Variable Valve System Cylinder Deactivation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing variable valve lift systems face issues with secure spark formation and cylinder bore transformation when cylinder deactivation portions continuously operate, leading to inefficiencies in fuel efficiency and exhaust gas reduction.
Innovation Solution
A variable valve system that includes a variable valve lifter for adjusting valve lift amounts, a variable valve timing mechanism for controlling valve opening and closing timing, and a cylinder deactivation portion that alternates lift amounts between valves, using control shafts and motors to manage hydraulic pressure and prevent spark plug fouling and bore transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the cylinder deactivation portion continuously operates in a particular cylinder, then fuel efficiency is improved, but spark formation becomes insecure and cylinder bore transformation occurs
Solution Approach 1:
The system implements periodic alternation of cylinder deactivation between different cylinders. The control unit switches which cylinders are deactivated in a periodic manner, ensuring that no single cylinder remains continuously deactivated. This periodic action maintains spark formation security while achieving fuel efficiency benefits during deactivation periods.
2Use of energy by moving object
If the cylinder deactivation portion continuously operates in a particular cylinder, then fuel efficiency is improved, but cylinder bore transformation occurs
Solution Approach 1:
The system alternates cylinder deactivation periodically between different cylinders, preventing continuous deactivation in any single cylinder. This periodic switching maintains bore stability by ensuring all cylinders periodically undergo normal combustion cycles, while still achieving fuel efficiency improvements during deactivation periods.
3Productivity
If the variable valve lifter adjusts valve lift amounts, then engine performance is optimized, but device complexity increases
Solution Approach 1:
The variable valve lifter mechanism serves multiple functions: it controls valve lift amounts for performance optimization, works in conjunction with the variable valve timing portion for comprehensive valve control, and integrates with the cylinder deactivation system. This multi-functionality reduces the need for separate dedicated mechanisms for each function.
Solution Approach 2:
The patent combines the variable valve lifter, variable valve timing portion, and cylinder deactivation portion into an integrated valve control system. These components work together through shared control logic and coordinated operation, merging what could have been separate systems into a unified approach that optimizes engine performance while managing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively alternates cylinder deactivation modes to prevent spark plug fouling and bore transformation, enhancing fuel efficiency and reducing exhaust gas emissions by adjusting valve lift amounts and timing, while maintaining efficient engine operation across varying engine speeds.
Implementation Method 1
One hydraulic pressure line is provided for the cylinder deactivation portions and another hydraulic pressure line is provided for the variable valve timing portions
Data Source
AI summary
A variable valve system includes a variable valve lifter for changing a first lift amount of one or more valves at a predetermined engine speed; a variable valve timing portion for controlling opening and closing timing of one or more valves; and a cylinder deactivation portion that changes a second lift amount of two or more valves in an alternating pattern.