Procedure and device for determining the composition of a fuel mixture
First Claim
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1. A method of determining a composition of a fuel mixture consisting of a first fuel and at least a second fuel for operating a self-igniting combustion engine with at least one sensor that is determining a course of combustion in at least one cylinder of the combustion engine, the method comprising:
- creating a measure for stability of the combustion process from a parameter that characterizes a combustion process in at least one cylinder of the combustion engine, wherein the determination of the composition of the fuel mixture takes place from the measure for the stability of the combustion process;
adjusting operating parameters of the combustion engines such that the measure for the stability of the combustion process does not exceed a predefined threshold value for the stability of the combustion process; and
providing one or more of the following for complying with the predefined threshold value;
an increase of a remaining gas mass in the at least one cylinder of the combustion engine;
an early shifting of a nominal value of a regulation of a combustion focus position; and
an introduction of a pre-injection of fuel.
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Abstract
The procedure and device of the present disclosure enable an accurate determination of the composition of the fuel mixture at a self-igniting combustion engine on the basis of present sensor signals. The procedure and device of the present disclosure furthermore enable the detection and compensation of a combustion that is unstable due to the composition of the fuel mixture.
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Citations
9 Claims
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1. A method of determining a composition of a fuel mixture consisting of a first fuel and at least a second fuel for operating a self-igniting combustion engine with at least one sensor that is determining a course of combustion in at least one cylinder of the combustion engine, the method comprising:
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creating a measure for stability of the combustion process from a parameter that characterizes a combustion process in at least one cylinder of the combustion engine, wherein the determination of the composition of the fuel mixture takes place from the measure for the stability of the combustion process; adjusting operating parameters of the combustion engines such that the measure for the stability of the combustion process does not exceed a predefined threshold value for the stability of the combustion process; and providing one or more of the following for complying with the predefined threshold value; an increase of a remaining gas mass in the at least one cylinder of the combustion engine; an early shifting of a nominal value of a regulation of a combustion focus position; and an introduction of a pre-injection of fuel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A self-igniting combustion engine comprising:
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a device configured for determining a composition of a fuel mixture consisting of a first fuel and at least a second fuel for operating the self-igniting combustion engine with a variable or partially variable valve operation for a variable adjustment of valve openings in relation to a crankshaft angle and for a variable adjustment of opening profile of the valves; a direct injection for metering the fuel mixture; at least one sensor for determining the combustion process in at least one cylinder of the combustion engine; a regulating unit for regulating the combustion engine on the basis of the output signal of the at least one sensor; and an engine electronic unit, wherein the output signal of the sensor is delivered to the engine electronic unit as a measure for the combustion process and saved over a predefined amount of combustion cycles, and wherein for determining a measure for the stability of the combustion, a statistic evaluation of the combustion courses is carried out within the engine electronic unit and that from the obtained measure for the stability of the combustion, the composition of the fuel mixture can be determined and a correction of the regulation of the combustion engine can be carried out. - View Dependent Claims (9)
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Specification