Variable valve mechanism and reciprocating piston internal combustion engine

Abstract

The invention relates to a variable valve mechanism and a reciprocating piston type internal combustion engine. The variable valve mechanism comprises a slide bar (3) and an actuation assembly for actuating the slide bar (3) in the longitudinal direction. The slide bar (3) is mounted so as to be movable in the longitudinal direction on a component of the reciprocating piston internal combustion engine, and wherein a coupling element (53) of at least one switchable rocker arm (5) of the variable valve mechanism can be actuated in the axial direction by means of the longitudinal movement of the slide bar (3), such that the switchable rocker arm (5) can provide different cam lifts. The actuation assembly comprises: an electric motor (1) comprising an output shaft; a cam member (2) which is mounted on the output shaft in a rotationally fixed manner and which can abut against the slide bar (3) such that a rotational movement of the cam member (2) is converted into a longitudinal movement of the slide bar (3). The reciprocating piston type internal combustion engine comprises the variable valve mechanism.

Description

technical field [0001] The present invention relates to the technical field of vehicles. The present invention particularly relates to a variable valve train for a reciprocating piston type internal combustion engine and a reciprocating piston type internal combustion engine. Background technique [0002] Currently, variable valve technology can be used to adjust the intake and / or exhaust of the cylinders of a reciprocating piston internal combustion engine according to the driving mode of the vehicle, thereby optimizing the fuel efficiency of the internal combustion engine, especially for reducing carbon dioxide and harmful emissions. [0003] In a known variable valve solution for a reciprocating piston internal combustion engine, each cylinder of the internal combustion engine is equipped with at least one gas exchange valve, the valve stroke of which is respectively provided by a cam of a camshaft and a variable valve cooperating with the cam. Switch rocker arm OK. Suc...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned hydraulic or pneumatic adjustment cylinder scheme, it is necessary to set up a corresponding pressure medium passage for the adjustment cylinder, so the overall structure of the variable valve mechanism is relatively complicated.

However, in the current scheme of driving the slide bar through an electric actuator, it is necessary to provide a stable input current to the electric actuator. For this reason, it is necessary to provide a current closed-loop channel for the motor control unit of the electric actuator, but the current mainstream The motor control unit has no additional resources to provide a current closed-loop channel for the variable valve train

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