Continuously Variable Valve Lift Actuator Pumping Loss
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Solution Overview
Problem
Existing continuously variable valve lift actuators for engines increase pumping loss due to air suction during intake strokes and require complex control operations, leading to reduced productivity and fuel efficiency, especially when valve clearance control fails, necessitating replacement.
Innovation Solution
A continuously variable valve lift actuator with a four-bar link structure that adjusts rotating angles of rocker and lift arms to control intake air based on vehicle operational states, incorporating deviation control mechanisms and return springs to precisely manage valve lift and reduce pumping loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a continuously variable valve lift actuator is applied to control valve lift, then fuel efficiency and engine performance are improved, but pumping loss increases due to air suction during intake stroke
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the valve lift amount through a deviation control mechanism during manufacturing. This allows the valve clearance to be optimized before installation, enabling the actuator to control air intake more precisely during operation and reduce pumping loss without requiring post-installation adjustments that could compromise reliability.
Solution Approach 2:
The patent utilizes parameter changes by varying the valve lift amount continuously based on engine operating conditions. The deviation control mechanism allows adjustment of the valve lift parameter within a predetermined range, enabling optimization of air intake control to minimize pumping loss while maintaining reliable valve clearance across different operational states.
2Productivity
If valve clearance control is performed after mounting the actuator in the engine, then assembly flexibility is maintained, but productivity decreases and product quality is degraded when control fails
Solution Approach 1:
The patent implements preliminary action by incorporating a deviation control mechanism that enables valve clearance adjustment during the manufacturing process before engine assembly. This preliminary adjustment ensures optimal valve clearance is achieved during fabrication, eliminating the need for complex post-installation control operations and improving both productivity and manufacturing ease.
Solution Approach 2:
The patent applies the taking out principle by extracting the valve clearance control function from the post-assembly stage and integrating it into the manufacturing process. The deviation control mechanism allows the valve lift amount to be optimized during fabrication, separating the control operation from the final assembly step and thereby simplifying the manufacturing process and improving productivity.
3Loss of energy
If the valve lift amount is increased to improve air intake control, then fuel efficiency improves, but the risk of valve interference and mechanical conflict increases
Solution Approach 1:
The patent utilizes parameter changes by continuously adjusting the valve lift amount within a predetermined range based on engine operating conditions. The deviation control mechanism enables optimization of the valve lift parameter to improve fuel efficiency while maintaining safe clearance margins that prevent valve interference, achieving a balance between performance and mechanical safety.
Solution Approach 2:
The patent applies dynamics by making the valve lift amount adjustable and adaptive rather than fixed. The deviation control mechanism allows the valve lift to be dynamically optimized based on real-time engine conditions, enabling the system to achieve high fuel efficiency when conditions permit while automatically reducing lift to prevent valve interference when mechanical constraints are approached.
Data Source
AI summary
Disclosed is a continuously variable valve lift actuator of an engine. The continuously variable valve lift actuator of an engine changes rotating angles of a rocker arm and a lift arm having a four-bar link structure to control an intake amount of air of an intake valve based on a running state of a vehicle, and adjusts a location and a length of a link bar by taking into consideration a rotating direction of a cam shaft and interference according to layout of the engine to advance an open time of a valve. The continuously variable valve lift actuator of an engine can reduce pumping loss by controlling an intake amount of air by changing an elevating distance of a valve according to a running state of a vehicle, and the fuel efficiency and the efficiency of the engine can be improved by advancing the open time of the valve.