Hydraulic Actuator for Precise Valve Timing Control
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Solution Overview
Problem
Conventional camshaft-driven valve mechanisms in piston engines cannot provide precise, real-time adjustment and control of gas exchange valves, limiting engine efficiency, fuel economy, and emission reduction, especially at varying engine loads and speeds.
Innovation Solution
A hydraulic actuator with a control arm and lift mechanism, utilizing a pressure chamber and hydraulic ports to control gas exchange valves, allowing for individual and precise timing adjustments, driven by an external actuator such as an electric solenoid or voice coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a camshaft-driven valve mechanism is used, then the structure is simple and reliable, but the timing adjustment is limited and cannot be precisely controlled in real time
Solution Approach 1:
The patent replaces the traditional mechanical camshaft-driven valve control system with a hydraulic actuator system. The hydraulic actuator uses fluid pressure to move the control arm and lift means, eliminating the need for a camshaft and enabling precise, real-time timing adjustments through hydraulic control. This substitution allows for individual valve timing control while maintaining system reliability.
Solution Approach 2:
The patent employs a hydraulic system where pressurized fluid is directed into a pressure chamber to move the control arm and lift means. The hydraulic medium transmits force efficiently, allowing for precise control of valve timing and individual valve adjustment. The hydraulic approach provides smooth, controllable motion that is difficult to achieve with purely mechanical systems.
2Productivity
If individual valve control is implemented, then engine efficiency and emission reduction improve, but the device complexity increases
Solution Approach 1:
The patent divides the valve control system into individual actuators for each valve or valve train, allowing independent control of each valve's timing. This segmentation enables precise adjustment of inlet and outlet valves separately, optimizing engine performance and emissions for different operating conditions while maintaining a modular architecture that manages complexity.
Solution Approach 2:
The patent implements a dynamic valve control system where the hydraulic actuator can adjust valve timing in real-time based on engine operating conditions. The control arm and lift means can move to different positions, changing the timing characteristics of each valve individually. This dynamic adjustment capability optimizes engine efficiency and emissions across varying loads and speeds.
3Adaptability or versatility
If a compact actuator design is used, then adaptability improves, but the hydraulic components may become crowded
Solution Approach 1:
The patent employs a nested arrangement where the control arm is positioned within or alongside the lift means, and hydraulic components are integrated into the actuator body. The control arm rotates within the actuator housing, and the lift means moves within the same compact space. This nesting allows all hydraulic components to fit within a small volume while maintaining full functionality and adaptability.
Solution Approach 2:
The patent combines multiple functions into a single integrated actuator unit. The control arm, lift means, pressure chamber, and hydraulic ports are all merged into one compact assembly. This integration eliminates the need for separate components and reduces overall complexity while maintaining adaptability for different engine configurations.
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
Enables accurate and individual control of gas exchange valves, improving engine efficiency, fuel economy, and reducing emissions by allowing for flexible timing adjustments, while maintaining a compact and adaptable design.
Implementation Method 1
The body encloses a pressure chamber delimited by the piston surface of the lift means. The movement of the control arm provides a flow connection between the inlet port and the pressure chamber in order to move the lift means
Data Source
AI summary
A hydraulic actuator (1) comprising a body (2), in which a control arm (5) and a lift means (6) provided with a piston surface (22) are arranged, which lift means is arranged to follow the reference movement of the control arm (5), and an inlet port (3) and an outlet port (4) for hydraulic medium. The body (2) encloses a pressure chamber (10) delimited by the piston surface (22) of the lift means (6), and the movement of the control arm (5) provides a flow connection between the inlet port (3) and the pressure chamber (10) in order to move the lift means (6), and the movement of the control arm (5) in the opposite direction provides a flow connection between the pressure chamber (10) and the outlet port (4) in order to move the lift means (6) in the opposite direction.