Method and device for operating an internal combustion engine
View Patent ↗An internal combustion engine has an intake duct, which opens into at least one inlet of at least one cylinder. It also has a tank purging valve, which is configured to control the initiation of a tank purging flow into the intake duct at an inlet point upstream of the respective inlet of the respective cylinder. A main path is configured in the intake duct and a recirculation path is configured there with a recirculation control element, a recirculation inlet from the main path into the recirculation path and a recirculation outlet from the recirculation path into the main path. The recirculation outlet is disposed in the main path upstream in relation to the recirculation inlet. A cylinder tank purging fuel mass is determined as a function of an opening angle of the tank purging valve and an opening angle of the recirculation control element.
1. A method for operating an internal combustion engine having a cylinder and an intake duct with a main path that opens into an inlet of the cylinder, comprising:
configuring a tank purging valve to control initiation of a tank purging flow into the intake duct at an inlet point upstream of the respective inlet of the cylinder;
configuring a recirculation path in parallel with the main path where the recirculation path has:
a recirculation inlet arranged in the main path,
a recirculation control element arranged in the recirculation path that controls the opening of the recirculation path, and
a recirculation outlet arranged into the main path upstream of the recirculation inlet; and
determining a cylinder tank purging fuel mass that flows into a cylinder during the working cycle of the cylinder to a previous measuring in of fuel, where the cylinder tank purging fuel mass is determined as a function of an opening angle of the tank purging valve and an opening angle of the recirculation control element.
2. The method as claimed in claim 1 , wherein the cylinder tank purging fuel mass is determined by a dynamic physical model of the recirculation path.
3. The method as claimed in claim 2 , wherein the dynamic physical model comprises:
a recirculation ring store for storing a recirculation tank purging values representative of a tank purging fuel mass that flows into the recirculation path on the inlet side during a predetermined time period,
the recirculation tank purging values are determined for storage in the recirculation ring store as a function of the opening angle of the recirculation control element and an output main path tank purging value that is representative of a tank purging fuel mass that flows to the recirculation inlet in the main path during the predetermined time period, and
determining a recirculation tank purging value flowing through the recirculation outlet as a function of the opening angle of the recirculation control element from the recirculation ring store.
4. The method as claimed in claim 2 , wherein the internal combustion engine comprises a plurality of cylinders, each cylinder having a cylinder inlet connected to the intake duct.
5. A device for operating an internal combustion engine having an intake duct connected to a cylinder inlet, a tank purging valve configured to control an initiation of a tank purging flow into the intake duct, the tank purging valve arranged at an inlet point upstream of the cylinder inlet, a main path arranged in the intake duct and a recirculation path arranged parallel to the main path and configured with a recirculation control element, a recirculation inlet. from the main path into the recirculation path and a recirculation outlet from the recirculation path into the main path where the recirculation outlet is disposed in the main path upstream in relation to the recirculation inlet, comprising:
a first cylinder tank purging fuel mass determining device that determines a cylinder tank purging fuel mass that flows into the cylinder during the working cycle of the cylinder to a previous measuring in of fuel; and
a second cylinder tank purging fuel mass determining device that determines a cylinder tank purging fuel mass as a function of an opening angle of the tank purging valve and an opening angle of the recirculation control element.
6. The device as claimed in claim 5 , wherein the cylinder tank purging fuel mass is determined by a dynamic physical model of the recirculation path.
7. The device as claimed in claim 6 , wherein the dynamic physical model comprises:
a recirculation ring store for recirculation tank purging values representative of a tank purging fuel mass that flows into the recirculation path on the inlet side during a predetermined time period,
the recirculation tank purging values are determined for storage in the recirculation ring store as a function of the opening angle of the recirculation control element and an output main path tank purging value that is representative of a tank purging fuel mass that flows to the recirculation inlet in the main path during the predetermined time period, and
determining a recirculation tank purging value flowing through the recirculation outlet as a function of the opening angle of the recirculation control element from the recirculation ring store.
8. The method as claimed in claim 6 , wherein the internal combustion engine comprises a plurality of cylinders, each cylinder having a cylinder inlet connected to the intake duct.
9. An internal combustion engine system, comprising:
a block having a cylinder;
a crank shaft rotably mounted in the block;
a piston arranged in the cylinder of the block;
a cylinder head arranged on the block;
a cylinder inlet arranged in the cylinder head;
an intake duct connected to the cylinder inlet having a main path that inlets an inlet flow into the cylinder;
a tank purging valve arranged at an inlet point upstream of the cylinder inlet the tank purging valve configured to control an initiation of a tank purging flow into the intake duct;
a recirculation path arranged parallel to the main path and configured with:
a recirculation inlet arranged at a union of the recirculation path and the main path,
a recirculation control element arranged in the recirculation path that controls the opening of the recirculation path, and
a recirculation outlet arranged at a union of the recirculation path and the main path upstream relative to the recirculation inlet;
a first cylinder tank purging fuel mass determining device that determines a cylinder tank purging fuel mass that flows into the cylinder during the working cycle of the cylinder to a previous measuring in of fuel; and
a second cylinder tank purging fuel mass determining device that determines a cylinder tank purging fuel mass as a function of an opening angle of the tank purging valve and an opening angle of the recirculation control element.
10. The system as claimed in claim 9 , wherein the internal combustion engine comprises a plurality of cylinders, each cylinder having a cylinder inlet connected to the intake duct.
11. The system as claimed in claim 9 , wherein the cylinder tank purging fuel mass is determined by a dynamic physical model of the recirculation path.
12. The device as claimed in claim 11 , wherein the dynamic physical model comprises:
a recirculation ring store for recirculation tank purging values representative of a tank purging fuel mass that flows into the recirculation path on the inlet side during a predetermined time period,
the recirculation tank purging values are determined for storage in the recirculation ring store as a function of the opening angle of the recirculation control element and an output main path tank purging value that is representative of a tank purging fuel mass that flows to the recirculation inlet in the main path during the predetermined time period, and
determining a recirculation tank purging value flowing through the recirculation outlet as a function of the opening angle of the recirculation control element from the recirculation ring store.