US 10,989,149 B2Granted

Internal combustion engine and method for controlling such an internal combustion engine

AssigneeFreevalve AB

InventorsAnders Höglund, Urban Carlson

Life of this patent

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Abstract

An internal combustion engine includes combustion chambers, each having a controllable intake valve opening and closing an intake port, a controllable exhaust valve opening and closing an exhaust port, a piston displaceable back and forth in the combustion chamber between a top dead center and a bottom dead center, and a fuel injector. The engine further including an intake manifold connected to the intake port of each combustion chamber. The engine can be operated in a low load mode, wherein each combustion chamber is driven in four-stroke operation including a 720 crank angle degrees cycle, and opens the intake port during the exhaust stroke, the intake port starting to open in 610-690 CAD, closing the exhaust port during the exhaust stroke, becoming fully closed in 630-710 CAD, forcing exhaust gas into the intake manifold by the piston, and mixing fuel and exhaust gas in the intake manifold.

Claims20

Dependent claims

An internal combustion engine (1) comprising a set of combustion chambers, each combustion chamber (2) being provided with:

a controllable intake valve (7) configured for opening and closing an intake port (8),
a controllable exhaust valve (9) configured for opening and closing an exhaust port (10),
a piston (5) displaceable back and forth in said combustion chamber (2) between a top dead center (TDC) and a bottom dead center (BDC), and
a fuel injector (14),
the internal combustion engine (1) further comprising an intake manifold (12) connected to the intake port (8) of each combustion chamber of said set of combustion chambers, wherein the internal combustion engine (1) is configured to be operated in a low load mode (LL), wherein each combustion chamber (2) is configured to be driven in four-stroke operation comprising a 720 crank angle degrees cycle, wherein the internal combustion engine (1) is configured to perform the following activities:
open the intake port (8) during the exhaust stroke, the intake port (8) starting to open in the range 610 to 690 CAD, and close the exhaust port (10) during the exhaust stroke, the exhaust port (10) becomes fully closed in the range 630 to 710 CAD, wherein the exhaust gas is forced into the intake manifold (12) by means of the piston (5), and
mix fuel and exhaust gas in the intake manifold (12).

4 more elements

A method for controlling an internal combustion engine (1) comprising a set of combustion chambers, each combustion chamber (2) being provided with:

a controllable intake valve (7) configured for opening and closing an intake port (8),
a controllable exhaust valve (9) configured for opening and closing an exhaust port (10),
a piston (5) displaceable back and forth in said combustion chamber (2) between a top dead center (TDC) and a bottom dead center (BDC), and
a fuel injector (14),
the internal combustion engine (1) further comprising an intake manifold (12) connected to the intake port (8) of each combustion chamber of said set of combustion chambers, the method being wherein the internal combustion engine (1) is operated in a low load mode (LL), wherein each combustion chamber (2) is driven in four-stroke operation comprising a 720 crank angle degrees cycle, wherein the method comprises the activities of:
opening the intake port (8) during the exhaust stroke, the intake port (8) starting to open in the range 610 to 690 CAD,
closing the exhaust port (10) during the exhaust stroke, the exhaust port (10) becomes fully closed in the range 630 to 710 CAD,
forcing the exhaust gas into the intake manifold (12) by means of the piston (5), and
mixing fuel and exhaust gas in the intake manifold (12).

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/645,873Filed 10 Sep 2018
Priority: SE 1751095-911 Sep 2017
Published: US 2020/0256288 A113 Aug 2020
Granted: 27 Apr 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

F02M 26/01
Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR]…
F02D 13/0203
During engine operation: variable control of intake and exhaust valves
F02D 41/006
Controlling exhaust gas recirculation [EGR]: using internal EGR
F02D 41/345
With means for controlling injection timing or duration: controlling injection timing