Valve Assembly Overstroke Device Reduces Current Draw
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Solution Overview
Problem
Existing valve assemblies in engine exhaust systems face inefficiencies in power consumption and actuator lifespan due to high electrical current draw during operation.
Innovation Solution
A valve assembly comprising a rotatable valve, an electrically operated actuator, and an overstroke device that allows the actuator to move beyond its initial position while maintaining the valve's operational position, reducing electrical current draw and enhancing actuator longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuator continuously maintains electrical power to hold the valve in position, then the valve position is maintained reliably, but the electrical current draw increases power consumption and reduces actuator lifespan
Solution Approach 1:
The system uses periodic action by switching from continuous power consumption to intermittent power consumption. The overstroke device allows the actuator to be de-energized after reaching the target position, and the spring mechanism maintains the valve position without continuous electrical power, thereby reducing overall current draw while maintaining reliability
Solution Approach 2:
The spring-loaded overstroke device provides self-service by automatically maintaining the valve in the desired position without requiring continuous external energy input. Once the actuator moves the valve to the target position, the spring mechanism sustains this position passively, eliminating the need for continuous electrical power to hold the position
2Reliability
If the actuator operates continuously to maintain valve position against backpressure, then the valve remains controlled, but the actuator experiences increased wear and reduced useful life
Solution Approach 1:
The actuator operates periodically rather than continuously. It activates only when valve position adjustment is needed, moves the valve to the desired position, and then remains de-energized while the spring mechanism maintains the position. This periodic operation significantly reduces actuator wear and extends its operational lifespan
Solution Approach 2:
The spring-loaded overstroke device takes over the function of maintaining valve position, allowing the actuator to serve itself by only performing the active adjustment function. This division of labor reduces the actuator's workload and extends its service life
3Measurement precision
If the component is restricted to move only to the exact actuator position, then precise control is achieved, but the actuator cannot reduce current draw by overstroking
Solution Approach 1:
The movement range of the component is segmented into two distinct zones: the valve actuation zone where precise valve control occurs, and the overstroke zone where the component can travel further without affecting the valve position. This segmentation allows the system to achieve precise valve control while enabling the actuator to overstroke and reduce power consumption
Solution Approach 2:
The spring-loaded overstroke device acts as an intermediary between the actuator and the valve. It absorbs the excess movement beyond the actuator position while maintaining the valve at its precise target position, thereby decoupling the actuator's movement range from the valve's positioning requirements
Data Source
AI summary
A valve assembly comprises a rotatable valve, an electrically operated actuator, and an overstroke device. The actuator comprises a component configured to move in a direction to an actuator position so as to cause corresponding rotation of the valve to a valve position in response to electrical operation of the actuator. The overstroke device is configured to enable the component to move in the direction beyond the actuator position to an overstroke position while the valve remains in the valve position in response to electrical operation of the actuator.