Procedure to operate an internal combustion engine

Abstract

Procedure to operate an internal combustion engine, especially a gasoline engine with direct gasoline injection, in a controlled self-ignition, whereby the internal combustion engine comprises a combustion chamber at least one intake valve and at least one exhaust valve, whose opening times are changeable, and comprises as well an adjustable exhaust gas recirculation and a gas mixture capable of ignition, which contains the residual gas, which is compressed in the combustion chamber during a compression stroke, whereby the gas mixture self-ignites toward the end of the compression stroke.

Description

SHORT DESCRIPTION OF THE DRAWINGS

FIG. 1 an outline of a cylinder of an internal combustion engine;

FIG. 2 a diagram of the combustion chamber pressure plotted against the crankshaft angle;

FIG. 3 opening and closing times of the charge-cycle valves;

FIG. 4 residual gas proportions from the inner and outer exhaust gas recirculation plotted against the time.

Claims

1. A method of operating an internal combustion engine, especially a gasoline engine with direct gasoline injection, in a controlled self-ignition, whereby the internal combustion engine includes a combustion chamber, at least one intake valve and at least one exhaust valve, whose opening times are changeable, an adjustable exhaust gas recirculation, and a gas mixture capable of ignition, which contains residual gas, which is compressed in the combustion chamber during a compression stroke, whereby the gas mixture self-ignites toward the end of the compression stroke, the method comprising moving the residual gas into the combustion chamber by using internal and external exhaust gas recirculation.

2. A method according to claim 1, further comprising controlling a temperature of the gas mixture by proportions of residual gas from the external exhaust gas recirculation and of residual gas from the internal exhaust gas recirculation of the exhaust gas recirculation.

3. A method according to claim 2, wherein a base rate of the exhaust gas recirculation is provided by the external exhaust gas recirculation, which remains unchanged for more than one working cycle.

4. A method according to claim 3, wherein an auxiliary rate of residual gas is added to the base rate from the internal exhaust gas recirculation.

5. A method according to claim 4, wherein the auxiliary rate is cycle-true controlled.

6. A control device for an internal combustion engine, especially a gasoline engine with direct gasoline injection, whereby the internal combustion engine includes a combustion chamber, at least one intake valve and at least one exhaust valve, whose opening times are changeable, an adjustable exhaust gas recirculation and a gas mixture capable of ignition, which contains residual gas, which is compressed in the combustion chamber during a compression stroke, whereby the gas mixture self-ignites toward the end of the compression stroke, the control device causing residual gas to moves into, and respectively remains in, the combustion chamber by way of internal and external exhaust gas recirculation.