Linear Motor Valve Actuator for Variable Timing Control
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Solution Overview
Problem
Current valve actuation systems in internal combustion engines are complex, costly, and inefficient, with fixed valve timing, lift, and duration, which limits engine performance and increases weight, while existing solutions either add complexity or suffer from mechanical damage due to slamming issues.
Innovation Solution
A linear motor actuation system that uses multiple moving coils with fixed magnets to variably control valve movement, allowing independent control of valve opening time, lift, and velocity, with electronic control unit feedback for precise operation, reducing weight and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical camshafts are used to actuate valves, then valve timing and lift are fixed and reliable, but device complexity increases and adaptability decreases
Solution Approach 1:
The patent replaces the mechanical camshaft system with an electromagnetic actuator system. The electromagnetic actuator uses magnetic fields generated by coils to directly actuate the valve, eliminating the need for mechanical cam profiles, rocker arms, and associated mechanical linkages. This substitution reduces mechanical complexity while enabling variable valve timing and lift control through electronic means.
Solution Approach 2:
The patent implements variable valve timing and lift capabilities by making the valve actuation system dynamically adjustable. The electromagnetic actuator can change its operating parameters (coil current, pulse duration, timing) in real-time based on engine conditions, allowing the valve timing and lift to be optimized across different operating ranges rather than being fixed by mechanical cam profiles.
2Adaptability or versatility
If camshaft phasing mechanisms are added to adjust valve timing, then adaptability improves, but device complexity and manufacturing precision requirements increase
Solution Approach 1:
The patent eliminates mechanical phasing mechanisms by using an electromagnetic actuator that can independently control valve timing through electronic signals. Instead of mechanically advancing or retarding camshaft position, the system directly controls when the electromagnetic force is applied to actuate the valve, achieving timing adjustment without any mechanical phasing components.
Solution Approach 2:
The patent achieves variable valve timing by changing the temporal parameters of the electromagnetic actuation signal. By adjusting the timing of coil energization, pulse width, and current magnitude, the system can optimize valve timing for different operating conditions without requiring mechanical adjustment mechanisms.
3Adaptability or versatility
If multiple camshafts are used to optimize low and high speed operation, then adaptability improves, but device complexity and cost increase
Solution Approach 1:
The patent makes the electromagnetic actuator multi-functional by enabling it to optimize valve actuation across the entire engine speed range through electronic control. A single electromagnetic actuator can adjust its timing, duration, and force characteristics to suit different operating conditions, replacing the need for separate camshafts designed for specific speed ranges.
Solution Approach 2:
The electromagnetic actuator provides dynamic adaptability across all engine speeds by allowing real-time adjustment of actuation parameters. The system can optimize valve timing and lift for low-speed torque production, mid-range efficiency, and high-speed power output using the same physical actuator, eliminating the need for multiple specialized camshafts.
4Adaptability or versatility
If hydraulic phasing systems are used to adjust camshaft position, then adaptability improves, but manufacturing precision and fluid viscosity requirements increase
Solution Approach 1:
The patent replaces hydraulic phasing systems with direct electromagnetic actuation. Instead of using hydraulic pressure to mechanically advance or retard camshaft position, the system uses electromagnetic forces to directly actuate the valve, eliminating the need for hydraulic fluid, pumps, and precision-machined hydraulic components.
Solution Approach 2:
The patent extracts and removes the hydraulic phasing subsystem entirely. By using electromagnetic actuators that directly actuate the valves, the system eliminates the need for hydraulic fluid circulation, pressure control mechanisms, and the precise mechanical interfaces required for hydraulic cam phasing.
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 provides high accuracy and speed in valve control, eliminating mechanical drawbacks, increasing reliability, and optimizing engine performance across a range of speeds with reduced packaging and cost.
Implementation Method 1
a linear motor with multiple moving coils attached to the valve stem with multiple fixed magnets that ride inside the coils
Data Source
AI summary
A linear motor actuated valve assembly in which a linear motor enables electrical actuation and control of intake and exhaust valves of an internal combustion engine.