Exhaust Gas Recirculating Apparatus With Offset Introduction Passages
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Solution Overview
Problem
Existing exhaust gas recirculating apparatuses for internal combustion engines face variations in exhaust gas introduction due to intake pulsations and delayed intake valve closure, leading to reduced exhaust gas delivery across cylinders.
Innovation Solution
An exhaust gas recirculating apparatus with an inter-cylinder distributing portion and strategically positioned introduction passages that maximize offset distances between centerlines, preventing fresh air backflow and maintaining consistent exhaust gas distribution across intake passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If introduction passages are arranged close to the exhaust gas distributing portion, then the structure is compact and easy to manufacture, but fresh air may blow back from one intake passage to another through the introduction passages, causing variation in exhaust gas introduction amount among cylinders
Solution Approach 1:
The patent offsets the introduction passages in the second direction (width direction of the intake manifold) so that the distance between center lines of adjacent introduction passages is greater than the distance between center lines of adjacent intake passages. This dimensional offset arrangement prevents fresh air from one intake passage from reaching another introduction passage, thereby eliminating the backflow problem while maintaining a compact structure.
2Device complexity
If introduction passages are arranged on the side surfaces of intake passages, then the configuration is simple, but intake pulsations and delayed valve closure cause fresh air to blow back through introduction passages, reducing exhaust gas delivery
Solution Approach 1:
Instead of arranging introduction passages directly on the side surfaces of intake passages, the patent offsets them in the width direction (second direction) of the intake manifold. This dimensional separation ensures that even when fresh air blows back due to intake pulsations or delayed valve closure, it cannot reach adjacent introduction passages, thereby maintaining consistent exhaust gas delivery across all cylinders.
3Volume of moving object
If the distance between introduction passages is small, then the exhaust gas recirculating apparatus is compact, but fresh air can flow between adjacent introduction passages, varying exhaust gas introduction among cylinders
Solution Approach 1:
The patent achieves compactness by strategically offsetting introduction passages in the width direction (second direction) rather than increasing the overall apparatus volume. By positioning the introduction passages such that the distance between their center lines exceeds the distance between adjacent intake passage center lines, the design prevents fresh air interference between cylinders while maintaining a space-efficient compact structure.
Data Source
AI summary
An exhaust gas recirculating apparatus is arranged in an intake manifold. The intake passages are aligned in a first direction. The apparatus has an inter-cylinder exhaust gas distributing portion, a first introduction passage, and a second introduction passage. The direction in which the intake passages are aligned is referred to as a second direction. The first introduction passage is arranged at such a position that the center line of the first introduction passage in the second direction is offset from the center line of the first intake passage in the second direction to be away from the second intake passage. The second introduction passage is arranged at such a position that the center line of the second introduction passage in the second direction is offset from the center line of the second intake passage in the second direction to be away from the first intake passage.