Rotation Shaft Valve for Variable Valve Control
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Solution Overview
Problem
The complexity and cost of oil control circuits in variable valve control systems increase with the number of engine control modes, leading to packaging difficulties and higher costs, especially in systems requiring multiple oil control valves for various engine operations.
Innovation Solution
A variable valve control system utilizing a single rotation shaft valve to perform multiple oil control valve functions, with an oil control circuit block featuring low-pressure and high-pressure oil lines and oil passages that switch between them, allowing for optimal control of latching pins through a rotation shaft valve and actuator, simplifying the system and reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple oil control valves are used to control different engine control modes, then the system can achieve various engine control modes (1-5) with different valve lift controls, but the oil control circuit becomes complicated and the system cost increases
Solution Approach 1:
The patent applies a single rotation shaft valve that can perform multiple functions by switching between different engine control modes. The rotation shaft valve replaces the need for multiple separate oil control valves, enabling the system to achieve various engine control modes (1-5) with different valve lift controls while maintaining a simplified oil control circuit structure
Solution Approach 2:
The patent merges the functions of multiple oil control valves into a single rotation shaft valve. By combining the control functions for different engine modes into one integrated valve mechanism, the system reduces the number of components and simplifies the oil control circuit while maintaining the ability to perform various engine control operations
2Adaptability or versatility
If multiple oil control valves are used for different engine control modes, then various valve lift controls can be achieved, but the system cost and packaging difficulty increase
Solution Approach 1:
The rotation shaft valve is designed as a universal component that can control different valve lift configurations for various engine control modes. This multi-functional valve reduces the total number of components needed, thereby lowering manufacturing costs and simplifying packaging requirements while maintaining comprehensive valve lift control capabilities
Solution Approach 2:
By merging multiple oil control valve functions into a single rotation shaft valve, the system reduces component count and assembly complexity. This consolidation directly lowers system cost and eases packaging difficulties while preserving the ability to implement different valve lift controls for various engine modes
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
This configuration simplifies the system, reduces costs, and improves fuel efficiency by enabling selective application of variable valve lift and cylinder deactivation across different engine load regions and driving conditions, enhancing marketability through optimized valve control.
Implementation Method 1
a variable valve mechanism having latching pins for performing variable valve lift by a pressure difference of oil
Implementation Method 2
an actuator that generates rotary power for switching of the rotation shaft valve
Implementation Method 3
the low-pressure oil line may be provided with a relief valve configured to lower an increase of pressure in the low-pressure oil line using a drain hole
Implementation Method 4
the oil control hole may be formed to fluidically-communicate with the shaft hole while forming a phase angle difference of 90° with the oil groove, and the low-pressure oil may be supplied to the control gallery through the oil groove
Data Source
AI summary
A variable valve control system may include a variable valve mechanism having latching pins for performing variable valve lift by a pressure difference of oil, an oil control circuit block having a low-pressure oil line and a high-pressure oil line to control ON/OFF of the latching pins, and a rotation shaft valve having oil passages for switching the low-pressure oil line and the high-pressure oil line.