Variable Valve Mechanism Cylinder Deactivation
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Solution Overview
Problem
The existing variable valve mechanism group cannot individually control or deactivate a predetermined cylinder, which is necessary for improved fuel economy and engine performance.
Innovation Solution
A variable valve mechanism configuration that includes an input member and an output member swingably disposed on the same axis, a slider engaging with these members, and a displacement device that allows the slider to be displaced in one direction to increase valve lift and in another direction to reduce it, enabling the mechanism to be placed in a variable or lift retaining state, allowing only a predetermined cylinder to be deactivated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the displacement device displaces all sliders simultaneously in the axial direction, then the valve lift can be uniformly increased or reduced, but individual cylinder deactivation becomes impossible
Solution Approach 1:
The patent divides the single displacement device into multiple independent displacement devices, one for each slider. This segmentation allows each slider to be displaced independently in the axial direction, enabling individual cylinder deactivation while maintaining the capability for uniform displacement when all displacement devices are activated together.
2Adaptability or versatility
If the slider is displaced in the axial direction to change valve lift, then the relative displacement between slider and input/output members occurs, but simultaneous displacement of all components prevents lift retention
Solution Approach 1:
The patent introduces a dynamic switching mechanism that can change the displacement characteristics of the input member and output member relative to the slider. By controlling whether these members are displaced together with the slider or remain stationary, the system can dynamically switch between variable state (for lift adjustment) and lift retaining state (for stable operation), ensuring both adaptability and reliability.
Data Source
AI summary
In a variable valve mechanism of an internal combustion engine, when a slider is displaced relative to an input member and an output member in an axial direction, the output member turns relative to the input member in a swing direction, whereby a lift of a valve is increased or reduced. The variable valve mechanism is brought into a lift retaining state when the slider is placed in an idle running range located on a reducing direction side with respect to a boundary position. The lift retaining state is a state where when the slider is displaced in the axial direction, the input member and the output member are displaced together with the slider in the axial direction, so that the relative displacement of the slider and the relative turning of the output member do not occur and the lift of the valve is retained.