Method for combined identification of phase differences of inlet valve stroke and outlet valve stroke of internal combustion engine with aid of lines of equal phase position and amplitude

Abstract

The invention relates to a method for the combined identification of an inlet valve stroke phase difference and an outlet valve stroke phase difference of a cylinder of an internal combustion engine,said method being based on the determination of the phase position and the amplitude of a selected signal frequency of the pressure oscillations with regard to a phase angle signal of the crankshaft resulting from dynamic pressure oscillations of the intake air in the air intake tract, which are assignable to the respective cylinder. The inlet valve stroke phase difference and the outlet valve stroke phase difference are then determined on the basis of these phase positions and amplitudes with the aid of lines of equal phase position and lines of equal amplitude. In this way, it is possible tocarry out a particularly accurate identification of the control times in a simple and cost-effective manner, whereby advantages with regard to emissions, consumption, running smoothness and power aswell as an improvement in controllability and control of the engine can be achieved.

Description

technical field [0001] The invention relates to a method by means of which the phase difference of the valve strokes of the inlet and outlet valves of a reciprocating piston internal combustion engine can be identified during operation in a combined form by evaluating the dynamic pressure oscillations of the intake air, in the air The dynamic pressure oscillations are measured in the intake tract. Background technique [0002] Reciprocating-piston internal combustion engines, which will also be referred to simply as internal combustion engines hereinafter, have one or more cylinders, in each case one reciprocating piston being arranged in the cylinder. To illustrate the principle of a reciprocating piston internal combustion engine, reference will be made below to figure 1 , which shows by way of example the cylinders and the most important functional units of an internal combustion engine, which may also be a multi-cylinder internal combustion engine. [0003] The respect...

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Problems solved by technology

Specific conclusions about valve control timing and piston stroke position of internal combustion engines cannot be easily drawn by means of this method either

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