Method and device for controlling an internal combustion engine

• US 20030029415A1
• Filed: 07/17/2002
• Published: 02/13/2003
• Est. Priority Date: 07/18/2000
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Hammel, Christof, Kellner, Andreas, Pfaeffle, Andreas, Schubert, Peter
• Granted Patent: US 6,752,126 B2
• Time in Patent Office: Days
• US Class Current: 123/299
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: F02D 2200/0614 Actual fuel mass or fuel injection amount
• CPC Class Codes: F02D 2250/04 Fuel pressure pulsation in common rails
• CPC Class Codes: F02D 41/3809 Common rail control systems common rail apparatus F02M55/025, F02M63/0225
• CPC Class Codes: F02D 41/402 Multiple injections
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method and a device are described for controlling an internal combustion engine. The fuel metering is divisible into at least a first partial injection and a second partial injection. In the second partial injection, a fuel quantity variable, characterizing the fuel quantity injected in the second partial injection, is corrected on the basis of at least one pressure variable, characterizing the fuel pressure, as well as of the fuel quantity variable and at least one further variable.

Claims

1. A method for controlling an internal combustion engine, the fuel metering being divisible into at least a first partial injection and a second partial injection,

wherein, in the second partial injection, a fuel-quantity variable, which characterizes the fuel quantity injected during the second partial injection, is able to be corrected as a function of at least one pressure variable, which characterizes the fuel pressure, of the fuel quantity variable, and of at least one further variable.

2. The method as recited in claim 1,

wherein a correction value is determined for the fuel quantity to be injected on the basis of a basic value that is arrived at using a weighting factor.

3. The method as recited in one of the preceding claims,

wherein the basic value is determined as a function of at least the pressure variable and an interval between the two partial injections or as a function of at least the pressure variable and the fuel quantity injected in the first partial injection.

4. The method as recited in one of the preceding claims,

wherein the weighting factor is determined as a function of at least the fuel quantity variable.

5. The method as recited in one of the preceding claims,

wherein as a further variable a temperature variable is used.

6. The method as recited in one of the preceding claims,

wherein the corrected fuel quantity variable is limited to a minimum value.

7. The method as recited in claim 6,

wherein the minimum value may be stipulated at least as a function of the rail pressure and/or of the interval between the two partial injections.

8. The method as recited in one of the preceding claims,

wherein the correction is carried out after a further correction, using a quantity balancing regulation.

9. The method as recited in one of the preceding claims,

wherein the correction is only performed in certain operating states.

10. A device for controlling an internal combustion engine, the fuel metering being divisible into at least a first partial injection and a second partial injection,

wherein means are provided which, in the second partial injection, correct a fuel quantity which characterizes the fuel quantity injected in the second partial injection, as a function of at least one pressure variable, which characterizes the fuel pressure, as well as of the fuel quantity variable and at of least one further variable.