INDEXING SYSTEM AND METHOD FOR DETERMINING AN ENGINE PARAMETER

• US 20100030446A1
• Filed: 02/04/2008
• Published: 02/04/2010
• Est. Priority Date: 02/15/2007
• Status: Active Grant

• Current Assignee: AVL List GmbH (List Privatstiftung)
• Original Assignee: AVL List GmbH (List Privatstiftung)
• Inventors: Leitmeier, Klaus, Moik, Josef, Harms, Klaus-Christoph, Fernitz, Gernot, Teichmann, Rüdiger, Rzehorska, Martin
• Granted Patent: US 8,170,777 B2
• Time in Patent Office: Days
• US Class Current: 701/101
• CPC Class Codes: F02D 2041/227 Limping Home, i.e. taking specific engine control measures at abnormal conditions
• CPC Class Codes: F02D 2041/281 between sensors and control unit
• CPC Class Codes: F02D 35/023 by determining the cylinder pressure
• CPC Class Codes: F02D 41/009 using means for generating position or synchronisation signals
• CPC Class Codes: F02D 41/222 relating to the failure of sensors or parameter detection devices

Abstract

To reduce the complexity of an indicating system 6 on an internal combustion engine for determining a parameter, the invention provides that on the basis of the measured variable a computing unit 8 for the indicating system 6 computes crank angle information, and on the basis of the crank angle information thus computed and the measured variable determines an engine parameter.

Claims

1. An indicating system for determining at least one engine parameter, comprising a sensor unit (10) which records a measured variable having a component that is dependent on the crank angle, and a computing unit (12) which is connected to the sensor unit (10) via an input (14), wherein the computing unit (12) computes crank angle information on the basis of the measured variable recorded by the sensor unit 10), and on the basis of the measured variable and the computed crank angle information determines at least one engine parameter which requires knowledge of crank angle information and emits same as an output signal to an output (13).

2. The indicating system according to claim 1, wherein a signal amplifier (11), in particular a charge amplifier, is provided in the system between the sensor unit (10) and the computing unit (12).

3. The indicating system according to claim 1, wherein an additional parameter may be determined in the computing unit (12) solely on the basis of the measured variable.

4. The indicating system according to claim 1, wherein an evaluation unit (8) is provided with multiple inputs (14) for various measurement channels, and each measurement channel is provided with its own computing unit (12).

5. The indicating system according to claim 1, wherein an evaluation unit (8) having multiple inputs for various measurement channels is provided, and a single computing unit (12) is provided for the measurement channels or for a group of measurement channels.

6. The indicating system according to claim 1, including a filter unit and/or a signal conditioning device and/or an amplifier is provided in the system (6).

7. The indicating system according to claim 1, wherein the system (6) is situated in a common housing (9).

8. The indicating system according to claim 1, wherein the system (6) includes an engine control device (7).

9. The indicating system according to claim 8, wherein a computing unit for the engine control device (7) is provided as an evaluation unit.

10. An engine control system having an indicating system according to claim 1, wherein the indicating system (6) is connected to an engine control device (7) and supplies the engine control device (7) with at least one engine parameter which is used in the engine control device (7) for controlling the engine.

11. A method for determining at least one parameter of an engine, in which an indicating system (6) is installed on the engine or a unit of the engine, and by use of a sensor unit (10) for the indicating system (6) a measured variable having a component that is dependent on the crank angle is measured, comprising computing crank angle information using a computing unit (8) for the indicating system on the basis of the measured variable, and on the basis of the measured variable and the computed crank angle information determining the engine parameter.

12. The method according to claim 11, comprising determining an additional parameter, which may be determined solely from the measured variable.

13. The method according to claim 11, wherein the engine parameter is used in an engine control device (7) of an engine control system for controlling the engine.