Method for controlling an engine valve of an internal combustion engine

Abstract

An internal combustion engine system is equipped with a controllable engine valve actuation system. Controlling lift of an engine valve includes periodically monitoring engine valve lift and engine crank angle. A preferred engine valve lift profile is determined in a crank angle-domain. A preferred engine valve position is determined in the crank angle-domain. The preferred engine valve position is interpolated to determine a preferred engine valve position in the time-domain. The control circuit is actuated to control the engine valve in the time-domain.

Description

technical field [0001] This invention relates to repetitive controllers for use in internal combustion engines. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Internal combustion engines can use camless variable valve actuation systems, including fully flexible valve actuation (FFVA) systems. A valve train system including fully flexible valve actuation provides full control over engine valve opening duration, engine valve opening phasing relative to crankshaft rotation, and engine valve lift magnitude from fully closed to fully open without requiring Depends on the cam surface profile. Electrically or hydraulically controlled fully flexible valve actuation systems allow the valves to open multiple times during an engine cycle, or not open at all (such as in a cylinder deactivation event). [0004] Internal combustion engine control includes tim...

AI Technical Summary

Problems solved by technology

Inaccurate conversion from time domain based control to crank angle domain based control can lead to undesired engine valve movement resulting in poor quality combustion

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