Method and device for controlling a camshaft phase adjuster in an internal combustion engine

Abstract

A method for operating an internal combustion engine having a camshaft phase adjuster, including: providing a nonlinear final control element model, which indicates via a functional relationship an angular velocity of a relative adjustment of the camshaft phase adjuster as a function of an actuator correcting variable for the control of the camshaft phase adjuster; carrying out a control based ona deviation between a predefined camshaft angle adjustment setpoint value, and a camshaft angle adjustment actual value, to obtain as a control output a setpoint positioning rate of the camshaft phaseadjuster, wherein the predefined camshaft angle adjustment setpoint value indicates a setpoint value of the relative displacement between the crankshaft position angle and the camshaft position angle; calculating the actuator correcting variable as a function of the setpoint positioning rate using an inverted final control element model; applying a predefined correction variable to the actuator correcting variable; controlling the camshaft phase adjuster using the actuator correcting variable to which the correction variable has been applied, to operate the internal combustion engine.

Description

technical field [0001] The invention relates to a combustion motor, and in particular to a combustion motor in which the intake and exhaust valves are actuated by means of a camshaft. The invention also relates to a combustion motor with a camshaft phase adjuster with which the phase of the opening duration of the intake or exhaust valves can be adjusted. Background technique [0002] In reciprocating piston combustion engines, the valve operation of the intake and exhaust valves is usually controlled mechanically by means of an intake or exhaust camshaft. The cams of the respective camshaft act on the pushrods of the intake or exhaust valves and, synchronously with the rotation of the crankshaft of the combustion motor, predetermine the phases in which the intake and exhaust valves are opened. [0003] In order to obtain a further degree of freedom in the operation of the combustion engine, the camshaft can be provided with a camshaft phase adjuster which changes the phase...

AI Technical Summary

Problems solved by technology

[0006] Due to batch deviations during production and aging effects during vehicle operation, noticeable deviations may occur in the system to be controlled and as a consequence in the quality of the control which leads to Overshoot (Überschwingen), static control deviation, etc.

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