EGR Valve Device Non-Linear Interlocking Control
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Solution Overview
Problem
Existing valve devices with gear link mechanisms have limited flexibility in setting the relationship between the opening degrees of passages, restricting the ability to efficiently control the flow rate of EGR gas.
Innovation Solution
A valve device with a housing, a bypass valve body, an EGR valve body, and an interlocking portion that allows the EGR valve body to rotate and control the downstream passage, while the interlocking portion sets a non-linear relationship between the opening degrees of the second upstream and downstream passages, enabling flexible control of EGR gas flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a gear link mechanism is used to interlock valve bodies, then the valve device can control multiple passages, but the flexibility in setting the relationship between opening degrees is limited
Solution Approach 1:
The valve device is divided into independent valve bodies (first and second valve bodies) that can be controlled separately. Each valve body has its own actuation mechanism, allowing independent control of opening degrees for different passages. This segmentation enables flexible setting of opening degree relationships without being constrained by a rigid gear link mechanism.
Solution Approach 2:
The valve device employs dynamic control mechanisms that allow the opening degrees of different valve bodies to be adjusted independently in real-time. The control system can dynamically set the relationship between opening degrees based on operational requirements, transforming the static gear link constraint into a dynamic, adaptable control system.
2Productivity
If the EGR valve body rotates to control the downstream passage, then the flow rate can be adjusted, but the bypass flow rate is influenced by the rotation direction
Solution Approach 1:
The control system is segmented into independent control mechanisms for the downstream passage and the bypass passage. The first valve body controls the downstream passage while the second valve body controls the bypass passage independently. This segmentation allows the bypass flow rate to be stabilized independently of the EGR valve rotation direction, as the bypass valve can compensate for any variations.
Solution Approach 2:
The control system incorporates feedback mechanisms that monitor the bypass flow rate and adjust the second valve body's opening degree in response to changes caused by EGR valve rotation. This feedback loop ensures that the bypass flow rate remains stable regardless of the rotation direction of the EGR valve body, maintaining reliability while allowing flexible flow rate control.
Data Source
AI summary
A valve device increases or decreases a flow rate of EGR gas. The valve device includes a housing, a bypass valve body, and an EGR valve body. The housing includes a first upstream passage into which the EGR gas cooled by an EGR cooler flows, a second upstream passage into which the EGR gas that bypasses the EGR cooler flows, and a downstream passage connected to the first upstream passage and the second upstream passage, and provided downstream with respect to the first upstream passage and the second upstream passage. The bypass valve body opens and closes the second upstream passage. The EGR valve body is provided in the downstream passage and rotates around an EGR valve axis to open and close the downstream passage.