References

12Claims

0Family size

Assignee

VOLVO CAR CORPORATION · SE

Inventors

Lars Allevåg · Umeå, SE
Goran Almkvist · Lerum, SE
Ingemar Bredström · Umeå, SE
Karin Thorn · Umeå, SE

Key dates

Filing date	Dec 11, 2001
Grant date	Jan 27, 2004
Priority date	—
Expiry date	Dec 11, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/12
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A method of reducing emissions in the exhaust gases of an internal combustion engine is disclosed. The engine includes at least one cylinder supplied with an air/fuel mixture when a crankshaft of the internal combustion engine rotates, at least one intake valve, at least one exhaust valve, control members for controlling the opening and closing of the intake and exhaust valves, and a piston reciprocating between a top dead-center position and a bottom dead-center position in the cylinder. The method includes supplying an air/fuel mixture with a lambda value greater than 1 to the cylinder, controlling the intake valve so that it opens after the piston has passed the top dead-center position, controlling the exhaust valve so that it opens before the piston has passed the bottom dead-center position, and controlling the exhaust valve so that it closes before the intake valve opens.

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