Oil Control Valve Hydraulic Pressure Stability
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Solution Overview
Problem
The hydraulic type variable valve lift system faces challenges in maintaining constant hydraulic pressure in the line connecting the oil control valve and the valve lift control actuator, leading to unreliable control of valve lift according to engine speed and load.
Innovation Solution
An oil control valve design featuring a valve housing with a control port and drain port, a ball valve, check valve, and a pilot mechanism, along with a pressing spring to maintain residual pressure and ensure stable hydraulic pressure, allowing reliable control of valve lift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydraulic type variable valve lift system is used to control valve lift, then valve deflection can be adjusted according to engine speed and load, but constant hydraulic pressure cannot be maintained in the hydraulic line, leading to unreliable control
Solution Approach 1:
A check valve is introduced as an intermediary component in the hydraulic line between the oil control valve and the actuator. This check valve maintains residual pressure by preventing backflow, ensuring stable hydraulic pressure delivery to the actuator while allowing the system to adapt valve lift according to engine conditions.
Solution Approach 2:
The system changes the hydraulic pressure parameter by maintaining residual pressure in the hydraulic line through the check valve mechanism. This ensures that the pressure parameter remains stable and reliable for actuator operation, while the oil control valve adjusts other parameters like flow rate to achieve variable valve lift control.
2Power
If high valve lift is used at high engine speed to increase air intake, then power output improves, but at low engine speed high valve lift reduces flow speed and vortex formation, decreasing inhalation efficiency
Solution Approach 1:
The variable valve lift system dynamically adjusts valve deflection based on engine operating conditions. At high engine speeds, the valve operates at high lift to maximize air intake and power output. At low engine speeds, the valve operates at low lift to maintain optimal flow speed and vortex formation, ensuring efficient combustion across all operating ranges.
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 design maintains constant hydraulic pressure, enabling reliable control of valve lift based on engine speed and load, enhancing the efficiency and reliability of the variable valve lift system.
Implementation Method 1
a pressing spring, which is installed on an upper portion of the pilot and configured to elastically push the check valve such that an upper portion of the check valve seals the second through-hole
Implementation Method 2
a ball valve installed to be able to move up and down in a first chamber formed by the valve cap and the upper seat, with the ball valve configured to open and close the first through-hole
Implementation Method 3
a check valve, which is installed to be able to move up and down below the lower seat, and which has an upper portion protruding convexly so as to open and close the second through-hole
Data Source
AI summary
The present invention relates to an oil control valve for a variable valve lift system that obtains in a stable manner a constant hydraulic pressure in the hydraulic line connecting the oil control valve and the vale lift control actuator, and thereby reliably controls valve lift according to the number of revolutions and load of the engine.