Orthogonal Exhaust Catalyst Layout for Compact Engine Compartment
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Solution Overview
Problem
In work vehicles, parallel arrangement of post-processing devices like diesel particulate collecting filters and nitrogen oxide reduction catalysts can lead to an uneven engine compartment dimension, resulting in a wider right and left width due to the longer device dimension determining the compartment size.
Innovation Solution
The exhaust gas purifying device is arranged with a cylindrical oxidation catalyst, reducing agent injection device, and selective catalytic reduction device, where the oxidation catalyst's central axis is oriented along the right and left direction, the reducing agent injection device's central axis along the front and rear direction, and the selective catalytic reduction device's central axis aligned with the oxidation catalyst, allowing for a compact arrangement that shortens the right and left width of the engine compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If post-processing devices are arranged in parallel with one device's longitudinal length determining the engine compartment width, then the exhaust gas purification function is achieved, but the right and left width of the engine compartment becomes larger
Solution Approach 1:
The patent transitions from a parallel arrangement (both devices extending in the same dimension) to an orthogonal arrangement where the first post-processing device extends in the right-left direction and the second post-processing device extends in the front-rear direction. This dimensional change allows both devices to coexist without one determining the overall compartment width, thus reducing the engine compartment width while maintaining both purification functions
Solution Approach 2:
The patent positions the second post-processing device such that its longitudinal direction overlaps with the first post-processing device when viewed from above, creating a nested spatial relationship. The selective catalytic reduction device is arranged to pass through the oxidation catalyst device's projection area, allowing compact integration of both devices within the engine compartment without increasing overall width
2Ease of manufacture
If the engine compartment width is increased to accommodate parallel post-processing devices, then both devices can be installed, but the vehicle overall width increases
Solution Approach 1:
By arranging the second post-processing device in the front-rear direction rather than parallel to the first device's right-left orientation, the patent utilizes the longitudinal space of the engine compartment more efficiently. This allows both devices to be installed without increasing the vehicle's right-left width, as the devices are stacked orthogonally rather than placed side-by-side
Solution Approach 2:
The patent provides flexibility in the relative positioning of the two post-processing devices along their respective axes, allowing optimization of the arrangement to fit within the engine compartment's dimensional constraints while maintaining both devices' functional requirements
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
This configuration effectively reduces the right and left width of the engine compartment, improves maintenance accessibility, and enhances backward visibility from the operator cab by optimizing the layout and positioning of the exhaust gas purifying components.
Implementation Method 1
a cylindrical oxidation catalyst device (410)... for purifying exhaust gas of the engine
Implementation Method 2
a cylindrical selective catalytic reduction device (430)... for reducing nitrogen oxide
Data Source
AI summary
An oxidation catalyst device is placed so that a central axis of the oxidation catalyst device may be oriented along a right and left direction of a work vehicle; a reducing agent injection device is placed so that a central axis of the reducing agent injection device may be oriented along a front and rear direction of the work vehicle; and a selective catalytic reduction device is placed so that a central axis of the selective catalytic reduction device may be oriented along the front and rear direction of the work vehicle, in which the oxidation catalyst device, the reducing agent injection device, and the selective catalytic reduction device are arranged so as to have a relationship that the central axes thereof become the same in height, and the central axis of the selective catalytic reduction device is placed so as to pass through the oxidation catalyst device.