Method and control system for operating an internal combustion engine
AssigneeMAN Energy Solutions SE
InventorsAndreas Döring, Armin Weber
Life of this patent
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Abstract
A method for operating an internal combustion engine with multiple cylinders. Each cylinder of the internal combustion engine includes at least one fuel injector, and each fuel injector is activated for opening and closing via a solenoid valve of the respective fuel injector. Structure-borne sound waves emitted by the fuel injectors and/or accelerations caused by the fuel injectors are detected by measurement. The structure-borne sound waves detected by measurement and/or the accelerations detected by measurement are evaluated, and based on the evaluation, characteristics of the fuel injectors are automatically determined.
Claims14
A method for operating an internal combustion engine having multiple cylinders, wherein each cylinder comprises at least one fuel injector 4, comprising:
- activating each fuel injector to open and close a solenoid valve of a respective fuel injector;
- detecting by measurement at least one of structure-borne sound waves emitted by the fuel injectors and accelerations caused by the fuel injectors;
- evaluating the at least one of the structure-borne sound waves detected by measurement and the accelerations detected by measurement are evaluated;
- automatically determining, based on the evaluation, characteristics of the fuel injector;
- and at least one of:
- (1) activating the solenoid valve of the fuel injector, during a stationary state of the internal combustion engine, for opening and closing without fuel injection pressure on the fuel injectors;
- detecting the at least one of the structure-borne sound waves emitted by the fuel injectors and the accelerators caused by the fuel by measurement;
- and
- dependent on a comparison of the actual measurement quantities with set point quantities, a solenoid valve-dependent drift or wear of the fuel injectors is identified;
- and
- (2) operating the internal combustion engine in an injection mode during which the solenoid valve of the fuel injector is activated for opening and closing with fuel injection pressure on the fuel injectors;
- detecting the at least one of the sound waves emitted by the fuel injectors and the accelerations caused by the fuel injector by measurement;
- and
- dependent on a comparison of the actual measurement quantities with at least one of set point quantity one of a nozzle needle-dependent and nozzle seat-dependent drift or wear of the fuel injectors is identified.
A control system for operating an internal combustion engine, wherein the control system, on a control side, is configured to:
- activate each fuel injector to open and close a solenoid valve of a respective fuel injector;
- detect by measurement at least one of structure-borne sound waves emitted by the fuel injectors and accelerations caused by the fuel injectors;
- evaluate the at least one of the structure-borne sound waves detected by measurement and the accelerations detected by measurement are evaluated;
- and
- automatically determine, based on the evaluation, characteristics of the fuel injector;
- automatically determining, based on the evaluation, characteristics of the fuel injector;
- and at least one of:
- (1) activate the solenoid valve of the fuel injector, during a stationary state of the internal combustion engine, for opening and closing without fuel injection pressure on the fuel injectors;
- detect the at least one of the structure-borne sound waves emitted by the fuel injectors and the accelerators caused by the fuel by measurement;
- and
- dependent on a comparison of the actual measurement quantities with set point quantities, a solenoid valve-dependent drift or wear of the fuel injectors is identified;
- and
- (2) operate the internal combustion engine in an injection mode during which the solenoid valve of the fuel injector is activated for opening and closing with fuel injection pressure on the fuel injectors;
- detect the at least one of the sound waves emitted by the fuel injectors and the accelerations caused by the fuel injector by measurement;
- and
- dependent on a comparison of the actual measurement quantities with at least one of set point quantity one of a nozzle needle-dependent and nozzle seat-dependent drift or wear of the fuel injectors is identified.
Dependencies are inferred from the claim text.