Method for controlling an internal combustion engine

Patent metadata

Field	Value
Publication number	US-9771881-B2
Application number	US-201414547161-A
Country	US
Kind code	B2
Filing date	Nov 19, 2014
Priority date	Nov 25, 2013
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A method controls an internal combustion engine having a drive output shaft that is coupled to an input shaft of a transmission. The internal combustion engine and the transmission are encompassed by a drivetrain for the drive of a motor vehicle. The method includes determining a rotational speed of the drive output shaft of the internal combustion engine and determining a rotational acceleration of the drive output shaft based on the rotational speed of the drive output shaft. A dynamic torque of the internal combustion engine is determined as a product of the rotational acceleration and a dynamic moment of inertia of the internal combustion engine. A maximum combustion torque of the internal combustion engine is determined from a sum of a predetermined maximum torque at the input shaft of the transmission and the dynamic load torque of the internal combustion engine.

First claim

The invention claimed is:

1. A method for controlling an internal combustion engine having a drive output shaft that is coupled to an input shaft of a transmission, the internal combustion engine and the transmission being encompassed by a drivetrain for the drive of a motor vehicle, and the method comprising the steps of:
determining a rotational speed of the drive output shaft of the internal combustion engine;
determining a rotational acceleration of the drive output shaft based on the rotational speed of the drive output shaft;
determining a dynamic load torque of the internal combustion engine as a product of the rotational acceleration and a dynamic moment of inertia of the internal combustion engine, the dynamic load torque being a torque generated by a rotationally acting mass moment of inertia of the internal combustion engine in the event of a change in engine rotational speed; and
determining a maximum combustion torque of the internal combustion engine from a sum of a predetermined maximum torque at the input shaft of the transmission and the dynamic load torque of the internal combustion engine.

2. The method as recited in claim 1 , wherein the combustion torque of the internal combustion engine is restricted to a maximum admissible combustion torque.

3. The method as recited in claim 2 , wherein the combustion torque is controlled as a function of a demanded torque for as long as the demanded torque does not exceed a maximum admissible transmission input torque.

4. The method as recited in claim 1 , wherein the rotational acceleration of the drive output shaft is determined based on a derivation of the rotational speed of the drive output shaft with respect to time.

5. The method as recited in claim 1 , further comprising determining that a clutch for coupling the output shaft of the internal combustion engine to the input shaft of the transmission is at least partially open.

6. The method as recited in claim 5 , wherein an extent of opening of the clutch is controllable using a clutch pedal, and the method includes detecting a position of the clutch pedal.

Assignees

• Porsche Ag

Inventors

• Baur Peter
• Martiny Moritz

Classifications

• F02D41/022

  in relation with the clutch status · CPC title

• B60W2710/0666

  Engine torque · CPC title

• F02D2250/26

  by applying a torque limit · CPC title

• B60W2510/0685

  Engine crank angle · CPC title

• F02D2250/18

  Control of the engine output torque · CPC title