Five-Position Hydraulic Valve for Cam Phaser Cold Oil Control
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Solution Overview
Problem
Existing cam phaser systems face challenges in achieving a simple, compact configuration with improved cold operating properties and efficient torque utilization, particularly in managing alternating and surging torques to enhance engine speed adjustment and fluid flow control.
Innovation Solution
A hydraulic valve with a bushing and piston assembly that includes check valves, annular bars, and groove-shaped recesses, allowing for five switching positions to control fluid flow between operating connections, supply, and tank drain connections, enabling efficient torque management and fluid routing based on pressure thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If check valves are integrated into the central valve with band check valves pressing from inside against the bushing, then alternating cam shaft torques can be utilized, but the device complexity increases
Solution Approach 1:
The patent combines multiple check valve functions into a single integrated valve body. The central valve integrates both the main control function and the check valve functions for utilizing alternating cam shaft torques, eliminating the need for separate band check valves and reducing overall device complexity while maintaining torque utilization capability
2Reliability
If multiple switching positions are implemented for fluid flow control, then cold operating properties improve, but the device complexity increases
Solution Approach 1:
The patent implements a dynamically adjustable valve structure where the piston can assume multiple switching positions (first, second, third, fourth, and fifth positions) along the longitudinal axis. This dynamic positioning enables the valve to adapt fluid flow paths based on operating conditions, particularly improving cold operating properties by optimizing fluid circulation and pressure distribution across different temperature and load scenarios
3Stability of the object's composition
If the piston is positioned in the center position, then fluid connections are interrupted for stable operation, but adjustment speed decreases
Solution Approach 1:
The patent employs periodic switching between different piston positions to achieve both stability and speed. The valve alternates between center position (for stable operation with interrupted connections) and end positions (for rapid fluid flow and adjustment). This periodic action between different operational states allows the system to maintain stability during holding phases while achieving high adjustment speeds during transition phases
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 solution provides improved adjustment speed, especially in higher engine speed ranges and lower temperature conditions, while maintaining stable operation and efficient oil exchange, even with viscous cold oil, by selectively utilizing torques and optimizing fluid flow paths.
Implementation Method 1
a fluid path from the first operating connection to the second operating connection is openable by the check valve that is associated with the first operating connection under a pressure that exceeds a threshold value
Data Source
AI summary
A hydraulic valve for a cam phaser, the hydraulic valve including a bushing including a piston that is movable in a bore along a longitudinal direction; a supply connection configured to feed a hydraulic fluid; a first operating connection and a second operation connection; and a first tank drain connection and a second tank drain connection configured to drain the hydraulic fluid; and a first check valve associated with the first operating connection and a second check valve associated with the second operating connection, wherein the first operating connection and the second operating connection are connectable through at least one of the first check valve and the second check valve alternatively with each other or with the supply connection or with one of the first tank drain connection and the second tank drain connection by moving the piston, wherein the hydraulic valve includes five switching positions.